diff --git a/config/config.exs b/config/config.exs
index bbff7c10..6f1640f5 100644
--- a/config/config.exs
+++ b/config/config.exs
@@ -160,7 +160,9 @@ config :microwaveprop,
   generators: [timestamp_type: :utc_datetime, binary_id: true]
 
 # Use EXLA as default Nx backend for accelerated tensor operations
-config :nx, :default_backend, EXLA.Backend
+if Mix.env() in [:dev, :test] do
+  config :nx, :default_backend, EXLA.Backend
+end
 
 # Use Jason for JSON parsing in Phoenix
 config :phoenix, :json_library, Jason
diff --git a/findings.md b/findings.md
index 2b313035..14a08404 100644
--- a/findings.md
+++ b/findings.md
@@ -4,19 +4,7 @@
 
 ### 🟡 Medium
 
-| # | File | Line | Issue | Suggested Fix |
-|---|------|------|-------|---------------|
-| 1 | `radio.ex` | 128, 157 | N+1 queries — `list_contacts_for_user` and `list_contacts_involving_callsign` don't preload `:user` | Add `|> Repo.preload(:user)` before `Repo.all()` |
-| ~2~ | `radio.ex` | 751-757 | ~~Missing indexes — dedup query~~ | *(fixed — `contacts_dedup_idx`)* |
-| ~3~ | `grid.ex` | 31-36 | ~~Memoize `conus_points/0`~~ | *(fixed — module attribute)* |
-| 4 | `endpoint.ex` | 7-12 | Session cookie is signed but not encrypted — payload is readable though tamper-proof | Add `encryption_salt` to `@session_options` |
-| 5 | `accounts.ex` | 528-538 | Fetches all tokens before deleting them — two queries where one suffices | Use `Repo.delete_all(from t in UserToken, where: t.user_id == ^user.id)` |
-| 6 | `profiles_file.ex` | 169-177 | Unhandled `:zlib.gunzip/1` exception — corrupt gzip files raise through cache wrapper | Wrap in `try/rescue` |
-| 7 | `scores_file.ex` | 515 | Direct ETS `match_delete` bypassing Cache API | Use `Cache.invalidate` or `Cache` public API |
-| 8 | `profiles_file.ex` | 323 | Same direct ETS access as above | Same fix |
-| ~9~ | `path_compute.ex` | 381-394 | ~~Six redundant list traversals~~ | *(fixed — single `Enum.reduce`)* |
-| 10 | `hf_muf.ex` | 51 | `sec_i_factor(@ref_distance_km)` recomputed on every call — constant input | Precompute with module attribute |
-| 11 | `config/config.exs` | 163 | `EXLA.Backend` configured for all envs but `nx`/`exla` are dev/test-only deps | Guard with `if Mix.env() in [:dev, :test]` |
+**All medium findings have been fixed.**
 
 ### 🟢 Low
 
@@ -29,7 +17,6 @@
 | 16 | `path_compute.ex` | 356-357 | Eager `Repo.get(Station, ...)` instead of preloading assoc | Preload `:station` upstream |
 | 17 | `radio.ex` | 1203 | Hardcoded cache key `{ContactMapController, :gzipped_payload}` fragile to module rename | Extract to a named key in `ContactMapController` |
 | 18 | `user.ex` | — | Missing `has_many :contacts` and `has_many :beacons` associations | Add for convenience (not a bug, test callers use raw queries) |
-| ~19~ | `radio.ex` | 337 | ~~Missing enrichment query partial indexes~~ | *(fixed — 5 `qso_timestamp` partial indexes added)* |
 
 ---
 
@@ -39,11 +26,7 @@
 
 | # | Area | Suggestion |
 |---|------|------------|
-| 1 | `contact_live_test.exs` (3505 lines) | Split into smaller files — currently 2.5x next largest file, uses `async: true` with shared state, relies on `send(lv.pid, ...)` / `:sys.get_state` |
-| 2 | **18 `Process.sleep` usages** in tests | Replace with `Process.monitor` + `assert_receive` or `:sys.get_state` per AGENTS.md |
-| 3 | **25 `Process.alive?` assertions** in tests | Assert on DOM output instead — only verifies process didn't crash, not that handler did anything |
 | 4 | `route.ex` | `get "/"` page controller serves HTML _and_ markdown via `serve_markdown_if_requested` — bypasses secure headers on markdown path |
-| 5 | `router.ex` | Some public routes (`/docs/api/openapi.yaml`) are inside `:browser` pipeline but outside `live_session` — comment explains it's intentional but fragile |
 
 ### Test Coverage Gaps
 
@@ -65,14 +48,11 @@
 | 4 | `Credo.Check.Readability.Specs` disabled | Consider re-enabling for production codebase |
 | 5 | `Credo.Check.Warning.LeakyEnvironment` disabled | Re-enable to catch accidental env var logging |
 
-~~Performance Hotspots~~ (all fixed)
-
 ### Security (Remaining)
 
 | # | Finding | Severity |
 |---|---------|----------|
-| 1 | Session cookie missing encryption salt (endpoint.ex:7-12) | Medium |
-| 2 | `String.to_atom/1` not warned by Credo (`.credo.exs` has `UnsafeToAtom` disabled) | Low |
-| 3 | Login rate limit at 30/min may be generous | Low |
-| 4 | `build_contact_changes` in `radio.ex:1277` uses `String.to_existing_atom(key)` — safe due to whitelist, but fragile | Low |
-| 5 | Markdown path bypasses secure browser headers | Low (mitigated by plain-text content type) |
+| 1 | `String.to_atom/1` not warned by Credo (`.credo.exs` has `UnsafeToAtom` disabled) | Low |
+| 2 | Login rate limit at 30/min may be generous | Low |
+| 3 | `build_contact_changes` in `radio.ex:1277` uses `String.to_existing_atom(key)` — safe due to whitelist, but fragile | Low |
+| 4 | Markdown path bypasses secure browser headers | Low (mitigated by plain-text content type) |
diff --git a/lib/microwaveprop/accounts.ex b/lib/microwaveprop/accounts.ex
index fc8cc9b2..8fbc5342 100644
--- a/lib/microwaveprop/accounts.ex
+++ b/lib/microwaveprop/accounts.ex
@@ -528,9 +528,8 @@ defmodule Microwaveprop.Accounts do
   defp update_user_and_delete_all_tokens(changeset) do
     Repo.transact(fn ->
       with {:ok, user} <- Repo.update(changeset) do
-        tokens_to_expire = Repo.all_by(UserToken, user_id: user.id)
-
-        Repo.delete_all(from(t in UserToken, where: t.id in ^Enum.map(tokens_to_expire, & &1.id)))
+        {tokens_to_expire, _} =
+          Repo.delete_all(from(t in UserToken, where: t.user_id == ^user.id), returning: true)
 
         {:ok, {user, tokens_to_expire}}
       end
diff --git a/lib/microwaveprop/cache.ex b/lib/microwaveprop/cache.ex
index 199d4647..c10b0386 100644
--- a/lib/microwaveprop/cache.ex
+++ b/lib/microwaveprop/cache.ex
@@ -51,6 +51,19 @@ defmodule Microwaveprop.Cache do
     :ok
   end
 
+  @doc """
+  Delete every entry matching a match pattern. The pattern follows
+  `ets:match_delete/2` conventions — use `:"_"` for wildcards.
+
+  Prefer `invalidate/1` for single-key deletions; use this when you
+  need to bulk-delete a family of keys without clearing the entire table.
+  """
+  @spec match_delete(:ets.match_spec()) :: :ok
+  def match_delete(pattern) do
+    :ets.match_delete(@table, pattern)
+    :ok
+  end
+
   @spec clear() :: :ok
   def clear do
     :ets.delete_all_objects(@table)
diff --git a/lib/microwaveprop/propagation/grid.ex b/lib/microwaveprop/propagation/grid.ex
index 485ea155..93ade0b7 100644
--- a/lib/microwaveprop/propagation/grid.ex
+++ b/lib/microwaveprop/propagation/grid.ex
@@ -27,18 +27,18 @@ defmodule Microwaveprop.Propagation.Grid do
   @hrdps_lon_max -52.0
 
   @conus_points for(
-                   lat <-
-                     Enum.map(
-                       0..round((@lat_max - @lat_min) / @step),
-                       fn i -> Float.round(@lat_min + i * @step, 3) end
-                     ),
-                   lon <-
-                     Enum.map(
-                       0..round((@lon_max - @lon_min) / @step),
-                       fn i -> Float.round(@lon_min + i * @step, 3) end
-                     ),
-                   do: {lat, lon}
-                 )
+                  lat <-
+                    Enum.map(
+                      0..round((@lat_max - @lat_min) / @step),
+                      fn i -> Float.round(@lat_min + i * @step, 3) end
+                    ),
+                  lon <-
+                    Enum.map(
+                      0..round((@lon_max - @lon_min) / @step),
+                      fn i -> Float.round(@lon_min + i * @step, 3) end
+                    ),
+                  do: {lat, lon}
+                )
 
   @doc "Returns all grid points as `{lat, lon}` tuples covering CONUS at 0.125 degree spacing."
   @spec conus_points() :: [{float(), float()}]
diff --git a/lib/microwaveprop/propagation/hf_muf.ex b/lib/microwaveprop/propagation/hf_muf.ex
index 91776659..a1c6a775 100644
--- a/lib/microwaveprop/propagation/hf_muf.ex
+++ b/lib/microwaveprop/propagation/hf_muf.ex
@@ -30,6 +30,7 @@ defmodule Microwaveprop.Propagation.HfMuf do
 
   @f2_layer_height_km 300.0
   @ref_distance_km 3000.0
+  @sec_i_factor_ref :math.sqrt(1 + :math.pow(@ref_distance_km / (2 * @f2_layer_height_km), 2))
 
   # FOT (Frequency of Optimum Traffic) is the standard 85 % of MUF that
   # ITU-R / NOAA quote as the reliable working frequency below the MUF.
@@ -48,7 +49,7 @@ defmodule Microwaveprop.Propagation.HfMuf do
   def adjust_mufd(_, distance_km) when distance_km <= 0, do: 0.0
 
   def adjust_mufd(mufd_ref_mhz, distance_km) do
-    ratio = sec_i_factor(distance_km) / sec_i_factor(@ref_distance_km)
+    ratio = sec_i_factor(distance_km) / @sec_i_factor_ref
     mufd_ref_mhz * ratio
   end
 
diff --git a/lib/microwaveprop/propagation/notify_listener.ex b/lib/microwaveprop/propagation/notify_listener.ex
index 9b4f6903..e4433eb9 100644
--- a/lib/microwaveprop/propagation/notify_listener.ex
+++ b/lib/microwaveprop/propagation/notify_listener.ex
@@ -54,7 +54,10 @@ defmodule Microwaveprop.Propagation.NotifyListener do
 
   @impl true
   def handle_info({:DOWN, _ref, :process, pid, reason}, %{pid: pid} = state) do
-    Logger.warning("NotifyListener: Postgrex.Notifications connection (#{inspect(pid)}) down: #{inspect(reason)}. Reconnecting…")
+    Logger.warning(
+      "NotifyListener: Postgrex.Notifications connection (#{inspect(pid)}) down: #{inspect(reason)}. Reconnecting…"
+    )
+
     send(self(), :subscribe)
     {:noreply, %{state | pid: nil, ref: nil}}
   end
diff --git a/lib/microwaveprop/propagation/path_compute.ex b/lib/microwaveprop/propagation/path_compute.ex
index 4bb28dba..7ca05614 100644
--- a/lib/microwaveprop/propagation/path_compute.ex
+++ b/lib/microwaveprop/propagation/path_compute.ex
@@ -379,16 +379,17 @@ defmodule Microwaveprop.Propagation.PathCompute do
 
   defp build_scoring(profiles, src, dst, now, band_config, native_duct) do
     {temps, dewpoints, pressures, gradients, bl_depths, pwats} =
-      Enum.reduce(profiles, {[], [], [], [], [], []}, fn p,
-                                                         {ts, ds, ps, gs, bs, ws} ->
+      Enum.reduce(profiles, {[], [], [], [], [], []}, fn p, {ts, ds, ps, gs, bs, ws} ->
         {
-          if(p.surface_temp_c != nil, do: [p.surface_temp_c | ts], else: ts),
-          if(p.surface_dewpoint_c != nil, do: [p.surface_dewpoint_c | ds], else: ds),
-          if(p.surface_pressure_mb != nil, do: [p.surface_pressure_mb | ps], else: ps),
-          if(p.min_refractivity_gradient != nil, do: [p.min_refractivity_gradient | gs],
-            else: gs),
-          if(p.hpbl_m != nil, do: [p.hpbl_m | bs], else: bs),
-          if(p.pwat_mm != nil, do: [p.pwat_mm | ws], else: ws)
+          if(p.surface_temp_c == nil, do: ts, else: [p.surface_temp_c | ts]),
+          if(p.surface_dewpoint_c == nil, do: ds, else: [p.surface_dewpoint_c | ds]),
+          if(p.surface_pressure_mb == nil, do: ps, else: [p.surface_pressure_mb | ps]),
+          if(p.min_refractivity_gradient == nil,
+            do: gs,
+            else: [p.min_refractivity_gradient | gs]
+          ),
+          if(p.hpbl_m == nil, do: bs, else: [p.hpbl_m | bs]),
+          if(p.pwat_mm == nil, do: ws, else: [p.pwat_mm | ws])
         }
       end)
 
diff --git a/lib/microwaveprop/propagation/profiles_file.ex b/lib/microwaveprop/propagation/profiles_file.ex
index 13b2180d..9ea17c99 100644
--- a/lib/microwaveprop/propagation/profiles_file.ex
+++ b/lib/microwaveprop/propagation/profiles_file.ex
@@ -168,7 +168,7 @@ defmodule Microwaveprop.Propagation.ProfilesFile do
 
   defp read_mp(valid_time) do
     with {:ok, gz} <- File.read(mp_path_for(valid_time)),
-         binary = :zlib.gunzip(gz),
+         {:ok, binary} <- gunzip_safe(gz),
          {:ok, body} <- Msgpax.unpack(binary) do
       {:ok, decode_mp_body(body)}
     else
@@ -176,6 +176,12 @@ defmodule Microwaveprop.Propagation.ProfilesFile do
     end
   end
 
+  defp gunzip_safe(data) do
+    {:ok, :zlib.gunzip(data)}
+  rescue
+    _ -> {:error, :corrupt}
+  end
+
   defp decode_mp_body(%{"cells" => cells}) when is_list(cells) do
     Map.new(cells, fn cell ->
       lat = cell |> Map.get("lat") |> to_float()
@@ -318,11 +324,8 @@ defmodule Microwaveprop.Propagation.ProfilesFile do
   end
 
   defp invalidate_all_caches do
-    # Match-delete every cached entry for this module without clobbering
-    # keys owned by other modules.
-    :ets.match_delete(:microwaveprop_cache, {{__MODULE__, :read, :_, :_}, :_, :_})
+    Microwaveprop.Cache.match_delete({{__MODULE__, :read, :_, :_}, :_, :_})
     Microwaveprop.Cache.invalidate({__MODULE__, :list_valid_times, base_dir()})
-    :ok
   end
 
   @doc """
diff --git a/lib/microwaveprop/propagation/scores_file.ex b/lib/microwaveprop/propagation/scores_file.ex
index 5c833c27..5b165102 100644
--- a/lib/microwaveprop/propagation/scores_file.ex
+++ b/lib/microwaveprop/propagation/scores_file.ex
@@ -509,11 +509,7 @@ defmodule Microwaveprop.Propagation.ScoresFile do
   end
 
   defp invalidate_all_list_caches do
-    # Cheaper than enumerating bands — clear every cached list entry.
-    # `Microwaveprop.Cache.clear/0` is overkill (it wipes unrelated
-    # keys too) so match-delete just this module's keys.
-    :ets.match_delete(:microwaveprop_cache, {{__MODULE__, :list_valid_times, :_, :_}, :_, :_})
-    :ok
+    Microwaveprop.Cache.match_delete({{__MODULE__, :list_valid_times, :_, :_}, :_, :_})
   end
 
   defp parse_valid_time_dt(filename) do
diff --git a/lib/microwaveprop/radio.ex b/lib/microwaveprop/radio.ex
index 210d84d3..b0f423ae 100644
--- a/lib/microwaveprop/radio.ex
+++ b/lib/microwaveprop/radio.ex
@@ -130,6 +130,7 @@ defmodule Microwaveprop.Radio do
     |> where([c], c.user_id == ^owner.id)
     |> filter_private_for_viewer(owner, viewer)
     |> order_by([c], desc: c.qso_timestamp, desc: c.id)
+    |> preload(:user)
     |> Repo.all()
   end
 
@@ -162,6 +163,7 @@ defmodule Microwaveprop.Radio do
     |> filter_private_for_callsign_viewer(viewer)
     |> order_by([c], desc: c.qso_timestamp, desc: c.id)
     |> limit(100)
+    |> preload(:user)
     |> Repo.all()
   end
 
diff --git a/lib/microwaveprop_web/endpoint.ex b/lib/microwaveprop_web/endpoint.ex
index 24fba93e..a694f8d0 100644
--- a/lib/microwaveprop_web/endpoint.ex
+++ b/lib/microwaveprop_web/endpoint.ex
@@ -8,6 +8,7 @@ defmodule MicrowavepropWeb.Endpoint do
     store: :cookie,
     key: "_microwaveprop_key",
     signing_salt: "FBet7+Mi",
+    encryption_salt: "fPEhSH1PIkX0MJMU1WL3",
     same_site: "Lax"
   ]
 
diff --git a/lib/microwaveprop_web/live/map_live.ex b/lib/microwaveprop_web/live/map_live.ex
index 5678fac0..0225e9d0 100644
--- a/lib/microwaveprop_web/live/map_live.ex
+++ b/lib/microwaveprop_web/live/map_live.ex
@@ -1051,10 +1051,16 @@ defmodule MicrowavepropWeb.MapLive do
     </div>
 
     <div role="alert" class="fixed top-2 right-2 z-[2000] flex flex-col gap-2 pointer-events-none">
-      <div :if={info = Phoenix.Flash.get(@flash, :info)} class="alert alert-info pointer-events-auto shadow-lg">
+      <div
+        :if={info = Phoenix.Flash.get(@flash, :info)}
+        class="alert alert-info pointer-events-auto shadow-lg"
+      >
         {info}
       </div>
-      <div :if={error = Phoenix.Flash.get(@flash, :error)} class="alert alert-error pointer-events-auto shadow-lg">
+      <div
+        :if={error = Phoenix.Flash.get(@flash, :error)}
+        class="alert alert-error pointer-events-auto shadow-lg"
+      >
         {error}
       </div>
     </div>
diff --git a/lib/microwaveprop_web/router.ex b/lib/microwaveprop_web/router.ex
index 0ef1f19e..2d965acd 100644
--- a/lib/microwaveprop_web/router.ex
+++ b/lib/microwaveprop_web/router.ex
@@ -221,13 +221,13 @@ defmodule MicrowavepropWeb.Router do
   scope "/", MicrowavepropWeb do
     pipe_through :browser
 
+    # Plain controller routes — outside live_session because they send raw
+    # responses (JSON, YAML, markdown) or render static HTML directly and
+    # don't need the on_mount hooks that set up LiveView session assigns.
     get "/", PageController, :home
     get "/api/contacts/map", ContactMapController, :show
     get "/weather/cells", WeatherTileController, :cells
     get "/scores/cells", ScoresController, :cells
-
-    # Static API doc artifacts. Outside the live_session so the
-    # raw-format endpoints don't get the LiveView root layout.
     get "/docs/api/openapi.yaml", ApiDocsController, :openapi_yaml
     get "/docs/api/README.md", ApiDocsController, :readme_markdown
 
diff --git a/priv/repo/migrations/20260529203624_add_enrichment_query_qso_timestamp_indexes.exs b/priv/repo/migrations/20260529203624_add_enrichment_query_qso_timestamp_indexes.exs
index 9459e799..6908d9ae 100644
--- a/priv/repo/migrations/20260529203624_add_enrichment_query_qso_timestamp_indexes.exs
+++ b/priv/repo/migrations/20260529203624_add_enrichment_query_qso_timestamp_indexes.exs
@@ -4,22 +4,27 @@ defmodule Microwaveprop.Repo.Migrations.AddEnrichmentQueryQsoTimestampIndexes do
   def change do
     create index(:contacts, [:qso_timestamp],
              where: "weather_status IN ('pending', 'failed') AND pos1 IS NOT NULL",
-             name: :contacts_weather_enrichment_qso_idx)
+             name: :contacts_weather_enrichment_qso_idx
+           )
 
     create index(:contacts, [:qso_timestamp],
              where: "hrrr_status IN ('pending', 'failed') AND pos1 IS NOT NULL",
-             name: :contacts_hrrr_enrichment_qso_idx)
+             name: :contacts_hrrr_enrichment_qso_idx
+           )
 
     create index(:contacts, [:qso_timestamp],
              where: "terrain_status IN ('pending', 'failed') AND pos1 IS NOT NULL",
-             name: :contacts_terrain_enrichment_qso_idx)
+             name: :contacts_terrain_enrichment_qso_idx
+           )
 
     create index(:contacts, [:qso_timestamp],
              where: "iemre_status IN ('pending', 'failed') AND pos1 IS NOT NULL",
-             name: :contacts_iemre_enrichment_qso_idx)
+             name: :contacts_iemre_enrichment_qso_idx
+           )
 
     create index(:contacts, [:qso_timestamp],
              where: "radar_status IN ('pending', 'failed') AND pos1 IS NOT NULL",
-             name: :contacts_radar_enrichment_qso_idx)
+             name: :contacts_radar_enrichment_qso_idx
+           )
   end
 end
diff --git a/test/microwaveprop/cache_test.exs b/test/microwaveprop/cache_test.exs
index ab460727..e6c7f045 100644
--- a/test/microwaveprop/cache_test.exs
+++ b/test/microwaveprop/cache_test.exs
@@ -47,9 +47,8 @@ defmodule Microwaveprop.CacheTest do
   describe "sweep/0" do
     test "removes expired entries" do
       Cache.put(:expired, "old", 1)
-      Process.sleep(5)
+      Cache.sweep()
 
-      assert Cache.sweep() >= 1
       assert :ets.lookup(:microwaveprop_cache, :expired) == []
     end
 
@@ -65,10 +64,7 @@ defmodule Microwaveprop.CacheTest do
       Cache.put(:expired_a, 1, 1)
       Cache.put(:expired_b, 2, 1)
       Cache.put(:fresh, 3, 60_000)
-      Process.sleep(5)
-
-      deleted = Cache.sweep()
-      assert deleted >= 2
+      Cache.sweep()
 
       assert :ets.lookup(:microwaveprop_cache, :expired_a) == []
       assert :ets.lookup(:microwaveprop_cache, :expired_b) == []
diff --git a/test/microwaveprop/propagation/freshness_monitor_test.exs b/test/microwaveprop/propagation/freshness_monitor_test.exs
index 78280f4c..eb93f1ee 100644
--- a/test/microwaveprop/propagation/freshness_monitor_test.exs
+++ b/test/microwaveprop/propagation/freshness_monitor_test.exs
@@ -151,7 +151,6 @@ defmodule Microwaveprop.Propagation.FreshnessMonitorTest do
 
       pid = start_supervised!(FreshnessMonitor)
       assert is_pid(pid)
-      assert Process.alive?(pid)
       assert Process.whereis(FreshnessMonitor) == pid
 
       # Force the init-time :check to be processed by issuing a
diff --git a/test/microwaveprop/propagation/notify_listener_test.exs b/test/microwaveprop/propagation/notify_listener_test.exs
index 72765633..1ae5c0a1 100644
--- a/test/microwaveprop/propagation/notify_listener_test.exs
+++ b/test/microwaveprop/propagation/notify_listener_test.exs
@@ -163,7 +163,7 @@ defmodule Microwaveprop.Propagation.NotifyListenerTest do
   end
 
   defp wait_until_step(fun, deadline) do
-    Process.sleep(20)
+    _ = :sys.get_state(pid)
 
     cond do
       fun.() -> true
diff --git a/test/microwaveprop/pskr/client_test.exs b/test/microwaveprop/pskr/client_test.exs
index 9d4a5841..e38e458a 100644
--- a/test/microwaveprop/pskr/client_test.exs
+++ b/test/microwaveprop/pskr/client_test.exs
@@ -69,24 +69,21 @@ defmodule Microwaveprop.Pskr.ClientTest do
       # state.socket is nil, but :tcp pattern matches when socket matches state.socket.
       # Since state.socket is nil, this falls through to the catch-all handle_info.
       send(pid, {:tcp, :stale_port, "data"})
-      Process.sleep(20)
-      assert Process.alive?(pid)
+      _ = :sys.get_state(pid)
       GenServer.stop(pid)
     end
 
     test "tcp_closed for a stale socket is ignored", %{placeholder: _} do
       {:ok, pid} = GenServer.start_link(Client, [])
       send(pid, {:tcp_closed, :stale_port})
-      Process.sleep(20)
-      assert Process.alive?(pid)
+      _ = :sys.get_state(pid)
       GenServer.stop(pid)
     end
 
     test "tcp_error for a stale socket is ignored", %{placeholder: _} do
       {:ok, pid} = GenServer.start_link(Client, [])
       send(pid, {:tcp_error, :stale_port, :reason})
-      Process.sleep(20)
-      assert Process.alive?(pid)
+      _ = :sys.get_state(pid)
       GenServer.stop(pid)
     end
   end
@@ -95,11 +92,7 @@ defmodule Microwaveprop.Pskr.ClientTest do
     test "schedules a connect attempt for a standby (immediate :continue, :connect)" do
       {:ok, pid} = GenServer.start_link(Client, [])
       send(pid, :reconnect)
-      Process.sleep(50)
-      # The handle_info(:reconnect) returns {:noreply, state, {:continue, :connect}}.
-      # The connect will fail (no MQTT broker reachable) and schedule another retry.
-      # We just verify the process didn't crash on receipt.
-      assert Process.alive?(pid)
+      _ = :sys.get_state(pid)
       GenServer.stop(pid)
     end
   end
@@ -108,8 +101,9 @@ defmodule Microwaveprop.Pskr.ClientTest do
     test "is graceful when state has no socket" do
       {:ok, pid} = GenServer.start_link(Client, [])
       # Just normal stop — terminate(_, %{socket: nil_or_other})
+      ref = Process.monitor(pid)
       GenServer.stop(pid)
-      refute Process.alive?(pid)
+      assert_receive {:DOWN, ^ref, :process, ^pid, _reason}, 1000
     end
   end
 
@@ -117,7 +111,7 @@ defmodule Microwaveprop.Pskr.ClientTest do
     test "nodeup re-runs election (stays standby while name is taken)" do
       {:ok, pid} = GenServer.start_link(Client, [])
       send(pid, {:nodeup, :test@nowhere})
-      Process.sleep(50)
+      _ = :sys.get_state(pid)
 
       state = :sys.get_state(pid)
       assert state.role == :standby
@@ -127,7 +121,7 @@ defmodule Microwaveprop.Pskr.ClientTest do
     test "nodedown re-runs election (stays standby while name is taken)" do
       {:ok, pid} = GenServer.start_link(Client, [])
       send(pid, {:nodedown, :test@nowhere})
-      Process.sleep(50)
+      _ = :sys.get_state(pid)
 
       state = :sys.get_state(pid)
       assert state.role == :standby
@@ -137,16 +131,14 @@ defmodule Microwaveprop.Pskr.ClientTest do
     test "unrelated info messages are ignored" do
       {:ok, pid} = GenServer.start_link(Client, [])
       send(pid, :unrelated_message)
-      Process.sleep(20)
-
-      assert Process.alive?(pid)
+      _ = :sys.get_state(pid)
       GenServer.stop(pid)
     end
 
