From 1400c38f44ef252a4cc17dfc65e41bc5e42cd938 Mon Sep 17 00:00:00 2001
From: Graham McIntire <graham@mcintire.me>
Date: Tue, 21 Apr 2026 12:58:04 -0500
Subject: [PATCH] fix(dialyzer): actually fix LiveTable warnings instead of
 hiding them
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Rework of d61fbd3's dialyzer suppression: the 4 warnings from
LiveTable.LiveResource's macro expansion are now fixed at the
root rather than hidden via .dialyzer_ignore.exs.

Changes:

- Delete .dialyzer_ignore.exs and remove ignore_warnings from
  mix.exs. No more hidden suppressions.

- New MicrowavepropWeb.LiveTableResource shim that wraps
  use LiveTable.LiveResource and overrides:
  * maybe_subscribe/1 — explicit :ok = on Phoenix.PubSub.subscribe/2
    (previously discarded, tripping :unmatched_return).
  * handle_info/2 — explicit _ = on File.rm, Process.send_after.
  Switch all 4 LiveTable-using LiveViews (contact_live/index,
  beacon_live/index, admin/contact_edit_live, user_management_live/index)
  to use MicrowavepropWeb.LiveTableResource instead.

- New priv/dep_patches/live_table-0.4.1.patch adds _ = in front of
  LiveTable.LiveSelectHelpers.restore_live_select_from_params/2 in
  the dep's macro-expanded handle_params/3. The call's return was
  silently discarded, tripping the fourth warning per LiveView.

- New lib/mix/tasks/deps.patch.ex applies every
  priv/dep_patches/*.patch to its target dep idempotently after
  mix deps.get. Wired into the :setup alias + overridden
  mix deps.get so the patch survives cache regeneration in CI.

- Other modified files in this commit are the spec-coverage
  additions from the parallel agent pass (beacons.ex,
  commercial.ex, propagation.ex, weather.ex, narr_client.ex,
  run_timing.ex, 3 workers) — tighter specs for bounds, tuple
  shapes, schema-typed params. Dialyzer remains at 0 after
  the changes.

Upstream TODO: send a PR for the live_table `_ =` fix. Once
merged and released, drop the patch + mix task + bump the dep.

mix dialyzer --format short | grep ^lib/ | wc -l -> 0
mix test: 2165 tests, 2 pre-existing flakes (MapLive timestamp +
PropagationPrune ScoresFile), 0 regressions.
---
 .dialyzer_ignore.exs                          | 10 ---
 lib/microwaveprop/beacons.ex                  |  2 +-
 lib/microwaveprop/commercial.ex               |  6 +-
 lib/microwaveprop/propagation.ex              |  6 +-
 lib/microwaveprop/propagation/run_timing.ex   |  1 +
 lib/microwaveprop/weather.ex                  | 13 +--
 lib/microwaveprop/weather/narr_client.ex      |  1 +
 .../workers/contact_weather_enqueue_worker.ex | 10 ++-
 .../workers/hrrr_native_grid_worker.ex        |  1 +
 lib/microwaveprop/workers/nexrad_worker.ex    |  1 +
 .../live/admin/contact_edit_live.ex           |  2 +-
 .../live/beacon_live/index.ex                 |  2 +-
 .../live/contact_live/index.ex                |  2 +-
 .../live/user_management_live/index.ex        |  2 +-
 lib/microwaveprop_web/live_table_resource.ex  | 84 +++++++++++++++++++
 lib/mix/tasks/deps.patch.ex                   | 77 +++++++++++++++++
 mix.exs                                       |  6 +-
 priv/dep_patches/live_table-0.4.1.patch       | 18 ++++
 18 files changed, 216 insertions(+), 28 deletions(-)
 delete mode 100644 .dialyzer_ignore.exs
 create mode 100644 lib/microwaveprop_web/live_table_resource.ex
 create mode 100644 lib/mix/tasks/deps.patch.ex
 create mode 100644 priv/dep_patches/live_table-0.4.1.patch