     test ":ping with no socket is a no-op" do
       {:ok, pid} = GenServer.start_link(Client, [])
       send(pid, :ping)
-      Process.sleep(20)
+      _ = :sys.get_state(pid)
       state = :sys.get_state(pid)
       assert state.socket == nil
       GenServer.stop(pid)
diff --git a/test/microwaveprop_web/live/contact_live/index_test.exs b/test/microwaveprop_web/live/contact_live/index_test.exs
new file mode 100644
index 00000000..10488be6
--- /dev/null
+++ b/test/microwaveprop_web/live/contact_live/index_test.exs
@@ -0,0 +1,240 @@
+defmodule MicrowavepropWeb.ContactLive.IndexTest do
+  use MicrowavepropWeb.ConnCase, async: true
+
+  import Phoenix.LiveViewTest
+
+  alias Microwaveprop.Radio.Contact
+  alias Microwaveprop.Repo
+  alias Microwaveprop.Terrain.ElevationClient
+  alias Microwaveprop.Weather.HrrrNativeProfile
+  alias Microwaveprop.Weather.NarrProfile
+
+  setup do
+    Req.Test.stub(ElevationClient, fn conn ->
+      Req.Test.json(conn, [])
+    end)
+
+    Req.Test.stub(Microwaveprop.Weather.HrrrClient, fn conn ->
+      Plug.Conn.send_resp(conn, 404, "not found")
+    end)
+
+    Req.Test.stub(Microwaveprop.Weather.SolarClient, fn conn ->
+      Req.Test.text(conn, "")
+    end)
+
+    :ok
+  end
+
+  defp create_contact(attrs \\ %{}) do
+    default = %{
+      station1: "W5XD",
+      station2: "K5TR",
+      qso_timestamp: ~U[2026-03-28 18:00:00Z],
+      mode: "CW",
+      band: Decimal.new("1296"),
+      grid1: "EM12",
+      grid2: "EM00",
+      pos1: %{"lat" => 32.9, "lon" => -97.0},
+      pos2: %{"lat" => 30.3, "lon" => -97.7},
+      distance_km: Decimal.new("295")
+    }
+
+    merged = Map.merge(default, attrs)
+    {user_id, changeset_attrs} = Map.pop(merged, :user_id)
+
+    {:ok, contact} =
+      %Contact{user_id: user_id}
+      |> Contact.changeset(changeset_attrs)
+      |> Repo.insert()
+
+    contact
+  end
+
+  describe "Index" do
+    test "renders page with Contacts heading", %{conn: conn} do
+      {:ok, _lv, html} = live(conn, ~p"/contacts")
+      assert html =~ "Contacts"
+    end
+
+    test "shows total contact count in subtitle", %{conn: conn} do
+      create_contact()
+      create_contact(%{station1: "N5AC"})
+      create_contact(%{station1: "K5TR"})
+
+      {:ok, _lv, html} = live(conn, ~p"/contacts")
+      assert html =~ "3 total"
+    end
+
+    test "table shows contact data", %{conn: conn} do
+      create_contact()
+
+      {:ok, _lv, html} = live(conn, ~p"/contacts")
+      assert html =~ "W5XD"
+      assert html =~ "K5TR"
+      assert html =~ "CW"
+      assert html =~ "1296"
+    end
+
+    test "row links to detail page", %{conn: conn} do
+      contact = create_contact()
+
+      {:ok, _lv, html} = live(conn, ~p"/contacts")
+      assert html =~ ~p"/contacts/#{contact.id}"
+    end
+
+    test "sort params order the table", %{conn: conn} do
+      create_contact(%{station1: "ZZ9ZZ"})
+      create_contact(%{station1: "AA1AA"})
+
+      {:ok, _lv, html} = live(conn, ~p"/contacts?sort_params[station1]=asc")
+
+      aa_pos = html |> :binary.match("AA1AA") |> elem(0)
+      zz_pos = html |> :binary.match("ZZ9ZZ") |> elem(0)
+      assert aa_pos < zz_pos
+    end
+
+    test "search by single callsign matches either station", %{conn: conn} do
+      create_contact(%{station1: "W5LUA", station2: "W5HN"})
+      create_contact(%{station1: "K5TR", station2: "N5AC"})
+
+      {:ok, _lv, html} = live(conn, ~p"/contacts?search=W5LUA")
+      assert html =~ "W5LUA"
+      refute html =~ "N5AC"
+    end
+
+    test "pagination reaches later pages", %{conn: conn} do
+      for i <- 1..25 do
+        ts = DateTime.add(~U[2026-01-01 00:00:00Z], i * 3600, :second)
+        create_contact(%{qso_timestamp: ts, station1: "W#{i}TEST"})
+      end
+
+      {:ok, _lv, html} = live(conn, ~p"/contacts")
+      assert html =~ "Page"
+
+      {:ok, _lv, html2} = live(conn, ~p"/contacts?page=2")
+      assert html2 =~ "Page"
+    end
+
+    test "renders a per-month bar chart that sums across years", %{conn: conn} do
+      create_contact(%{qso_timestamp: ~U[2025-03-15 12:00:00Z], station1: "W5MAR"})
+      create_contact(%{qso_timestamp: ~U[2026-03-22 12:00:00Z], station1: "K5MAR"})
+      create_contact(%{qso_timestamp: ~U[2026-07-10 12:00:00Z], station1: "W5JUL"})
+
+      {:ok, _lv, html} = live(conn, ~p"/contacts")
+
+      assert html =~ "Contacts by month"
+      assert html =~ ~s|data-month="3"|
+      assert html =~ ~s|data-month-count="2"|
+      assert html =~ ~s|data-month="7"|
+      assert html =~ ~s|data-month-count="1"|
+      assert html =~ ~s|data-month="1"|
+      assert html =~ ~s|data-month-count="0"|
+    end
+  end
+
+  describe "Index private visibility" do
+    import Microwaveprop.AccountsFixtures
+
+    test "anonymous viewer does not see private contacts in the table", %{conn: conn} do
+      _private = create_contact(%{station1: "W5PRV", private: true})
+      _public = create_contact(%{station1: "W5PUB", qso_timestamp: ~U[2026-03-28 19:00:00Z]})
+
+      {:ok, _lv, html} = live(conn, ~p"/contacts")
+
+      assert html =~ "W5PUB"
+      refute html =~ "W5PRV"
+    end
+
+    test "owner sees their own private inline with Yes badge", %{conn: conn} do
+      owner = user_fixture()
+      _private = create_contact(%{station1: "W5PRV", private: true, user_id: owner.id})
+      _public = create_contact(%{station1: "W5PUB", qso_timestamp: ~U[2026-03-28 19:00:00Z]})
+      conn = log_in_user(conn, owner)
+
+      {:ok, _lv, html} = live(conn, ~p"/contacts")
+
+      assert html =~ "W5PRV"
+      assert html =~ "W5PUB"
+      assert html =~ "badge-warning"
+    end
+
+    test "admin sees all private contacts", %{conn: conn} do
+      admin = user_fixture() |> Ecto.Changeset.change(is_admin: true) |> Repo.update!()
+      _private = create_contact(%{station1: "W5PRV", private: true})
+      _public = create_contact(%{station1: "W5PUB", qso_timestamp: ~U[2026-03-28 19:00:00Z]})
+      conn = log_in_user(conn, admin)
+
+      {:ok, _lv, html} = live(conn, ~p"/contacts")
+      assert html =~ "W5PRV"
+      assert html =~ "W5PUB"
+    end
+
+    test "non-owning user does not see others' private", %{conn: conn} do
+      owner = user_fixture()
+      viewer = user_fixture()
+      _private = create_contact(%{station1: "W5PRV", private: true, user_id: owner.id})
+      _public = create_contact(%{station1: "W5PUB", qso_timestamp: ~U[2026-03-28 19:00:00Z]})
+      conn = log_in_user(conn, viewer)
+
+      {:ok, _lv, html} = live(conn, ~p"/contacts")
+      assert html =~ "W5PUB"
+      refute html =~ "W5PRV"
+    end
+  end
+
+  describe "Index private column visibility" do
+    import Microwaveprop.AccountsFixtures
+
+    test "column hidden for anonymous viewer when no private contacts exist", %{conn: conn} do
+      _public = create_contact(%{station1: "W5PUB"})
+
+      {:ok, _lv, html} = live(conn, ~p"/contacts")
+      refute html =~ ">Private<"
+    end
+
+    test "column hidden for anonymous viewer even when others have private contacts", %{conn: conn} do
+      _private = create_contact(%{station1: "W5PRV", private: true})
+      _public = create_contact(%{station1: "W5PUB"})
+
+      {:ok, _lv, html} = live(conn, ~p"/contacts")
+      refute html =~ ">Private<"
+    end
+
+    test "column hidden for a user who has no private contacts of their own", %{conn: conn} do
+      owner = user_fixture()
+      viewer = user_fixture()
+      _others_private = create_contact(%{station1: "W5PRV", private: true, user_id: owner.id})
+      conn = log_in_user(conn, viewer)
+
+      {:ok, _lv, html} = live(conn, ~p"/contacts")
+      refute html =~ ">Private<"
+    end
+
+    test "column visible for a user with at least one of their own private contacts", %{conn: conn} do
+      owner = user_fixture()
+      _private = create_contact(%{station1: "W5PRV", private: true, user_id: owner.id})
+      conn = log_in_user(conn, owner)
+
+      {:ok, _lv, html} = live(conn, ~p"/contacts")
+      assert html =~ ">Private<"
+    end
+
+    test "column hidden for admin when there are no private contacts anywhere", %{conn: conn} do
+      admin = user_fixture() |> Ecto.Changeset.change(is_admin: true) |> Repo.update!()
+      _public = create_contact(%{station1: "W5PUB"})
+      conn = log_in_user(conn, admin)
+
+      {:ok, _lv, html} = live(conn, ~p"/contacts")
+      refute html =~ ">Private<"
+    end
+
+    test "column visible for admin as soon as any private contact exists", %{conn: conn} do
+      admin = user_fixture() |> Ecto.Changeset.change(is_admin: true) |> Repo.update!()
+      _private = create_contact(%{station1: "W5PRV", private: true})
+      conn = log_in_user(conn, admin)
+
+      {:ok, _lv, html} = live(conn, ~p"/contacts")
+      assert html =~ ">Private<"
+    end
+  end
+end
diff --git a/test/microwaveprop_web/live/contact_live/show_coverage_test.exs b/test/microwaveprop_web/live/contact_live/show_coverage_test.exs
new file mode 100644
index 00000000..06174706
--- /dev/null
+++ b/test/microwaveprop_web/live/contact_live/show_coverage_test.exs
@@ -0,0 +1,1809 @@
+defmodule MicrowavepropWeb.ContactLive.ShowCoverageTest do
+  use MicrowavepropWeb.ConnCase, async: true
+
+  import Phoenix.LiveViewTest
+
+  alias Microwaveprop.Radio.Contact
+  alias Microwaveprop.Repo
+  alias Microwaveprop.Terrain.ElevationClient
+  alias Microwaveprop.Weather.HrrrNativeProfile
+  alias Microwaveprop.Weather.NarrProfile
+
+  setup do
+    Req.Test.stub(ElevationClient, fn conn ->
+      Req.Test.json(conn, [])
+    end)
+
+    Req.Test.stub(Microwaveprop.Weather.HrrrClient, fn conn ->
+      Plug.Conn.send_resp(conn, 404, "not found")
+    end)
+
+    Req.Test.stub(Microwaveprop.Weather.SolarClient, fn conn ->
+      Req.Test.text(conn, "")
+    end)
+
+    :ok
+  end
+
+  defp create_contact(attrs \\ %{}) do
+    default = %{
+      station1: "W5XD",
+      station2: "K5TR",
+      qso_timestamp: ~U[2026-03-28 18:00:00Z],
+      mode: "CW",
+      band: Decimal.new("1296"),
+      grid1: "EM12",
+      grid2: "EM00",
+      pos1: %{"lat" => 32.9, "lon" => -97.0},
+      pos2: %{"lat" => 30.3, "lon" => -97.7},
+      distance_km: Decimal.new("295")
+    }
+
+    merged = Map.merge(default, attrs)
+    {user_id, changeset_attrs} = Map.pop(merged, :user_id)
+
+    {:ok, contact} =
+      %Contact{user_id: user_id}
+      |> Contact.changeset(changeset_attrs)
+      |> Repo.insert()
+
+    contact
+  end
+
+  describe "Show additional branch coverage" do
+    use ExUnitProperties
+
+    import Microwaveprop.AccountsFixtures
+
+    alias Microwaveprop.Propagation.BandConfig
+    alias Microwaveprop.Propagation.ScoreCache
+    alias Microwaveprop.Propagation.Scorer
+    alias Microwaveprop.Radio.ContactCommonVolumeRadar
+    alias Microwaveprop.Radio.ContactEdit
+    alias Microwaveprop.Terrain.TerrainProfile
+    alias Microwaveprop.Weather.HrrrProfile
+
+    defp admin_fixture! do
+      user = user_fixture()
+      {:ok, user} = Microwaveprop.Accounts.admin_update_user(user, %{is_admin: true})
+      user
+    end
+
+    setup do
+      ScoreCache.clear()
+      :ok
+    end
+
+    test "factor notes render every note-branch for a 10 GHz contact", %{conn: conn} do
+      contact =
+        create_contact(%{
+          band: Decimal.new("10000"),
+          pos1: %{"lat" => 32.9, "lon" => -97.0},
+          pos2: %{"lat" => 30.3, "lon" => -97.7},
+          qso_timestamp: ~U[2026-03-28 18:00:00Z]
+        })
+
+      Repo.insert!(%HrrrProfile{
+        valid_time: contact.qso_timestamp,
+        lat: 32.9,
+        lon: -97.0,
+        profile: [
+          %{"pres" => 1000.0, "tmpc" => 22.0, "dwpc" => 12.0, "hght" => 100.0}
+        ],
+        hpbl_m: 1200.0,
+        pwat_mm: 32.0,
+        surface_temp_c: 22.0,
+        surface_dewpoint_c: 12.0,
+        surface_pressure_mb: 1020.0,
+        surface_refractivity: 340.0,
+        min_refractivity_gradient: -160.0,
+        ducting_detected: true
+      })
+
+      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
+      html = render_async(lv, 2_000)
+
+      assert html =~ "beneficial at this band"
+      assert html =~ "ducting"
+      assert html =~ "(high)"
+      assert html =~ "summer peak band"
+      assert html =~ "refractivity aid"
+      assert html =~ "None"
+    end
+
+    test "factor notes render 'absorption' and 'winter peak' branches at 24 GHz", %{conn: conn} do
+      contact =
+        create_contact(%{
+          band: Decimal.new("24000"),
+          pos1: %{"lat" => 32.9, "lon" => -97.0},
+          pos2: %{"lat" => 30.3, "lon" => -97.7},
+          qso_timestamp: ~U[2026-01-15 18:00:00Z]
+        })
+
+      Repo.insert!(%HrrrProfile{
+        valid_time: contact.qso_timestamp,
+        lat: 32.9,
+        lon: -97.0,
+        profile: [
+          %{"pres" => 1000.0, "tmpc" => 5.0, "dwpc" => -2.0, "hght" => 100.0}
+        ],
+        hpbl_m: 1200.0,
+        pwat_mm: 28.0,
+        surface_temp_c: 5.0,
+        surface_dewpoint_c: -2.0,
+        surface_pressure_mb: 1000.0,
+        surface_refractivity: 310.0,
+        min_refractivity_gradient: -50.0,
+        ducting_detected: false
+      })
+
+      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
+      html = render_async(lv, 2_000)
+
+      assert html =~ "harmful at this band"
+      assert html =~ "absorption"
+      assert html =~ "winter peak band"
+      assert html =~ "(low)"
+    end
+
+    test "td_note renders 'near saturation' when dewpoint hugs temperature", %{conn: conn} do
+      contact =
+        create_contact(%{
+          band: Decimal.new("10000"),
+          pos1: %{"lat" => 32.9, "lon" => -97.0},
+          pos2: %{"lat" => 30.3, "lon" => -97.7}
+        })
+
+      Repo.insert!(%HrrrProfile{
+        valid_time: contact.qso_timestamp,
+        lat: 32.9,
+        lon: -97.0,
+        profile: [%{"pres" => 1000.0, "tmpc" => 20.0, "dwpc" => 19.5, "hght" => 100.0}],
+        hpbl_m: 800.0,
+        pwat_mm: 25.0,
+        surface_temp_c: 20.0,
+        surface_dewpoint_c: 19.5,
+        surface_pressure_mb: 1010.0,
+        surface_refractivity: 340.0,
+        min_refractivity_gradient: -90.0,
+        ducting_detected: false
+      })
+
+      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
+      html = render_async(lv, 2_000)
+
+      assert html =~ "near saturation"
+      assert html =~ "enhanced"
+      assert html =~ "(moderate)"
+    end
+
+    test "td_note renders 'dry' branch for a large T-Td depression", %{conn: conn} do
+      contact =
+        create_contact(%{
+          band: Decimal.new("10000"),
+          pos1: %{"lat" => 32.9, "lon" => -97.0},
+          pos2: %{"lat" => 30.3, "lon" => -97.7}
+        })
+
+      Repo.insert!(%HrrrProfile{
+        valid_time: contact.qso_timestamp,
+        lat: 32.9,
+        lon: -97.0,
+        profile: [%{"pres" => 1000.0, "tmpc" => 30.0, "dwpc" => 0.0, "hght" => 100.0}],
+        hpbl_m: 2200.0,
+        pwat_mm: 8.0,
+        surface_temp_c: 30.0,
+        surface_dewpoint_c: 0.0,
+        surface_pressure_mb: 1012.0,
+        surface_refractivity: 280.0,
+        min_refractivity_gradient: -40.0,
+        ducting_detected: false
+      })
+
+      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
+      html = render_async(lv, 2_000)
+
+      assert html =~ "(dry)"
+      assert html =~ "(normal)"
+    end
+
+    test "BLOCKED terrain with ducting selects the 'atmospheric ducting' mechanism copy", %{conn: conn} do
+      contact =
+        create_contact(%{
+          band: Decimal.new("10000"),
+          pos1: %{"lat" => 32.9, "lon" => -97.0},
+          pos2: %{"lat" => 30.3, "lon" => -97.7}
+        })
+
+      Repo.insert!(%HrrrProfile{
+        valid_time: contact.qso_timestamp,
+        lat: 32.9,
+        lon: -97.0,
+        profile: [%{"pres" => 1000.0, "tmpc" => 20.0, "dwpc" => 15.0, "hght" => 100.0}],
+        hpbl_m: 800.0,
+        pwat_mm: 30.0,
+        surface_temp_c: 20.0,
+        surface_dewpoint_c: 15.0,
+        surface_pressure_mb: 1015.0,
+        surface_refractivity: 340.0,
+        min_refractivity_gradient: -180.0,
+        ducting_detected: true
+      })
+
+      Repo.insert!(%TerrainProfile{
+        contact_id: contact.id,
+        sample_count: 100,
+        path_points: [%{"lat" => 32.9, "lon" => -97.0, "dist_km" => 0.0, "elev" => 200.0}],
+        max_elevation_m: 800.0,
+        min_clearance_m: -50.0,
+        diffraction_db: 22.0,
+        fresnel_hit_count: 5,
+        obstructed_count: 4,
+        verdict: "BLOCKED"
+      })
+
+      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
+      html = render_async(lv, 2_000)
+
+      assert html =~ "tropospheric duct" or html =~ "atmospheric ducting"
+    end
+
+    test "BLOCKED terrain with enhanced refraction but no ducting uses the 'dN/dh' copy", %{conn: conn} do
+      contact =
+        create_contact(%{
+          band: Decimal.new("10000"),
+          pos1: %{"lat" => 32.9, "lon" => -97.0},
+          pos2: %{"lat" => 30.3, "lon" => -97.7}
+        })
+
+      Repo.insert!(%HrrrProfile{
+        valid_time: contact.qso_timestamp,
+        lat: 32.9,
+        lon: -97.0,
+        profile: [%{"pres" => 1000.0, "tmpc" => 20.0, "dwpc" => 10.0, "hght" => 100.0}],
+        hpbl_m: 1200.0,
+        pwat_mm: 20.0,
+        surface_temp_c: 20.0,
+        surface_dewpoint_c: 10.0,
+        surface_pressure_mb: 1015.0,
+        surface_refractivity: 320.0,
+        min_refractivity_gradient: -140.0,
+        ducting_detected: false
+      })
+
+      Repo.insert!(%TerrainProfile{
+        contact_id: contact.id,
+        sample_count: 100,
+        path_points: [%{"lat" => 32.9, "lon" => -97.0, "dist_km" => 0.0, "elev" => 200.0}],
+        max_elevation_m: 800.0,
+        min_clearance_m: -20.0,
+        diffraction_db: 18.0,
+        fresnel_hit_count: 3,
+        obstructed_count: 2,
+        verdict: "BLOCKED"
+      })
+
+      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
+      html = render_async(lv, 2_000)
+
+      assert html =~ "dN/dh ="
+      assert html =~ "Enhanced refraction"
+    end
+
+    test "BLOCKED terrain with no ducting or refraction falls back to diffraction copy", %{conn: conn} do
+      contact =
+        create_contact(%{
+          band: Decimal.new("10000"),
+          pos1: %{"lat" => 32.9, "lon" => -97.0},
+          pos2: %{"lat" => 30.3, "lon" => -97.7}
+        })
+
+      Repo.insert!(%HrrrProfile{
+        valid_time: contact.qso_timestamp,
+        lat: 32.9,
+        lon: -97.0,
+        profile: [%{"pres" => 1000.0, "tmpc" => 20.0, "dwpc" => 10.0, "hght" => 100.0}],
+        hpbl_m: 1200.0,
+        pwat_mm: 20.0,
+        surface_temp_c: 20.0,
+        surface_dewpoint_c: 10.0,
+        surface_pressure_mb: 1015.0,
+        surface_refractivity: 320.0,
+        min_refractivity_gradient: -30.0,
+        ducting_detected: false
+      })
+
+      Repo.insert!(%TerrainProfile{
+        contact_id: contact.id,
+        sample_count: 100,
+        path_points: [%{"lat" => 32.9, "lon" => -97.0, "dist_km" => 0.0, "elev" => 200.0}],
+        max_elevation_m: 800.0,
+        min_clearance_m: -20.0,
+        diffraction_db: 14.5,
+        fresnel_hit_count: 3,
+        obstructed_count: 2,
+        verdict: "BLOCKED"
+      })
+
+      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
+      html = render_async(lv, 2_000)
+
+      assert html =~ "diffraction loss"
+      assert html =~ "knife-edge diffraction"
+    end
+
+    test "clear path with long distance + ducting renders 'extending range' copy", %{conn: conn} do
+      contact =
+        create_contact(%{
+          band: Decimal.new("10000"),
+          pos1: %{"lat" => 32.9, "lon" => -97.0},
+          pos2: %{"lat" => 30.3, "lon" => -97.7},
+          distance_km: Decimal.new("295")
+        })
+
+      Repo.insert!(%HrrrProfile{
+        valid_time: contact.qso_timestamp,
+        lat: 32.9,
+        lon: -97.0,
+        profile: [%{"pres" => 1000.0, "tmpc" => 22.0, "dwpc" => 20.0, "hght" => 100.0}],
+        hpbl_m: 700.0,
+        pwat_mm: 30.0,
+        surface_temp_c: 22.0,
+        surface_dewpoint_c: 20.0,
+        surface_pressure_mb: 1012.0,
+        surface_refractivity: 350.0,
+        min_refractivity_gradient: -200.0,
+        ducting_detected: true
+      })
+
+      Repo.insert!(%TerrainProfile{
+        contact_id: contact.id,
+        sample_count: 100,
+        path_points: [%{"lat" => 32.9, "lon" => -97.0, "dist_km" => 0.0, "elev" => 200.0}],
+        max_elevation_m: 400.0,
+        min_clearance_m: 50.0,
+        diffraction_db: 0.0,
+        fresnel_hit_count: 0,
+        obstructed_count: 0,
+        verdict: "CLEAR"
+      })
+
+      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
+      html = render_async(lv, 2_000)
+
+      assert html =~ "Ducting conditions present"
+      assert html =~ "extended range" or html =~ "extending range"
+    end
+
+    test "clear path with enhanced refraction but no ducting hits the long-path branch", %{conn: conn} do
+      contact =
+        create_contact(%{
+          band: Decimal.new("10000"),
+          pos1: %{"lat" => 32.9, "lon" => -97.0},
+          pos2: %{"lat" => 30.3, "lon" => -97.7},
+          distance_km: Decimal.new("200")
+        })
+
+      Repo.insert!(%HrrrProfile{
+        valid_time: contact.qso_timestamp,
+        lat: 32.9,
+        lon: -97.0,
+        profile: [%{"pres" => 1000.0, "tmpc" => 20.0, "dwpc" => 10.0, "hght" => 100.0}],
+        hpbl_m: 1200.0,
+        pwat_mm: 20.0,
+        surface_temp_c: 20.0,
+        surface_dewpoint_c: 10.0,
+        surface_pressure_mb: 1012.0,
+        surface_refractivity: 320.0,
+        min_refractivity_gradient: -140.0,
+        ducting_detected: false
+      })
+
+      Repo.insert!(%TerrainProfile{
+        contact_id: contact.id,
+        sample_count: 100,
+        path_points: [%{"lat" => 32.9, "lon" => -97.0, "dist_km" => 0.0, "elev" => 200.0}],
+        max_elevation_m: 400.0,
+        min_clearance_m: 50.0,
+        diffraction_db: 0.0,
+        fresnel_hit_count: 0,
+        obstructed_count: 0,
+        verdict: "CLEAR"
+      })
+
+      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
+      html = render_async(lv, 2_000)
+
+      assert html =~ "Enhanced refraction present"
+    end
+
+    test "admin edit of private toggle and height triggers the diff branch", %{conn: conn} do
+      contact = create_contact()
+      admin = admin_fixture!()
+      conn = log_in_user(conn, admin)
+
+      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
+      render_click(lv, "toggle_edit", %{})
+
+      html =
+        render_submit(lv, "submit_edit", %{
+          "edit" => %{
+            "station1" => contact.station1,
+            "station2" => contact.station2,
+            "grid1" => contact.grid1,
+            "grid2" => contact.grid2,
+            "mode" => contact.mode,
+            "height1_ft" => "35",
+            "private" => "true"
+          }
+        })
+
+      assert html =~ "Contact updated"
+
+      refreshed = Repo.get!(Contact, contact.id)
+      assert refreshed.height1_ft == 35
+      assert refreshed.private == true
+    end
+
+    test "admin edit with no changes flashes 'No changes detected'", %{conn: conn} do
+      contact = create_contact()
+      admin = admin_fixture!()
+      conn = log_in_user(conn, admin)
+
+      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
+      render_click(lv, "toggle_edit", %{})
+
+      html =
+        render_submit(lv, "submit_edit", %{
+          "edit" => %{
+            "station1" => contact.station1,
+            "station2" => contact.station2,
+            "grid1" => contact.grid1,
+            "grid2" => contact.grid2,
+            "mode" => contact.mode
+          }
+        })
+
+      assert html =~ "No changes detected"
+    end
+
+    test "owner submit with identical values returns no-changes flash", %{conn: conn} do
+      owner = user_fixture()
+
+      {:ok, contact} =
+        %Contact{}
+        |> Contact.changeset(%{
+          station1: owner.callsign,
+          station2: "K5TR",
+          qso_timestamp: ~U[2026-03-28 18:00:00Z],
+          mode: "CW",
+          band: Decimal.new("1296"),
+          grid1: "EM12",
+          grid2: "EM00",
+          pos1: %{"lat" => 32.9, "lon" => -97.0},
+          pos2: %{"lat" => 30.3, "lon" => -97.7},
+          distance_km: Decimal.new("295"),
+          user_submitted: true,
+          submitter_email: owner.email
+        })
+        |> Ecto.Changeset.change(user_id: owner.id)
+        |> Repo.insert()
+
+      conn = log_in_user(conn, owner)
+      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
+      render_click(lv, "toggle_edit", %{})
+
+      html =
+        render_submit(lv, "submit_edit", %{
+          "edit" => %{
+            "station1" => contact.station1,
+            "station2" => contact.station2,
+            "grid1" => contact.grid1,
+            "grid2" => contact.grid2,
+            "mode" => contact.mode
+          }
+        })
+
+      assert html =~ "No changes detected"
+    end
+
+    test "stranger submit with an invalid mode surfaces the changeset error flash", %{conn: conn} do
+      contact = create_contact()
+      stranger = user_fixture()
+      conn = log_in_user(conn, stranger)
+
+      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
+      render_click(lv, "toggle_edit", %{})
+
+      html =
+        render_submit(lv, "submit_edit", %{
+          "edit" => %{
+            "station1" => contact.station1,
+            "station2" => contact.station2,
+            "grid1" => contact.grid1,
+            "grid2" => contact.grid2,
+            "mode" => "BOGUS"
+          }
+        })
+
+      assert html =~ "Could not submit edit"
+      assert Repo.aggregate(ContactEdit, :count, :id) == 0
+    end
+
+    test "internal_network? false when no session IP is recorded", %{conn: conn} do
+      contact = create_contact()
+
+      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
+      _ = render_async(lv, 2_000)
+
+      refute :sys.get_state(lv.pid).socket.assigns.can_enqueue
+    end
+
+    test "internal_network? false for an IP just outside the enqueue subnet", %{conn: conn} do
+      conn = %{conn | remote_ip: {8, 8, 8, 8}}
+      contact = create_contact()
+
+      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
+      _ = render_async(lv, 2_000)
+
+      refute :sys.get_state(lv.pid).socket.assigns.can_enqueue
+    end
+
+    test "internal_network? true when session IP sits inside the enqueue subnet", %{conn: conn} do
+      conn = %{conn | remote_ip: {172, 56, 0, 10}}
+      contact = create_contact()
+
+      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
+      _ = render_async(lv, 2_000)
+
+      assert :sys.get_state(lv.pid).socket.assigns.can_enqueue
+    end
+
+    test "expanded_soundings MapSet exposes the skew-T table when a sounding is expanded",
+         %{conn: conn} do
+      alias Microwaveprop.Weather
+      alias Microwaveprop.Weather.Sounding
+
+      contact = create_contact()
+
+      {:ok, station} =
+        Weather.find_or_create_station(%{
+          station_code: "KFWD",
+          station_type: "sounding",
+          name: "Fort Worth",
+          lat: 32.83,
+          lon: -97.30
+        })
+
+      {:ok, sounding} =
+        %Sounding{}
+        |> Sounding.changeset(%{
+          station_id: station.id,
+          observed_at: ~U[2026-03-28 12:00:00Z],
+          profile: [
+            %{"pres" => 1000.0, "tmpc" => 20.0, "dwpc" => 15.0, "hght" => 100.0},
+            %{"pres" => 850.0, "tmpc" => 12.0, "dwpc" => 8.0, "hght" => 1500.0}
+          ],
+          level_count: 2,
+          surface_temp_c: 20.0,
+          surface_dewpoint_c: 15.0
+        })
+        |> Repo.insert()
+
+      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
+      _ = render_async(lv, 2_000)
+
+      html_open = render_click(lv, "toggle_profile", %{"id" => sounding.id})
+      assert html_open =~ "Wind Dir"
+
+      html_closed = render_click(lv, "toggle_profile", %{"id" => sounding.id})
+      refute html_closed =~ "Wind Dir"
+    end
+
+    test "load_pending_edit returns the existing edit for a logged-in user", %{conn: conn} do
+      contact = create_contact()
+      user = user_fixture()
+
+      Repo.insert!(%ContactEdit{
+        contact_id: contact.id,
+        user_id: user.id,
+        proposed_changes: %{"station2" => "K9EDIT"},
+        status: :pending
+      })
+
+      conn = log_in_user(conn, user)
+      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
+
+      assigns = :sys.get_state(lv.pid).socket.assigns
+      assert %ContactEdit{status: :pending} = assigns.pending_edit
+    end
+
+    test "fetch_queue_counts hits the Cache.fetch_or_store round trip", %{conn: conn} do
+      alias Microwaveprop.Workers.SolarIndexWorker
+
+      {:ok, _job} = Oban.insert(SolarIndexWorker.new(%{"date" => "2026-03-28"}))
+
+      contact = create_contact()
+      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
+
+      counts = :sys.get_state(lv.pid).socket.assigns.queue_counts
+      assert is_map(counts)
+    end
+
+    test "handle_info({:sounding_fetched, …}) with mismatched contact_id is a no-op",
+         %{conn: conn} do
+      contact = create_contact()
+      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
+      _ = render_async(lv, 2_000)
+
+      soundings_before = :sys.get_state(lv.pid).socket.assigns.soundings
+      send(lv.pid, {:sounding_fetched, %{contact_id: Ecto.UUID.generate()}})
+      _ = :sys.get_state(lv.pid)
+
+      assert Process.alive?(lv.pid)
+      assert :sys.get_state(lv.pid).socket.assigns.soundings == soundings_before
+    end
+
+    test "rain_scatter mechanism surfaces for a 24 GHz contact with heavy rain pixels",
+         %{conn: conn} do
+      contact =
+        create_contact(%{
+          band: Decimal.new("24000"),
+          distance_km: Decimal.new("250")
+        })
+
+      Repo.insert!(%ContactCommonVolumeRadar{
+        contact_id: contact.id,
+        observed_at: contact.qso_timestamp,
+        common_volume_km2: 15_000.0,
+        pixel_count: 1200,
+        rain_pixel_count: 400,
+        heavy_rain_pixel_count: 120,
+        max_dbz: 52.0,
+        mean_dbz: 35.0,
+        coverage_pct: 33.0
+      })
+
+      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
+      html = render_async(lv, 2_000)
+
+      assert html =~ "52.0 dBZ"
+      assert html =~ "Heavy-rain pixels: 120"
+      assert html =~ "Propagation Mechanism"
+    end
+
+    test "elevation profile hydrates when the SRTM stub returns a populated path",
+         %{conn: conn} do
+      Req.Test.stub(ElevationClient, fn conn ->
+        if conn.host == "api.open-meteo.com" do
+          n = 257
+          Req.Test.json(conn, %{"elevation" => List.duplicate(300.0, n)})
+        else
+          Req.Test.json(conn, [])
+        end
+      end)
+
+      contact =
+        create_contact(%{
+          band: Decimal.new("10000"),
+          pos1: %{"lat" => 32.9, "lon" => -97.0},
+          pos2: %{"lat" => 30.3, "lon" => -97.7}
+        })
+
+      Repo.insert!(%HrrrProfile{
+        valid_time: contact.qso_timestamp,
+        lat: 32.9,
+        lon: -97.0,
+        profile: [%{"pres" => 1000.0, "tmpc" => 20.0, "dwpc" => 10.0, "hght" => 100.0}],
+        hpbl_m: 1200.0,
+        pwat_mm: 25.0,
+        surface_temp_c: 20.0,
+        surface_dewpoint_c: 10.0,
+        surface_pressure_mb: 1012.0,
+        surface_refractivity: 320.0,
+        min_refractivity_gradient: -200.0,
+        ducting_detected: false
+      })
+
+      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
+      _ = render_async(lv, 2_000)
+
+      ep = :sys.get_state(lv.pid).socket.assigns.elevation_profile
+      assert ep
+      assert is_list(ep.points)
+      assert is_list(ep.ducts)
+    end
+
+    property "Scorer.composite_score always stays within [0, 100]" do
+      all_band_mhz = BandConfig.all_freqs()
+
+      check all(
+              band_mhz <- StreamData.member_of(all_band_mhz),
+              temp_c <- StreamData.float(min: -40.0, max: 50.0),
+              td_depression <- StreamData.float(min: 0.0, max: 25.0),
+              pressure_mb <- StreamData.float(min: 950.0, max: 1050.0),
+              sky_pct <- StreamData.float(min: 0.0, max: 100.0),
+              wind_kts <- StreamData.float(min: 0.0, max: 40.0),
+              grad <- StreamData.float(min: -300.0, max: 50.0),
+              pwat_mm <- StreamData.float(min: 0.0, max: 60.0),
+              month <- StreamData.integer(1..12),
+              hour <- StreamData.integer(0..23),
+              max_runs: 30
+            ) do
+        band_config = BandConfig.get(band_mhz)
+
+        conditions = %{
+          temp_f: temp_c * 9 / 5 + 32,
+          dewpoint_f: (temp_c - td_depression) * 9 / 5 + 32,
+          temp_c: temp_c,
+          dewpoint_c: temp_c - td_depression,
+          abs_humidity: max(0.1, 10.0 - td_depression * 0.3),
+          min_refractivity_gradient: grad,
+          bl_depth_m: 1000.0,
+          pressure_mb: pressure_mb,
+          prev_pressure_mb: pressure_mb,
+          sky_cover_pct: sky_pct,
+          wind_speed_kts: wind_kts,
+          rain_rate_mmhr: 0.0,
+          pwat_mm: pwat_mm,
+          month: month,
+          utc_hour: hour,
+          utc_minute: 0,
+          latitude: 32.0,
+          longitude: -97.0,
+          best_duct_band_ghz: nil,
+          bulk_richardson: nil
+        }
+
+        %{score: score} = Scorer.composite_score(conditions, band_config)
+        assert is_integer(score)
+        assert score >= 0 and score <= 100
+      end
+    end
+
+    property "obs-table sort handler round-trips for any known field",
+             %{conn: conn} do
+      contact = create_contact()
+
+      fields_pool =
+        StreamData.member_of(~w(observed_at temp_f dewpoint_f relative_humidity sea_level_pressure_mb))
+
+      check all(field <- fields_pool, max_runs: 12) do
+        {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
+        _ = render_async(lv, 2_000)
+
+        _ = render_click(lv, "sort", %{"field" => "station_name", "table" => "obs"})
+
+        _ = render_click(lv, "sort", %{"field" => field, "table" => "obs"})
+        a1 = :sys.get_state(lv.pid).socket.assigns
+        assert a1.obs_sort_by == field
+        assert a1.obs_sort_order == "asc"
+
+        _ = render_click(lv, "sort", %{"field" => field, "table" => "obs"})
+        a2 = :sys.get_state(lv.pid).socket.assigns
+        assert a2.obs_sort_order == "desc"
+
+        _ = render_click(lv, "sort", %{"field" => field, "table" => "obs"})
+        a3 = :sys.get_state(lv.pid).socket.assigns
+        assert a3.obs_sort_order == "asc"
+      end
+    end
+  end
+
+  describe "Show failure-state + enrichment-combo render branches" do
+    use ExUnitProperties
+
+    import Microwaveprop.AccountsFixtures
+
+    alias Microwaveprop.Propagation.ScoreCache
+    alias Microwaveprop.Radio.ContactCommonVolumeRadar
+    alias Microwaveprop.Terrain.TerrainProfile
+    alias Microwaveprop.Weather
+    alias Microwaveprop.Weather.HrrrProfile
+    alias Microwaveprop.Weather.SolarIndex
+    alias Microwaveprop.Weather.Sounding
+    alias Microwaveprop.Weather.SurfaceObservation
+
+    setup do
+      ScoreCache.clear()
+      :ok
+    end
+
+    test "terrain_status :failed with no terrain row falls back to the no-profile copy",
+         %{conn: conn} do
+      contact =
+        create_contact()
+        |> Ecto.Changeset.change(terrain_status: :failed)
+        |> Repo.update!()
+
+      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
+      html = render_async(lv, 2_000)
+
+      assert html =~ "No terrain profile available."
+      refute html =~ "Computing terrain profile"
+    end
+
+    test "iemre_status :failed shows the generic 'No IEMRE data' copy", %{conn: conn} do
+      contact =
+        create_contact()
+        |> Ecto.Changeset.change(iemre_status: :failed)
+        |> Repo.update!()
+
+      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
+      html = render_async(lv, 2_000)
+
+      assert html =~ "No IEMRE data available."
+      refute html =~ "Fetching IEMRE data"
+    end
+
+    test "weather_status :failed renders the empty surface-obs copy with no spinner",
+         %{conn: conn} do
+      contact =
+        create_contact()
+        |> Ecto.Changeset.change(weather_status: :failed)
+        |> Repo.update!()
+
+      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
+      html = render_async(lv, 2_000)
+
+      assert html =~ "No surface observations found nearby."
+    end
+
+    test "hrrr_status :unavailable + no NARR row shows the NARR-fallback spinner",
+         %{conn: conn} do
+      contact =
+        create_contact()
+        |> Ecto.Changeset.change(hrrr_status: :unavailable)
+        |> Repo.update!()
+
+      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
+      html = render_async(lv, 2_000)
+
+      assert html =~ "HRRR unavailable"
+      assert html =~ "fetching NARR reanalysis"
+    end
+
+    test "NARR fallback with HRRR nil renders atmospheric profile from NARR", %{conn: conn} do
+      contact =
+        create_contact(%{
+          qso_timestamp: ~U[2010-06-15 18:00:00Z],
+          pos1: %{"lat" => 32.9, "lon" => -97.0},
+          pos2: %{"lat" => 30.3, "lon" => -97.7}
+        })
+
+      Repo.insert!(%NarrProfile{
+        valid_time: ~U[2010-06-15 18:00:00Z],
+        lat: 32.9,
+        lon: -97.0,
+        profile: [%{"pres" => 850.0, "tmpc" => 14.0, "dwpc" => 10.0, "hght" => 1500.0}],
+        surface_temp_c: 24.0,
+        surface_dewpoint_c: 18.0,
+        surface_pressure_mb: 1012.0,
+        hpbl_m: 1150.0,
+        pwat_mm: 28.0,
+        surface_refractivity: 318.0,
+        min_refractivity_gradient: -55.0,
+        ducting_detected: false
+      })
+
+      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
+      html = render_async(lv, 2_000)
+
+      assert html =~ "NARR"
+      assert html =~ "Surface Temp:"
+      assert html =~ "Surface Dewpoint:"
+    end
+
+    test "radar row without HRRR still renders the mechanism block and radar summary",
+         %{conn: conn} do
+      contact = create_contact(%{band: Decimal.new("10000"), distance_km: Decimal.new("150")})
+
+      Repo.insert!(%ContactCommonVolumeRadar{
+        contact_id: contact.id,
+        observed_at: contact.qso_timestamp,
+        common_volume_km2: 14_000.0,
+        pixel_count: 900,
+        rain_pixel_count: 60,
+        heavy_rain_pixel_count: 8,
+        max_dbz: 38.0,
+        mean_dbz: 19.0,
+        coverage_pct: 6.0
+      })
+
+      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
+      html = render_async(lv, 2_000)
+
+      assert html =~ "Propagation Mechanism"
+      assert html =~ "38.0 dBZ"
+      assert html =~ "Heavy-rain pixels: 8"
+      assert html =~ "Radar coverage: 6%"
+    end
+
+    test "solar handle_async populates Solar Conditions with real SFI/Ap/Kp", %{conn: conn} do
+      contact = create_contact(%{qso_timestamp: ~U[2026-03-28 18:00:00Z]})
+
+      Repo.insert!(%SolarIndex{
+        date: ~D[2026-03-28],
+        sfi: 142.0,
+        sunspot_number: 98,
+        ap_index: 6,
+        kp_values: [1.0, 2.0, 2.7, 3.0, 1.3, 0.7, 1.0, 1.3]
+      })
+
+      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
+      html = render_async(lv, 2_000)
+
+      assert html =~ "Solar Conditions"
+      assert html =~ "142"
+      assert html =~ "98"
+      assert html =~ "2.7"
+    end
+
+    test "solar handle_async for a missing date in an internal subnet enqueues a fetch",
+         %{conn: conn} do
+      contact = create_contact(%{qso_timestamp: ~U[2026-03-28 18:00:00Z]})
+      conn = %{conn | remote_ip: {172, 56, 0, 50}}
+
+      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
+      _ = render_async(lv, 2_000)
+
+      assigns = :sys.get_state(lv.pid).socket.assigns
+      assert assigns.solar == nil
+      assert Process.alive?(lv.pid)
+    end
+
+    test "soundings-array is rendered alongside HRRR profile when both are present",
+         %{conn: conn} do
+      contact =
+        create_contact(%{
+          pos1: %{"lat" => 32.9, "lon" => -97.0},
+          pos2: %{"lat" => 30.3, "lon" => -97.7}
+        })
+
+      Repo.insert!(%HrrrProfile{
+        valid_time: contact.qso_timestamp,
+        lat: 32.9,
+        lon: -97.0,
+        profile: [%{"pres" => 1000.0, "tmpc" => 20.0, "dwpc" => 12.0, "hght" => 100.0}],
+        hpbl_m: 1100.0,
+        pwat_mm: 24.0,
+        surface_temp_c: 20.0,
+        surface_dewpoint_c: 12.0,
+        surface_pressure_mb: 1012.0,
+        surface_refractivity: 322.0,
+        min_refractivity_gradient: -90.0,
+        ducting_detected: false
+      })
+
+      {:ok, raob_station} =
+        Weather.find_or_create_station(%{
+          station_code: "KFWD",
+          station_type: "sounding",
+          name: "Fort Worth",
+          lat: 32.83,
+          lon: -97.30
+        })
+
+      Repo.insert!(
+        Sounding.changeset(%Sounding{}, %{
+          station_id: raob_station.id,
+          observed_at: ~U[2026-03-28 12:00:00Z],
+          profile: [
+            %{"pres" => 1000.0, "tmpc" => 22.0, "dwpc" => 18.0, "hght" => 100.0},
+            %{"pres" => 950.0, "tmpc" => 24.0, "dwpc" => 5.0, "hght" => 600.0}
+          ],
+          level_count: 2,
+          surface_temp_c: 22.0,
+          surface_dewpoint_c: 18.0,
+          surface_refractivity: 345.0,
+          ducting_detected: true,
+          duct_characteristics: [%{"base" => 100.0, "top" => 400.0, "strength" => 8.0}]
+        })
+      )
+
+      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
+      html = render_async(lv, 2_000)
+
+      assert html =~ "HRRR"
+      assert html =~ "KFWD"
+      assert html =~ "345"
+    end
+
+    test "BLOCKED terrain without an elevation profile uses the generic obstructed copy",
+         %{conn: conn} do
+      contact =
+        create_contact(%{
+          pos1: %{"lat" => 32.9, "lon" => -97.0},
+          pos2: %{"lat" => 30.3, "lon" => -97.7}
+        })
+
+      Repo.insert!(%HrrrProfile{
+        valid_time: contact.qso_timestamp,
+        lat: 32.9,
+        lon: -97.0,
+        profile: [%{"pres" => 1000.0, "tmpc" => 20.0, "dwpc" => 10.0, "hght" => 100.0}],
+        hpbl_m: 1200.0,
+        pwat_mm: 22.0,
+        surface_temp_c: 20.0,
+        surface_dewpoint_c: 10.0,
+        surface_pressure_mb: 1010.0,
+        surface_refractivity: 320.0,
+        min_refractivity_gradient: -50.0,
+        ducting_detected: false
+      })
+
+      Repo.insert!(%TerrainProfile{
+        contact_id: contact.id,
+        sample_count: 100,
+        path_points: [%{"lat" => 32.9, "lon" => -97.0, "dist_km" => 0.0, "elev" => 200.0}],
+        max_elevation_m: 800.0,
+        min_clearance_m: -10.0,
+        diffraction_db: 10.0,
+        fresnel_hit_count: 1,
+        obstructed_count: 1,
+        verdict: "BLOCKED"
+      })
+
+      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
+      html = render_async(lv, 2_000)
+
+      assert html =~ "Path is terrain-obstructed"
+    end
+
+    test "FRESNEL_MINOR verdict via elevation profile drives the describe-verdict branch",
+         %{conn: conn} do
+      Req.Test.stub(ElevationClient, fn conn ->
+        if conn.host == "api.open-meteo.com" do
+          Req.Test.json(conn, %{"elevation" => List.duplicate(250.0, 257)})
+        else
+          Req.Test.json(conn, [])
+        end
+      end)
+
+      contact =
+        create_contact(%{
+          pos1: %{"lat" => 32.9, "lon" => -97.0},
+          pos2: %{"lat" => 30.3, "lon" => -97.7}
+        })
+
+      Repo.insert!(%TerrainProfile{
+        contact_id: contact.id,
+        sample_count: 100,
+        path_points: [%{"lat" => 32.9, "lon" => -97.0, "dist_km" => 0.0, "elev" => 250.0}],
+        max_elevation_m: 260.0,
+        min_clearance_m: 30.0,
+        diffraction_db: 0.0,
+        fresnel_hit_count: 0,
+        obstructed_count: 0,
+        verdict: "CLEAR"
+      })
+
+      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
+      _ = render_async(lv, 2_000)
+
+      ep = :sys.get_state(lv.pid).socket.assigns.elevation_profile
+
+      if ep do
+        assert is_binary(ep.verdict)
+      end
+
+      assert render(lv) =~ "Propagation Mechanism"
+    end
+
+    test "2304 MHz band with elevated PWAT hits the 10 GHz band_summary branch",
+         %{conn: conn} do
+      contact =
+        create_contact(%{
+          band: Decimal.new("2304"),
+          pos1: %{"lat" => 32.9, "lon" => -97.0},
+          pos2: %{"lat" => 30.3, "lon" => -97.7}
+        })
+
+      Repo.insert!(%HrrrProfile{
+        valid_time: contact.qso_timestamp,
+        lat: 32.9,
+        lon: -97.0,
+        profile: [%{"pres" => 1000.0, "tmpc" => 22.0, "dwpc" => 18.0, "hght" => 100.0}],
+        hpbl_m: 1100.0,
+        pwat_mm: 32.0,
+        surface_temp_c: 22.0,
+        surface_dewpoint_c: 18.0,
+        surface_pressure_mb: 1012.0,
+        surface_refractivity: 345.0,
+        min_refractivity_gradient: -90.0,
+        ducting_detected: false
+      })
+
+      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
+      html = render_async(lv, 2_000)
+
+      assert html =~ "At 10 GHz, the elevated moisture"
+    end
+
+    test "47 GHz band with elevated PWAT hits the 24G-and-up absorption copy",
+         %{conn: conn} do
+      contact =
+        create_contact(%{
+          band: Decimal.new("47000"),
+          pos1: %{"lat" => 32.9, "lon" => -97.0},
+          pos2: %{"lat" => 30.3, "lon" => -97.7}
+        })
+
+      Repo.insert!(%HrrrProfile{
+        valid_time: contact.qso_timestamp,
+        lat: 32.9,
+        lon: -97.0,
+        profile: [%{"pres" => 1000.0, "tmpc" => 20.0, "dwpc" => 15.0, "hght" => 100.0}],
+        hpbl_m: 1200.0,
+        pwat_mm: 30.0,
+        surface_temp_c: 20.0,
+        surface_dewpoint_c: 15.0,
+        surface_pressure_mb: 1012.0,
+        surface_refractivity: 330.0,
+        min_refractivity_gradient: -60.0,
+        ducting_detected: false
+      })
+
+      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
+      html = render_async(lv, 2_000)
+
+      assert html =~ "high moisture"
+      assert html =~ "water vapor absorption"
+    end
+
+    test "144 MHz band falls through every band_summary clause (no moisture copy)",
+         %{conn: conn} do
+      contact =
+        create_contact(%{
+          band: Decimal.new("144"),
+          pos1: %{"lat" => 32.9, "lon" => -97.0},
+          pos2: %{"lat" => 30.3, "lon" => -97.7}
+        })
+
+      Repo.insert!(%HrrrProfile{
+        valid_time: contact.qso_timestamp,
+        lat: 32.9,
+        lon: -97.0,
+        profile: [%{"pres" => 1000.0, "tmpc" => 10.0, "dwpc" => -5.0, "hght" => 100.0}],
+        hpbl_m: 800.0,
+        pwat_mm: 8.0,
+        surface_temp_c: 10.0,
+        surface_dewpoint_c: -5.0,
+        surface_pressure_mb: 1015.0,
+        surface_refractivity: 290.0,
+        min_refractivity_gradient: -30.0,
+        ducting_detected: false
+      })
+
+      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
+      html = render_async(lv, 2_000)
+      refute html =~ "At 10 GHz, the elevated moisture"
+      refute html =~ "water vapor absorption"
+      assert html =~ "144 MHz"
+    end
+
+    test "1296 MHz band renders through the analysis without 10 GHz copy",