diff --git a/.dialyzer_ignore.exs b/.dialyzer_ignore.exs
deleted file mode 100644
index ce5b7351..00000000
--- a/.dialyzer_ignore.exs
+++ /dev/null
@@ -1,10 +0,0 @@
-# LiveTable.LiveResource macro expansion (in the dep) emits
-# unmatched_return for Phoenix.PubSub.subscribe/Oban.insert calls
-# it generates inside handle_event/3 and maybe_subscribe/1. Can't
-# fix without forking the dep; suppress at the `use` line only.
-[
-  {"lib/microwaveprop_web/live/admin/contact_edit_live.ex", :unmatched_return, 4},
-  {"lib/microwaveprop_web/live/beacon_live/index.ex", :unmatched_return, 4},
-  {"lib/microwaveprop_web/live/contact_live/index.ex", :unmatched_return, 4},
-  {"lib/microwaveprop_web/live/user_management_live/index.ex", :unmatched_return, 4}
-]
diff --git a/lib/microwaveprop/beacons.ex b/lib/microwaveprop/beacons.ex
index d9770216..48c7fdf1 100644
--- a/lib/microwaveprop/beacons.ex
+++ b/lib/microwaveprop/beacons.ex
@@ -72,7 +72,7 @@ defmodule Microwaveprop.Beacons do
   end
 
   @doc "Gets a single beacon. Raises if not found."
-  @spec get_beacon!(Ecto.UUID.t()) :: Beacon.t() | nil | [map()]
+  @spec get_beacon!(Ecto.UUID.t()) :: Beacon.t() | [Beacon.t()] | nil
   def get_beacon!(id), do: Beacon |> Repo.get!(id) |> Repo.preload(:user)
 
   @doc """
diff --git a/lib/microwaveprop/commercial.ex b/lib/microwaveprop/commercial.ex
index 1d4e6000..d0b4e6b9 100644
--- a/lib/microwaveprop/commercial.ex
+++ b/lib/microwaveprop/commercial.ex
@@ -82,7 +82,11 @@ defmodule Microwaveprop.Commercial do
   aggregate degradation map or `nil` when no in-range link is
   reporting usable data.
   """
-  @spec link_degradation_from_lookup({float(), float()}, [tuple()], keyword()) :: map() | nil
+  @spec link_degradation_from_lookup(
+          {float(), float()},
+          [{Link.t(), {float(), float()}, map() | nil}],
+          keyword()
+        ) :: map() | nil
   def link_degradation_from_lookup({lat, lon}, lookup, opts \\ []) do
     radius_km = Keyword.get(opts, :radius_km, @default_radius_km)
 
diff --git a/lib/microwaveprop/propagation.ex b/lib/microwaveprop/propagation.ex
index b0683c38..758ec4b0 100644
--- a/lib/microwaveprop/propagation.ex
+++ b/lib/microwaveprop/propagation.ex
@@ -274,7 +274,7 @@ defmodule Microwaveprop.Propagation do
   If valid_time is nil, uses the earliest available (current analysis hour).
   Excludes factors for performance.
   """
-  @spec scores_at(non_neg_integer(), DateTime.t() | nil, map() | nil) ::
+  @spec scores_at(non_neg_integer(), DateTime.t() | nil, %{optional(String.t()) => float()} | nil) ::
           [%{lat: float(), lon: float(), score: non_neg_integer(), valid_time: DateTime.t()}]
   def scores_at(band_mhz, valid_time, bounds \\ nil) do
     time = valid_time || earliest_valid_time(band_mhz)
@@ -315,7 +315,7 @@ defmodule Microwaveprop.Propagation do
   scores because of the race between `propagation:cache` fan-out and
   `propagation:updated` delivery.
   """
-  @spec scores_at_fresh(non_neg_integer(), DateTime.t(), map() | nil) ::
+  @spec scores_at_fresh(non_neg_integer(), DateTime.t(), %{optional(String.t()) => float()} | nil) ::
           [%{lat: float(), lon: float(), score: non_neg_integer(), valid_time: DateTime.t()}]
   def scores_at_fresh(band_mhz, %DateTime{} = valid_time, bounds \\ nil) do
     read_from_disk_and_cache(band_mhz, valid_time, bounds)
@@ -364,7 +364,7 @@ defmodule Microwaveprop.Propagation do
   end
 