+         %{conn: conn} do
+      contact =
+        create_contact(%{
+          band: Decimal.new("1296"),
+          pos1: %{"lat" => 32.9, "lon" => -97.0},
+          pos2: %{"lat" => 30.3, "lon" => -97.7}
+        })
+
+      Repo.insert!(%HrrrProfile{
+        valid_time: contact.qso_timestamp,
+        lat: 32.9,
+        lon: -97.0,
+        profile: [%{"pres" => 1000.0, "tmpc" => 10.0, "dwpc" => 0.0, "hght" => 100.0}],
+        hpbl_m: 800.0,
+        pwat_mm: 10.0,
+        surface_temp_c: 10.0,
+        surface_dewpoint_c: 0.0,
+        surface_pressure_mb: 1015.0,
+        surface_refractivity: 300.0,
+        min_refractivity_gradient: -40.0,
+        ducting_detected: false
+      })
+
+      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
+      html = render_async(lv, 2_000)
+
+      assert html =~ "1296 MHz"
+      refute html =~ "At 10 GHz, the elevated moisture"
+    end
+
+    test "75 GHz + low PWAT skips the moisture narrative", %{conn: conn} do
+      contact =
+        create_contact(%{
+          band: Decimal.new("75000"),
+          pos1: %{"lat" => 32.9, "lon" => -97.0},
+          pos2: %{"lat" => 30.3, "lon" => -97.7}
+        })
+
+      Repo.insert!(%HrrrProfile{
+        valid_time: contact.qso_timestamp,
+        lat: 32.9,
+        lon: -97.0,
+        profile: [%{"pres" => 1000.0, "tmpc" => 5.0, "dwpc" => -15.0, "hght" => 100.0}],
+        hpbl_m: 700.0,
+        pwat_mm: 5.0,
+        surface_temp_c: 5.0,
+        surface_dewpoint_c: -15.0,
+        surface_pressure_mb: 1020.0,
+        surface_refractivity: 280.0,
+        min_refractivity_gradient: -30.0,
+        ducting_detected: false
+      })
+
+      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
+      html = render_async(lv, 2_000)
+
+      assert html =~ "75 GHz"
+      refute html =~ "water vapor absorption"
+    end
+
+    test "admin edit with proposed == %{} (no-op submit) surfaces 'No changes detected'",
+         %{conn: conn} do
+      contact = create_contact()
+      admin = user_fixture() |> Ecto.Changeset.change(is_admin: true) |> Repo.update!()
+      conn = log_in_user(conn, admin)
+
+      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
+      render_click(lv, "toggle_edit", %{})
+
+      html =
+        render_submit(lv, "submit_edit", %{
+          "edit" => %{
+            "station1" => contact.station1,
+            "station2" => contact.station2,
+            "grid1" => contact.grid1,
+            "grid2" => contact.grid2,
+            "mode" => contact.mode,
+            "band" => Decimal.to_string(contact.band)
+          }
+        })
+
+      assert html =~ "No changes detected"
+    end
+
+    test "admin edit changing mode to FT8 applies the update", %{conn: conn} do
+      contact = create_contact(%{mode: "CW"})
+      admin = user_fixture() |> Ecto.Changeset.change(is_admin: true) |> Repo.update!()
+      conn = log_in_user(conn, admin)
+
+      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
+      render_click(lv, "toggle_edit", %{})
+
+      html =
+        render_submit(lv, "submit_edit", %{
+          "edit" => %{
+            "station1" => contact.station1,
+            "station2" => contact.station2,
+            "grid1" => contact.grid1,
+            "grid2" => contact.grid2,
+            "mode" => "FT8"
+          }
+        })
+
+      assert html =~ "Contact updated"
+      assert Repo.get!(Contact, contact.id).mode == "FT8"
+    end
+
+    test "admin edit changing mode to SSB applies the update", %{conn: conn} do
+      contact = create_contact(%{mode: "CW"})
+      admin = user_fixture() |> Ecto.Changeset.change(is_admin: true) |> Repo.update!()
+      conn = log_in_user(conn, admin)
+
+      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
+      render_click(lv, "toggle_edit", %{})
+
+      _html =
+        render_submit(lv, "submit_edit", %{
+          "edit" => %{
+            "station1" => contact.station1,
+            "station2" => contact.station2,
+            "grid1" => contact.grid1,
+            "grid2" => contact.grid2,
+            "mode" => "SSB"
+          }
+        })
+
+      assert Repo.get!(Contact, contact.id).mode == "SSB"
+    end
+
+    test "sort handler returns a sorted list of the same length for a seeded obs set",
+         %{conn: conn} do
+      contact = create_contact(%{qso_timestamp: ~U[2026-03-28 18:00:00Z]})
+
+      for code <- ~w(KDFW KDAL KAFW KGKY) do
+        {:ok, station} =
+          Weather.find_or_create_station(%{
+            station_code: code,
+            station_type: "asos",
+            name: "#{code} Airport",
+            lat: 32.9,
+            lon: -97.02
+          })
+
+        Repo.insert!(
+          SurfaceObservation.changeset(%SurfaceObservation{}, %{
+            station_id: station.id,
+            observed_at: contact.qso_timestamp,
+            temp_f: 60.0 + :rand.uniform() * 20,
+            dewpoint_f: 40.0 + :rand.uniform() * 20,
+            relative_humidity: 50.0,
+            sea_level_pressure_mb: 1014.0
+          })
+        )
+      end
+
+      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
+      _ = render_async(lv, 2_000)
+
+      before = length(:sys.get_state(lv.pid).socket.assigns.surface_observations)
+
+      for f <-
+            ~w(station_name observed_at temp_f dewpoint_f relative_humidity sea_level_pressure_mb bogus_key) do
+        html = render_click(lv, "sort", %{"field" => f, "table" => "obs"})
+        assert html =~ "Surface Observations"
+
+        after_count = length(:sys.get_state(lv.pid).socket.assigns.surface_observations)
+        assert after_count == before, "row count changed after sorting by #{f}"
+      end
+    end
+
+    test "fetch_queue_counts returns a map after seeding multiple distinct queues",
+         %{conn: conn} do
+      alias Microwaveprop.Workers.SolarIndexWorker
+      alias Microwaveprop.Workers.TerrainProfileWorker
+
+      contact = create_contact()
+
+      {:ok, _} =
+        Oban.insert(SolarIndexWorker.new(%{"date" => Date.to_iso8601(~D[2026-03-28])}))
+
+      {:ok, _} =
+        Oban.insert(TerrainProfileWorker.new(%{"contact_id" => contact.id}))
+
+      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
+      counts = :sys.get_state(lv.pid).socket.assigns.queue_counts
+
+      assert is_map(counts)
+
+      for {k, v} <- counts do
+        assert is_binary(k)
+        assert is_integer(v) and v >= 0
+      end
+    end
+
+    test "LV stays alive after render_async completes with no DB rows at all",
+         %{conn: conn} do
+      contact = create_contact()
+      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
+      _ = render_async(lv, 2_000)
+
+      assigns = :sys.get_state(lv.pid).socket.assigns
+      assert Process.alive?(lv.pid)
+      assert MapSet.size(assigns.hydration_pending) == 0
+    end
+
+    property "propagation_mechanism-derived summary stays a binary across random flag combos",
+             %{conn: conn} do
+      bool_gen = StreamData.boolean()
+
+      check all(
+              ducting? <- bool_gen,
+              enhanced? <- bool_gen,
+              blocked? <- bool_gen,
+              long_path? <- bool_gen,
+              max_runs: 10
+            ) do
+        dist = if long_path?, do: Decimal.new("200"), else: Decimal.new("50")
+
+        nonce = System.unique_integer([:positive])
+        lat1 = 32.0 + nonce / 1_000_000
+        iter_valid_time = DateTime.add(~U[2026-03-28 18:00:00Z], nonce, :second)
+
+        contact =
+          create_contact(%{
+            band: Decimal.new("10000"),
+            qso_timestamp: iter_valid_time,
+            pos1: %{"lat" => lat1, "lon" => -97.0},
+            pos2: %{"lat" => 30.3, "lon" => -97.7},
+            distance_km: dist
+          })
+
+        Repo.insert!(%HrrrProfile{
+          valid_time: contact.qso_timestamp,
+          lat: lat1,
+          lon: -97.0,
+          profile: [%{"pres" => 1000.0, "tmpc" => 20.0, "dwpc" => 12.0, "hght" => 100.0}],
+          hpbl_m: 1200.0,
+          pwat_mm: 22.0,
+          surface_temp_c: 20.0,
+          surface_dewpoint_c: 12.0,
+          surface_pressure_mb: 1012.0,
+          surface_refractivity: 320.0,
+          min_refractivity_gradient: if(enhanced?, do: -150.0, else: -40.0),
+          ducting_detected: ducting?
+        })
+
+        Repo.insert!(%TerrainProfile{
+          contact_id: contact.id,
+          sample_count: 100,
+          path_points: [%{"lat" => 32.9, "lon" => -97.0, "dist_km" => 0.0, "elev" => 200.0}],
+          max_elevation_m: if(blocked?, do: 800.0, else: 400.0),
+          min_clearance_m: if(blocked?, do: -20.0, else: 40.0),
+          diffraction_db: if(blocked?, do: 15.0, else: 0.0),
+          fresnel_hit_count: 0,
+          obstructed_count: if(blocked?, do: 2, else: 0),
+          verdict: if(blocked?, do: "BLOCKED", else: "CLEAR")
+        })
+
+        {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
+        _ = render_async(lv, 2_000)
+
+        analysis = :sys.get_state(lv.pid).socket.assigns.propagation_analysis
+        assert is_map(analysis)
+        assert is_binary(analysis.summary)
+        assert is_list(analysis.details)
+        assert Enum.all?(analysis.details, &is_binary/1)
+      end
+    end
+
+    property "sort-observations handler keeps the assign as a list of stable length",
+             %{conn: conn} do
+      contact = create_contact(%{qso_timestamp: ~U[2026-03-28 18:00:00Z]})
+
+      {:ok, station} =
+        Weather.find_or_create_station(%{
+          station_code: "KDFW",
+          station_type: "asos",
+          name: "DFW Airport",
+          lat: 32.9,
+          lon: -97.02
+        })
+
+      for i <- 1..3 do
+        Repo.insert!(
+          SurfaceObservation.changeset(%SurfaceObservation{}, %{
+            station_id: station.id,
+            observed_at: DateTime.add(contact.qso_timestamp, i * 60, :second),
+            temp_f: 60.0 + i,
+            dewpoint_f: 45.0 + i,
+            relative_humidity: 55.0,
+            sea_level_pressure_mb: 1014.0
+          })
+        )
+      end
+
+      gen_field =
+        StreamData.one_of([
+          StreamData.member_of(~w(station_name observed_at temp_f dewpoint_f relative_humidity sea_level_pressure_mb)),
+          StreamData.string(:alphanumeric, min_length: 1, max_length: 8)
+        ])
+
+      check all(fields <- StreamData.list_of(gen_field, min_length: 1, max_length: 5), max_runs: 10) do
+        {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
+        _ = render_async(lv, 2_000)
+
+        baseline = length(:sys.get_state(lv.pid).socket.assigns.surface_observations)
+
+        for f <- fields do
+          render_click(lv, "sort", %{"field" => f, "table" => "obs"})
+          obs = :sys.get_state(lv.pid).socket.assigns.surface_observations
+          assert is_list(obs)
+          assert length(obs) == baseline, "sorting by #{inspect(f)} changed row count"
+        end
+      end
+    end
+  end
+
+  describe "Show ordering and proximity helpers" do
+    use ExUnitProperties
+
+    alias Microwaveprop.Geo
+    alias Microwaveprop.Weather
+    alias Microwaveprop.Weather.Sounding
+    alias Microwaveprop.Weather.SurfaceObservation
+
+    defp seed_distinct_obs(contact) do
+      Enum.map(
+        [
+          {"KAAA", 32.90, -97.00, 60.0, 40.0, 50.0, 1010.0, 0},
+          {"KBBB", 32.91, -97.01, 62.0, 42.0, 52.0, 1011.0, 60},
+          {"KCCC", 32.92, -97.02, 64.0, 44.0, 54.0, 1012.0, 120},
+          {"KDDD", 32.93, -97.03, 66.0, 46.0, 56.0, 1013.0, 180}
+        ],
+        fn {code, lat, lon, temp, dewp, rh, pres, offset} ->
+          {:ok, station} =
+            Weather.find_or_create_station(%{
+              station_code: code,
+              station_type: "asos",
+              name: "#{code} Airport",
+              lat: lat,
+              lon: lon
+            })
+
+          Repo.insert!(
+            SurfaceObservation.changeset(%SurfaceObservation{}, %{
+              station_id: station.id,
+              observed_at: DateTime.add(contact.qso_timestamp, offset, :second),
+              temp_f: temp,
+              dewpoint_f: dewp,
+              relative_humidity: rh,
+              sea_level_pressure_mb: pres
+            })
+          )
+
+          code
+        end
+      )
+    end
+
+    test "sort_observations orders by station_name ascending and descending", %{conn: conn} do
+      contact = create_contact(%{qso_timestamp: ~U[2026-03-28 18:00:00Z]})
+      codes = seed_distinct_obs(contact)
+
+      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
+      _ = render_async(lv, 2_000)
+
+      _ = render_click(lv, "sort", %{"field" => "observed_at", "table" => "obs"})
+
+      _ = render_click(lv, "sort", %{"field" => "station_name", "table" => "obs"})
+
+      asc_codes =
+        lv.pid
+        |> :sys.get_state()
+        |> Map.fetch!(:socket)
+        |> Map.fetch!(:assigns)
+        |> Map.fetch!(:surface_observations)
+        |> Enum.map(& &1.station.station_code)
+
+      assert asc_codes == Enum.sort(codes)
+
+      _ = render_click(lv, "sort", %{"field" => "station_name", "table" => "obs"})
+
+      desc_codes =
+        lv.pid
+        |> :sys.get_state()
+        |> Map.fetch!(:socket)
+        |> Map.fetch!(:assigns)
+        |> Map.fetch!(:surface_observations)
+        |> Enum.map(& &1.station.station_code)
+
+      assert desc_codes == Enum.sort(codes, :desc)
+    end
+
+    test "sort_observations orders by observed_at, temp_f, dewpoint_f, relative_humidity, and pressure",
+         %{conn: conn} do
+      contact = create_contact(%{qso_timestamp: ~U[2026-03-28 18:00:00Z]})
+      _ = seed_distinct_obs(contact)
+
+      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
+      _ = render_async(lv, 2_000)
+
+      check_field = fn field, reader ->
+        _ = render_click(lv, "sort", %{"field" => field, "table" => "obs"})
+
+        obs =
+          lv.pid
+          |> :sys.get_state()
+          |> Map.fetch!(:socket)
+          |> Map.fetch!(:assigns)
+          |> Map.fetch!(:surface_observations)
+
+        values = Enum.map(obs, reader)
+
+        assert values == Enum.sort(values),
+               "obs not ascending on #{field}: #{inspect(values)}"
+      end
+
+      check_field.("observed_at", & &1.observed_at)
+      check_field.("temp_f", & &1.temp_f)
+      check_field.("dewpoint_f", & &1.dewpoint_f)
+      check_field.("relative_humidity", & &1.relative_humidity)
+      check_field.("sea_level_pressure_mb", & &1.sea_level_pressure_mb)
+    end
+
+    defp seed_distinct_soundings(contact) do
+      Enum.map(
+        [
+          {"KAAAS", 15.0, 310.0, 20.0, -2.0, 0},
+          {"KBBBS", 18.0, 315.0, 25.0, -1.0, 3600},
+          {"KCCCS", 21.0, 320.0, 30.0, 0.0, 7200}
+        ],
+        fn {code, temp, refr, k, li, offset} ->
+          {:ok, station} =
+            Weather.find_or_create_station(%{
+              station_code: code,
+              station_type: "sounding",
+              name: "#{code} Sounding",
+              lat: 32.9 + :rand.uniform() * 0.001,
+              lon: -97.0 + :rand.uniform() * 0.001
+            })
+
+          Repo.insert!(
+            Sounding.changeset(%Sounding{}, %{
+              station_id: station.id,
+              observed_at: DateTime.add(contact.qso_timestamp, offset, :second),
+              profile: [%{"pres" => 1000.0, "tmpc" => temp, "dwpc" => temp - 5.0, "hght" => 100.0}],
+              level_count: 1,
+              surface_temp_c: temp,
+              surface_dewpoint_c: temp - 5.0,
+              surface_refractivity: refr,
+              k_index: k,
+              lifted_index: li
+            })
+          )
+
+          code
+        end
+      )
+    end
+
+    test "sort_soundings orders by every known sounding field", %{conn: conn} do
+      contact = create_contact(%{qso_timestamp: ~U[2026-03-28 18:00:00Z]})
+      _ = seed_distinct_soundings(contact)
+
+      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
+      _ = render_async(lv, 2_000)
+
+      _ = render_click(lv, "sort", %{"field" => "observed_at", "table" => "soundings"})
+      _ = render_click(lv, "sort", %{"field" => "station_name", "table" => "soundings"})
+
+      station_names =
+        lv.pid
+        |> :sys.get_state()
+        |> Map.fetch!(:socket)
+        |> Map.fetch!(:assigns)
+        |> Map.fetch!(:soundings)
+        |> Enum.map(&(&1.station.name || &1.station.station_code))
+
+      assert station_names == Enum.sort(station_names)
+
+      check_field = fn field, reader ->
+        _ = render_click(lv, "sort", %{"field" => field, "table" => "soundings"})
+
+        rows =
+          lv.pid
+          |> :sys.get_state()
+          |> Map.fetch!(:socket)
+          |> Map.fetch!(:assigns)
+          |> Map.fetch!(:soundings)
+
+        values = Enum.map(rows, reader)
+
+        assert values == Enum.sort(values),
+               "soundings not ascending on #{field}: #{inspect(values)}"
+      end
+
+      check_field.("observed_at", & &1.observed_at)
+      check_field.("surface_temp_c", & &1.surface_temp_c)
+      check_field.("surface_refractivity", & &1.surface_refractivity)
+      check_field.("k_index", & &1.k_index)
+      check_field.("lifted_index", & &1.lifted_index)
+    end
+
+    test "closest_observations/4 keeps only the five nearest by midpoint distance", %{conn: conn} do
+      contact = create_contact(%{qso_timestamp: ~U[2026-03-28 18:00:00Z]})
+      mid_lat = (32.9 + 30.3) / 2
+      mid_lon = (-97.0 + -97.7) / 2
+
+      near_to_far = [
+        {"KMID0", mid_lat, mid_lon},
+        {"KMID1", mid_lat + 0.05, mid_lon + 0.05},
+        {"KMID2", mid_lat - 0.05, mid_lon - 0.05},
+        {"KMID3", mid_lat + 0.10, mid_lon + 0.10},
+        {"KMID4", mid_lat - 0.10, mid_lon - 0.10},
+        {"KMID5", mid_lat + 0.20, mid_lon + 0.20},
+        {"KMID6", mid_lat - 0.20, mid_lon - 0.20}
+      ]
+
+      _ =
+        Enum.map(near_to_far, fn {code, lat, lon} ->
+          {:ok, station} =
+            Weather.find_or_create_station(%{
+              station_code: code,
+              station_type: "asos",
+              name: "#{code}",
+              lat: lat,
+              lon: lon
+            })
+
+          Repo.insert!(
+            SurfaceObservation.changeset(%SurfaceObservation{}, %{
+              station_id: station.id,
+              observed_at: contact.qso_timestamp,
+              temp_f: 70.0,
+              dewpoint_f: 55.0,
+              relative_humidity: 55.0,
+              sea_level_pressure_mb: 1015.0
+            })
+          )
+        end)
+
+      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
+      _ = render_async(lv, 2_000)
+
+      obs =
+        lv.pid
+        |> :sys.get_state()
+        |> Map.fetch!(:socket)
+        |> Map.fetch!(:assigns)
+        |> Map.fetch!(:surface_observations)
+
+      assert length(obs) <= 5
+
+      distances =
+        Enum.map(obs, fn o ->
+          abs(o.station.lat - mid_lat) + abs(o.station.lon - mid_lon)
+        end)
+
+      assert distances == Enum.sort(distances)
+    end
+
+    test "contact with pos1 but nil pos2 renders without blowing up (half_dist = 0 path)",
+         %{conn: conn} do
+      contact = create_contact()
+
+      {:ok, contact} =
+        contact
+        |> Ecto.Changeset.change(pos2: nil, grid2: nil, distance_km: nil)
+        |> Repo.update()
+
+      assert is_nil(contact.pos2)
+
+      {:ok, lv, html} = live(conn, ~p"/contacts/#{contact.id}")
+      _ = render_async(lv, 2_000)
+
+      assert html =~ "W5XD"
+      assert Process.alive?(lv.pid)
+    end
+
+    property "sort_observations/3 preserves list length + element set for any field key",
+             %{conn: conn} do
+      contact = create_contact(%{qso_timestamp: ~U[2026-03-28 18:00:00Z]})
+      codes = seed_distinct_obs(contact)
+
+      fields_gen =
+        StreamData.one_of([
+          StreamData.member_of(~w(station_name observed_at temp_f dewpoint_f relative_humidity sea_level_pressure_mb)),
+          StreamData.string(:alphanumeric, min_length: 1, max_length: 6)
+        ])
+
+      check all(fields <- StreamData.list_of(fields_gen, min_length: 1, max_length: 5), max_runs: 10) do
+        {:ok, lv, _} = live(conn, ~p"/contacts/#{contact.id}")
+        _ = render_async(lv, 2_000)
+
+        for f <- fields do
+          _ = render_click(lv, "sort", %{"field" => f, "table" => "obs"})
+
+          obs =
+            lv.pid
+            |> :sys.get_state()
+            |> Map.fetch!(:socket)
+            |> Map.fetch!(:assigns)
+            |> Map.fetch!(:surface_observations)
+
+          assert length(obs) == length(codes)
+          assert Enum.sort(Enum.map(obs, & &1.station.station_code)) == Enum.sort(codes)
+        end
+      end
+    end
+
+    property "haversine_km/4 is symmetric: d(a,b,c,d) == d(c,d,a,b)" do
+      check all(
+              lat1 <- StreamData.float(min: -89.0, max: 89.0),
+              lon1 <- StreamData.float(min: -179.0, max: 179.0),
+              lat2 <- StreamData.float(min: -89.0, max: 89.0),
+              lon2 <- StreamData.float(min: -179.0, max: 179.0)
+            ) do
+        ab = Geo.haversine_km(lat1, lon1, lat2, lon2)
+        ba = Geo.haversine_km(lat2, lon2, lat1, lon1)
+        assert_in_delta ab, ba, 1.0e-6
+      end
+    end
+  end
+end
diff --git a/test/microwaveprop_web/live/contact_live/show_hydration_test.exs b/test/microwaveprop_web/live/contact_live/show_hydration_test.exs
new file mode 100644
index 00000000..b6b5ec55
--- /dev/null
+++ b/test/microwaveprop_web/live/contact_live/show_hydration_test.exs
@@ -0,0 +1,679 @@
+defmodule MicrowavepropWeb.ContactLive.ShowHydrationTest do
+  use MicrowavepropWeb.ConnCase, async: true
+
+  import Phoenix.LiveViewTest
+
+  alias Microwaveprop.Radio.Contact
+  alias Microwaveprop.Repo
+  alias Microwaveprop.Terrain.ElevationClient
+  alias Microwaveprop.Weather.HrrrNativeProfile
+  alias Microwaveprop.Weather.NarrProfile
+
+  setup do
+    Req.Test.stub(ElevationClient, fn conn ->
+      Req.Test.json(conn, [])
+    end)
+
+    Req.Test.stub(Microwaveprop.Weather.HrrrClient, fn conn ->
+      Plug.Conn.send_resp(conn, 404, "not found")
+    end)
+
+    Req.Test.stub(Microwaveprop.Weather.SolarClient, fn conn ->
+      Req.Test.text(conn, "")
+    end)
+
+    :ok
+  end
+
+  defp create_contact(attrs \\ %{}) do
+    default = %{
+      station1: "W5XD",
+      station2: "K5TR",
+      qso_timestamp: ~U[2026-03-28 18:00:00Z],
+      mode: "CW",
+      band: Decimal.new("1296"),
+      grid1: "EM12",
+      grid2: "EM00",
+      pos1: %{"lat" => 32.9, "lon" => -97.0},
+      pos2: %{"lat" => 30.3, "lon" => -97.7},
+      distance_km: Decimal.new("295")
+    }
+
+    merged = Map.merge(default, attrs)
+    {user_id, changeset_attrs} = Map.pop(merged, :user_id)
+
+    {:ok, contact} =
+      %Contact{user_id: user_id}
+      |> Contact.changeset(changeset_attrs)
+      |> Repo.insert()
+
+    contact
+  end
+
+  describe "Show fully-hydrated render paths" do
+    alias Microwaveprop.Propagation.ScoreCache
+    alias Microwaveprop.Radio.ContactCommonVolumeRadar
+    alias Microwaveprop.Terrain.TerrainProfile
+    alias Microwaveprop.Weather
+    alias Microwaveprop.Weather.HrrrProfile
+    alias Microwaveprop.Weather.IemreObservation
+    alias Microwaveprop.Weather.Sounding
+    alias Microwaveprop.Weather.SurfaceObservation
+
+    defp seed_fully_hydrated do
+      contact =
+        create_contact(%{
+          pos1: %{"lat" => 32.9, "lon" => -97.0},
+          pos2: %{"lat" => 30.3, "lon" => -97.7}
+        })
+
+      _ =
+        Repo.insert!(%HrrrProfile{
+          valid_time: contact.qso_timestamp,
+          lat: 32.9,
+          lon: -97.0,
+          profile: [
+            %{"pres" => 1000.0, "tmpc" => 20.0, "dwpc" => 12.0, "hght" => 100.0},
+            %{"pres" => 925.0, "tmpc" => 15.0, "dwpc" => 10.0, "hght" => 800.0},
+            %{"pres" => 850.0, "tmpc" => 10.0, "dwpc" => 5.0, "hght" => 1500.0}
+          ],
+          hpbl_m: 1200.0,
+          pwat_mm: 25.0,
+          surface_temp_c: 20.0,
+          surface_dewpoint_c: 12.0,
+          surface_pressure_mb: 1012.0,
+          surface_refractivity: 320.0,
+          min_refractivity_gradient: -120.0,
+          ducting_detected: false
+        })
+
+      _ =
+        Repo.insert!(%TerrainProfile{
+          contact_id: contact.id,
+          sample_count: 100,
+          path_points: [%{"km" => 0.0, "elev_m" => 200.0}, %{"km" => 295.0, "elev_m" => 250.0}],
+          max_elevation_m: 450.0,
+          min_clearance_m: 20.0,
+          diffraction_db: 6.5,
+          fresnel_hit_count: 3,
+          obstructed_count: 1,
+          verdict: "CLEAR"
+        })
+
+      _ =
+        Repo.insert!(%ContactCommonVolumeRadar{
+          contact_id: contact.id,
+          observed_at: contact.qso_timestamp,
+          common_volume_km2: 12_000.0,
+          pixel_count: 500,
+          rain_pixel_count: 5,
+          heavy_rain_pixel_count: 0,
+          max_dbz: 22.0,
+          mean_dbz: 12.0,
+          coverage_pct: 1.0
+        })
+
+      {:ok, station} =
+        Weather.find_or_create_station(%{
+          station_code: "KDFW",
+          station_type: "asos",
+          name: "DFW Airport",
+          lat: 32.9,
+          lon: -97.02
+        })
+
+      Repo.insert!(
+        SurfaceObservation.changeset(%SurfaceObservation{}, %{
+          station_id: station.id,
+          observed_at: contact.qso_timestamp,
+          temp_f: 72.0,
+          dewpoint_f: 55.0,
+          relative_humidity: 55.0,
+          sea_level_pressure_mb: 1015.0
+        })
+      )
+
+      {:ok, raob_station} =
+        Weather.find_or_create_station(%{
+          station_code: "KFWD",
+          station_type: "sounding",
+          name: "Fort Worth",
+          lat: 32.83,
+          lon: -97.30
+        })
+
+      Repo.insert!(
+        Sounding.changeset(%Sounding{}, %{
+          station_id: raob_station.id,
+          observed_at: ~U[2026-03-28 12:00:00Z],
+          profile: [
+            %{"pres" => 1000.0, "tmpc" => 20.0, "dwpc" => 15.0, "hght" => 100.0},
+            %{"pres" => 850.0, "tmpc" => 12.0, "dwpc" => 8.0, "hght" => 1500.0}
+          ],
+          level_count: 2,
+          surface_temp_c: 20.0,
+          surface_dewpoint_c: 15.0
+        })
+      )
+
+      _ =
+        Repo.insert!(%IemreObservation{
+          date: ~D[2026-03-28],
+          lat: 31.625,
+          lon: -97.375,
+          hourly: [
+            %{"utc_hour" => 18, "air_temp_f" => 70.0, "dew_point_f" => 55.0, "skyc_pct" => 30.0}
+          ]
+        })
+
+      contact
+    end
+
+    setup do
+      ScoreCache.clear()
+      :ok
+    end
+
+    test "fully populated contact renders every enrichment section", %{conn: conn} do
+      contact = seed_fully_hydrated()
+
+      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
+      html = render_async(lv, 2_000)
+
+      assert html =~ contact.station1
+      assert html =~ "Atmospheric Profile"
+      assert html =~ "Surface Observations"
+      assert html =~ "Soundings"
+      assert html =~ "1200"
+      assert html =~ "Line of sight is clear"
+    end
+
+    test "handle_info :terrain_ready refreshes the terrain section", %{conn: conn} do
+      contact = seed_fully_hydrated()
+
+      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
+      _ = render_async(lv, 2_000)
+
+      send(lv.pid, {:terrain_ready, contact.id})
+      html = render(lv)
+      assert html =~ contact.station1
+    end
+
+    test "handle_info ignores terrain_ready for unrelated contact", %{conn: conn} do
+      contact = seed_fully_hydrated()
+
+      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
+      _ = render_async(lv, 2_000)
+
+      send(lv.pid, {:terrain_ready, Ecto.UUID.generate()})
+      assert Process.alive?(lv.pid)
+    end
+
+    test "handle_info :sounding_fetched rehydrates the soundings table", %{conn: conn} do
+      contact = seed_fully_hydrated()
+
+      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
+      _ = render_async(lv, 2_000)
+
+      send(lv.pid, {:sounding_fetched, %{contact_id: contact.id}})
+      html = render(lv)
+      assert html =~ "Soundings"
+    end
+
+    test "handle_info :sounding_fetched for a different contact is a no-op", %{conn: conn} do
+      contact = seed_fully_hydrated()
+
+      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
+      _ = render_async(lv, 2_000)
+
+      send(lv.pid, {:sounding_fetched, %{contact_id: Ecto.UUID.generate()}})
+      assert Process.alive?(lv.pid)
+    end
+
+    test "flagged_invalid contact shows the Flagged invalid badge", %{conn: conn} do
+      contact = create_contact()
+
+      {:ok, contact} =
+        contact
+        |> Ecto.Changeset.change(flagged_invalid: true)
+        |> Repo.update()
+
+      {:ok, _lv, html} = live(conn, ~p"/contacts/#{contact.id}")
+      assert html =~ "Flagged invalid"
+      assert html =~ "line-through"
+    end
+
+    test "owner sees an Edit button (not Suggest Edit) for their own contact", %{conn: conn} do
+      import Microwaveprop.AccountsFixtures
+
+      owner = user_fixture()
+
+      {:ok, contact} =
+        %Contact{}
+        |> Contact.changeset(%{
+          station1: owner.callsign,
+          station2: "K5TR",
+          qso_timestamp: ~U[2026-03-28 18:00:00Z],
+          mode: "CW",
+          band: Decimal.new("1296"),
+          grid1: "EM12",
+          grid2: "EM00",
+          pos1: %{"lat" => 32.9, "lon" => -97.0},
+          pos2: %{"lat" => 30.3, "lon" => -97.7},
+          distance_km: Decimal.new("295"),
+          user_submitted: true,
+          submitter_email: owner.email
+        })
+        |> Ecto.Changeset.change(user_id: owner.id)
+        |> Repo.insert()
+
+      conn = log_in_user(conn, owner)
+      {:ok, _lv, html} = live(conn, ~p"/contacts/#{contact.id}")
+
+      assert html =~ ">\n                Edit\n              </button>" or html =~ "Edit"
+      refute html =~ "Suggest Edit"
+    end
+  end
+
+  describe "Show render-branch coverage" do
+    use ExUnitProperties
+
+    alias Microwaveprop.Propagation.ScoreCache
+    alias Microwaveprop.Radio.ContactCommonVolumeRadar
+    alias Microwaveprop.Radio.ContactEdit
+    alias Microwaveprop.Terrain.TerrainProfile
+    alias Microwaveprop.Weather
+    alias Microwaveprop.Weather.HrrrProfile
+    alias Microwaveprop.Weather.IemreObservation
+    alias Microwaveprop.Weather.Sounding
+    alias Microwaveprop.Weather.SurfaceObservation
+
+    defp seed_contact_with_overrides(opts \\ []) do
+      contact_overrides = Keyword.get(opts, :contact, %{})
+      terrain_overrides = Keyword.get(opts, :terrain, %{})
+      hrrr_overrides = Keyword.get(opts, :hrrr, %{})
+
+      contact =
+        create_contact(
+          Map.merge(
+            %{
+              pos1: %{"lat" => 32.9, "lon" => -97.0},
+              pos2: %{"lat" => 30.3, "lon" => -97.7}
+            },
+            contact_overrides
+          )
+        )
+
+      hrrr_row =
+        Map.merge(
+          %{
+            valid_time: contact.qso_timestamp,
+            lat: 32.9,
+            lon: -97.0,
+            profile: [
+              %{"pres" => 1000.0, "tmpc" => 20.0, "dwpc" => 12.0, "hght" => 100.0},
+              %{"pres" => 850.0, "tmpc" => 10.0, "dwpc" => 5.0, "hght" => 1500.0}
+            ],
+            hpbl_m: 1200.0,
+            pwat_mm: 25.0,
+            surface_temp_c: 20.0,
+            surface_dewpoint_c: 12.0,
+            surface_pressure_mb: 1012.0,
+            surface_refractivity: 320.0,
+            min_refractivity_gradient: -120.0,
+            ducting_detected: false
+          },
+          hrrr_overrides
+        )
+
+      Repo.insert!(struct!(HrrrProfile, hrrr_row))
+
+      terrain_row =
+        Map.merge(
+          %{
+            contact_id: contact.id,
+            sample_count: 100,
+            path_points: [%{"lat" => 32.9, "lon" => -97.0, "dist_km" => 0.0, "elev" => 200.0}],
+            max_elevation_m: 450.0,
+            min_clearance_m: 20.0,
+            diffraction_db: 6.5,
+            fresnel_hit_count: 0,
+            obstructed_count: 0,
+            verdict: "CLEAR"
+          },
+          terrain_overrides
+        )
+
+      Repo.insert!(struct!(TerrainProfile, terrain_row))
+
+      contact
+    end
+
+    setup do
+      ScoreCache.clear()
+      :ok
+    end
+
+    test "IEMRE section renders nearest-hour temperature and dew point", %{conn: conn} do
+      contact = create_contact()
+
+      Repo.insert!(%IemreObservation{
+        date: DateTime.to_date(contact.qso_timestamp),
+        lat: 32.875,
+        lon: -97.0,
+        hourly: [
+          %{
+            "utc_hour" => 18,
+            "air_temp_f" => 73.4,
+            "dew_point_f" => 54.3,
+            "skyc_%" => 42.0,
+            "uwnd_mps" => 3.0,
+            "vwnd_mps" => 4.0,
+            "hourly_precip_in" => 0.0
+          }
+        ]
+      })
+
+      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
+      html = render_async(lv, 2_000)
+
+      assert html =~ "IEMRE Gridded Reanalysis"
+      assert html =~ "73.4"
+      assert html =~ "54.3"
+    end
+
+    test "IEMRE section shows 'unavailable' status when marked as such", %{conn: conn} do
+      contact =
+        create_contact()
+        |> Ecto.Changeset.change(iemre_status: :unavailable)
+        |> Repo.update!()
+
+      {:ok, _lv, html} = live(conn, ~p"/contacts/#{contact.id}")
+      assert html =~ "IEMRE data unavailable for this contact."
+    end
+
+    test "BLOCKED terrain verdict shows the obstruction badge class", %{conn: conn} do
+      contact =
+        seed_contact_with_overrides(
+          terrain: %{
+            verdict: "BLOCKED",
+            obstructed_count: 4,
+            fresnel_hit_count: 2,
+            diffraction_db: 18.2
+          }
+        )
+
+      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
+      html = render_async(lv, 2_000)
+
+      assert html =~ "BLOCKED"
+      assert html =~ "badge-error"
+      assert html =~ "obstructed"
+    end
+
+    test "FRESNEL_MINOR terrain verdict renders with warning styling", %{conn: conn} do
+      contact = seed_contact_with_overrides(terrain: %{verdict: "FRESNEL_MINOR"})
+
+      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
+      html = render_async(lv, 2_000)
+
+      assert html =~ "FRESNEL_MINOR"
+      assert html =~ "badge-warning"
+    end
+
+    test "FRESNEL_PARTIAL terrain verdict renders with warning styling", %{conn: conn} do
+      contact = seed_contact_with_overrides(terrain: %{verdict: "FRESNEL_PARTIAL"})
+
+      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
+      html = render_async(lv, 2_000)
+
+      assert html =~ "FRESNEL_PARTIAL"
+      assert html =~ "badge-warning"
+    end
+
+    test "expanded terrain table renders all path points", %{conn: conn} do
+      contact =
+        seed_contact_with_overrides(
+          terrain: %{
+            verdict: "CLEAR",
+            path_points: [
+              %{"lat" => 32.9, "lon" => -97.0, "dist_km" => 0.0, "elev" => 200.0},
+              %{"lat" => 31.6, "lon" => -97.35, "dist_km" => 147.5, "elev" => 320.0},
+              %{"lat" => 30.3, "lon" => -97.7, "dist_km" => 295.0, "elev" => 250.0}
+            ]
+          }
+        )
+
+      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
+      _ = render_async(lv, 2_000)
+
+      html = render_click(lv, "toggle_terrain", %{})
+      assert html =~ "Dist (km)"
+    end
+
+    test "Propagation Analysis renders factor rows and composite tier label", %{conn: conn} do
+      contact = seed_contact_with_overrides()
+
+      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
+      html = render_async(lv, 2_000)
+
+      assert html =~ "Propagation Analysis"
+      assert html =~ "Contribution"
+      assert html =~ "Humidity"
+      assert html =~ "/100"
+
+      assert html =~ "EXCELLENT" or html =~ "GOOD" or html =~ "MARGINAL" or
+               html =~ "POOR" or html =~ "NEGLIGIBLE"
+    end
+
+    test "Data Sources card renders HRRR, Terrain, and Elevation blocks", %{conn: conn} do
+      contact = seed_contact_with_overrides()
+
+      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
+      html = render_async(lv, 2_000)
+
+      assert html =~ "Data Sources"
+      assert html =~ "HRRR Model"
+      assert html =~ "Terrain Analysis"
+      assert html =~ "Elevation Profile"
+    end
+
+    test "internal-network conn kicks off enqueue path and transitions pending status", %{conn: conn} do
+      contact = create_contact()
+
+      conn = %{conn | remote_ip: {172, 56, 0, 1}}
+
+      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
+      _ = render_async(lv, 2_000)
+
+      assert Process.alive?(lv.pid)
+      assert render(lv) =~ contact.station1
+    end
+
+    test "radar row surfaces max_dbz and coverage_pct in the mechanism block", %{conn: conn} do
+      contact = create_contact()
+
+      Repo.insert!(%ContactCommonVolumeRadar{
+        contact_id: contact.id,
+        observed_at: contact.qso_timestamp,
+        common_volume_km2: 12_500.0,
+        pixel_count: 800,
+        rain_pixel_count: 150,
+        heavy_rain_pixel_count: 25,
+        max_dbz: 47.5,
+        mean_dbz: 22.3,
+        coverage_pct: 18.0
+      })
+
+      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
+      html = render_async(lv, 2_000)
+
+      assert html =~ "Propagation Mechanism"
+      assert html =~ "47.5 dBZ"
+      assert html =~ "Heavy-rain pixels: 25"
+    end
+
+    test "non-owner with a pending edit sees the pending-edit banner", %{conn: conn} do
+      import Microwaveprop.AccountsFixtures
+
+      contact = create_contact()
+      stranger = user_fixture()
+
+      Repo.insert!(%ContactEdit{
+        contact_id: contact.id,
+        user_id: stranger.id,
+        proposed_changes: %{"station2" => "K9EDIT"},
+        status: :pending
+      })
+
+      conn = log_in_user(conn, stranger)
+      {:ok, _lv, html} = live(conn, ~p"/contacts/#{contact.id}")
+
+      assert html =~ "pending edit for this contact awaiting admin review"
+    end
+
+    test "full Atmospheric Profile block renders surface temp/dewpoint/pressure", %{conn: conn} do
+      contact = seed_contact_with_overrides()
+
+      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
+      html = render_async(lv, 2_000)
+
+      assert html =~ "Surface Temp:"
+      assert html =~ "Surface Dewpoint:"
+      assert html =~ "Surface Pressure:"
+    end
+
+    test "soundings-empty state shows the 1000 km fallback copy", %{conn: conn} do
+      contact = create_contact()
+      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
+      html = render_async(lv, 2_000)
+
+      assert html =~ "No soundings found within 1000 km."
+    end
+
+    test "surface-observations queued status shows spinner copy", %{conn: conn} do
+      contact =
+        create_contact()
+        |> Ecto.Changeset.change(weather_status: :queued)
+        |> Repo.update!()
+
+      {:ok, _lv, html} = live(conn, ~p"/contacts/#{contact.id}")
+
+      assert html =~ "Fetching surface observations" or html =~ "Surface Observations"
+    end
+
+    test "ducting detected on the HRRR profile shows the Ducting badge", %{conn: conn} do
+      contact =
+        seed_contact_with_overrides(
+          hrrr: %{
+            ducting_detected: true,
+            min_refractivity_gradient: -200.0
+          }
+        )
+
+      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
+      html = render_async(lv, 2_000)
+
+      assert html =~ "Ducting"
+    end
+
+    test "sounding row with a real station shows the ducting detection badge", %{conn: conn} do
+      contact = create_contact()
+
+      {:ok, station} =
+        Weather.find_or_create_station(%{
+          station_code: "KFWD",
+          station_type: "sounding",
+          name: "Fort Worth",
+          lat: 32.83,
+          lon: -97.30
+        })
+
+      Repo.insert!(
+        Sounding.changeset(%Sounding{}, %{
+          station_id: station.id,
+          observed_at: ~U[2026-03-28 12:00:00Z],
+          profile: [
+            %{"pres" => 1000.0, "tmpc" => 20.0, "dwpc" => 15.0, "hght" => 100.0},
+            %{"pres" => 850.0, "tmpc" => 12.0, "dwpc" => 8.0, "hght" => 1500.0}
+          ],
+          level_count: 2,
+          surface_temp_c: 20.0,
+          surface_dewpoint_c: 15.0,
+          surface_refractivity: 340.0,
+          ducting_detected: true
+        })
+      )
+
+      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
+      html = render_async(lv, 2_000)
+
+      assert html =~ "KFWD"
+      assert html =~ "Ducting"
+    end
+
+    property "obs-table sort handler is total over every known field and direction", %{conn: conn} do
+      contact = create_contact(%{station1: "W5PROP", qso_timestamp: ~U[2026-03-28 18:00:00Z]})
+
+      {:ok, station} =
+        Weather.find_or_create_station(%{
+          station_code: "KDFW",
+          station_type: "asos",
+          name: "DFW Airport",
+          lat: 32.9,
+          lon: -97.02
+        })
+
+      Repo.insert!(
+        SurfaceObservation.changeset(%SurfaceObservation{}, %{
+          station_id: station.id,
+          observed_at: contact.qso_timestamp,
+          temp_f: 70.0,
+          dewpoint_f: 55.0,
+          relative_humidity: 55.0,
+          sea_level_pressure_mb: 1015.0
+        })
+      )
+
+      known_fields =
+        ~w(station_name observed_at temp_f dewpoint_f relative_humidity sea_level_pressure_mb zzz_unknown)
+
+      field_stream = StreamData.member_of(known_fields)
+      sequence_gen = StreamData.list_of(field_stream, min_length: 1, max_length: 6)
+
+      check all(fields <- sequence_gen, max_runs: 15) do
+        {:ok, lv, _} = live(conn, ~p"/contacts/#{contact.id}")
+        _ = render_async(lv, 2_000)
+
+        for f <- fields do
+          html = render_click(lv, "sort", %{"field" => f, "table" => "obs"})
+          assert html =~ "Surface Observations", "sort by #{f} lost the obs table"
+        end
+
+        assert Process.alive?(lv.pid)
+      end
+    end
+
+    property "soundings-table sort handler tolerates arbitrary field keys", %{conn: conn} do
+      contact = create_contact(%{qso_timestamp: ~U[2026-03-28 18:00:00Z]})
+
+      fields_pool =
+        ~w(station_name observed_at surface_temp_c surface_refractivity k_index lifted_index unknown)
+
+      sequence_gen =
+        StreamData.list_of(StreamData.member_of(fields_pool), min_length: 1, max_length: 4)
+
+      check all(fields <- sequence_gen, max_runs: 10) do
+        {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
+        _ = render_async(lv, 2_000)
+
+        for f <- fields do
+          html = render_click(lv, "sort", %{"field" => f, "table" => "soundings"})
+          assert html =~ "Soundings", "sort by #{f} lost the soundings section"
+        end
+
+        assert Process.alive?(lv.pid)
+      end
+    end
+  end
+end
diff --git a/test/microwaveprop_web/live/contact_live/show_test.exs b/test/microwaveprop_web/live/contact_live/show_test.exs
new file mode 100644
index 00000000..dad9ef9c
--- /dev/null
+++ b/test/microwaveprop_web/live/contact_live/show_test.exs
@@ -0,0 +1,568 @@
+defmodule MicrowavepropWeb.ContactLive.ShowTest do
+  use MicrowavepropWeb.ConnCase, async: true
+
+  import Phoenix.LiveViewTest
+
+  alias Microwaveprop.Radio.Contact
+  alias Microwaveprop.Repo
+  alias Microwaveprop.Terrain.ElevationClient
+  alias Microwaveprop.Weather.HrrrNativeProfile
+  alias Microwaveprop.Weather.NarrProfile
+
+  setup do
+    Req.Test.stub(ElevationClient, fn conn ->
+      Req.Test.json(conn, [])
+    end)
+
+    Req.Test.stub(Microwaveprop.Weather.HrrrClient, fn conn ->
+      Plug.Conn.send_resp(conn, 404, "not found")
+    end)
+
+    Req.Test.stub(Microwaveprop.Weather.SolarClient, fn conn ->
+      Req.Test.text(conn, "")
+    end)
+
+    :ok
+  end
+
+  defp create_contact(attrs \\ %{}) do
+    default = %{
+      station1: "W5XD",
+      station2: "K5TR",
+      qso_timestamp: ~U[2026-03-28 18:00:00Z],
+      mode: "CW",
+      band: Decimal.new("1296"),
+      grid1: "EM12",
+      grid2: "EM00",
+      pos1: %{"lat" => 32.9, "lon" => -97.0},
+      pos2: %{"lat" => 30.3, "lon" => -97.7},
+      distance_km: Decimal.new("295")
+    }
+
+    merged = Map.merge(default, attrs)
+    {user_id, changeset_attrs} = Map.pop(merged, :user_id)
+
+    {:ok, contact} =
+      %Contact{user_id: user_id}
+      |> Contact.changeset(changeset_attrs)
+      |> Repo.insert()
+
+    contact
+  end
+
+  describe "Show private visibility" do
+    import Microwaveprop.AccountsFixtures
+
+    test "anonymous viewer 404s on a private contact", %{conn: conn} do
+      contact = create_contact(%{private: true})
+
+      assert_raise Ecto.NoResultsError, fn ->
+        live(conn, ~p"/contacts/#{contact.id}")
+      end
+    end
+
+    test "non-owning user 404s on a private contact", %{conn: conn} do
+      owner = user_fixture()
+      other = user_fixture()
+      contact = create_contact(%{private: true, user_id: owner.id})
+      conn = log_in_user(conn, other)
+
+      assert_raise Ecto.NoResultsError, fn ->
+        live(conn, ~p"/contacts/#{contact.id}")
+      end
+    end
+
+    test "owner can view their own private contact", %{conn: conn} do
+      owner = user_fixture()
+      contact = create_contact(%{private: true, user_id: owner.id})
+      conn = log_in_user(conn, owner)
+
+      {:ok, _lv, html} = live(conn, ~p"/contacts/#{contact.id}")
+      assert html =~ "W5XD"
+    end
+
+    test "admin can view anyone's private contact", %{conn: conn} do
+      owner = user_fixture()
+      admin = user_fixture() |> Ecto.Changeset.change(is_admin: true) |> Repo.update!()
+      contact = create_contact(%{private: true, user_id: owner.id})
+      conn = log_in_user(conn, admin)
+
+      {:ok, _lv, html} = live(conn, ~p"/contacts/#{contact.id}")
+      assert html =~ "W5XD"
+    end
+  end
+
+  describe "Show" do
+    test "renders contact detail fields", %{conn: conn} do
+      contact = create_contact()
+
+      {:ok, _lv, html} = live(conn, ~p"/contacts/#{contact.id}")
+      assert html =~ "W5XD"
+      assert html =~ "K5TR"
+      assert html =~ "2026-03-28"
+    end
+
+    test "shows surface observations section", %{conn: conn} do
+      contact = create_contact()
+      {:ok, _lv, html} = live(conn, ~p"/contacts/#{contact.id}")
+      assert html =~ "Surface Observations"
+    end
+
+    test "shows sounding section", %{conn: conn} do
+      contact = create_contact()
+      {:ok, _lv, html} = live(conn, ~p"/contacts/#{contact.id}")
+      assert html =~ "Soundings"
+    end
+
+    test "shows solar index section", %{conn: conn} do
+      contact = create_contact()
+      {:ok, _lv, html} = live(conn, ~p"/contacts/#{contact.id}")
+      assert html =~ "Solar Conditions"
+    end
+
+    test "renders with sort assigns", %{conn: conn} do
+      contact = create_contact()
+      {:ok, lv, html} = live(conn, ~p"/contacts/#{contact.id}")
+
+      assert html =~ "Surface Observations"
+      assert html =~ "Soundings"
+
+      assert render(lv) =~ contact.station1
+    end
+
+    test "renders sub-10-GHz bands in MHz", %{conn: conn} do
+      contact = create_contact(%{band: Decimal.new("432")})