   @doc "Get the latest scores for a band (alias for scores_at with earliest valid_time)."
-  @spec latest_scores(non_neg_integer(), map() | nil) ::
+  @spec latest_scores(non_neg_integer(), %{optional(String.t()) => float()} | nil) ::
           [%{lat: float(), lon: float(), score: non_neg_integer(), valid_time: DateTime.t()}]
   def latest_scores(band_mhz, bounds \\ nil) do
     scores_at(band_mhz, nil, bounds)
diff --git a/lib/microwaveprop/propagation/run_timing.ex b/lib/microwaveprop/propagation/run_timing.ex
index 1535f668..b57c6b61 100644
--- a/lib/microwaveprop/propagation/run_timing.ex
+++ b/lib/microwaveprop/propagation/run_timing.ex
@@ -30,6 +30,7 @@ defmodule Microwaveprop.Propagation.RunTiming do
   @required ~w(run_time forecast_hour valid_time started_at finished_at duration_ms status)a
   @optional ~w(error)a
 
+  @spec changeset(t() | Ecto.Changeset.t(), map()) :: Ecto.Changeset.t()
   def changeset(row, attrs) do
     row
     |> cast(attrs, @required ++ @optional)
diff --git a/lib/microwaveprop/weather.ex b/lib/microwaveprop/weather.ex
index b0bebf17..189f7770 100644
--- a/lib/microwaveprop/weather.ex
+++ b/lib/microwaveprop/weather.ex
@@ -421,7 +421,7 @@ defmodule Microwaveprop.Weather do
   Callers that genuinely need synchronous data (tests, scripts) should use
   `load_weather_grid/1` instead.
   """
-  @spec latest_weather_grid(map()) :: [map()]
+  @spec latest_weather_grid(%{optional(String.t()) => float()} | nil) :: [map()]
   def latest_weather_grid(bounds) do
     case latest_grid_valid_time() do
       nil ->
@@ -445,7 +445,7 @@ defmodule Microwaveprop.Weather do
   Used by tests and by `weather_point_detail/3` fallbacks. LiveView
   callers should prefer `latest_weather_grid/1`.
   """
-  @spec load_weather_grid(map()) :: [map()]
+  @spec load_weather_grid(%{optional(String.t()) => float()} | nil) :: [map()]
   def load_weather_grid(bounds) do
     case latest_grid_valid_time() do
       nil ->
@@ -486,7 +486,7 @@ defmodule Microwaveprop.Weather do
   per pod. The ProfilesFile read is a single ~2 MB ETF decode per scrub,
   which is fast enough for a user click.
   """
-  @spec weather_grid_at(DateTime.t(), map()) :: [map()]
+  @spec weather_grid_at(DateTime.t(), %{optional(String.t()) => float()} | nil) :: [map()]
   def weather_grid_at(%DateTime{} = valid_time, bounds) do
     case GridCache.fetch_bounds(valid_time, bounds) do
       {:ok, rows} ->
@@ -605,8 +605,11 @@ defmodule Microwaveprop.Weather do
   `ProfilesFile.read/1`. Each row is pushed through `derive_and_clean/1`
   to compute the derived fields consumed by the weather map LiveView.
   """
-  @spec build_grid_cache_rows(%{{float(), float()} => map()}, DateTime.t(), map() | nil) ::
-          [map()]
+  @spec build_grid_cache_rows(
+          %{{float(), float()} => map()},
+          DateTime.t(),
+          %{optional(String.t()) => float()} | nil
+        ) :: [map()]
   def build_grid_cache_rows(grid_data, valid_time, bounds \\ nil) do
     grid_data
     |> filter_grid_data_bounds(bounds)
diff --git a/lib/microwaveprop/weather/narr_client.ex b/lib/microwaveprop/weather/narr_client.ex
index a29e2462..b389f078 100644
--- a/lib/microwaveprop/weather/narr_client.ex
+++ b/lib/microwaveprop/weather/narr_client.ex
@@ -321,6 +321,7 @@ defmodule Microwaveprop.Weather.NarrClient do
   end
 
   @doc false
+  @spec parse_cdo_outputtab(String.t()) :: {:ok, map()} | {:error, String.t()}
   def parse_cdo_outputtab(stdout) do
     raw =
       stdout
diff --git a/lib/microwaveprop/workers/contact_weather_enqueue_worker.ex b/lib/microwaveprop/workers/contact_weather_enqueue_worker.ex
index 5ecda2cd..03069063 100644
--- a/lib/microwaveprop/workers/contact_weather_enqueue_worker.ex
+++ b/lib/microwaveprop/workers/contact_weather_enqueue_worker.ex
@@ -3,6 +3,7 @@ defmodule Microwaveprop.Workers.ContactWeatherEnqueueWorker do
   use Oban.Worker, queue: :enqueue, max_attempts: 3
 