+      {:ok, _lv, html} = live(conn, ~p"/contacts/#{contact.id}")
+      assert html =~ "432 MHz"
+    end
+
+    test "renders 50 MHz in MHz", %{conn: conn} do
+      contact = create_contact(%{band: Decimal.new("50")})
+      {:ok, _lv, html} = live(conn, ~p"/contacts/#{contact.id}")
+      assert html =~ "50 MHz"
+    end
+
+    test "renders 1296 MHz in MHz", %{conn: conn} do
+      contact = create_contact(%{band: Decimal.new("1296")})
+      {:ok, _lv, html} = live(conn, ~p"/contacts/#{contact.id}")
+      assert html =~ "1296 MHz"
+      refute html =~ "1.3 GHz"
+    end
+
+    test "renders 2304 MHz in MHz", %{conn: conn} do
+      contact = create_contact(%{band: Decimal.new("2304")})
+      {:ok, _lv, html} = live(conn, ~p"/contacts/#{contact.id}")
+      assert html =~ "2304 MHz"
+      refute html =~ "2.3 GHz"
+    end
+
+    test "renders 10 GHz in GHz (threshold)", %{conn: conn} do
+      contact = create_contact(%{band: Decimal.new("10000")})
+      {:ok, _lv, html} = live(conn, ~p"/contacts/#{contact.id}")
+      assert html =~ "10 GHz"
+    end
+
+    test "renders 24 GHz in GHz", %{conn: conn} do
+      contact = create_contact(%{band: Decimal.new("24000")})
+      {:ok, _lv, html} = live(conn, ~p"/contacts/#{contact.id}")
+      assert html =~ "24 GHz"
+    end
+
+    test "raises for bad UUID", %{conn: conn} do
+      assert_raise Ecto.NoResultsError, fn ->
+        live(conn, ~p"/contacts/#{Ecto.UUID.generate()}")
+      end
+    end
+
+    test "shows atmospheric profile section with NARR source for pre-HRRR contact", %{conn: conn} do
+      contact =
+        create_contact(%{
+          qso_timestamp: ~U[2010-06-15 18:00:00Z],
+          pos1: %{"lat" => 32.9, "lon" => -97.0},
+          pos2: %{"lat" => 30.3, "lon" => -97.7}
+        })
+
+      {:ok, _} =
+        Repo.insert(%NarrProfile{
+          valid_time: ~U[2010-06-15 18:00:00Z],
+          lat: 33.0,
+          lon: -97.0,
+          profile: [
+            %{"pres" => 850.0, "tmpc" => 15.0, "dwpc" => 10.0, "hght" => 1500.0}
+          ],
+          surface_temp_c: 25.0,
+          surface_dewpoint_c: 18.0,
+          surface_pressure_mb: 1012.0,
+          hpbl_m: 1200.0,
+          pwat_mm: 30.0,
+          surface_refractivity: 320.0,
+          min_refractivity_gradient: -50.0,
+          ducting_detected: false
+        })
+
+      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
+
+      html = render_async(lv, 2_000)
+      assert html =~ "Atmospheric Profile"
+      assert html =~ "NARR"
+      assert html =~ "1200"
+      assert html =~ "33.0"
+    end
+
+    test "skew-T uses native HRRR profile when backfilled", %{conn: conn} do
+      contact =
+        create_contact(%{
+          qso_timestamp: ~U[2024-06-15 18:00:00Z],
+          pos1: %{"lat" => 32.9, "lon" => -97.0},
+          pos2: %{"lat" => 30.3, "lon" => -97.7}
+        })
+
+      {:ok, _} =
+        Repo.insert(%NarrProfile{
+          valid_time: ~U[2024-06-15 18:00:00Z],
+          lat: 32.9,
+          lon: -97.0,
+          profile: [%{"pres" => 850.0, "tmpc" => 15.0, "dwpc" => 10.0, "hght" => 1500.0}],
+          surface_temp_c: 25.0,
+          surface_dewpoint_c: 18.0,
+          surface_pressure_mb: 1012.0,
+          hpbl_m: 1200.0,
+          pwat_mm: 30.0,
+          surface_refractivity: 320.0,
+          min_refractivity_gradient: -50.0,
+          ducting_detected: false
+        })
+
+      {:ok, _} =
+        %HrrrNativeProfile{}
+        |> HrrrNativeProfile.changeset(%{
+          valid_time: ~U[2024-06-15 18:00:00Z],
+          run_time: ~U[2024-06-15 18:00:00Z],
+          lat: 32.9,
+          lon: -97.0,
+          level_count: 3,
+          heights_m: [10.0, 1500.0, 9500.0],
+          temp_k: [298.0, 288.0, 228.0],
+          spfh: [0.012, 0.006, 0.0001],
+          pressure_pa: [101_000.0, 85_000.0, 30_000.0],
+          u_wind_ms: [2.0, 5.0, 20.0],
+          v_wind_ms: [1.0, 2.0, 5.0],
+          tke_m2s2: [0.5, 0.2, 0.05]
+        })
+        |> Repo.insert()
+
+      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
+      html = render_async(lv, 2_000)
+
+      assert html =~ "HRRR native"
+      assert html =~ "300.0"
+    end
+  end
+
+  describe "Show interactive events" do
+    import Microwaveprop.AccountsFixtures
+
+    defp admin_fixture do
+      user = user_fixture()
+      {:ok, user} = Microwaveprop.Accounts.admin_update_user(user, %{is_admin: true})
+      user
+    end
+
+    test "toggle_hrrr_profile flips the atmospheric-profile collapse state", %{conn: conn} do
+      contact = create_contact()
+      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
+
+      before_html = render(lv)
+      toggled = render_click(lv, "toggle_hrrr_profile", %{})
+      back = render_click(lv, "toggle_hrrr_profile", %{})
+
+      assert is_binary(toggled)
+      assert is_binary(back)
+      assert back =~ contact.station1 and before_html =~ contact.station1
+    end
+
+    test "toggle_terrain flips the terrain-section collapse state", %{conn: conn} do
+      contact = create_contact()
+      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
+
+      html = render_click(lv, "toggle_terrain", %{})
+      assert is_binary(html)
+    end
+
+    test "toggle_profile (sounding expansion) tracks an id in the MapSet", %{conn: conn} do
+      contact = create_contact()
+      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
+
+      html = render_click(lv, "toggle_profile", %{"id" => "11111111-1111-1111-1111-111111111111"})
+      assert is_binary(html)
+
+      html2 = render_click(lv, "toggle_profile", %{"id" => "11111111-1111-1111-1111-111111111111"})
+      assert is_binary(html2)
+    end
+
+    test "sort obs table by date toggles sort direction", %{conn: conn} do
+      contact = create_contact()
+      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
+
+      render_click(lv, "sort", %{"field" => "observed_at", "table" => "obs"})
+      html = render_click(lv, "sort", %{"field" => "observed_at", "table" => "obs"})
+      assert html =~ "Surface Observations"
+    end
+
+    test "sort obs table exercises every known field sort key", %{conn: conn} do
+      contact = create_contact()
+      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
+
+      for field <- ~w(station_name observed_at temp_f dewpoint_f relative_humidity sea_level_pressure_mb unknown_field) do
+        html = render_click(lv, "sort", %{"field" => field, "table" => "obs"})
+        assert html =~ "Surface Observations", "sort by #{field} lost the obs table"
+      end
+    end
+
+    test "sort soundings table exercises every known field sort key", %{conn: conn} do
+      contact = create_contact()
+      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
+
+      for field <- ~w(station_name observed_at unknown_field) do
+        html = render_click(lv, "sort", %{"field" => field, "table" => "soundings"})
+        assert html =~ "Soundings", "sort by #{field} lost the soundings table"
+      end
+    end
+
+    test "sort soundings table by date keeps the view rendering", %{conn: conn} do
+      contact = create_contact()
+      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
+
+      html = render_click(lv, "sort", %{"field" => "observed_at", "table" => "soundings"})
+      assert html =~ "Soundings"
+    end
+
+    test "toggle_flag is denied to anonymous viewers (flash + no change)", %{conn: conn} do
+      contact = create_contact()
+      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
+
+      html = render_click(lv, "toggle_flag", %{})
+      assert html =~ "Admins only"
+
+      refute Repo.get!(Contact, contact.id).flagged_invalid
+    end
+
+    test "toggle_flag inverts the flag for admins", %{conn: conn} do
+      contact = create_contact()
+      admin = admin_fixture()
+      conn = log_in_user(conn, admin)
+
+      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
+      render_click(lv, "toggle_flag", %{})
+
+      refreshed = Repo.get!(Contact, contact.id)
+      assert refreshed.flagged_invalid == true
+
+      render_click(lv, "toggle_flag", %{})
+      assert Repo.get!(Contact, contact.id).flagged_invalid == false
+    end
+
+    test "toggle_edit opens and closes the inline edit form", %{conn: conn} do
+      contact = create_contact()
+      admin = admin_fixture()
+      conn = log_in_user(conn, admin)
+
+      {:ok, lv, html_before} = live(conn, ~p"/contacts/#{contact.id}")
+      refute html_before =~ ~s(phx-submit="submit_edit")
+
+      html_open = render_click(lv, "toggle_edit", %{})
+      assert html_open =~ ~s(phx-submit="submit_edit")
+
+      html_closed = render_click(lv, "toggle_edit", %{})
+      refute html_closed =~ ~s(phx-submit="submit_edit")
+    end
+
+    test "submit_edit by a non-logged-in user flashes a login-required error", %{conn: conn} do
+      contact = create_contact()
+      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
+
+      html =
+        render_submit(lv, "submit_edit", %{
+          "edit" => %{"station1" => "N5XX"}
+        })
+
+      assert html =~ "logged in to edit"
+    end
+
+    test "submit_edit as admin applies a simple callsign change", %{conn: conn} do
+      contact = create_contact(%{station1: "N5OLD"})
+      admin = admin_fixture()
+      conn = log_in_user(conn, admin)
+
+      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
+      render_click(lv, "toggle_edit", %{})
+
+      html =
+        render_submit(lv, "submit_edit", %{
+          "edit" => %{
+            "station1" => "N5NEW",
+            "station2" => contact.station2,
+            "grid1" => contact.grid1,
+            "grid2" => contact.grid2,
+            "mode" => contact.mode
+          }
+        })
+
+      assert html =~ "Contact updated"
+      assert Repo.get!(Contact, contact.id).station1 == "N5NEW"
+    end
+
+    test "owner (non-admin) editing their own submitted contact routes through owner edit", %{conn: conn} do
+      owner = user_fixture()
+
+      {:ok, contact} =
+        %Contact{}
+        |> Contact.changeset(%{
+          station1: owner.callsign,
+          station2: "K5TR",
+          qso_timestamp: ~U[2026-03-28 18:00:00Z],
+          mode: "CW",
+          band: Decimal.new("1296"),
+          grid1: "EM12",
+          grid2: "EM00",
+          pos1: %{"lat" => 32.9, "lon" => -97.0},
+          pos2: %{"lat" => 30.3, "lon" => -97.7},
+          distance_km: Decimal.new("295"),
+          user_submitted: true,
+          submitter_email: owner.email
+        })
+        |> Ecto.Changeset.change(user_id: owner.id)
+        |> Repo.insert()
+
+      conn = log_in_user(conn, owner)
+
+      {:ok, lv, _} = live(conn, ~p"/contacts/#{contact.id}")
+      render_click(lv, "toggle_edit", %{})
+
+      html =
+        render_submit(lv, "submit_edit", %{
+          "edit" => %{
+            "station1" => owner.callsign,
+            "station2" => "K9NEW",
+            "grid1" => contact.grid1,
+            "grid2" => contact.grid2,
+            "mode" => contact.mode
+          }
+        })
+
+      assert html =~ "Contact updated"
+      assert Repo.get!(Contact, contact.id).station2 == "K9NEW"
+    end
+
+    test "non-owner non-admin submitting an edit creates a pending ContactEdit", %{conn: conn} do
+      contact = create_contact()
+      stranger = user_fixture()
+      conn = log_in_user(conn, stranger)
+
+      {:ok, lv, _} = live(conn, ~p"/contacts/#{contact.id}")
+      render_click(lv, "toggle_edit", %{})
+
+      html =
+        render_submit(lv, "submit_edit", %{
+          "edit" => %{
+            "station1" => contact.station1,
+            "station2" => "K9SUGGEST",
+            "grid1" => contact.grid1,
+            "grid2" => contact.grid2,
+            "mode" => contact.mode
+          }
+        })
+
+      assert Repo.get!(Contact, contact.id).station2 == contact.station2
+
+      assert Repo.aggregate(Microwaveprop.Radio.ContactEdit, :count, :id) == 1
+      assert html =~ "submitted" or html =~ "suggest" or html =~ "pending"
+    end
+
+    test "renders the contact detail with a real surface observation row", %{conn: conn} do
+      alias Microwaveprop.Weather
+      alias Microwaveprop.Weather.SurfaceObservation
+
+      contact = create_contact()
+
+      {:ok, station} =
+        Weather.find_or_create_station(%{
+          station_code: "KDFW",
+          station_type: "asos",
+          name: "DFW Airport",
+          lat: 32.90,
+          lon: -97.02
+        })
+
+      {:ok, _} =
+        %SurfaceObservation{}
+        |> SurfaceObservation.changeset(%{
+          station_id: station.id,
+          observed_at: ~U[2026-03-28 18:00:00Z],
+          temp_f: 72.0,
+          dewpoint_f: 55.0,
+          relative_humidity: 55.0,
+          sea_level_pressure_mb: 1015.0
+        })
+        |> Repo.insert()
+
+      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
+
+      html = render_async(lv, 2_000)
+      assert html =~ "Surface Observations"
+    end
+
+    test "renders the contact detail with a real sounding row", %{conn: conn} do
+      alias Microwaveprop.Weather
+      alias Microwaveprop.Weather.Sounding
+
+      contact = create_contact()
+
+      {:ok, station} =
+        Weather.find_or_create_station(%{
+          station_code: "KFWD",
+          station_type: "sounding",
+          name: "Fort Worth",
+          lat: 32.83,
+          lon: -97.30
+        })
+
+      {:ok, _} =
+        %Sounding{}
+        |> Sounding.changeset(%{
+          station_id: station.id,
+          observed_at: ~U[2026-03-28 12:00:00Z],
+          profile: [
+            %{"pres" => 1000.0, "tmpc" => 20.0, "dwpc" => 15.0, "hght" => 100.0},
+            %{"pres" => 850.0, "tmpc" => 12.0, "dwpc" => 8.0, "hght" => 1500.0}
+          ],
+          level_count: 2,
+          surface_temp_c: 20.0,
+          surface_dewpoint_c: 15.0
+        })
+        |> Repo.insert()
+
+      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
+
+      html = render_async(lv, 2_000)
+      assert html =~ "KFWD"
+    end
+
+    test "validate_edit always returns :noreply without touching the DB", %{conn: conn} do
+      contact = create_contact()
+      admin = admin_fixture()
+      conn = log_in_user(conn, admin)
+
+      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
+      render_click(lv, "toggle_edit", %{})
+
+      html =
+        render_change(lv, "validate_edit", %{
+          "edit" => %{"station1" => "N5TYPED"}
+        })
+
+      assert html =~ ~s(phx-submit="submit_edit")
+      assert Repo.get!(Contact, contact.id).station1 == "W5XD"
+    end
+  end
+end
diff --git a/test/microwaveprop_web/live/contact_live_test.exs b/test/microwaveprop_web/live/contact_live_test.exs
deleted file mode 100644
index af776b7e..00000000
--- a/test/microwaveprop_web/live/contact_live_test.exs
+++ /dev/null
@@ -1,3505 +0,0 @@
-defmodule MicrowavepropWeb.ContactLiveTest do
-  use MicrowavepropWeb.ConnCase, async: true
-
-  import Phoenix.LiveViewTest
-
-  alias Microwaveprop.Radio.Contact
-  alias Microwaveprop.Repo
-  alias Microwaveprop.Terrain.ElevationClient
-  alias Microwaveprop.Weather.HrrrNativeProfile
-  alias Microwaveprop.Weather.NarrProfile
-
-  setup do
-    Req.Test.stub(ElevationClient, fn conn ->
-      Req.Test.json(conn, [])
-    end)
-
-    Req.Test.stub(Microwaveprop.Weather.HrrrClient, fn conn ->
-      Plug.Conn.send_resp(conn, 404, "not found")
-    end)
-
-    Req.Test.stub(Microwaveprop.Weather.SolarClient, fn conn ->
-      Req.Test.text(conn, "")
-    end)
-
-    :ok
-  end
-
-  defp create_contact(attrs \\ %{}) do
-    default = %{
-      station1: "W5XD",
-      station2: "K5TR",
-      qso_timestamp: ~U[2026-03-28 18:00:00Z],
-      mode: "CW",
-      band: Decimal.new("1296"),
-      grid1: "EM12",
-      grid2: "EM00",
-      pos1: %{"lat" => 32.9, "lon" => -97.0},
-      pos2: %{"lat" => 30.3, "lon" => -97.7},
-      distance_km: Decimal.new("295")
-    }
-
-    merged = Map.merge(default, attrs)
-    {user_id, changeset_attrs} = Map.pop(merged, :user_id)
-
-    {:ok, contact} =
-      %Contact{user_id: user_id}
-      |> Contact.changeset(changeset_attrs)
-      |> Repo.insert()
-
-    contact
-  end
-
-  describe "Index" do
-    test "renders page with Contacts heading", %{conn: conn} do
-      {:ok, _lv, html} = live(conn, ~p"/contacts")
-      assert html =~ "Contacts"
-    end
-
-    test "shows total contact count in subtitle", %{conn: conn} do
-      create_contact()
-      create_contact(%{station1: "N5AC"})
-      create_contact(%{station1: "K5TR"})
-
-      {:ok, _lv, html} = live(conn, ~p"/contacts")
-      assert html =~ "3 total"
-    end
-
-    test "table shows contact data", %{conn: conn} do
-      create_contact()
-
-      {:ok, _lv, html} = live(conn, ~p"/contacts")
-      assert html =~ "W5XD"
-      assert html =~ "K5TR"
-      assert html =~ "CW"
-      assert html =~ "1296"
-    end
-
-    test "row links to detail page", %{conn: conn} do
-      contact = create_contact()
-
-      {:ok, _lv, html} = live(conn, ~p"/contacts")
-      assert html =~ ~p"/contacts/#{contact.id}"
-    end
-
-    test "sort params order the table", %{conn: conn} do
-      create_contact(%{station1: "ZZ9ZZ"})
-      create_contact(%{station1: "AA1AA"})
-
-      {:ok, _lv, html} = live(conn, ~p"/contacts?sort_params[station1]=asc")
-
-      aa_pos = html |> :binary.match("AA1AA") |> elem(0)
-      zz_pos = html |> :binary.match("ZZ9ZZ") |> elem(0)
-      assert aa_pos < zz_pos
-    end
-
-    test "search by single callsign matches either station", %{conn: conn} do
-      create_contact(%{station1: "W5LUA", station2: "W5HN"})
-      create_contact(%{station1: "K5TR", station2: "N5AC"})
-
-      {:ok, _lv, html} = live(conn, ~p"/contacts?search=W5LUA")
-      # W5LUA appears in the matching row; K5TR/N5AC should not render in
-      # the table body because the search filtered that contact out.
-      assert html =~ "W5LUA"
-      refute html =~ "N5AC"
-    end
-
-    test "pagination reaches later pages", %{conn: conn} do
-      for i <- 1..25 do
-        ts = DateTime.add(~U[2026-01-01 00:00:00Z], i * 3600, :second)
-        create_contact(%{qso_timestamp: ts, station1: "W#{i}TEST"})
-      end
-
-      {:ok, _lv, html} = live(conn, ~p"/contacts")
-      assert html =~ "Page"
-
-      {:ok, _lv, html2} = live(conn, ~p"/contacts?page=2")
-      assert html2 =~ "Page"
-    end
-
-    test "renders a per-month bar chart that sums across years", %{conn: conn} do
-      # Two March contacts in different years (2025, 2026) plus one
-      # July: chart should report Mar=2 and Jul=1.
-      create_contact(%{qso_timestamp: ~U[2025-03-15 12:00:00Z], station1: "W5MAR"})
-      create_contact(%{qso_timestamp: ~U[2026-03-22 12:00:00Z], station1: "K5MAR"})
-      create_contact(%{qso_timestamp: ~U[2026-07-10 12:00:00Z], station1: "W5JUL"})
-
-      {:ok, _lv, html} = live(conn, ~p"/contacts")
-
-      assert html =~ "Contacts by month"
-      assert html =~ ~s|data-month="3"|
-      assert html =~ ~s|data-month-count="2"|
-      assert html =~ ~s|data-month="7"|
-      assert html =~ ~s|data-month-count="1"|
-      # Months without contacts still render with a 0 count so the
-      # x-axis stays continuous.
-      assert html =~ ~s|data-month="1"|
-      assert html =~ ~s|data-month-count="0"|
-    end
-  end
-
-  describe "Index private visibility" do
-    import Microwaveprop.AccountsFixtures
-
-    test "anonymous viewer does not see private contacts in the table", %{conn: conn} do
-      _private = create_contact(%{station1: "W5PRV", private: true})
-      _public = create_contact(%{station1: "W5PUB", qso_timestamp: ~U[2026-03-28 19:00:00Z]})
-
-      {:ok, _lv, html} = live(conn, ~p"/contacts")
-
-      assert html =~ "W5PUB"
-      refute html =~ "W5PRV"
-    end
-
-    test "owner sees their own private inline with Yes badge", %{conn: conn} do
-      owner = user_fixture()
-      _private = create_contact(%{station1: "W5PRV", private: true, user_id: owner.id})
-      _public = create_contact(%{station1: "W5PUB", qso_timestamp: ~U[2026-03-28 19:00:00Z]})
-      conn = log_in_user(conn, owner)
-
-      {:ok, _lv, html} = live(conn, ~p"/contacts")
-
-      assert html =~ "W5PRV"
-      assert html =~ "W5PUB"
-      assert html =~ "badge-warning"
-    end
-
-    test "admin sees all private contacts", %{conn: conn} do
-      admin = user_fixture() |> Ecto.Changeset.change(is_admin: true) |> Repo.update!()
-      _private = create_contact(%{station1: "W5PRV", private: true})
-      _public = create_contact(%{station1: "W5PUB", qso_timestamp: ~U[2026-03-28 19:00:00Z]})
-      conn = log_in_user(conn, admin)
-
-      {:ok, _lv, html} = live(conn, ~p"/contacts")
-      assert html =~ "W5PRV"
-      assert html =~ "W5PUB"
-    end
-
-    test "non-owning user does not see others' private", %{conn: conn} do
-      owner = user_fixture()
-      viewer = user_fixture()
-      _private = create_contact(%{station1: "W5PRV", private: true, user_id: owner.id})
-      _public = create_contact(%{station1: "W5PUB", qso_timestamp: ~U[2026-03-28 19:00:00Z]})
-      conn = log_in_user(conn, viewer)
-
-      {:ok, _lv, html} = live(conn, ~p"/contacts")
-      assert html =~ "W5PUB"
-      refute html =~ "W5PRV"
-    end
-  end
-
-  describe "Index private column visibility" do
-    import Microwaveprop.AccountsFixtures
-
-    test "column hidden for anonymous viewer when no private contacts exist", %{conn: conn} do
-      _public = create_contact(%{station1: "W5PUB"})
-
-      {:ok, _lv, html} = live(conn, ~p"/contacts")
-      refute html =~ ">Private<"
-    end
-
-    test "column hidden for anonymous viewer even when others have private contacts", %{conn: conn} do
-      _private = create_contact(%{station1: "W5PRV", private: true})
-      _public = create_contact(%{station1: "W5PUB"})
-
-      {:ok, _lv, html} = live(conn, ~p"/contacts")
-      refute html =~ ">Private<"
-    end
-
-    test "column hidden for a user who has no private contacts of their own", %{conn: conn} do
-      owner = user_fixture()
-      viewer = user_fixture()
-      _others_private = create_contact(%{station1: "W5PRV", private: true, user_id: owner.id})
-      conn = log_in_user(conn, viewer)
-
-      {:ok, _lv, html} = live(conn, ~p"/contacts")
-      refute html =~ ">Private<"
-    end
-
-    test "column visible for a user with at least one of their own private contacts", %{conn: conn} do
-      owner = user_fixture()
-      _private = create_contact(%{station1: "W5PRV", private: true, user_id: owner.id})
-      conn = log_in_user(conn, owner)
-
-      {:ok, _lv, html} = live(conn, ~p"/contacts")
-      assert html =~ ">Private<"
-    end
-
-    test "column hidden for admin when there are no private contacts anywhere", %{conn: conn} do
-      admin = user_fixture() |> Ecto.Changeset.change(is_admin: true) |> Repo.update!()
-      _public = create_contact(%{station1: "W5PUB"})
-      conn = log_in_user(conn, admin)
-
-      {:ok, _lv, html} = live(conn, ~p"/contacts")
-      refute html =~ ">Private<"
-    end
-
-    test "column visible for admin as soon as any private contact exists", %{conn: conn} do
-      admin = user_fixture() |> Ecto.Changeset.change(is_admin: true) |> Repo.update!()
-      _private = create_contact(%{station1: "W5PRV", private: true})
-      conn = log_in_user(conn, admin)
-
-      {:ok, _lv, html} = live(conn, ~p"/contacts")
-      assert html =~ ">Private<"
-    end
-  end
-
-  describe "Show private visibility" do
-    import Microwaveprop.AccountsFixtures
-
-    test "anonymous viewer 404s on a private contact", %{conn: conn} do
-      contact = create_contact(%{private: true})
-
-      assert_raise Ecto.NoResultsError, fn ->
-        live(conn, ~p"/contacts/#{contact.id}")
-      end
-    end
-
-    test "non-owning user 404s on a private contact", %{conn: conn} do
-      owner = user_fixture()
-      other = user_fixture()
-      contact = create_contact(%{private: true, user_id: owner.id})
-      conn = log_in_user(conn, other)
-
-      assert_raise Ecto.NoResultsError, fn ->
-        live(conn, ~p"/contacts/#{contact.id}")
-      end
-    end
-
-    test "owner can view their own private contact", %{conn: conn} do
-      owner = user_fixture()
-      contact = create_contact(%{private: true, user_id: owner.id})
-      conn = log_in_user(conn, owner)
-
-      {:ok, _lv, html} = live(conn, ~p"/contacts/#{contact.id}")
-      assert html =~ "W5XD"
-    end
-
-    test "admin can view anyone's private contact", %{conn: conn} do
-      owner = user_fixture()
-      admin = user_fixture() |> Ecto.Changeset.change(is_admin: true) |> Repo.update!()
-      contact = create_contact(%{private: true, user_id: owner.id})
-      conn = log_in_user(conn, admin)
-
-      {:ok, _lv, html} = live(conn, ~p"/contacts/#{contact.id}")
-      assert html =~ "W5XD"
-    end
-  end
-
-  describe "Show" do
-    test "renders contact detail fields", %{conn: conn} do
-      contact = create_contact()
-
-      {:ok, _lv, html} = live(conn, ~p"/contacts/#{contact.id}")
-      assert html =~ "W5XD"
-      assert html =~ "K5TR"
-      # Mode, band, grids are shown in the elevation profile section (requires SRTM)
-      # or in the header subtitle
-      assert html =~ "2026-03-28"
-    end
-
-    test "shows surface observations section", %{conn: conn} do
-      contact = create_contact()
-      {:ok, _lv, html} = live(conn, ~p"/contacts/#{contact.id}")
-      assert html =~ "Surface Observations"
-    end
-
-    test "shows sounding section", %{conn: conn} do
-      contact = create_contact()
-      {:ok, _lv, html} = live(conn, ~p"/contacts/#{contact.id}")
-      assert html =~ "Soundings"
-    end
-
-    test "shows solar index section", %{conn: conn} do
-      contact = create_contact()
-      {:ok, _lv, html} = live(conn, ~p"/contacts/#{contact.id}")
-      assert html =~ "Solar Conditions"
-    end
-
-    test "renders with sort assigns", %{conn: conn} do
-      contact = create_contact()
-      {:ok, lv, html} = live(conn, ~p"/contacts/#{contact.id}")
-
-      # Page renders without error
-      assert html =~ "Surface Observations"
-      assert html =~ "Soundings"
-
-      # Sort assigns are initialized (no crash on render)
-      assert render(lv) =~ contact.station1
-    end
-
-    # Band display on the detail page: below 10 GHz renders in MHz, at/above
-    # 10 GHz renders in GHz. Amateur microwave convention — 2304 is "2304",
-    # 3456 is "3456", 5760 is "5760", not "2.3 GHz" etc.
-    test "renders sub-10-GHz bands in MHz", %{conn: conn} do
-      contact = create_contact(%{band: Decimal.new("432")})
-      {:ok, _lv, html} = live(conn, ~p"/contacts/#{contact.id}")
-      assert html =~ "432 MHz"
-    end
-
-    test "renders 50 MHz in MHz", %{conn: conn} do
-      contact = create_contact(%{band: Decimal.new("50")})
-      {:ok, _lv, html} = live(conn, ~p"/contacts/#{contact.id}")
-      assert html =~ "50 MHz"
-    end
-
-    test "renders 1296 MHz in MHz", %{conn: conn} do
-      contact = create_contact(%{band: Decimal.new("1296")})
-      {:ok, _lv, html} = live(conn, ~p"/contacts/#{contact.id}")
-      assert html =~ "1296 MHz"
-      refute html =~ "1.3 GHz"
-    end
-
-    test "renders 2304 MHz in MHz", %{conn: conn} do
-      contact = create_contact(%{band: Decimal.new("2304")})
-      {:ok, _lv, html} = live(conn, ~p"/contacts/#{contact.id}")
-      assert html =~ "2304 MHz"
-      refute html =~ "2.3 GHz"
-    end
-
-    test "renders 10 GHz in GHz (threshold)", %{conn: conn} do
-      contact = create_contact(%{band: Decimal.new("10000")})
-      {:ok, _lv, html} = live(conn, ~p"/contacts/#{contact.id}")
-      assert html =~ "10 GHz"
-    end
-
-    test "renders 24 GHz in GHz", %{conn: conn} do
-      contact = create_contact(%{band: Decimal.new("24000")})
-      {:ok, _lv, html} = live(conn, ~p"/contacts/#{contact.id}")
-      assert html =~ "24 GHz"
-    end
-
-    test "raises for bad UUID", %{conn: conn} do
-      assert_raise Ecto.NoResultsError, fn ->
-        live(conn, ~p"/contacts/#{Ecto.UUID.generate()}")
-      end
-    end
-
-    test "shows atmospheric profile section with NARR source for pre-HRRR contact", %{conn: conn} do
-      # Pre-2014 contact — HRRR is unavailable, NARR is the fallback source.
-      contact =
-        create_contact(%{
-          qso_timestamp: ~U[2010-06-15 18:00:00Z],
-          pos1: %{"lat" => 32.9, "lon" => -97.0},
-          pos2: %{"lat" => 30.3, "lon" => -97.7}
-        })
-
-      {:ok, _} =
-        Repo.insert(%NarrProfile{
-          valid_time: ~U[2010-06-15 18:00:00Z],
-          lat: 33.0,
-          lon: -97.0,
-          profile: [
-            %{"pres" => 850.0, "tmpc" => 15.0, "dwpc" => 10.0, "hght" => 1500.0}
-          ],
-          surface_temp_c: 25.0,
-          surface_dewpoint_c: 18.0,
-          surface_pressure_mb: 1012.0,
-          hpbl_m: 1200.0,
-          pwat_mm: 30.0,
-          surface_refractivity: 320.0,
-          min_refractivity_gradient: -50.0,
-          ducting_detected: false
-        })
-
-      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
-
-      html = render_async(lv, 2_000)
-      assert html =~ "Atmospheric Profile"
-      assert html =~ "NARR"
-      # Collapsed summary shows HPBL / PWAT / lat,lon from the injected NARR row.
-      assert html =~ "1200"
-      assert html =~ "33.0"
-    end
-
-    test "skew-T uses native HRRR profile when backfilled", %{conn: conn} do
-      # Native backfill has reached this hour — use its full-atmosphere
-      # profile for the skew-T instead of the 700 mb-capped pressure-level one.
-      contact =
-        create_contact(%{
-          qso_timestamp: ~U[2024-06-15 18:00:00Z],
-          pos1: %{"lat" => 32.9, "lon" => -97.0},
-          pos2: %{"lat" => 30.3, "lon" => -97.7}
-        })
-
-      # NARR row keeps the atmospheric profile section rendering with its
-      # aggregate metadata (HPBL / PWAT / surface scalars).
-      {:ok, _} =
-        Repo.insert(%NarrProfile{
-          valid_time: ~U[2024-06-15 18:00:00Z],
-          lat: 32.9,
-          lon: -97.0,
-          profile: [%{"pres" => 850.0, "tmpc" => 15.0, "dwpc" => 10.0, "hght" => 1500.0}],
-          surface_temp_c: 25.0,
-          surface_dewpoint_c: 18.0,
-          surface_pressure_mb: 1012.0,
-          hpbl_m: 1200.0,
-          pwat_mm: 30.0,
-          surface_refractivity: 320.0,
-          min_refractivity_gradient: -50.0,
-          ducting_detected: false
-        })
-
-      # Native profile at the same point/time. `pressure_pa: [..., 30_000.0]`
-      # corresponds to 300 mb — a level the pressure-level profile cannot
-      # cover because HRRR/NARR pressure-level data stops at 700 mb historically.
-      {:ok, _} =
-        %HrrrNativeProfile{}
-        |> HrrrNativeProfile.changeset(%{
-          valid_time: ~U[2024-06-15 18:00:00Z],
-          run_time: ~U[2024-06-15 18:00:00Z],
-          lat: 32.9,
-          lon: -97.0,
-          level_count: 3,
-          heights_m: [10.0, 1500.0, 9500.0],
-          temp_k: [298.0, 288.0, 228.0],
-          spfh: [0.012, 0.006, 0.0001],
-          pressure_pa: [101_000.0, 85_000.0, 30_000.0],
-          u_wind_ms: [2.0, 5.0, 20.0],
-          v_wind_ms: [1.0, 2.0, 5.0],
-          tke_m2s2: [0.5, 0.2, 0.05]
-        })
-        |> Repo.insert()
-
-      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
-      html = render_async(lv, 2_000)
-
-      assert html =~ "HRRR native"
-      # 300 mb comes from the native profile — pressure-level data capped at 700.
-      assert html =~ "300.0"
-    end
-  end
-
-  describe "Show interactive events" do
-    # Exercises every non-trivial handle_event branch on the detail page.
-    # These bump ContactLive.Show's line coverage considerably because
-    # the event handlers fan out into the rendering branches they
-    # control (collapse/expand sections, sort tables, owner/admin edit
-    # flow).
-
-    import Microwaveprop.AccountsFixtures
-
-    defp admin_fixture do
-      user = user_fixture()
-      {:ok, user} = Microwaveprop.Accounts.admin_update_user(user, %{is_admin: true})
-      user
-    end
-
-    test "toggle_hrrr_profile flips the atmospheric-profile collapse state", %{conn: conn} do
-      contact = create_contact()
-      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
-
-      # Firing the event twice returns us to the starting state — proves
-      # the handler is stateful and reachable.
-      before_html = render(lv)
-      toggled = render_click(lv, "toggle_hrrr_profile", %{})
-      back = render_click(lv, "toggle_hrrr_profile", %{})
-
-      assert is_binary(toggled)
-      assert is_binary(back)
-      # Back-and-forth toggle leaves the page rendering again.
-      assert back =~ contact.station1 and before_html =~ contact.station1
-    end
-
-    test "toggle_terrain flips the terrain-section collapse state", %{conn: conn} do
-      contact = create_contact()
-      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
-
-      html = render_click(lv, "toggle_terrain", %{})
-      assert is_binary(html)
-    end
-
-    test "toggle_profile (sounding expansion) tracks an id in the MapSet", %{conn: conn} do
-      contact = create_contact()
-      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
-
-      # Use a made-up id — even without a real sounding the handler path
-      # still executes (MapSet add/remove) and keeps the LV alive.
-      html = render_click(lv, "toggle_profile", %{"id" => "11111111-1111-1111-1111-111111111111"})
-      assert is_binary(html)
-
-      html2 = render_click(lv, "toggle_profile", %{"id" => "11111111-1111-1111-1111-111111111111"})
-      assert is_binary(html2)
-    end
-
-    test "sort obs table by date toggles sort direction", %{conn: conn} do
-      contact = create_contact()
-      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
-
-      render_click(lv, "sort", %{"field" => "observed_at", "table" => "obs"})
-      html = render_click(lv, "sort", %{"field" => "observed_at", "table" => "obs"})
-      assert html =~ "Surface Observations"
-    end
-
-    test "sort obs table exercises every known field sort key", %{conn: conn} do
-      contact = create_contact()
-      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
-
-      for field <- ~w(station_name observed_at temp_f dewpoint_f relative_humidity sea_level_pressure_mb unknown_field) do
-        html = render_click(lv, "sort", %{"field" => field, "table" => "obs"})
-        assert html =~ "Surface Observations", "sort by #{field} lost the obs table"
-      end
-    end
-
-    test "sort soundings table exercises every known field sort key", %{conn: conn} do
-      contact = create_contact()
-      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
-
-      for field <- ~w(station_name observed_at unknown_field) do
-        html = render_click(lv, "sort", %{"field" => field, "table" => "soundings"})
-        assert html =~ "Soundings", "sort by #{field} lost the soundings table"
-      end
-    end
-
-    test "sort soundings table by date keeps the view rendering", %{conn: conn} do
-      contact = create_contact()
-      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
-
-      html = render_click(lv, "sort", %{"field" => "observed_at", "table" => "soundings"})
-      assert html =~ "Soundings"
-    end
-
-    test "toggle_flag is denied to anonymous viewers (flash + no change)", %{conn: conn} do
-      contact = create_contact()
-      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
-
-      html = render_click(lv, "toggle_flag", %{})
-      assert html =~ "Admins only"
-
-      refute Repo.get!(Contact, contact.id).flagged_invalid
-    end
-
-    test "toggle_flag inverts the flag for admins", %{conn: conn} do
-      contact = create_contact()
-      admin = admin_fixture()
-      conn = log_in_user(conn, admin)
-
-      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
-      render_click(lv, "toggle_flag", %{})
-
-      refreshed = Repo.get!(Contact, contact.id)
-      assert refreshed.flagged_invalid == true
-
-      # Toggling again flips back.
-      render_click(lv, "toggle_flag", %{})
-      assert Repo.get!(Contact, contact.id).flagged_invalid == false
-    end
-
-    test "toggle_edit opens and closes the inline edit form", %{conn: conn} do
-      contact = create_contact()
-      admin = admin_fixture()
-      conn = log_in_user(conn, admin)
-
-      {:ok, lv, html_before} = live(conn, ~p"/contacts/#{contact.id}")
-      refute html_before =~ ~s(phx-submit="submit_edit")
-
-      html_open = render_click(lv, "toggle_edit", %{})
-      assert html_open =~ ~s(phx-submit="submit_edit")
-
-      html_closed = render_click(lv, "toggle_edit", %{})
-      refute html_closed =~ ~s(phx-submit="submit_edit")
-    end
-
-    test "submit_edit by a non-logged-in user flashes a login-required error", %{conn: conn} do
-      contact = create_contact()
-      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
-
-      html =
-        render_submit(lv, "submit_edit", %{
-          "edit" => %{"station1" => "N5XX"}
-        })
-
-      assert html =~ "logged in to edit"
-    end
-
-    test "submit_edit as admin applies a simple callsign change", %{conn: conn} do
-      # Avoid qso_timestamp and 'private' in the submitted form — both
-      # have known diff-vs-DB encoding quirks (timestamp format mismatch;
-      # false vs nil private) that would trip the admin apply path. A
-      # clean station1 change exercises apply_admin_edit/3 end-to-end.
-      contact = create_contact(%{station1: "N5OLD"})
-      admin = admin_fixture()
-      conn = log_in_user(conn, admin)
-
-      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
-      render_click(lv, "toggle_edit", %{})
-
-      html =
-        render_submit(lv, "submit_edit", %{
-          "edit" => %{
-            "station1" => "N5NEW",
-            "station2" => contact.station2,
-            "grid1" => contact.grid1,
-            "grid2" => contact.grid2,
-            "mode" => contact.mode
-          }
-        })
-
-      assert html =~ "Contact updated"
-      assert Repo.get!(Contact, contact.id).station1 == "N5NEW"
-    end
-
-    test "owner (non-admin) editing their own submitted contact routes through owner edit", %{conn: conn} do
-      owner = user_fixture()
-
-      {:ok, contact} =
-        %Contact{}
-        |> Contact.changeset(%{
-          station1: owner.callsign,
-          station2: "K5TR",
-          qso_timestamp: ~U[2026-03-28 18:00:00Z],
-          mode: "CW",
-          band: Decimal.new("1296"),
-          grid1: "EM12",
-          grid2: "EM00",
-          pos1: %{"lat" => 32.9, "lon" => -97.0},
-          pos2: %{"lat" => 30.3, "lon" => -97.7},
-          distance_km: Decimal.new("295"),
-          user_submitted: true,
-          submitter_email: owner.email
-        })
-        |> Ecto.Changeset.change(user_id: owner.id)
-        |> Repo.insert()
-
-      conn = log_in_user(conn, owner)
-
-      {:ok, lv, _} = live(conn, ~p"/contacts/#{contact.id}")
-      render_click(lv, "toggle_edit", %{})
-
-      # Owners go through apply_owner_edit/4, which directly applies the
-      # change to their own submission (no admin review needed).
-      html =
-        render_submit(lv, "submit_edit", %{
-          "edit" => %{
-            "station1" => owner.callsign,
-            "station2" => "K9NEW",
-            "grid1" => contact.grid1,
-            "grid2" => contact.grid2,
-            "mode" => contact.mode
-          }
-        })
-
-      assert html =~ "Contact updated"
-      assert Repo.get!(Contact, contact.id).station2 == "K9NEW"
-    end
-
-    test "non-owner non-admin submitting an edit creates a pending ContactEdit", %{conn: conn} do
-      contact = create_contact()
-      stranger = user_fixture()
-      conn = log_in_user(conn, stranger)
-
-      {:ok, lv, _} = live(conn, ~p"/contacts/#{contact.id}")
-      render_click(lv, "toggle_edit", %{})
-
-      html =
-        render_submit(lv, "submit_edit", %{
-          "edit" => %{
-            "station1" => contact.station1,
-            "station2" => "K9SUGGEST",
-            "grid1" => contact.grid1,
-            "grid2" => contact.grid2,
-            "mode" => contact.mode
-          }
-        })
-
-      # Stranger hits submit_user_edit/4, which queues a pending edit
-      # rather than changing the contact directly.
-      assert Repo.get!(Contact, contact.id).station2 == contact.station2
-
-      assert Repo.aggregate(Microwaveprop.Radio.ContactEdit, :count, :id) == 1
-      # Some flash confirmation goes out, exact wording may vary.
-      assert html =~ "submitted" or html =~ "suggest" or html =~ "pending"
-    end
-
-    test "renders the contact detail with a real surface observation row", %{conn: conn} do
-      alias Microwaveprop.Weather
-      alias Microwaveprop.Weather.SurfaceObservation
-
-      contact = create_contact()
-
-      {:ok, station} =
-        Weather.find_or_create_station(%{
-          station_code: "KDFW",
-          station_type: "asos",
-          name: "DFW Airport",
-          lat: 32.90,
-          lon: -97.02
-        })
-
-      {:ok, _} =
-        %SurfaceObservation{}
-        |> SurfaceObservation.changeset(%{
-          station_id: station.id,
-          observed_at: ~U[2026-03-28 18:00:00Z],
-          temp_f: 72.0,
-          dewpoint_f: 55.0,
-          relative_humidity: 55.0,
-          sea_level_pressure_mb: 1015.0
-        })
-        |> Repo.insert()
-
-      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
-
-      html = render_async(lv, 2_000)
-      # Surface Observations section is present; actual rows may or may
-      # not render depending on internal proximity/time filters. The
-      # render pass itself exercises the with-data code path either way.
-      assert html =~ "Surface Observations"
-    end
-
-    test "renders the contact detail with a real sounding row", %{conn: conn} do
-      alias Microwaveprop.Weather
-      alias Microwaveprop.Weather.Sounding
-
-      contact = create_contact()
-
-      {:ok, station} =
-        Weather.find_or_create_station(%{
-          station_code: "KFWD",
-          station_type: "sounding",
-          name: "Fort Worth",
-          lat: 32.83,
-          lon: -97.30
-        })
-
-      {:ok, _} =
-        %Sounding{}
-        |> Sounding.changeset(%{
-          station_id: station.id,
-          observed_at: ~U[2026-03-28 12:00:00Z],
-          profile: [
-            %{"pres" => 1000.0, "tmpc" => 20.0, "dwpc" => 15.0, "hght" => 100.0},
-            %{"pres" => 850.0, "tmpc" => 12.0, "dwpc" => 8.0, "hght" => 1500.0}
-          ],
-          level_count: 2,
-          surface_temp_c: 20.0,
-          surface_dewpoint_c: 15.0
-        })
-        |> Repo.insert()
-
-      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
-
-      html = render_async(lv, 2_000)
-      assert html =~ "KFWD"
-    end
-
-    test "validate_edit always returns :noreply without touching the DB", %{conn: conn} do
-      contact = create_contact()
-      admin = admin_fixture()
-      conn = log_in_user(conn, admin)
-
-      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
-      render_click(lv, "toggle_edit", %{})
-
-      html =
-        render_change(lv, "validate_edit", %{
-          "edit" => %{"station1" => "N5TYPED"}
-        })
-
-      # Still editing, contact unchanged.
-      assert html =~ ~s(phx-submit="submit_edit")
-      assert Repo.get!(Contact, contact.id).station1 == "W5XD"
-    end
-  end
-
-  describe "Show fully-hydrated render paths" do
-    # These tests seed the DB with real-ish enrichment rows for a single
-    # contact, then drive the LiveView through its async hydration so we
-    # exercise the derived-analysis helpers (refresh_computed,
-    # build_propagation_analysis, build_data_sources) and the render
-    # branches they unlock.
-
-    alias Microwaveprop.Propagation.ScoreCache
-    alias Microwaveprop.Radio.ContactCommonVolumeRadar
-    alias Microwaveprop.Terrain.TerrainProfile
-    alias Microwaveprop.Weather
-    alias Microwaveprop.Weather.HrrrProfile
-    alias Microwaveprop.Weather.IemreObservation
-    alias Microwaveprop.Weather.Sounding
-    alias Microwaveprop.Weather.SurfaceObservation
-
-    defp seed_fully_hydrated do
-      contact =
-        create_contact(%{
-          pos1: %{"lat" => 32.9, "lon" => -97.0},
-          pos2: %{"lat" => 30.3, "lon" => -97.7}
-        })
-
-      _ =
-        Repo.insert!(%HrrrProfile{
-          valid_time: contact.qso_timestamp,
-          lat: 32.9,
-          lon: -97.0,
-          profile: [
-            %{"pres" => 1000.0, "tmpc" => 20.0, "dwpc" => 12.0, "hght" => 100.0},
-            %{"pres" => 925.0, "tmpc" => 15.0, "dwpc" => 10.0, "hght" => 800.0},
-            %{"pres" => 850.0, "tmpc" => 10.0, "dwpc" => 5.0, "hght" => 1500.0}
-          ],
-          hpbl_m: 1200.0,
-          pwat_mm: 25.0,
-          surface_temp_c: 20.0,
-          surface_dewpoint_c: 12.0,
-          surface_pressure_mb: 1012.0,
-          surface_refractivity: 320.0,
-          min_refractivity_gradient: -120.0,
-          ducting_detected: false
-        })
-
-      _ =
-        Repo.insert!(%TerrainProfile{
-          contact_id: contact.id,
-          sample_count: 100,
-          path_points: [%{"km" => 0.0, "elev_m" => 200.0}, %{"km" => 295.0, "elev_m" => 250.0}],
-          max_elevation_m: 450.0,
-          min_clearance_m: 20.0,
-          diffraction_db: 6.5,
-          fresnel_hit_count: 3,
-          obstructed_count: 1,
-          verdict: "CLEAR"
-        })
-
-      _ =
-        Repo.insert!(%ContactCommonVolumeRadar{
-          contact_id: contact.id,
-          observed_at: contact.qso_timestamp,
-          common_volume_km2: 12_000.0,
-          pixel_count: 500,
-          rain_pixel_count: 5,
-          heavy_rain_pixel_count: 0,
-          max_dbz: 22.0,
-          mean_dbz: 12.0,
-          coverage_pct: 1.0
-        })
-
-      {:ok, station} =
-        Weather.find_or_create_station(%{
-          station_code: "KDFW",
-          station_type: "asos",
-          name: "DFW Airport",
-          lat: 32.9,
-          lon: -97.02
-        })
-
-      Repo.insert!(
-        SurfaceObservation.changeset(%SurfaceObservation{}, %{
-          station_id: station.id,
-          observed_at: contact.qso_timestamp,
-          temp_f: 72.0,
-          dewpoint_f: 55.0,
-          relative_humidity: 55.0,
-          sea_level_pressure_mb: 1015.0
-        })
-      )
-
-      {:ok, raob_station} =
-        Weather.find_or_create_station(%{
-          station_code: "KFWD",
-          station_type: "sounding",
-          name: "Fort Worth",
-          lat: 32.83,
-          lon: -97.30
-        })
-
-      Repo.insert!(
-        Sounding.changeset(%Sounding{}, %{
-          station_id: raob_station.id,
-          observed_at: ~U[2026-03-28 12:00:00Z],
-          profile: [
-            %{"pres" => 1000.0, "tmpc" => 20.0, "dwpc" => 15.0, "hght" => 100.0},
-            %{"pres" => 850.0, "tmpc" => 12.0, "dwpc" => 8.0, "hght" => 1500.0}
-          ],
-          level_count: 2,
-          surface_temp_c: 20.0,
-          surface_dewpoint_c: 15.0
-        })
-      )
-
-      _ =
-        Repo.insert!(%IemreObservation{
-          date: ~D[2026-03-28],
-          lat: 31.625,
-          lon: -97.375,
-          hourly: [
-            %{"utc_hour" => 18, "air_temp_f" => 70.0, "dew_point_f" => 55.0, "skyc_pct" => 30.0}
-          ]
-        })
-
-      contact
-    end
-
-    setup do
-      ScoreCache.clear()
-      :ok
-    end
-
-    test "fully populated contact renders every enrichment section", %{conn: conn} do
-      contact = seed_fully_hydrated()
-
-      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
-      html = render_async(lv, 2_000)
-
-      # Headers / enrichment labels visible when data is present.
-      assert html =~ contact.station1
-      assert html =~ "Atmospheric Profile"
-      assert html =~ "Surface Observations"
-      assert html =~ "Soundings"
-      # HRRR metadata exposed by build_hrrr_source.
-      assert html =~ "1200"
-      # Terrain verdict surfaced by terrain_summary.
-      assert html =~ "Line of sight is clear"
-    end
-
-    test "handle_info :terrain_ready refreshes the terrain section", %{conn: conn} do
-      contact = seed_fully_hydrated()
-
-      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
-      _ = render_async(lv, 2_000)
-
-      # Simulate the TerrainProfileWorker broadcast — the listener
-      # recomputes elevation_profile and propagation_analysis and
-      # re-renders without crashing.
-      send(lv.pid, {:terrain_ready, contact.id})
-      html = render(lv)
-      assert html =~ contact.station1
-    end
-
-    test "handle_info ignores terrain_ready for unrelated contact", %{conn: conn} do
-      contact = seed_fully_hydrated()
-
-      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
-      _ = render_async(lv, 2_000)
-
-      send(lv.pid, {:terrain_ready, Ecto.UUID.generate()})
-      assert Process.alive?(lv.pid)
-    end
-
-    test "handle_info :sounding_fetched rehydrates the soundings table", %{conn: conn} do
-      contact = seed_fully_hydrated()
-
-      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
-      _ = render_async(lv, 2_000)
-
-      send(lv.pid, {:sounding_fetched, %{contact_id: contact.id}})
-      html = render(lv)
-      assert html =~ "Soundings"
-    end
-
-    test "handle_info :sounding_fetched for a different contact is a no-op", %{conn: conn} do
-      contact = seed_fully_hydrated()
-
-      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
-      _ = render_async(lv, 2_000)
-
-      send(lv.pid, {:sounding_fetched, %{contact_id: Ecto.UUID.generate()}})
-      assert Process.alive?(lv.pid)
-    end
-
-    test "flagged_invalid contact shows the Flagged invalid badge", %{conn: conn} do
-      contact = create_contact()
-
-      {:ok, contact} =
-        contact
-        |> Ecto.Changeset.change(flagged_invalid: true)
-        |> Repo.update()
-
-      {:ok, _lv, html} = live(conn, ~p"/contacts/#{contact.id}")
-      assert html =~ "Flagged invalid"
-      # Header station text gets line-through styling when flagged.
-      assert html =~ "line-through"
-    end
-
-    test "owner sees an Edit button (not Suggest Edit) for their own contact", %{conn: conn} do
-      import Microwaveprop.AccountsFixtures
-
-      owner = user_fixture()
-
-      {:ok, contact} =
-        %Contact{}
-        |> Contact.changeset(%{
-          station1: owner.callsign,
-          station2: "K5TR",
-          qso_timestamp: ~U[2026-03-28 18:00:00Z],
-          mode: "CW",
-          band: Decimal.new("1296"),
-          grid1: "EM12",
-          grid2: "EM00",
-          pos1: %{"lat" => 32.9, "lon" => -97.0},
-          pos2: %{"lat" => 30.3, "lon" => -97.7},
-          distance_km: Decimal.new("295"),
-          user_submitted: true,
-          submitter_email: owner.email
-        })
-        |> Ecto.Changeset.change(user_id: owner.id)
-        |> Repo.insert()
-
-      conn = log_in_user(conn, owner)
-      {:ok, _lv, html} = live(conn, ~p"/contacts/#{contact.id}")
-
-      # Owner gets the direct Edit label, not Suggest Edit.
-      assert html =~ ">\n                Edit\n              </button>" or html =~ "Edit"
-      refute html =~ "Suggest Edit"
-    end
-  end
-
-  describe "Show render-branch coverage" do
-    # Coverage-focused tests for ContactLive.Show — each test drives the
-    # LiveView far enough to render a template branch that the other
-    # describe blocks don't reach. Together they push show.ex line
-    # coverage well past 48% by forcing build_propagation_analysis,
-    # build_data_sources, terrain_summary, the iemre render block, and
-    # the can_enqueue=true enrichment kick-offs through every reachable
-    # factor/verdict combination.
-
-    use ExUnitProperties
-
-    alias Microwaveprop.Propagation.ScoreCache
-    alias Microwaveprop.Radio.ContactCommonVolumeRadar
-    alias Microwaveprop.Radio.ContactEdit
-    alias Microwaveprop.Terrain.TerrainProfile
-    alias Microwaveprop.Weather
-    alias Microwaveprop.Weather.HrrrProfile
-    alias Microwaveprop.Weather.IemreObservation
-    alias Microwaveprop.Weather.Sounding
-    alias Microwaveprop.Weather.SurfaceObservation
-
-    # Re-seed a richer variant of seed_fully_hydrated/0 so each branch test
-    # can override the single row it cares about (terrain verdict, iemre
-    # hour, propagation tier). Keeps a single insertion per source so the
-    # page renders through build_propagation_analysis exactly once.
-    defp seed_contact_with_overrides(opts \\ []) do
-      contact_overrides = Keyword.get(opts, :contact, %{})
-      terrain_overrides = Keyword.get(opts, :terrain, %{})
-      hrrr_overrides = Keyword.get(opts, :hrrr, %{})
-
-      contact =
-        create_contact(
-          Map.merge(
-            %{
-              pos1: %{"lat" => 32.9, "lon" => -97.0},
-              pos2: %{"lat" => 30.3, "lon" => -97.7}
-            },
-            contact_overrides
-          )
-        )
-
-      hrrr_row =
-        Map.merge(
-          %{
-            valid_time: contact.qso_timestamp,
-            lat: 32.9,
-            lon: -97.0,
-            profile: [
-              %{"pres" => 1000.0, "tmpc" => 20.0, "dwpc" => 12.0, "hght" => 100.0},
-              %{"pres" => 850.0, "tmpc" => 10.0, "dwpc" => 5.0, "hght" => 1500.0}
-            ],
-            hpbl_m: 1200.0,
-            pwat_mm: 25.0,
-            surface_temp_c: 20.0,
-            surface_dewpoint_c: 12.0,
-            surface_pressure_mb: 1012.0,
-            surface_refractivity: 320.0,
-            min_refractivity_gradient: -120.0,
-            ducting_detected: false
-          },
-          hrrr_overrides
-        )
-
-      Repo.insert!(struct!(HrrrProfile, hrrr_row))
-
-      terrain_row =
-        Map.merge(
-          %{
-            contact_id: contact.id,
-            sample_count: 100,
-            path_points: [%{"lat" => 32.9, "lon" => -97.0, "dist_km" => 0.0, "elev" => 200.0}],
-            max_elevation_m: 450.0,
-            min_clearance_m: 20.0,
-            diffraction_db: 6.5,
-            fresnel_hit_count: 0,
-            obstructed_count: 0,
-            verdict: "CLEAR"
-          },
-          terrain_overrides
-        )
-
-      Repo.insert!(struct!(TerrainProfile, terrain_row))
-
-      contact
-    end
-
-    setup do
-      ScoreCache.clear()
-      :ok
-    end
-
-    test "IEMRE section renders nearest-hour temperature and dew point", %{conn: conn} do
-      contact = create_contact()
-
-      # IEMRE lookup snaps pos1 (32.9, -97.0) to the nearest 1/8° grid:
-      # (32.875, -97.0). Seed exactly that grid point.
-      Repo.insert!(%IemreObservation{
-        date: DateTime.to_date(contact.qso_timestamp),
-        lat: 32.875,
-        lon: -97.0,
-        hourly: [
-          %{
-            "utc_hour" => 18,
-            "air_temp_f" => 73.4,
-            "dew_point_f" => 54.3,
-            "skyc_%" => 42.0,
-            "uwnd_mps" => 3.0,
-            "vwnd_mps" => 4.0,
-            "hourly_precip_in" => 0.0
-          }
-        ]
-      })
-
-      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
-      html = render_async(lv, 2_000)
-
-      # Header label + the nearest-hour temperature value make it
-      # through format_number. 73.4°F confirms the right hour bucket
-      # came out of the Enum.min_by reduction.
-      assert html =~ "IEMRE Gridded Reanalysis"
-      assert html =~ "73.4"
-      assert html =~ "54.3"
-    end
-
-    test "IEMRE section shows 'unavailable' status when marked as such", %{conn: conn} do
-      contact =
-        create_contact()
-        |> Ecto.Changeset.change(iemre_status: :unavailable)
-        |> Repo.update!()
-
-      {:ok, _lv, html} = live(conn, ~p"/contacts/#{contact.id}")
-      assert html =~ "IEMRE data unavailable for this contact."
-    end
-
-    test "BLOCKED terrain verdict shows the obstruction badge class", %{conn: conn} do
-      contact =
-        seed_contact_with_overrides(
-          terrain: %{
-            verdict: "BLOCKED",
-            obstructed_count: 4,
-            fresnel_hit_count: 2,
-            diffraction_db: 18.2
-          }
-        )
-
-      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
-      html = render_async(lv, 2_000)
-
-      # badge-error is the BLOCKED class; the diffraction_db value
-      # surfaces through format_number in the verdict row.
-      assert html =~ "BLOCKED"
-      assert html =~ "badge-error"
-      assert html =~ "obstructed"
-    end
-
-    test "FRESNEL_MINOR terrain verdict renders with warning styling", %{conn: conn} do
-      contact = seed_contact_with_overrides(terrain: %{verdict: "FRESNEL_MINOR"})
-
-      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
-      html = render_async(lv, 2_000)
-
-      assert html =~ "FRESNEL_MINOR"
-      assert html =~ "badge-warning"
-    end
-
-    test "FRESNEL_PARTIAL terrain verdict renders with warning styling", %{conn: conn} do
-      contact = seed_contact_with_overrides(terrain: %{verdict: "FRESNEL_PARTIAL"})
-
-      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
-      html = render_async(lv, 2_000)
-
-      assert html =~ "FRESNEL_PARTIAL"
-      assert html =~ "badge-warning"
-    end
-
-    test "expanded terrain table renders all path points", %{conn: conn} do
-      contact =
-        seed_contact_with_overrides(
-          terrain: %{
-            verdict: "CLEAR",
-            path_points: [
-              %{"lat" => 32.9, "lon" => -97.0, "dist_km" => 0.0, "elev" => 200.0},
-              %{"lat" => 31.6, "lon" => -97.35, "dist_km" => 147.5, "elev" => 320.0},
-              %{"lat" => 30.3, "lon" => -97.7, "dist_km" => 295.0, "elev" => 250.0}
-            ]
-          }
-        )
-
-      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
-      _ = render_async(lv, 2_000)
-
-      # Expand the terrain section by firing toggle_terrain; the table
-      # header "Dist (km)" only appears when @terrain_expanded is true.
-      html = render_click(lv, "toggle_terrain", %{})
-      assert html =~ "Dist (km)"
-    end
-
-    test "Propagation Analysis renders factor rows and composite tier label", %{conn: conn} do
-      contact = seed_contact_with_overrides()
-
-      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
-      html = render_async(lv, 2_000)
-
-      assert html =~ "Propagation Analysis"
-      # Factor table header — only rendered when factors != nil.
-      assert html =~ "Contribution"
-      # Humidity is always in the factor_rows list; its row label proves
-      # build_propagation_analysis -> compute_factors -> humidity_note
-      # all executed.
-      assert html =~ "Humidity"
-      # composite_score is rendered as N/100; at minimum the "/100" marker
-      # plus one of the tier labels must appear.
-      assert html =~ "/100"
-
-      assert html =~ "EXCELLENT" or html =~ "GOOD" or html =~ "MARGINAL" or
-               html =~ "POOR" or html =~ "NEGLIGIBLE"
-    end
-
-    test "Data Sources card renders HRRR, Terrain, and Elevation blocks", %{conn: conn} do
-      contact = seed_contact_with_overrides()
-
-      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
-      html = render_async(lv, 2_000)
-
-      assert html =~ "Data Sources"
-      assert html =~ "HRRR Model"
-      assert html =~ "Terrain Analysis"
-      assert html =~ "Elevation Profile"
-    end
-
-    test "internal-network conn kicks off enqueue path and transitions pending status", %{conn: conn} do
-      # A contact with only coords + pending everything triggers every
-      # maybe_enqueue_* branch once can_enqueue is true. We never run
-      # Oban inline during the test; we just assert the hydration
-      # finishes without crashing the LiveView.
-      contact = create_contact()
-
-      # `store_remote_ip` pulls conn.remote_ip into the session. Seeding
-      # it into the @enqueue_subnet CIDR makes internal_network?/1 true.
-      conn = %{conn | remote_ip: {172, 56, 0, 1}}
-
-      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
-      _ = render_async(lv, 2_000)
-
-      assert Process.alive?(lv.pid)
-      # The page still renders both station callsigns; no enrichment
-      # row exists, so the fallback spinners / "No *" copy is fine.
-      assert render(lv) =~ contact.station1
-    end
-
-    test "radar row surfaces max_dbz and coverage_pct in the mechanism block", %{conn: conn} do
-      contact = create_contact()
-
-      Repo.insert!(%ContactCommonVolumeRadar{
-        contact_id: contact.id,
-        observed_at: contact.qso_timestamp,
-        common_volume_km2: 12_500.0,
-        pixel_count: 800,
-        rain_pixel_count: 150,
-        heavy_rain_pixel_count: 25,
-        max_dbz: 47.5,
-        mean_dbz: 22.3,
-        coverage_pct: 18.0
-      })
-
-      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
-      html = render_async(lv, 2_000)
-
-      assert html =~ "Propagation Mechanism"
-      # Max reflectivity + heavy-rain pixel count only render when
-      # @radar is populated — i.e. after handle_async(:radar, …) lands.
-      assert html =~ "47.5 dBZ"
-      assert html =~ "Heavy-rain pixels: 25"
-    end
-
-    test "non-owner with a pending edit sees the pending-edit banner", %{conn: conn} do
-      import Microwaveprop.AccountsFixtures
-
-      contact = create_contact()
-      stranger = user_fixture()
-
-      Repo.insert!(%ContactEdit{
-        contact_id: contact.id,
-        user_id: stranger.id,
-        proposed_changes: %{"station2" => "K9EDIT"},
-        status: :pending
-      })
-
-      conn = log_in_user(conn, stranger)
-      {:ok, _lv, html} = live(conn, ~p"/contacts/#{contact.id}")
-
-      assert html =~ "pending edit for this contact awaiting admin review"
-    end
-
-    test "full Atmospheric Profile block renders surface temp/dewpoint/pressure", %{conn: conn} do
-      contact = seed_contact_with_overrides()
-
-      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
-      html = render_async(lv, 2_000)
-
-      # All three surface scalars are only rendered once the atmospheric
-      # profile card expands — hrrr_profile_expanded defaults to true.
-      assert html =~ "Surface Temp:"
-      assert html =~ "Surface Dewpoint:"
-      assert html =~ "Surface Pressure:"
-    end
-
-    test "soundings-empty state shows the 1000 km fallback copy", %{conn: conn} do
-      contact = create_contact()
-      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
-      html = render_async(lv, 2_000)
-
-      # No soundings within radius + nothing queued => final <% true -> %>
-      # branch of the soundings empty cond.
-      assert html =~ "No soundings found within 1000 km."
-    end
-
-    test "surface-observations queued status shows spinner copy", %{conn: conn} do
-      contact =
-        create_contact()
-        |> Ecto.Changeset.change(weather_status: :queued)
-        |> Repo.update!()
-
-      {:ok, _lv, html} = live(conn, ~p"/contacts/#{contact.id}")
-
-      # Initial render (before render_async) sees @surface_observations=[]
-      # and @contact.weather_status == :queued — the surface observations
-      # spinner copy is reachable there.
-      assert html =~ "Fetching surface observations" or html =~ "Surface Observations"
-    end
-
-    test "ducting detected on the HRRR profile shows the Ducting badge", %{conn: conn} do
-      contact =
-        seed_contact_with_overrides(
-          hrrr: %{
-            ducting_detected: true,
-            min_refractivity_gradient: -200.0
-          }
-        )
-
-      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
-      html = render_async(lv, 2_000)
-
-      # Ducting badge appears next to the HRRR metadata line when the
-      # profile reports ducting_detected=true.
-      assert html =~ "Ducting"
-    end
-
-    test "sounding row with a real station shows the ducting detection badge", %{conn: conn} do
-      contact = create_contact()
-
-      {:ok, station} =
-        Weather.find_or_create_station(%{
-          station_code: "KFWD",
-          station_type: "sounding",
-          name: "Fort Worth",
-          lat: 32.83,
-          lon: -97.30
-        })
-
-      Repo.insert!(
-        Sounding.changeset(%Sounding{}, %{
-          station_id: station.id,
-          observed_at: ~U[2026-03-28 12:00:00Z],
-          profile: [
-            %{"pres" => 1000.0, "tmpc" => 20.0, "dwpc" => 15.0, "hght" => 100.0},
-            %{"pres" => 850.0, "tmpc" => 12.0, "dwpc" => 8.0, "hght" => 1500.0}
-          ],
-          level_count: 2,
-          surface_temp_c: 20.0,
-          surface_dewpoint_c: 15.0,
-          surface_refractivity: 340.0,
-          ducting_detected: true
-        })
-      )
-
-      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
-      html = render_async(lv, 2_000)
-
-      # Ducting badge renders inside the sounding button only for
-      # rows with ducting_detected=true.
-      assert html =~ "KFWD"
-      assert html =~ "Ducting"
-    end
-
-    # ─── Property tests ──────────────────────────────────────────
-
-    property "obs-table sort handler is total over every known field and direction", %{conn: conn} do
-      # Drive the sort handler with every documented obs field in
-      # arbitrary order. The LV must keep the table rendered and not
-      # drop / duplicate any seeded row. Field coverage here exercises
-      # each clause of obs_sort_key/1 plus the fall-through default.
-      contact = create_contact(%{station1: "W5PROP", qso_timestamp: ~U[2026-03-28 18:00:00Z]})
-
-      {:ok, station} =
-        Weather.find_or_create_station(%{
-          station_code: "KDFW",
-          station_type: "asos",
-          name: "DFW Airport",
-          lat: 32.9,
-          lon: -97.02
-        })
-
-      Repo.insert!(
-        SurfaceObservation.changeset(%SurfaceObservation{}, %{
-          station_id: station.id,
-          observed_at: contact.qso_timestamp,
-          temp_f: 70.0,
-          dewpoint_f: 55.0,
-          relative_humidity: 55.0,
-          sea_level_pressure_mb: 1015.0
-        })
-      )
-
-      known_fields =
-        ~w(station_name observed_at temp_f dewpoint_f relative_humidity sea_level_pressure_mb zzz_unknown)
-
-      field_stream = StreamData.member_of(known_fields)
-      sequence_gen = StreamData.list_of(field_stream, min_length: 1, max_length: 6)
-
-      check all(fields <- sequence_gen, max_runs: 15) do
-        # One LV per run keeps each iteration's sort history isolated —
-        # the sort handler flips between asc/desc based on prior state.
-        {:ok, lv, _} = live(conn, ~p"/contacts/#{contact.id}")
-        _ = render_async(lv, 2_000)
-
-        for f <- fields do
-          html = render_click(lv, "sort", %{"field" => f, "table" => "obs"})
-          assert html =~ "Surface Observations", "sort by #{f} lost the obs table"
-        end
-
-        assert Process.alive?(lv.pid)
-      end
-    end
-
-    property "soundings-table sort handler tolerates arbitrary field keys", %{conn: conn} do
-      # Mirrors the obs property — any sequence of known + unknown
-      # sounding sort fields should leave the LV alive with the
-      # Soundings heading intact.
-      contact = create_contact(%{qso_timestamp: ~U[2026-03-28 18:00:00Z]})
-
-      fields_pool =
-        ~w(station_name observed_at surface_temp_c surface_refractivity k_index lifted_index unknown)
-
-      sequence_gen =
-        StreamData.list_of(StreamData.member_of(fields_pool), min_length: 1, max_length: 4)
-
-      check all(fields <- sequence_gen, max_runs: 10) do
-        {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
-        _ = render_async(lv, 2_000)
-
-        for f <- fields do
-          html = render_click(lv, "sort", %{"field" => f, "table" => "soundings"})
-          assert html =~ "Soundings", "sort by #{f} lost the soundings section"
-        end
-
-        assert Process.alive?(lv.pid)
-      end
-    end
-  end
-
-  describe "Show additional branch coverage" do
-    # Extra tests aimed at previously-uncovered helpers in
-    # ContactLive.Show: factor note helpers (exercised via the factor
-    # table), propagation_mechanism branches, admin/owner/stranger
-    # edit paths with error changesets, internal_network? edge cases,
-    # elevation profile hydration with a populated SRTM stub, and
-    # handle_info({:sounding_fetched, …}) with a non-matching id.
-
-    use ExUnitProperties
-
-    import Microwaveprop.AccountsFixtures
-
-    alias Microwaveprop.Propagation.BandConfig
-    alias Microwaveprop.Propagation.ScoreCache
-    alias Microwaveprop.Propagation.Scorer
-    alias Microwaveprop.Radio.ContactCommonVolumeRadar
-    alias Microwaveprop.Radio.ContactEdit
-    alias Microwaveprop.Terrain.TerrainProfile
-    alias Microwaveprop.Weather.HrrrProfile
-
-    defp admin_fixture! do
-      user = user_fixture()
-      {:ok, user} = Microwaveprop.Accounts.admin_update_user(user, %{is_admin: true})
-      user
-    end
-
-    setup do
-      ScoreCache.clear()
-      :ok
-    end
-
-    test "factor notes render every note-branch for a 10 GHz contact", %{conn: conn} do
-      # Drives humidity_note (beneficial branch), time_note (solar_period
-      # evening → hour 18 UTC with lon -97), td_note (moderate, 72-55=17),
-      # refractivity_note (ducting/super-refractive branch), sky_note,
-      # season_note (March = summer peak band inverted), wind_note,
-      # rain_note (None), pwat_note, pressure_note (high branch).
-      contact =
-        create_contact(%{
-          band: Decimal.new("10000"),
-          pos1: %{"lat" => 32.9, "lon" => -97.0},
-          pos2: %{"lat" => 30.3, "lon" => -97.7},
-          qso_timestamp: ~U[2026-03-28 18:00:00Z]
-        })
-
-      Repo.insert!(%HrrrProfile{
-        valid_time: contact.qso_timestamp,
-        lat: 32.9,
-        lon: -97.0,
-        profile: [
-          %{"pres" => 1000.0, "tmpc" => 22.0, "dwpc" => 12.0, "hght" => 100.0}
-        ],
-        hpbl_m: 1200.0,
-        pwat_mm: 32.0,
-        surface_temp_c: 22.0,
-        surface_dewpoint_c: 12.0,
-        surface_pressure_mb: 1020.0,
-        surface_refractivity: 340.0,
-        min_refractivity_gradient: -160.0,
-        ducting_detected: true
-      })
-
-      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
-      html = render_async(lv, 2_000)
-
-      assert html =~ "beneficial at this band"
-      assert html =~ "ducting"
-      # High pressure label from pressure_note (1020 >= 1015)
-      assert html =~ "(high)"
-      # 10G = :beneficial humidity_effect -> "summer peak band"
-      assert html =~ "summer peak band"
-      # pwat_note at 10G band picks the "refractivity aid" branch
-      assert html =~ "refractivity aid"
-      # rain_note returns "None" when rate is 0
-      assert html =~ "None"
-    end
-
-    test "factor notes render 'absorption' and 'winter peak' branches at 24 GHz", %{conn: conn} do
-      # At 24 GHz the band_config flips humidity_effect to :harmful, so
-      # pwat_note hits the "absorption" branch and season_note prints
-      # "winter peak".
-      contact =
-        create_contact(%{
-          band: Decimal.new("24000"),
-          pos1: %{"lat" => 32.9, "lon" => -97.0},
-          pos2: %{"lat" => 30.3, "lon" => -97.7},
-          qso_timestamp: ~U[2026-01-15 18:00:00Z]
-        })
-
-      Repo.insert!(%HrrrProfile{
-        valid_time: contact.qso_timestamp,
-        lat: 32.9,
-        lon: -97.0,
-        profile: [
-          %{"pres" => 1000.0, "tmpc" => 5.0, "dwpc" => -2.0, "hght" => 100.0}
-        ],
-        hpbl_m: 1200.0,
-        pwat_mm: 28.0,
-        surface_temp_c: 5.0,
-        surface_dewpoint_c: -2.0,
-        surface_pressure_mb: 1000.0,
-        surface_refractivity: 310.0,
-        min_refractivity_gradient: -50.0,
-        ducting_detected: false
-      })
-
-      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
-      html = render_async(lv, 2_000)
-
-      assert html =~ "harmful at this band"
-      assert html =~ "absorption"
-      assert html =~ "winter peak band"
-      # pressure_note "low" branch (1000 < 1005)
-      assert html =~ "(low)"
-    end
-
-    test "td_note renders 'near saturation' when dewpoint hugs temperature", %{conn: conn} do
-      contact =
-        create_contact(%{
-          band: Decimal.new("10000"),
-          pos1: %{"lat" => 32.9, "lon" => -97.0},
-          pos2: %{"lat" => 30.3, "lon" => -97.7}
-        })
-
-      Repo.insert!(%HrrrProfile{
-        valid_time: contact.qso_timestamp,
-        lat: 32.9,
-        lon: -97.0,
-        profile: [%{"pres" => 1000.0, "tmpc" => 20.0, "dwpc" => 19.5, "hght" => 100.0}],
-        hpbl_m: 800.0,
-        pwat_mm: 25.0,
-        surface_temp_c: 20.0,
-        surface_dewpoint_c: 19.5,
-        surface_pressure_mb: 1010.0,
-        surface_refractivity: 340.0,
-        min_refractivity_gradient: -90.0,
-        ducting_detected: false
-      })
-
-      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
-      html = render_async(lv, 2_000)
-
-      # near saturation branch of td_note when T-Td < 3
-      assert html =~ "near saturation"
-      # refractivity_note "enhanced" branch (-90 is between -100 and -79)
-      assert html =~ "enhanced"
-      # pressure_note "moderate" branch (1010 in [1005, 1015))
-      assert html =~ "(moderate)"
-    end
-
-    test "td_note renders 'dry' branch for a large T-Td depression", %{conn: conn} do
-      contact =
-        create_contact(%{
-          band: Decimal.new("10000"),
-          pos1: %{"lat" => 32.9, "lon" => -97.0},
-          pos2: %{"lat" => 30.3, "lon" => -97.7}
-        })
-
-      Repo.insert!(%HrrrProfile{
-        valid_time: contact.qso_timestamp,
-        lat: 32.9,
-        lon: -97.0,
-        profile: [%{"pres" => 1000.0, "tmpc" => 30.0, "dwpc" => 0.0, "hght" => 100.0}],
-        hpbl_m: 2200.0,
-        pwat_mm: 8.0,
-        surface_temp_c: 30.0,
-        surface_dewpoint_c: 0.0,
-        surface_pressure_mb: 1012.0,
-        surface_refractivity: 280.0,
-        min_refractivity_gradient: -40.0,
-        ducting_detected: false
-      })
-
-      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
-      html = render_async(lv, 2_000)
-
-      # T-Td = ~54°F (30C vs 0C = 86F vs 32F) -> "dry" branch
-      assert html =~ "(dry)"
-      # refractivity_note "normal" branch (grad -40 > -79)
-      assert html =~ "(normal)"
-    end
-
-    test "BLOCKED terrain with ducting selects the 'atmospheric ducting' mechanism copy", %{conn: conn} do
-      contact =
-        create_contact(%{
-          band: Decimal.new("10000"),
-          pos1: %{"lat" => 32.9, "lon" => -97.0},
-          pos2: %{"lat" => 30.3, "lon" => -97.7}
-        })
-
-      Repo.insert!(%HrrrProfile{
-        valid_time: contact.qso_timestamp,
-        lat: 32.9,
-        lon: -97.0,
-        profile: [%{"pres" => 1000.0, "tmpc" => 20.0, "dwpc" => 15.0, "hght" => 100.0}],
-        hpbl_m: 800.0,
-        pwat_mm: 30.0,
-        surface_temp_c: 20.0,
-        surface_dewpoint_c: 15.0,
-        surface_pressure_mb: 1015.0,
-        surface_refractivity: 340.0,
-        min_refractivity_gradient: -180.0,
-        ducting_detected: true
-      })
-
-      Repo.insert!(%TerrainProfile{
-        contact_id: contact.id,
-        sample_count: 100,
-        path_points: [%{"lat" => 32.9, "lon" => -97.0, "dist_km" => 0.0, "elev" => 200.0}],
-        max_elevation_m: 800.0,
-        min_clearance_m: -50.0,
-        diffraction_db: 22.0,
-        fresnel_hit_count: 5,
-        obstructed_count: 4,
-        verdict: "BLOCKED"
-      })
-
-      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
-      html = render_async(lv, 2_000)
-
-      # blocked_mechanism with ducting? true, likely_duct nil (no elevation profile
-      # hydrated here because the Req.Test stub returns []), so we get the
-      # "bypassing the terrain obstruction" copy.
-      assert html =~ "tropospheric duct" or html =~ "atmospheric ducting"
-    end
-
-    test "BLOCKED terrain with enhanced refraction but no ducting uses the 'dN/dh' copy", %{conn: conn} do
-      contact =
-        create_contact(%{
-          band: Decimal.new("10000"),
-          pos1: %{"lat" => 32.9, "lon" => -97.0},
-          pos2: %{"lat" => 30.3, "lon" => -97.7}
-        })
-
-      Repo.insert!(%HrrrProfile{
-        valid_time: contact.qso_timestamp,
-        lat: 32.9,
-        lon: -97.0,
-        profile: [%{"pres" => 1000.0, "tmpc" => 20.0, "dwpc" => 10.0, "hght" => 100.0}],
-        hpbl_m: 1200.0,
-        pwat_mm: 20.0,
-        surface_temp_c: 20.0,
-        surface_dewpoint_c: 10.0,
-        surface_pressure_mb: 1015.0,
-        surface_refractivity: 320.0,
-        min_refractivity_gradient: -140.0,
-        ducting_detected: false
-      })
-
-      Repo.insert!(%TerrainProfile{
-        contact_id: contact.id,
-        sample_count: 100,
-        path_points: [%{"lat" => 32.9, "lon" => -97.0, "dist_km" => 0.0, "elev" => 200.0}],
-        max_elevation_m: 800.0,
-        min_clearance_m: -20.0,
-        diffraction_db: 18.0,
-        fresnel_hit_count: 3,
-        obstructed_count: 2,
-        verdict: "BLOCKED"
-      })
-
-      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
-      html = render_async(lv, 2_000)
-
-      # Enhanced-refraction blocked_mechanism branch — prints "dN/dh = …"
-      assert html =~ "dN/dh ="
-      assert html =~ "Enhanced refraction"
-    end
-
-    test "BLOCKED terrain with no ducting or refraction falls back to diffraction copy", %{conn: conn} do
-      contact =
-        create_contact(%{
-          band: Decimal.new("10000"),
-          pos1: %{"lat" => 32.9, "lon" => -97.0},
-          pos2: %{"lat" => 30.3, "lon" => -97.7}
-        })
-
-      Repo.insert!(%HrrrProfile{
-        valid_time: contact.qso_timestamp,
-        lat: 32.9,
-        lon: -97.0,
-        profile: [%{"pres" => 1000.0, "tmpc" => 20.0, "dwpc" => 10.0, "hght" => 100.0}],
-        hpbl_m: 1200.0,
-        pwat_mm: 20.0,
-        surface_temp_c: 20.0,
-        surface_dewpoint_c: 10.0,
-        surface_pressure_mb: 1015.0,
-        surface_refractivity: 320.0,
-        min_refractivity_gradient: -30.0,
-        ducting_detected: false
-      })
-
-      Repo.insert!(%TerrainProfile{
-        contact_id: contact.id,
-        sample_count: 100,
-        path_points: [%{"lat" => 32.9, "lon" => -97.0, "dist_km" => 0.0, "elev" => 200.0}],
-        max_elevation_m: 800.0,
-        min_clearance_m: -20.0,
-        diffraction_db: 14.5,
-        fresnel_hit_count: 3,
-        obstructed_count: 2,
-        verdict: "BLOCKED"
-      })
-
-      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
-      html = render_async(lv, 2_000)
-
-      assert html =~ "diffraction loss"
-      assert html =~ "knife-edge diffraction"
-    end
-
-    test "clear path with long distance + ducting renders 'extending range' copy", %{conn: conn} do
-      # distance_km > 100 AND ducting_detected → clear_path_mechanism
-      # ducting branch (no likely_duct since no elevation profile).
-      contact =
-        create_contact(%{
-          band: Decimal.new("10000"),
-          pos1: %{"lat" => 32.9, "lon" => -97.0},
-          pos2: %{"lat" => 30.3, "lon" => -97.7},
-          distance_km: Decimal.new("295")
-        })
-
-      Repo.insert!(%HrrrProfile{
-        valid_time: contact.qso_timestamp,
-        lat: 32.9,
-        lon: -97.0,
-        profile: [%{"pres" => 1000.0, "tmpc" => 22.0, "dwpc" => 20.0, "hght" => 100.0}],
-        hpbl_m: 700.0,
-        pwat_mm: 30.0,
-        surface_temp_c: 22.0,
-        surface_dewpoint_c: 20.0,
-        surface_pressure_mb: 1012.0,
-        surface_refractivity: 350.0,
-        min_refractivity_gradient: -200.0,
-        ducting_detected: true
-      })
-
-      Repo.insert!(%TerrainProfile{
-        contact_id: contact.id,
-        sample_count: 100,
-        path_points: [%{"lat" => 32.9, "lon" => -97.0, "dist_km" => 0.0, "elev" => 200.0}],
-        max_elevation_m: 400.0,
-        min_clearance_m: 50.0,
-        diffraction_db: 0.0,
-        fresnel_hit_count: 0,
-        obstructed_count: 0,
-        verdict: "CLEAR"
-      })
-
-      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
-      html = render_async(lv, 2_000)
-
-      assert html =~ "Ducting conditions present"
-      assert html =~ "extended range" or html =~ "extending range"
-    end
-
-    test "clear path with enhanced refraction but no ducting hits the long-path branch", %{conn: conn} do
-      contact =
-        create_contact(%{
-          band: Decimal.new("10000"),
-          pos1: %{"lat" => 32.9, "lon" => -97.0},
-          pos2: %{"lat" => 30.3, "lon" => -97.7},
-          distance_km: Decimal.new("200")
-        })
-
-      Repo.insert!(%HrrrProfile{
-        valid_time: contact.qso_timestamp,
-        lat: 32.9,
-        lon: -97.0,
-        profile: [%{"pres" => 1000.0, "tmpc" => 20.0, "dwpc" => 10.0, "hght" => 100.0}],
-        hpbl_m: 1200.0,
-        pwat_mm: 20.0,
-        surface_temp_c: 20.0,
-        surface_dewpoint_c: 10.0,
-        surface_pressure_mb: 1012.0,
-        surface_refractivity: 320.0,
-        min_refractivity_gradient: -140.0,
-        ducting_detected: false
-      })
-
-      Repo.insert!(%TerrainProfile{
-        contact_id: contact.id,
-        sample_count: 100,
-        path_points: [%{"lat" => 32.9, "lon" => -97.0, "dist_km" => 0.0, "elev" => 200.0}],
-        max_elevation_m: 400.0,
-        min_clearance_m: 50.0,
-        diffraction_db: 0.0,
-        fresnel_hit_count: 0,
-        obstructed_count: 0,
-        verdict: "CLEAR"
-      })
-
-      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
-      html = render_async(lv, 2_000)
-
-      # clear_path_mechanism(enhanced_refraction?: true, long_path?: true)
-      assert html =~ "Enhanced refraction present"
-    end
-
-    test "admin edit of private toggle and height triggers the diff branch", %{conn: conn} do
-      # apply_admin_edit → Radio.diff_against_contact → Radio.normalize_proposed
-      # covering the normalize_boolean_field("true") + normalize_integer_field.
-      contact = create_contact()
-      admin = admin_fixture!()
-      conn = log_in_user(conn, admin)
-
-      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
-      render_click(lv, "toggle_edit", %{})
-
-      html =
-        render_submit(lv, "submit_edit", %{
-          "edit" => %{
-            "station1" => contact.station1,
-            "station2" => contact.station2,
-            "grid1" => contact.grid1,
-            "grid2" => contact.grid2,
-            "mode" => contact.mode,
-            "height1_ft" => "35",
-            "private" => "true"
-          }
-        })
-
-      assert html =~ "Contact updated"
-
-      refreshed = Repo.get!(Contact, contact.id)
-      assert refreshed.height1_ft == 35
-      assert refreshed.private == true
-    end
-
-    test "admin edit with no changes flashes 'No changes detected'", %{conn: conn} do
-      contact = create_contact()
-      admin = admin_fixture!()
-      conn = log_in_user(conn, admin)
-
-      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
-      render_click(lv, "toggle_edit", %{})
-
-      html =
-        render_submit(lv, "submit_edit", %{
-          "edit" => %{
-            "station1" => contact.station1,
-            "station2" => contact.station2,
-            "grid1" => contact.grid1,
-            "grid2" => contact.grid2,
-            "mode" => contact.mode
-          }
-        })
-
-      assert html =~ "No changes detected"
-    end
-
-    test "owner submit with identical values returns no-changes flash", %{conn: conn} do
-      # apply_owner_edit → diffed == %{} → {:error, :no_changes}
-      owner = user_fixture()
-
-      {:ok, contact} =
-        %Contact{}
-        |> Contact.changeset(%{
-          station1: owner.callsign,
-          station2: "K5TR",
-          qso_timestamp: ~U[2026-03-28 18:00:00Z],
-          mode: "CW",
-          band: Decimal.new("1296"),
-          grid1: "EM12",
-          grid2: "EM00",
-          pos1: %{"lat" => 32.9, "lon" => -97.0},
-          pos2: %{"lat" => 30.3, "lon" => -97.7},
-          distance_km: Decimal.new("295"),
-          user_submitted: true,
-          submitter_email: owner.email
-        })
-        |> Ecto.Changeset.change(user_id: owner.id)
-        |> Repo.insert()
-
-      conn = log_in_user(conn, owner)
-      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
-      render_click(lv, "toggle_edit", %{})
-
-      html =
-        render_submit(lv, "submit_edit", %{
-          "edit" => %{
-            "station1" => contact.station1,
-            "station2" => contact.station2,
-            "grid1" => contact.grid1,
-            "grid2" => contact.grid2,
-            "mode" => contact.mode
-          }
-        })
-
-      assert html =~ "No changes detected"
-    end
-
-    test "stranger submit with an invalid mode surfaces the changeset error flash", %{conn: conn} do
-      # submit_user_edit → Radio.create_contact_edit → {:error, changeset}
-      # because "BOGUS" is not in the allowed mode list.
-      contact = create_contact()
-      stranger = user_fixture()
-      conn = log_in_user(conn, stranger)
-
-      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
-      render_click(lv, "toggle_edit", %{})
-
-      html =
-        render_submit(lv, "submit_edit", %{
-          "edit" => %{
-            "station1" => contact.station1,
-            "station2" => contact.station2,
-            "grid1" => contact.grid1,
-            "grid2" => contact.grid2,
-            "mode" => "BOGUS"
-          }
-        })
-
-      assert html =~ "Could not submit edit"
-      # No ContactEdit row was inserted for the invalid submission.
-      assert Repo.aggregate(ContactEdit, :count, :id) == 0
-    end
-
-    test "internal_network? false when no session IP is recorded", %{conn: conn} do
-      # conn.remote_ip is {127, 0, 0, 1} by default — plug serializes
-      # that into session["remote_ip"] as "127.0.0.1", which is outside
-      # the @enqueue_subnet (172.56.0.0/13). can_enqueue must be false.
-      contact = create_contact()
-
-      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
-      _ = render_async(lv, 2_000)
-
-      refute :sys.get_state(lv.pid).socket.assigns.can_enqueue
-    end
-
-    test "internal_network? false for an IP just outside the enqueue subnet", %{conn: conn} do
-      # 8.8.8.8 is nowhere near 172.56.0.0/13 — exercises the subnet
-      # match returning false inside the parseable-IP branch.
-      conn = %{conn | remote_ip: {8, 8, 8, 8}}
-      contact = create_contact()
-
-      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
-      _ = render_async(lv, 2_000)
-
-      refute :sys.get_state(lv.pid).socket.assigns.can_enqueue
-    end
-
-    test "internal_network? true when session IP sits inside the enqueue subnet", %{conn: conn} do
-      # The store_remote_ip plug sources from conn.remote_ip, so override
-      # the tuple directly — the plug serializes it into session["remote_ip"]
-      # where internal_network?/1 picks it up.
-      conn = %{conn | remote_ip: {172, 56, 0, 10}}
-      contact = create_contact()
-
-      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
-      _ = render_async(lv, 2_000)
-
-      assert :sys.get_state(lv.pid).socket.assigns.can_enqueue
-    end
-
-    test "expanded_soundings MapSet exposes the skew-T table when a sounding is expanded",
-         %{conn: conn} do
-      alias Microwaveprop.Weather
-      alias Microwaveprop.Weather.Sounding
-
-      contact = create_contact()
-
-      {:ok, station} =
-        Weather.find_or_create_station(%{
-          station_code: "KFWD",
-          station_type: "sounding",
-          name: "Fort Worth",
-          lat: 32.83,
-          lon: -97.30
-        })
-
-      {:ok, sounding} =
-        %Sounding{}
-        |> Sounding.changeset(%{
-          station_id: station.id,
-          observed_at: ~U[2026-03-28 12:00:00Z],
-          profile: [
-            %{"pres" => 1000.0, "tmpc" => 20.0, "dwpc" => 15.0, "hght" => 100.0},
-            %{"pres" => 850.0, "tmpc" => 12.0, "dwpc" => 8.0, "hght" => 1500.0}
-          ],
-          level_count: 2,
-          surface_temp_c: 20.0,
-          surface_dewpoint_c: 15.0
-        })
-        |> Repo.insert()
-
-      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
-      _ = render_async(lv, 2_000)
-
-      # Fire toggle_profile twice: once to open, once to close. Between
-      # the two we should see the expanded table's "Wind Dir" header;
-      # after the second click the expanded container is hidden again.
-      html_open = render_click(lv, "toggle_profile", %{"id" => sounding.id})
-      assert html_open =~ "Wind Dir"
-
-      html_closed = render_click(lv, "toggle_profile", %{"id" => sounding.id})
-      refute html_closed =~ "Wind Dir"
-    end
-
-    test "load_pending_edit returns the existing edit for a logged-in user", %{conn: conn} do
-      # Hits the %{current_scope: %{user: %{id: user_id}}} branch of
-      # load_pending_edit/2, which otherwise only runs for anonymous.
-      contact = create_contact()
-      user = user_fixture()
-
-      Repo.insert!(%ContactEdit{
-        contact_id: contact.id,
-        user_id: user.id,
-        proposed_changes: %{"station2" => "K9EDIT"},
-        status: :pending
-      })
-
-      conn = log_in_user(conn, user)
-      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
-
-      assigns = :sys.get_state(lv.pid).socket.assigns
-      assert %ContactEdit{status: :pending} = assigns.pending_edit
-    end
-
-    test "fetch_queue_counts hits the Cache.fetch_or_store round trip", %{conn: conn} do
-      alias Microwaveprop.Workers.SolarIndexWorker
-
-      # Inserting a real Oban job before mount means fetch_queue_counts
-      # has real data to return, exercising the import+query branch of
-      # the private helper via Cache.fetch_or_store.
-      {:ok, _job} = Oban.insert(SolarIndexWorker.new(%{"date" => "2026-03-28"}))
-
-      contact = create_contact()
-      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
-
-      counts = :sys.get_state(lv.pid).socket.assigns.queue_counts
-      assert is_map(counts)
-    end
-
-    test "handle_info({:sounding_fetched, …}) with mismatched contact_id is a no-op",
-         %{conn: conn} do
-      contact = create_contact()
-      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
-      _ = render_async(lv, 2_000)
-
-      # The mismatched-id branch is the `else` of the id-equality check
-      # inside handle_info — it must leave the LV alive and the
-      # soundings assign untouched.
-      soundings_before = :sys.get_state(lv.pid).socket.assigns.soundings
-      send(lv.pid, {:sounding_fetched, %{contact_id: Ecto.UUID.generate()}})
-      # Give the message time to be processed.
-      _ = :sys.get_state(lv.pid)
-
-      assert Process.alive?(lv.pid)
-      assert :sys.get_state(lv.pid).socket.assigns.soundings == soundings_before
-    end
-
-    test "rain_scatter mechanism surfaces for a 24 GHz contact with heavy rain pixels",
-         %{conn: conn} do
-      # Radar row with high max_dbz + heavy_rain_pixel_count plus a high
-      # band drives the RainScatterClassifier into its rain-scatter
-      # label. The Mechanism component renders the resulting label.
-      contact =
-        create_contact(%{
-          band: Decimal.new("24000"),
-          distance_km: Decimal.new("250")
-        })
-
-      Repo.insert!(%ContactCommonVolumeRadar{
-        contact_id: contact.id,
-        observed_at: contact.qso_timestamp,
-        common_volume_km2: 15_000.0,
-        pixel_count: 1200,
-        rain_pixel_count: 400,
-        heavy_rain_pixel_count: 120,
-        max_dbz: 52.0,
-        mean_dbz: 35.0,
-        coverage_pct: 33.0
-      })
-
-      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
-      html = render_async(lv, 2_000)
-
-      # The radar summary row surfaces max_dbz + coverage_pct.
-      assert html =~ "52.0 dBZ"
-      assert html =~ "Heavy-rain pixels: 120"
-      # Propagation Mechanism headline always renders.
-      assert html =~ "Propagation Mechanism"
-    end
-
-    test "elevation profile hydrates when the SRTM stub returns a populated path",
-         %{conn: conn} do
-      # The default ElevationClient stub returns []; override it for this
-      # test to return a simple synthetic profile in open-meteo shape.
-      # That drives compute_elevation_profile → TerrainAnalysis.analyse →
-      # extract_ducts → merge_nearby_ducts → mark_likely_duct.
-      Req.Test.stub(ElevationClient, fn conn ->
-        if conn.host == "api.open-meteo.com" do
-          n = 257
-          Req.Test.json(conn, %{"elevation" => List.duplicate(300.0, n)})
-        else
-          Req.Test.json(conn, [])
-        end
-      end)
-
-      contact =
-        create_contact(%{
-          band: Decimal.new("10000"),
-          pos1: %{"lat" => 32.9, "lon" => -97.0},
-          pos2: %{"lat" => 30.3, "lon" => -97.7}
-        })
-
-      Repo.insert!(%HrrrProfile{
-        valid_time: contact.qso_timestamp,
-        lat: 32.9,
-        lon: -97.0,
-        profile: [%{"pres" => 1000.0, "tmpc" => 20.0, "dwpc" => 10.0, "hght" => 100.0}],
-        hpbl_m: 1200.0,
-        pwat_mm: 25.0,
-        surface_temp_c: 20.0,
-        surface_dewpoint_c: 10.0,
-        surface_pressure_mb: 1012.0,
-        surface_refractivity: 320.0,
-        min_refractivity_gradient: -200.0,
-        ducting_detected: false
-      })
-
-      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
-      _ = render_async(lv, 2_000)
-
-      # The elevation_profile assign is populated only when
-      # compute_elevation_profile returns a %{} — i.e. the SRTM stub
-      # succeeded and TerrainAnalysis.analyse returned a result.
-      ep = :sys.get_state(lv.pid).socket.assigns.elevation_profile
-      assert ep
-      assert is_list(ep.points)
-      # Ducts were inferred from the strong min_refractivity_gradient.
-      assert is_list(ep.ducts)
-    end
-
-    # ─── Property tests ──────────────────────────────────────────
-
-    property "Scorer.composite_score always stays within [0, 100]" do
-      # Generator drives path-integrated conditions through every band
-      # in BandConfig to guarantee the tier label / class branches in
-      # show.ex (which consume this exact composite score) never see
-      # an out-of-range input. Keeps the weight-sum contract honest.
-      all_band_mhz = BandConfig.all_freqs()
-
-      check all(
-              band_mhz <- StreamData.member_of(all_band_mhz),
-              temp_c <- StreamData.float(min: -40.0, max: 50.0),
-              td_depression <- StreamData.float(min: 0.0, max: 25.0),
-              pressure_mb <- StreamData.float(min: 950.0, max: 1050.0),
-              sky_pct <- StreamData.float(min: 0.0, max: 100.0),
-              wind_kts <- StreamData.float(min: 0.0, max: 40.0),
-              grad <- StreamData.float(min: -300.0, max: 50.0),
-              pwat_mm <- StreamData.float(min: 0.0, max: 60.0),
-              month <- StreamData.integer(1..12),
-              hour <- StreamData.integer(0..23),
-              max_runs: 30
-            ) do
-        band_config = BandConfig.get(band_mhz)
-
-        conditions = %{
-          temp_f: temp_c * 9 / 5 + 32,
-          dewpoint_f: (temp_c - td_depression) * 9 / 5 + 32,
-          temp_c: temp_c,
-          dewpoint_c: temp_c - td_depression,
-          abs_humidity: max(0.1, 10.0 - td_depression * 0.3),
-          min_refractivity_gradient: grad,
-          bl_depth_m: 1000.0,
-          pressure_mb: pressure_mb,
-          prev_pressure_mb: pressure_mb,
-          sky_cover_pct: sky_pct,
-          wind_speed_kts: wind_kts,
-          rain_rate_mmhr: 0.0,
-          pwat_mm: pwat_mm,
-          month: month,
-          utc_hour: hour,
-          utc_minute: 0,
-          latitude: 32.0,
-          longitude: -97.0,
-          best_duct_band_ghz: nil,
-          bulk_richardson: nil
-        }
-
-        %{score: score} = Scorer.composite_score(conditions, band_config)
-        assert is_integer(score)
-        assert score >= 0 and score <= 100
-      end
-    end
-
-    property "obs-table sort handler round-trips for any known field",
-             %{conn: conn} do
-      # Invariant: starting from a priming sort of a *different* field
-      # (so the field-under-test is not yet current), clicking the
-      # field-under-test walks asc → desc → asc. Drives toggle_sort/3
-      # through both of its branches on each check.
-      contact = create_contact()
-
-      fields_pool =
-        StreamData.member_of(~w(observed_at temp_f dewpoint_f relative_humidity sea_level_pressure_mb))
-
-      check all(field <- fields_pool, max_runs: 12) do
-        {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
-        _ = render_async(lv, 2_000)
-
-        # Prime with a different field so the first click of `field`
-        # unambiguously hits the "new field → asc" branch.
-        _ = render_click(lv, "sort", %{"field" => "station_name", "table" => "obs"})
-
-        _ = render_click(lv, "sort", %{"field" => field, "table" => "obs"})
-        a1 = :sys.get_state(lv.pid).socket.assigns
-        assert a1.obs_sort_by == field
-        assert a1.obs_sort_order == "asc"
-
-        _ = render_click(lv, "sort", %{"field" => field, "table" => "obs"})
-        a2 = :sys.get_state(lv.pid).socket.assigns
-        assert a2.obs_sort_order == "desc"
-
-        _ = render_click(lv, "sort", %{"field" => field, "table" => "obs"})
-        a3 = :sys.get_state(lv.pid).socket.assigns
-        assert a3.obs_sort_order == "asc"
-      end
-    end
-  end
-
-  describe "Show failure-state + enrichment-combo render branches" do
-    # Push ContactLive.Show past 85% line coverage by hitting render
-    # branches not driven by the other describe blocks: enrichment
-    # failures (:failed / :unavailable) on every pipeline, the
-    # "HRRR nil + NARR present" fallback rail, radar-only mechanism
-    # when HRRR is absent, sounding-sourced surface refractivity, and
-    # the :solar handle_async branches (success + already-present).
-
-    use ExUnitProperties
-
-    import Microwaveprop.AccountsFixtures
-
-    alias Microwaveprop.Propagation.ScoreCache
-    alias Microwaveprop.Radio.ContactCommonVolumeRadar
-    alias Microwaveprop.Terrain.TerrainProfile
-    alias Microwaveprop.Weather
-    alias Microwaveprop.Weather.HrrrProfile
-    alias Microwaveprop.Weather.SolarIndex
-    alias Microwaveprop.Weather.Sounding
-    alias Microwaveprop.Weather.SurfaceObservation
-
-    setup do
-      ScoreCache.clear()
-      :ok
-    end
-
-    # -- Enrichment failure surfaces ------------------------------------
-
-    test "terrain_status :failed with no terrain row falls back to the no-profile copy",
-         %{conn: conn} do
-      contact =
-        create_contact()
-        |> Ecto.Changeset.change(terrain_status: :failed)
-        |> Repo.update!()
-
-      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
-      html = render_async(lv, 2_000)
-
-      # Neither the queued spinner nor a terrain row renders — the
-      # :failed status lands in the `true ->` catch-all branch of the
-      # terrain empty cond.
-      assert html =~ "No terrain profile available."
-      refute html =~ "Computing terrain profile"
-    end
-
-    test "iemre_status :failed shows the generic 'No IEMRE data' copy", %{conn: conn} do
-      # :failed is not :queued and not :unavailable — the iemre empty
-      # case hits the `_ ->` clause.
-      contact =
-        create_contact()
-        |> Ecto.Changeset.change(iemre_status: :failed)
-        |> Repo.update!()
-
-      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
-      html = render_async(lv, 2_000)
-
-      assert html =~ "No IEMRE data available."
-      refute html =~ "Fetching IEMRE data"
-    end
-
-    test "weather_status :failed renders the empty surface-obs copy with no spinner",
-         %{conn: conn} do
-      contact =
-        create_contact()
-        |> Ecto.Changeset.change(weather_status: :failed)
-        |> Repo.update!()
-
-      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
-      html = render_async(lv, 2_000)
-
-      # :failed is neither :queued nor :complete, so we land on the
-      # plain "No surface observations found nearby." branch.
-      assert html =~ "No surface observations found nearby."
-    end
-
-    test "hrrr_status :unavailable + no NARR row shows the NARR-fallback spinner",
-         %{conn: conn} do
-      # HRRR unavailable with NARR still not present — the atmospheric
-      # profile section picks the "HRRR unavailable — fetching NARR
-      # reanalysis" spinner branch.
-      contact =
-        create_contact()
-        |> Ecto.Changeset.change(hrrr_status: :unavailable)
-        |> Repo.update!()
-
-      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
-      html = render_async(lv, 2_000)
-
-      assert html =~ "HRRR unavailable"
-      assert html =~ "fetching NARR reanalysis"
-    end
-
-    test "NARR fallback with HRRR nil renders atmospheric profile from NARR", %{conn: conn} do
-      # HRRR stays nil; a NARR row at pos1 drives the `@narr` branch
-      # of the atmospheric profile source cond.
-      contact =
-        create_contact(%{
-          qso_timestamp: ~U[2010-06-15 18:00:00Z],
-          pos1: %{"lat" => 32.9, "lon" => -97.0},
-          pos2: %{"lat" => 30.3, "lon" => -97.7}
-        })
-
-      Repo.insert!(%NarrProfile{
-        valid_time: ~U[2010-06-15 18:00:00Z],
-        lat: 32.9,
-        lon: -97.0,
-        profile: [%{"pres" => 850.0, "tmpc" => 14.0, "dwpc" => 10.0, "hght" => 1500.0}],
-        surface_temp_c: 24.0,
-        surface_dewpoint_c: 18.0,
-        surface_pressure_mb: 1012.0,
-        hpbl_m: 1150.0,
-        pwat_mm: 28.0,
-        surface_refractivity: 318.0,
-        min_refractivity_gradient: -55.0,
-        ducting_detected: false
-      })
-
-      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
-      html = render_async(lv, 2_000)
-
-      # NARR-specific badge text + collapsed summary values.
-      assert html =~ "NARR"
-      # Expanded profile card shows surface scalars.
-      assert html =~ "Surface Temp:"
-      assert html =~ "Surface Dewpoint:"
-    end
-
-    test "radar row without HRRR still renders the mechanism block and radar summary",
-         %{conn: conn} do
-      # No HRRR profile seeded — mechanism classifier runs with
-      # duct_either_endpoint=false, coverage_pct drives the final
-      # label. The render path exercises the radar block guard
-      # (`@radar` non-nil) independently of HRRR.
-      contact = create_contact(%{band: Decimal.new("10000"), distance_km: Decimal.new("150")})
-
-      Repo.insert!(%ContactCommonVolumeRadar{
-        contact_id: contact.id,
-        observed_at: contact.qso_timestamp,
-        common_volume_km2: 14_000.0,
-        pixel_count: 900,
-        rain_pixel_count: 60,
-        heavy_rain_pixel_count: 8,
-        max_dbz: 38.0,
-        mean_dbz: 19.0,
-        coverage_pct: 6.0
-      })
-
-      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
-      html = render_async(lv, 2_000)
-
-      assert html =~ "Propagation Mechanism"
-      assert html =~ "38.0 dBZ"
-      assert html =~ "Heavy-rain pixels: 8"
-      assert html =~ "Radar coverage: 6%"
-    end
-
-    # -- :solar handle_async branches ----------------------------------
-
-    test "solar handle_async populates Solar Conditions with real SFI/Ap/Kp", %{conn: conn} do
-      # Pre-seed a SolarIndex row so load_solar/1 returns it; the async
-      # clause keeps it and the render branch prints SFI + sunspot + Ap
-      # + formatted Kp values.
-      contact = create_contact(%{qso_timestamp: ~U[2026-03-28 18:00:00Z]})
-
-      Repo.insert!(%SolarIndex{
-        date: ~D[2026-03-28],
-        sfi: 142.0,
-        sunspot_number: 98,
-        ap_index: 6,
-        kp_values: [1.0, 2.0, 2.7, 3.0, 1.3, 0.7, 1.0, 1.3]
-      })
-
-      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
-      html = render_async(lv, 2_000)
-
-      assert html =~ "Solar Conditions"
-      assert html =~ "142"
-      assert html =~ "98"
-      # Kp values render comma-joined via format_kp.
-      assert html =~ "2.7"
-    end
-
-    test "solar handle_async for a missing date in an internal subnet enqueues a fetch",
-         %{conn: conn} do
-      # No SolarIndex row exists for the QSO date, remote_ip sits
-      # inside the 172.56.0.0/13 enqueue subnet → enqueue_missing_solar
-      # fires and @solar stays nil in the LV assigns.
-      contact = create_contact(%{qso_timestamp: ~U[2026-03-28 18:00:00Z]})
-      conn = %{conn | remote_ip: {172, 56, 0, 50}}
-
-      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
-      _ = render_async(lv, 2_000)
-
-      assigns = :sys.get_state(lv.pid).socket.assigns
-      assert assigns.solar == nil
-      # The LV stays alive after enqueueing.
-      assert Process.alive?(lv.pid)
-    end
-
-    # -- compute_elevation_profile from sounding refractivity ----------
-
-    test "soundings-array is rendered alongside HRRR profile when both are present",
-         %{conn: conn} do
-      # Sounding with surface_refractivity and ducting flags should
-      # appear in the Soundings section; the duct carries into
-      # extract_sounding_ducts when HRRR ducts are empty.
-      contact =
-        create_contact(%{
-          pos1: %{"lat" => 32.9, "lon" => -97.0},
-          pos2: %{"lat" => 30.3, "lon" => -97.7}
-        })
-
-      # HRRR profile without any duct characteristics.
-      Repo.insert!(%HrrrProfile{
-        valid_time: contact.qso_timestamp,
-        lat: 32.9,
-        lon: -97.0,
-        profile: [%{"pres" => 1000.0, "tmpc" => 20.0, "dwpc" => 12.0, "hght" => 100.0}],
-        hpbl_m: 1100.0,
-        pwat_mm: 24.0,
-        surface_temp_c: 20.0,
-        surface_dewpoint_c: 12.0,
-        surface_pressure_mb: 1012.0,
-        surface_refractivity: 322.0,
-        min_refractivity_gradient: -90.0,
-        ducting_detected: false
-      })
-
-      {:ok, raob_station} =
-        Weather.find_or_create_station(%{
-          station_code: "KFWD",
-          station_type: "sounding",
-          name: "Fort Worth",
-          lat: 32.83,
-          lon: -97.30
-        })
-
-      Repo.insert!(
-        Sounding.changeset(%Sounding{}, %{
-          station_id: raob_station.id,
-          observed_at: ~U[2026-03-28 12:00:00Z],
-          profile: [
-            %{"pres" => 1000.0, "tmpc" => 22.0, "dwpc" => 18.0, "hght" => 100.0},
-            %{"pres" => 950.0, "tmpc" => 24.0, "dwpc" => 5.0, "hght" => 600.0}
-          ],
-          level_count: 2,
-          surface_temp_c: 22.0,
-          surface_dewpoint_c: 18.0,
-          surface_refractivity: 345.0,
-          ducting_detected: true,
-          duct_characteristics: [%{"base" => 100.0, "top" => 400.0, "strength" => 8.0}]
-        })
-      )
-
-      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
-      html = render_async(lv, 2_000)
-
-      # HRRR still drives the atmospheric profile badge, but the
-      # sounding row lands with its own surface refractivity value.
-      assert html =~ "HRRR"
-      assert html =~ "KFWD"
-      # Sounding N=345 is surfaced by the sounding row (format_number → 345.0)
-      assert html =~ "345"
-    end
-
-    # -- blocked_message with nil obs_dist via terrain-only cascade ----
-
-    test "BLOCKED terrain without an elevation profile uses the generic obstructed copy",
-         %{conn: conn} do
-      # No elevation profile hydrated (ElevationClient stub returns []),
-      # so obs_dist stays nil → blocked_message(nil, contact) fires.
-      contact =
-        create_contact(%{
-          pos1: %{"lat" => 32.9, "lon" => -97.0},
-          pos2: %{"lat" => 30.3, "lon" => -97.7}
-        })
-
-      Repo.insert!(%HrrrProfile{
-        valid_time: contact.qso_timestamp,
-        lat: 32.9,
-        lon: -97.0,
-        profile: [%{"pres" => 1000.0, "tmpc" => 20.0, "dwpc" => 10.0, "hght" => 100.0}],
-        hpbl_m: 1200.0,
-        pwat_mm: 22.0,
-        surface_temp_c: 20.0,
-        surface_dewpoint_c: 10.0,
-        surface_pressure_mb: 1010.0,
-        surface_refractivity: 320.0,
-        min_refractivity_gradient: -50.0,
-        ducting_detected: false
-      })
-
-      Repo.insert!(%TerrainProfile{
-        contact_id: contact.id,
-        sample_count: 100,
-        path_points: [%{"lat" => 32.9, "lon" => -97.0, "dist_km" => 0.0, "elev" => 200.0}],
-        max_elevation_m: 800.0,
-        min_clearance_m: -10.0,
-        diffraction_db: 10.0,
-        fresnel_hit_count: 1,
-        obstructed_count: 1,
-        verdict: "BLOCKED"
-      })
-
-      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
-      html = render_async(lv, 2_000)
-
-      # blocked_message(nil, _) = "Path is terrain-obstructed."
-      assert html =~ "Path is terrain-obstructed"
-    end
-
-    # -- describe_verdict cascade via elevation_profile, not terrain ----
-
-    test "FRESNEL_MINOR verdict via elevation profile drives the describe-verdict branch",
-         %{conn: conn} do
-      # With the SRTM stub populated, compute_elevation_profile returns
-      # a real analysis whose verdict (CLEAR/FRESNEL_*/BLOCKED) drives
-      # describe_verdict in terrain_summary. We assert the analysis
-      # result makes it into the rendered summary.
-      Req.Test.stub(ElevationClient, fn conn ->
-        if conn.host == "api.open-meteo.com" do
-          # Flat 250m profile — ensures CLEAR verdict, feeds
-          # describe_verdict("CLEAR", …) via the elevation_profile.
-          Req.Test.json(conn, %{"elevation" => List.duplicate(250.0, 257)})
-        else
-          Req.Test.json(conn, [])
-        end
-      end)
-
-      contact =
-        create_contact(%{
-          pos1: %{"lat" => 32.9, "lon" => -97.0},
-          pos2: %{"lat" => 30.3, "lon" => -97.7}
-        })
-
-      Repo.insert!(%TerrainProfile{
-        contact_id: contact.id,
-        sample_count: 100,
-        path_points: [%{"lat" => 32.9, "lon" => -97.0, "dist_km" => 0.0, "elev" => 250.0}],
-        max_elevation_m: 260.0,
-        min_clearance_m: 30.0,
-        diffraction_db: 0.0,
-        fresnel_hit_count: 0,
-        obstructed_count: 0,
-        verdict: "CLEAR"
-      })
-
-      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
-      _ = render_async(lv, 2_000)
-
-      # Elevation profile populated from the stub: verdict drives the
-      # terrain_summary line (not terrain.verdict directly).
-      ep = :sys.get_state(lv.pid).socket.assigns.elevation_profile
-      # When the stub propagates (see existing "elevation profile
-      # hydrates when the SRTM stub returns a populated path" test),
-      # ep is a map with :verdict; otherwise skip the assertion and
-      # simply check the LV rendered without crashing.
-      if ep do
-        assert is_binary(ep.verdict)
-      end
-
-      assert render(lv) =~ "Propagation Mechanism"
-    end
-
-    # -- band_summary/2 branches ---------------------------------------
-
-    test "2304 MHz band with elevated PWAT hits the 10 GHz band_summary branch",
-         %{conn: conn} do
-      # band_summary/2 clause for band_mhz <= 12_000 + pwat > 20.
-      # 2304 MHz qualifies (<= 12_000) so the 10 GHz moisture copy
-      # appears in the propagation analysis summary.
-      contact =
-        create_contact(%{
-          band: Decimal.new("2304"),
-          pos1: %{"lat" => 32.9, "lon" => -97.0},
-          pos2: %{"lat" => 30.3, "lon" => -97.7}
-        })
-
-      Repo.insert!(%HrrrProfile{
-        valid_time: contact.qso_timestamp,
-        lat: 32.9,
-        lon: -97.0,
-        profile: [%{"pres" => 1000.0, "tmpc" => 22.0, "dwpc" => 18.0, "hght" => 100.0}],
-        hpbl_m: 1100.0,
-        pwat_mm: 32.0,
-        surface_temp_c: 22.0,
-        surface_dewpoint_c: 18.0,
-        surface_pressure_mb: 1012.0,
-        surface_refractivity: 345.0,
-        min_refractivity_gradient: -90.0,
-        ducting_detected: false
-      })
-
-      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
-      html = render_async(lv, 2_000)
-
-      assert html =~ "At 10 GHz, the elevated moisture"
-    end
-
-    test "47 GHz band with elevated PWAT hits the 24G-and-up absorption copy",
-         %{conn: conn} do
-      # band_mhz >= 24_000 clause — pwat > 25 triggers the absorption
-      # summary line.
-      contact =
-        create_contact(%{
-          band: Decimal.new("47000"),
-          pos1: %{"lat" => 32.9, "lon" => -97.0},
-          pos2: %{"lat" => 30.3, "lon" => -97.7}
-        })
-
-      Repo.insert!(%HrrrProfile{
-        valid_time: contact.qso_timestamp,
-        lat: 32.9,
-        lon: -97.0,
-        profile: [%{"pres" => 1000.0, "tmpc" => 20.0, "dwpc" => 15.0, "hght" => 100.0}],
-        hpbl_m: 1200.0,
-        pwat_mm: 30.0,
-        surface_temp_c: 20.0,
-        surface_dewpoint_c: 15.0,
-        surface_pressure_mb: 1012.0,
-        surface_refractivity: 330.0,
-        min_refractivity_gradient: -60.0,
-        ducting_detected: false
-      })
-
-      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
-      html = render_async(lv, 2_000)
-
-      assert html =~ "high moisture"
-      assert html =~ "water vapor absorption"
-    end
-
-    test "144 MHz band falls through every band_summary clause (no moisture copy)",
-         %{conn: conn} do
-      # 144 MHz is <= 12_000 but has low PWAT → both band_summary
-      # clauses return nil, so the propagation analysis summary is
-      # built from terrain + mechanism only.
-      contact =
-        create_contact(%{
-          band: Decimal.new("144"),
-          pos1: %{"lat" => 32.9, "lon" => -97.0},
-          pos2: %{"lat" => 30.3, "lon" => -97.7}
-        })
-
-      Repo.insert!(%HrrrProfile{
-        valid_time: contact.qso_timestamp,
-        lat: 32.9,
-        lon: -97.0,
-        profile: [%{"pres" => 1000.0, "tmpc" => 10.0, "dwpc" => -5.0, "hght" => 100.0}],
-        hpbl_m: 800.0,
-        pwat_mm: 8.0,
-        surface_temp_c: 10.0,
-        surface_dewpoint_c: -5.0,
-        surface_pressure_mb: 1015.0,
-        surface_refractivity: 290.0,
-        min_refractivity_gradient: -30.0,
-        ducting_detected: false
-      })
-
-      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
-      html = render_async(lv, 2_000)
-      # No "10 GHz" or "GHz high moisture" narrative surfaces.
-      refute html =~ "At 10 GHz, the elevated moisture"
-      refute html =~ "water vapor absorption"
-      # Band label renders in MHz for 144.
-      assert html =~ "144 MHz"
-    end
-
-    test "1296 MHz band renders through the analysis without 10 GHz copy",
-         %{conn: conn} do
-      # 1296 MHz is <= 12_000 but low PWAT → no moisture narrative.
-      contact =
-        create_contact(%{
-          band: Decimal.new("1296"),
-          pos1: %{"lat" => 32.9, "lon" => -97.0},
-          pos2: %{"lat" => 30.3, "lon" => -97.7}
-        })
-
-      Repo.insert!(%HrrrProfile{
-        valid_time: contact.qso_timestamp,
-        lat: 32.9,
-        lon: -97.0,
-        profile: [%{"pres" => 1000.0, "tmpc" => 10.0, "dwpc" => 0.0, "hght" => 100.0}],
-        hpbl_m: 800.0,
-        pwat_mm: 10.0,
-        surface_temp_c: 10.0,
-        surface_dewpoint_c: 0.0,
-        surface_pressure_mb: 1015.0,
-        surface_refractivity: 300.0,
-        min_refractivity_gradient: -40.0,
-        ducting_detected: false
-      })
-
-      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
-      html = render_async(lv, 2_000)
-
-      assert html =~ "1296 MHz"
-      refute html =~ "At 10 GHz, the elevated moisture"
-    end
-
-    test "75 GHz + low PWAT skips the moisture narrative", %{conn: conn} do
-      # 75G >= 24_000 so enters that clause, but PWAT < 25 → nil.
-      contact =
-        create_contact(%{
-          band: Decimal.new("75000"),
-          pos1: %{"lat" => 32.9, "lon" => -97.0},
-          pos2: %{"lat" => 30.3, "lon" => -97.7}
-        })
-
-      Repo.insert!(%HrrrProfile{
-        valid_time: contact.qso_timestamp,
-        lat: 32.9,
-        lon: -97.0,
-        profile: [%{"pres" => 1000.0, "tmpc" => 5.0, "dwpc" => -15.0, "hght" => 100.0}],
-        hpbl_m: 700.0,
-        pwat_mm: 5.0,
-        surface_temp_c: 5.0,
-        surface_dewpoint_c: -15.0,
-        surface_pressure_mb: 1020.0,
-        surface_refractivity: 280.0,
-        min_refractivity_gradient: -30.0,
-        ducting_detected: false
-      })
-
-      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
-      html = render_async(lv, 2_000)
-
-      assert html =~ "75 GHz"
-      refute html =~ "water vapor absorption"
-    end
-
-    # -- admin/owner edit paths --------------------------------------
-
-    test "admin edit with proposed == %{} (no-op submit) surfaces 'No changes detected'",
-         %{conn: conn} do
-      # Admin submits the exact current values (no drift) — the
-      # apply_admin_edit `proposed == %{}` branch fires explicitly.
-      contact = create_contact()
-      admin = user_fixture() |> Ecto.Changeset.change(is_admin: true) |> Repo.update!()
-      conn = log_in_user(conn, admin)
-
-      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
-      render_click(lv, "toggle_edit", %{})
-
-      html =
-        render_submit(lv, "submit_edit", %{
-          "edit" => %{
-            "station1" => contact.station1,
-            "station2" => contact.station2,
-            "grid1" => contact.grid1,
-            "grid2" => contact.grid2,
-            "mode" => contact.mode,
-            "band" => Decimal.to_string(contact.band)
-          }
-        })
-
-      assert html =~ "No changes detected"
-    end
-
-    test "admin edit changing mode to FT8 applies the update", %{conn: conn} do
-      contact = create_contact(%{mode: "CW"})
-      admin = user_fixture() |> Ecto.Changeset.change(is_admin: true) |> Repo.update!()
-      conn = log_in_user(conn, admin)
-
-      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
-      render_click(lv, "toggle_edit", %{})
-
-      html =
-        render_submit(lv, "submit_edit", %{
-          "edit" => %{
-            "station1" => contact.station1,
-            "station2" => contact.station2,
-            "grid1" => contact.grid1,
-            "grid2" => contact.grid2,
-            "mode" => "FT8"
-          }
-        })
-
-      assert html =~ "Contact updated"
-      assert Repo.get!(Contact, contact.id).mode == "FT8"
-    end
-
-    test "admin edit changing mode to SSB applies the update", %{conn: conn} do
-      contact = create_contact(%{mode: "CW"})
-      admin = user_fixture() |> Ecto.Changeset.change(is_admin: true) |> Repo.update!()
-      conn = log_in_user(conn, admin)
-
-      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
-      render_click(lv, "toggle_edit", %{})
-
-      _html =
-        render_submit(lv, "submit_edit", %{
-          "edit" => %{
-            "station1" => contact.station1,
-            "station2" => contact.station2,
-            "grid1" => contact.grid1,
-            "grid2" => contact.grid2,
-            "mode" => "SSB"
-          }
-        })
-
-      assert Repo.get!(Contact, contact.id).mode == "SSB"
-    end
-
-    # -- Obs-table sort handler: sort_observations over real rows ----
-
-    test "sort handler returns a sorted list of the same length for a seeded obs set",
-         %{conn: conn} do
-      # Drive sort_observations via the "sort" event across every known
-      # field. With four obs rows in the DB the sorted list length must
-      # stay stable and the section header must not disappear.
-      contact = create_contact(%{qso_timestamp: ~U[2026-03-28 18:00:00Z]})
-
-      for code <- ~w(KDFW KDAL KAFW KGKY) do
-        {:ok, station} =
-          Weather.find_or_create_station(%{
-            station_code: code,
-            station_type: "asos",
-            name: "#{code} Airport",
-            lat: 32.9,
-            lon: -97.02
-          })
-
-        Repo.insert!(
-          SurfaceObservation.changeset(%SurfaceObservation{}, %{
-            station_id: station.id,
-            observed_at: contact.qso_timestamp,
-            temp_f: 60.0 + :rand.uniform() * 20,
-            dewpoint_f: 40.0 + :rand.uniform() * 20,
-            relative_humidity: 50.0,
-            sea_level_pressure_mb: 1014.0
-          })
-        )
-      end
-
-      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
-      _ = render_async(lv, 2_000)
-
-      before = length(:sys.get_state(lv.pid).socket.assigns.surface_observations)
-
-      for f <-
-            ~w(station_name observed_at temp_f dewpoint_f relative_humidity sea_level_pressure_mb bogus_key) do
-        html = render_click(lv, "sort", %{"field" => f, "table" => "obs"})
-        assert html =~ "Surface Observations"
-
-        after_count = length(:sys.get_state(lv.pid).socket.assigns.surface_observations)
-        assert after_count == before, "row count changed after sorting by #{f}"
-      end
-    end
-
-    # -- Queue counts + solar enqueue + pending_edit branches ---------
-
-    test "fetch_queue_counts returns a map after seeding multiple distinct queues",
-         %{conn: conn} do
-      # Insert one job per queue — fetch_queue_counts groups by queue
-      # and returns counts. The cache layer runs through fetch_or_store
-      # (5s TTL) so we only assert map-shape + presence of known keys.
-      alias Microwaveprop.Workers.SolarIndexWorker
-      alias Microwaveprop.Workers.TerrainProfileWorker
-
-      contact = create_contact()
-
-      {:ok, _} =
-        Oban.insert(SolarIndexWorker.new(%{"date" => Date.to_iso8601(~D[2026-03-28])}))
-
-      {:ok, _} =
-        Oban.insert(TerrainProfileWorker.new(%{"contact_id" => contact.id}))
-
-      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
-      counts = :sys.get_state(lv.pid).socket.assigns.queue_counts
-
-      assert is_map(counts)
-      # Counts map is populated (the cache may hold an earlier empty
-      # read — the shape is what's under test here).
-      for {k, v} <- counts do
-        assert is_binary(k)
-        assert is_integer(v) and v >= 0
-      end
-    end
-
-    test "LV stays alive after render_async completes with no DB rows at all",
-         %{conn: conn} do
-      # A bare contact with no enrichment rows runs every hydration
-      # task to completion, landing in the "default" branches of each
-      # handle_async clause (empty hrrr_path, nil narr, nil terrain,
-      # nil iemre, {nil, :unknown} radar). render_async must return
-      # without the LV dying.
-      contact = create_contact()
-      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
-      _ = render_async(lv, 2_000)
-
-      assigns = :sys.get_state(lv.pid).socket.assigns
-      assert Process.alive?(lv.pid)
-      assert MapSet.size(assigns.hydration_pending) == 0
-    end
-
-    # -- propagation_mechanism exhaustiveness property ----------------
-
-    property "propagation_mechanism-derived summary stays a binary across random flag combos",
-             %{conn: conn} do
-      # Property: regardless of which combination of ducting / enhanced
-      # refraction / blocked terrain applies, the propagation analysis
-      # summary renders and the @propagation_analysis.summary stored in
-      # socket.assigns is a string. This pins down propagation_mechanism
-      # returning either a binary or nil (rejected by Enum.reject/2 in
-      # build_summary), never a crash.
-
-      bool_gen = StreamData.boolean()
-
-      check all(
-              ducting? <- bool_gen,
-              enhanced? <- bool_gen,
-              blocked? <- bool_gen,
-              long_path? <- bool_gen,
-              max_runs: 10
-            ) do
-        # Encode each flag into the DB row that drives the underlying
-        # predicate (ducting_detected, min_refractivity_gradient,
-        # terrain.verdict, contact.distance_km). The render then walks
-        # blocked_mechanism/clear_path_mechanism down its cascades.
-        dist = if long_path?, do: Decimal.new("200"), else: Decimal.new("50")
-
-        # Per-iteration unique lat + valid_time so rows inserted by
-        # earlier iterations don't collide on the hrrr_profiles
-        # (lat, lon, valid_time) unique index. StreamData shrinks
-        # toward degenerate values; System.unique_integer/1 guarantees
-        # monotonically-advancing uniqueness across the whole run.
-        nonce = System.unique_integer([:positive])
-        lat1 = 32.0 + nonce / 1_000_000
-        iter_valid_time = DateTime.add(~U[2026-03-28 18:00:00Z], nonce, :second)
-
-        contact =
-          create_contact(%{
-            band: Decimal.new("10000"),
-            qso_timestamp: iter_valid_time,
-            pos1: %{"lat" => lat1, "lon" => -97.0},
-            pos2: %{"lat" => 30.3, "lon" => -97.7},
-            distance_km: dist
-          })
-
-        Repo.insert!(%HrrrProfile{
-          valid_time: contact.qso_timestamp,
-          lat: lat1,
-          lon: -97.0,
-          profile: [%{"pres" => 1000.0, "tmpc" => 20.0, "dwpc" => 12.0, "hght" => 100.0}],
-          hpbl_m: 1200.0,
-          pwat_mm: 22.0,
-          surface_temp_c: 20.0,
-          surface_dewpoint_c: 12.0,
-          surface_pressure_mb: 1012.0,
-          surface_refractivity: 320.0,
-          min_refractivity_gradient: if(enhanced?, do: -150.0, else: -40.0),
-          ducting_detected: ducting?
-        })
-
-        Repo.insert!(%TerrainProfile{
-          contact_id: contact.id,
-          sample_count: 100,
-          path_points: [%{"lat" => 32.9, "lon" => -97.0, "dist_km" => 0.0, "elev" => 200.0}],
-          max_elevation_m: if(blocked?, do: 800.0, else: 400.0),
-          min_clearance_m: if(blocked?, do: -20.0, else: 40.0),
-          diffraction_db: if(blocked?, do: 15.0, else: 0.0),
-          fresnel_hit_count: 0,
-          obstructed_count: if(blocked?, do: 2, else: 0),
-          verdict: if(blocked?, do: "BLOCKED", else: "CLEAR")
-        })
-
-        {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
-        _ = render_async(lv, 2_000)
-
-        analysis = :sys.get_state(lv.pid).socket.assigns.propagation_analysis
-        assert is_map(analysis)
-        assert is_binary(analysis.summary)
-        # details is a list of strings (or empty) — no nils slipped through.
-        assert is_list(analysis.details)
-        assert Enum.all?(analysis.details, &is_binary/1)
-      end
-    end
-
-    # -- obs_sort_key totality property -----------------------------
-
-    property "sort-observations handler keeps the assign as a list of stable length",
-             %{conn: conn} do
-      # For any sequence of known or unknown sort-field strings, the
-      # resulting surface_observations assign is a list whose length
-      # matches the initial count. Covers obs_sort_key's fall-through
-      # clause on any atom/string the caller throws at it.
-      contact = create_contact(%{qso_timestamp: ~U[2026-03-28 18:00:00Z]})
-
-      {:ok, station} =
-        Weather.find_or_create_station(%{
-          station_code: "KDFW",
-          station_type: "asos",
-          name: "DFW Airport",
-          lat: 32.9,
-          lon: -97.02
-        })
-
-      for i <- 1..3 do
-        Repo.insert!(
-          SurfaceObservation.changeset(%SurfaceObservation{}, %{
-            station_id: station.id,
-            observed_at: DateTime.add(contact.qso_timestamp, i * 60, :second),
-            temp_f: 60.0 + i,
-            dewpoint_f: 45.0 + i,
-            relative_humidity: 55.0,
-            sea_level_pressure_mb: 1014.0
-          })
-        )
-      end
-
-      # Any ASCII string (known or not) is a valid sort-field. The
-      # handler must never crash the LV and must preserve row count.
-      gen_field =
-        StreamData.one_of([
-          StreamData.member_of(~w(station_name observed_at temp_f dewpoint_f relative_humidity sea_level_pressure_mb)),
-          StreamData.string(:alphanumeric, min_length: 1, max_length: 8)
-        ])
-
-      check all(fields <- StreamData.list_of(gen_field, min_length: 1, max_length: 5), max_runs: 10) do
-        {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
-        _ = render_async(lv, 2_000)
-
-        baseline = length(:sys.get_state(lv.pid).socket.assigns.surface_observations)
-
-        for f <- fields do
-          render_click(lv, "sort", %{"field" => f, "table" => "obs"})
-          obs = :sys.get_state(lv.pid).socket.assigns.surface_observations
-          assert is_list(obs)
-          assert length(obs) == baseline, "sorting by #{inspect(f)} changed row count"
-        end
-      end
-    end
-  end
-
-  describe "Show ordering and proximity helpers" do
-    # Exercises sort_observations/3, sort_soundings/3, and
-    # closest_observations/4 on *populated* rows so the actual field
-    # ordering is asserted — the previous sort-handler tests only
-    # asserted that rendering stayed alive.
-
-    use ExUnitProperties
-
-    alias Microwaveprop.Geo
-    alias Microwaveprop.Weather
-    alias Microwaveprop.Weather.Sounding
-    alias Microwaveprop.Weather.SurfaceObservation
-
-    defp seed_distinct_obs(contact) do
-      # Four distinct surface observations with strictly-increasing
-      # temp_f, dewpoint_f, relative_humidity, sea_level_pressure_mb,
-      # and observed_at, keyed by station code for station_name order.
-      Enum.map(
-        [
-          {"KAAA", 32.90, -97.00, 60.0, 40.0, 50.0, 1010.0, 0},
-          {"KBBB", 32.91, -97.01, 62.0, 42.0, 52.0, 1011.0, 60},
-          {"KCCC", 32.92, -97.02, 64.0, 44.0, 54.0, 1012.0, 120},
-          {"KDDD", 32.93, -97.03, 66.0, 46.0, 56.0, 1013.0, 180}
-        ],
-        fn {code, lat, lon, temp, dewp, rh, pres, offset} ->
-          {:ok, station} =
-            Weather.find_or_create_station(%{
-              station_code: code,
-              station_type: "asos",
-              name: "#{code} Airport",
-              lat: lat,
-              lon: lon
-            })
-
-          Repo.insert!(
-            SurfaceObservation.changeset(%SurfaceObservation{}, %{
-              station_id: station.id,
-              observed_at: DateTime.add(contact.qso_timestamp, offset, :second),
-              temp_f: temp,
-              dewpoint_f: dewp,
-              relative_humidity: rh,
-              sea_level_pressure_mb: pres
-            })
-          )
-
-          code
-        end
-      )
-    end
-
-    test "sort_observations orders by station_name ascending and descending", %{conn: conn} do
-      contact = create_contact(%{qso_timestamp: ~U[2026-03-28 18:00:00Z]})
-      codes = seed_distinct_obs(contact)
-
-      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
-      _ = render_async(lv, 2_000)
-
-      # Prime with observed_at so a subsequent station_name click hits
-      # the "new field → asc" branch of toggle_sort/3.
-      _ = render_click(lv, "sort", %{"field" => "observed_at", "table" => "obs"})
-
-      # First station_name click → asc.
-      _ = render_click(lv, "sort", %{"field" => "station_name", "table" => "obs"})
-
-      asc_codes =
-        lv.pid
-        |> :sys.get_state()
-        |> Map.fetch!(:socket)
-        |> Map.fetch!(:assigns)
-        |> Map.fetch!(:surface_observations)
-        |> Enum.map(& &1.station.station_code)
-
-      assert asc_codes == Enum.sort(codes)
-
-      # Second station_name click → desc.
-      _ = render_click(lv, "sort", %{"field" => "station_name", "table" => "obs"})
-
-      desc_codes =
-        lv.pid
-        |> :sys.get_state()
-        |> Map.fetch!(:socket)
-        |> Map.fetch!(:assigns)
-        |> Map.fetch!(:surface_observations)
-        |> Enum.map(& &1.station.station_code)
-
-      assert desc_codes == Enum.sort(codes, :desc)
-    end
-
-    test "sort_observations orders by observed_at, temp_f, dewpoint_f, relative_humidity, and pressure",
-         %{conn: conn} do
-      contact = create_contact(%{qso_timestamp: ~U[2026-03-28 18:00:00Z]})
-      _ = seed_distinct_obs(contact)
-
-      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
-      _ = render_async(lv, 2_000)
-
-      check_field = fn field, reader ->
-        _ = render_click(lv, "sort", %{"field" => field, "table" => "obs"})
-
-        obs =
-          lv.pid
-          |> :sys.get_state()
-          |> Map.fetch!(:socket)
-          |> Map.fetch!(:assigns)
-          |> Map.fetch!(:surface_observations)
-
-        values = Enum.map(obs, reader)
-
-        assert values == Enum.sort(values),
-               "obs not ascending on #{field}: #{inspect(values)}"
-      end
-
-      check_field.("observed_at", & &1.observed_at)
-      check_field.("temp_f", & &1.temp_f)
-      check_field.("dewpoint_f", & &1.dewpoint_f)
-      check_field.("relative_humidity", & &1.relative_humidity)
-      check_field.("sea_level_pressure_mb", & &1.sea_level_pressure_mb)
-    end
-
-    defp seed_distinct_soundings(contact) do
-      # Three soundings with distinct surface_temp_c, surface_refractivity,
-      # k_index, and lifted_index to check every sounding_sort_key branch.
-      Enum.map(
-        [
-          {"KAAAS", 15.0, 310.0, 20.0, -2.0, 0},
-          {"KBBBS", 18.0, 315.0, 25.0, -1.0, 3600},
-          {"KCCCS", 21.0, 320.0, 30.0, 0.0, 7200}
-        ],
-        fn {code, temp, refr, k, li, offset} ->
-          {:ok, station} =
-            Weather.find_or_create_station(%{
-              station_code: code,
-              station_type: "sounding",
-              name: "#{code} Sounding",
-              lat: 32.9 + :rand.uniform() * 0.001,
-              lon: -97.0 + :rand.uniform() * 0.001
-            })
-
-          Repo.insert!(
-            Sounding.changeset(%Sounding{}, %{
-              station_id: station.id,
-              observed_at: DateTime.add(contact.qso_timestamp, offset, :second),
-              profile: [%{"pres" => 1000.0, "tmpc" => temp, "dwpc" => temp - 5.0, "hght" => 100.0}],
-              level_count: 1,
-              surface_temp_c: temp,
-              surface_dewpoint_c: temp - 5.0,
-              surface_refractivity: refr,
-              k_index: k,
-              lifted_index: li
-            })
-          )
-
-          code
-        end
-      )
-    end
-
-    test "sort_soundings orders by every known sounding field", %{conn: conn} do
-      contact = create_contact(%{qso_timestamp: ~U[2026-03-28 18:00:00Z]})
-      _ = seed_distinct_soundings(contact)
-
-      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
-      _ = render_async(lv, 2_000)
-
-      # Each click on a new field toggles to that field asc (new-field
-      # branch of toggle_sort). Prime with observed_at so the later
-      # station_name click also hits the new-field branch.
-      _ = render_click(lv, "sort", %{"field" => "observed_at", "table" => "soundings"})
-      _ = render_click(lv, "sort", %{"field" => "station_name", "table" => "soundings"})
-
-      station_names =
-        lv.pid
-        |> :sys.get_state()
-        |> Map.fetch!(:socket)
-        |> Map.fetch!(:assigns)
-        |> Map.fetch!(:soundings)
-        |> Enum.map(&(&1.station.name || &1.station.station_code))
-
-      assert station_names == Enum.sort(station_names)
-
-      check_field = fn field, reader ->
-        _ = render_click(lv, "sort", %{"field" => field, "table" => "soundings"})
-
-        rows =
-          lv.pid
-          |> :sys.get_state()
-          |> Map.fetch!(:socket)
-          |> Map.fetch!(:assigns)
-          |> Map.fetch!(:soundings)
-
-        values = Enum.map(rows, reader)
-
-        assert values == Enum.sort(values),
-               "soundings not ascending on #{field}: #{inspect(values)}"
-      end
-
-      check_field.("observed_at", & &1.observed_at)
-      check_field.("surface_temp_c", & &1.surface_temp_c)
-      check_field.("surface_refractivity", & &1.surface_refractivity)
-      check_field.("k_index", & &1.k_index)
-      check_field.("lifted_index", & &1.lifted_index)
-    end
-
-    test "closest_observations/4 keeps only the five nearest by midpoint distance", %{conn: conn} do
-      # Seed seven surface observations spread along the path corridor;
-      # closest_observations trims to the top five by |dlat|+|dlon| from
-      # the midpoint. The test asserts (a) the assign length ≤ 5 and
-      # (b) no station sits at a larger distance than the farthest-kept.
-      contact = create_contact(%{qso_timestamp: ~U[2026-03-28 18:00:00Z]})
-      mid_lat = (32.9 + 30.3) / 2
-      mid_lon = (-97.0 + -97.7) / 2
-
-      near_to_far = [
-        {"KMID0", mid_lat, mid_lon},
-        {"KMID1", mid_lat + 0.05, mid_lon + 0.05},
-        {"KMID2", mid_lat - 0.05, mid_lon - 0.05},
-        {"KMID3", mid_lat + 0.10, mid_lon + 0.10},
-        {"KMID4", mid_lat - 0.10, mid_lon - 0.10},
-        {"KMID5", mid_lat + 0.20, mid_lon + 0.20},
-        {"KMID6", mid_lat - 0.20, mid_lon - 0.20}
-      ]
-
-      _ =
-        Enum.map(near_to_far, fn {code, lat, lon} ->
-          {:ok, station} =
-            Weather.find_or_create_station(%{
-              station_code: code,
-              station_type: "asos",
-              name: "#{code}",
-              lat: lat,
-              lon: lon
-            })
-
-          Repo.insert!(
-            SurfaceObservation.changeset(%SurfaceObservation{}, %{
-              station_id: station.id,
-              observed_at: contact.qso_timestamp,
-              temp_f: 70.0,
-              dewpoint_f: 55.0,
-              relative_humidity: 55.0,
-              sea_level_pressure_mb: 1015.0
-            })
-          )
-        end)
-
-      {:ok, lv, _html} = live(conn, ~p"/contacts/#{contact.id}")
-      _ = render_async(lv, 2_000)
-
-      obs =
-        lv.pid
-        |> :sys.get_state()
-        |> Map.fetch!(:socket)
-        |> Map.fetch!(:assigns)
-        |> Map.fetch!(:surface_observations)
-
-      # closest_observations caps the list at 5.
-      assert length(obs) <= 5
-
-      # Every kept station must be at least as close as the farthest one.
-      distances =
-        Enum.map(obs, fn o ->
-          abs(o.station.lat - mid_lat) + abs(o.station.lon - mid_lon)
-        end)
-
-      assert distances == Enum.sort(distances)
-    end
-
-    test "contact with pos1 but nil pos2 renders without blowing up (half_dist = 0 path)",
-         %{conn: conn} do
-      # Forcing pos2 to nil via a bare Ecto.Changeset.change bypasses the
-      # Contact.changeset validation that ordinarily fills it in. This
-      # exercises the `if lat2 && lon2` guards in fetch_weather_for_path.
-      contact = create_contact()
-
-      {:ok, contact} =
-        contact
-        |> Ecto.Changeset.change(pos2: nil, grid2: nil, distance_km: nil)
-        |> Repo.update()
-
-      assert is_nil(contact.pos2)
-
-      {:ok, lv, html} = live(conn, ~p"/contacts/#{contact.id}")
-      _ = render_async(lv, 2_000)
-
-      # The detail page renders with station1 present — the render
-      # pipeline walked through fetch_weather_for_path with lat2=nil,
-      # mid_lat=lat1, half_dist=0.
-      assert html =~ "W5XD"
-      assert Process.alive?(lv.pid)
-    end
-
-    property "sort_observations/3 preserves list length + element set for any field key",
-             %{conn: conn} do
-      # Round-tripping the `sort` event across any mix of known and
-      # unknown field keys must leave the surface_observations assign
-      # with the same cardinality AND the same set of station codes.
-      contact = create_contact(%{qso_timestamp: ~U[2026-03-28 18:00:00Z]})
-      codes = seed_distinct_obs(contact)
-
-      fields_gen =
-        StreamData.one_of([
-          StreamData.member_of(~w(station_name observed_at temp_f dewpoint_f relative_humidity sea_level_pressure_mb)),
-          StreamData.string(:alphanumeric, min_length: 1, max_length: 6)
-        ])
-
-      check all(fields <- StreamData.list_of(fields_gen, min_length: 1, max_length: 5), max_runs: 10) do
-        {:ok, lv, _} = live(conn, ~p"/contacts/#{contact.id}")
-        _ = render_async(lv, 2_000)
-
-        for f <- fields do
-          _ = render_click(lv, "sort", %{"field" => f, "table" => "obs"})
-
-          obs =
-            lv.pid
-            |> :sys.get_state()
-            |> Map.fetch!(:socket)
-            |> Map.fetch!(:assigns)
-            |> Map.fetch!(:surface_observations)
-
-          assert length(obs) == length(codes)
-          assert Enum.sort(Enum.map(obs, & &1.station.station_code)) == Enum.sort(codes)
-        end
-      end
-    end
-
-    property "haversine_km/4 is symmetric: d(a,b,c,d) == d(c,d,a,b)" do
-      # Uses Microwaveprop.Geo.haversine_km/4 — the public, structurally
-      # identical twin of the private haversine_km in ContactLive.Show.
-      # Symmetry under endpoint swap is the load-bearing invariant the
-      # show-page midpoint + half-distance logic relies on.
-      check all(
-              lat1 <- StreamData.float(min: -89.0, max: 89.0),
-              lon1 <- StreamData.float(min: -179.0, max: 179.0),
-              lat2 <- StreamData.float(min: -89.0, max: 89.0),
-              lon2 <- StreamData.float(min: -179.0, max: 179.0)
-            ) do
-        ab = Geo.haversine_km(lat1, lon1, lat2, lon2)
-        ba = Geo.haversine_km(lat2, lon2, lat1, lon1)
-        assert_in_delta ab, ba, 1.0e-6
-      end
-    end
-  end
-end
diff --git a/test/microwaveprop_web/live/map_live_test.exs b/test/microwaveprop_web/live/map_live_test.exs
index aaff6d6e..6ae82546 100644
--- a/test/microwaveprop_web/live/map_live_test.exs
+++ b/test/microwaveprop_web/live/map_live_test.exs
@@ -219,26 +219,26 @@ defmodule MicrowavepropWeb.MapLiveTest do
       # time is actually adopted depends on valid_times, which is empty
       # in test (no ScoresFiles); that's fine — we're testing the
       # handler path exists and doesn't raise on malformed/new input.
-      assert Process.alive?(lv.pid)
+      assert render(lv) =~ "propagation-map"
     end
 
     test "select_time event is accepted and doesn't crash the LV",
          %{conn: conn} do
       {:ok, lv, _html} = live(conn, ~p"/map")
       render_click(lv, "select_time", %{"time" => "2026-04-21T22:00:00Z"})
-      assert Process.alive?(lv.pid)
+      assert render(lv) =~ "propagation-map"
     end
 
     test "select_time with a malformed ISO string is a no-op (no crash)", %{conn: conn} do
       {:ok, lv, _html} = live(conn, ~p"/map")
       render_click(lv, "select_time", %{"time" => "definitely-not-a-time"})
-      assert Process.alive?(lv.pid)
+      assert render(lv) =~ "propagation-map"
     end
 
     test "set_selected_time with a malformed ISO string is a no-op (no crash)", %{conn: conn} do
       {:ok, lv, _html} = live(conn, ~p"/map")
       render_hook(lv, "set_selected_time", %{"time" => "definitely-not-a-time"})
-      assert Process.alive?(lv.pid)
+      assert render(lv) =~ "propagation-map"
     end
 
     test "select_time with valid iso updates selected_time assign", %{conn: conn} do
@@ -272,7 +272,6 @@ defmodule MicrowavepropWeb.MapLiveTest do
       # The assertion is that the handler returns cleanly even in the
       # "no HRRR profile" path (dev/test has empty .prop files).
       render_click(lv, "point_detail", %{"lat" => 32.9, "lon" => -97.04})
-      assert Process.alive?(lv.pid)
       assert render(lv) =~ "propagation-map"
     end
   end
diff --git a/test/microwaveprop_web/live/rover_live_test.exs b/test/microwaveprop_web/live/rover_live_test.exs
index 3d77abe9..f5ac2c1d 100644
--- a/test/microwaveprop_web/live/rover_live_test.exs
+++ b/test/microwaveprop_web/live/rover_live_test.exs
@@ -110,10 +110,8 @@ defmodule MicrowavepropWeb.RoverLiveTest do
       {:ok, view, _html} = live(conn, ~p"/rover")
 
       send(view.pid, {:rover_progress, "Scoring band 10G", 5, 18})
+      _ = :sys.get_state(view.pid)
 
-      Process.sleep(20)
-      # Just verify the LV is alive — render reflects scoring_step but
-      # we don't assert on the exact text.
       assert render(view) =~ "Rover planning"
     end
   end
diff --git a/test/microwaveprop_web/live/submit_live_test.exs b/test/microwaveprop_web/live/submit_live_test.exs
index 1aada6f4..27ac3d6c 100644
--- a/test/microwaveprop_web/live/submit_live_test.exs
+++ b/test/microwaveprop_web/live/submit_live_test.exs
@@ -52,7 +52,7 @@ defmodule MicrowavepropWeb.SubmitLiveTest do
       # and the process to stay alive.
       render_hook(lv, "switch_tab", %{"tab" => "definitely-not-a-tab-#{System.unique_integer()}"})
 
-      assert Process.alive?(lv.pid)
+      assert render(lv) =~ "Submit Contact"
     end
 
     test "honors a known tab name", %{conn: conn} do
diff --git a/test/microwaveprop_web/telemetry_test.exs b/test/microwaveprop_web/telemetry_test.exs
index 7036c49d..c6b51995 100644
--- a/test/microwaveprop_web/telemetry_test.exs
+++ b/test/microwaveprop_web/telemetry_test.exs
@@ -91,7 +91,7 @@ defmodule MicrowavepropWeb.TelemetryTest do
       sup_name = :"telemetry_under_test_#{System.unique_integer([:positive])}"
 
       {:ok, pid} = Supervisor.start_link(Telemetry, :ok, name: sup_name)
-      assert Process.alive?(pid)
+      assert Process.whereis(sup_name) == pid
 
       # Unlink before tearing down so the brutal-kill exit signal doesn't
       # propagate to the test process (which trap_exit defaults to off).