   alias Microwaveprop.Radio
+  alias Microwaveprop.Radio.Contact
   alias Microwaveprop.Weather
   alias Microwaveprop.Weather.HrrrPointEnqueuer
   alias Microwaveprop.Weather.NarrClient
@@ -24,6 +25,7 @@ defmodule Microwaveprop.Workers.ContactWeatherEnqueueWorker do
   Called directly from submission flow — no Oban indirection.
   Optionally pass a list of types to limit which enrichments run.
   """
+  @spec enqueue_for_contact(Contact.t(), [atom()]) :: :ok
   def enqueue_for_contact(contact, types \\ [:hrrr, :weather, :terrain, :iemre, :radar, :mechanism]) do
     contact = Radio.ensure_positions!(contact)
     jobs_by_type = build_jobs_by_type(contact, types)
@@ -233,6 +235,7 @@ defmodule Microwaveprop.Workers.ContactWeatherEnqueueWorker do
     end
   end
 
+  @spec build_terrain_jobs([Contact.t()]) :: [Ecto.Changeset.t()]
   def build_terrain_jobs(contacts) do
     contacts
     |> Enum.filter(fn contact -> contact.pos1 && contact.pos2 end)
@@ -242,6 +245,7 @@ defmodule Microwaveprop.Workers.ContactWeatherEnqueueWorker do
     |> Enum.uniq_by(fn changeset -> changeset.changes.args end)
   end
 
+  @spec build_radar_jobs([Contact.t()]) :: [Ecto.Changeset.t()]
   def build_radar_jobs(contacts) do
     # Group contacts by their 5-min NEXRAD frame so the worker can
     # fetch+decode the ~5 MB PNG once per frame and iterate every
@@ -265,6 +269,7 @@ defmodule Microwaveprop.Workers.ContactWeatherEnqueueWorker do
     end)
   end
 
+  @spec build_mechanism_jobs([Contact.t()]) :: [Ecto.Changeset.t()]
   def build_mechanism_jobs(contacts) do
     contacts
     |> Enum.filter(fn contact -> contact.pos1 && contact.pos2 end)
@@ -274,18 +279,21 @@ defmodule Microwaveprop.Workers.ContactWeatherEnqueueWorker do
     |> Enum.uniq_by(fn changeset -> changeset.changes.args end)
   end
 
+  @spec build_weather_jobs([Contact.t()]) :: [Ecto.Changeset.t()]
   def build_weather_jobs(contacts) do
     contacts
     |> Enum.flat_map(&jobs_for_contact/1)
     |> Enum.uniq_by(fn changeset -> changeset.changes.args end)
   end
 
+  @spec build_iemre_jobs([Contact.t()]) :: [Ecto.Changeset.t()]
   def build_iemre_jobs(contacts) do
     contacts
     |> Enum.flat_map(&iemre_job_for_contact/1)
     |> Enum.uniq_by(fn changeset -> changeset.changes.args end)
   end
 
+  @spec build_narr_jobs([Contact.t()]) :: [Ecto.Changeset.t()]
   def build_narr_jobs(contacts) do
     contacts
     |> Enum.flat_map(&narr_jobs_for_contact/1)
@@ -440,7 +448,7 @@ defmodule Microwaveprop.Workers.ContactWeatherEnqueueWorker do
   Returns `{:ok, %{radius_km, jobs_enqueued}}`, or `{:error, :no_stations}`
   when even 1000 km finds nothing.
   """
-  @spec enqueue_raob_fetch_with_widening(Microwaveprop.Radio.Contact.t()) ::
+  @spec enqueue_raob_fetch_with_widening(Contact.t()) ::
           {:ok, %{radius_km: pos_integer(), jobs_enqueued: non_neg_integer()}}
           | {:error, :no_stations}
           | {:error, :no_coords}
diff --git a/lib/microwaveprop/workers/hrrr_native_grid_worker.ex b/lib/microwaveprop/workers/hrrr_native_grid_worker.ex
index 6c42ae84..b57afc0b 100644
--- a/lib/microwaveprop/workers/hrrr_native_grid_worker.ex
+++ b/lib/microwaveprop/workers/hrrr_native_grid_worker.ex
@@ -57,6 +57,7 @@ defmodule Microwaveprop.Workers.HrrrNativeGridWorker do
   end
 
   @doc false
+  @spec points_of_interest_for_hour(DateTime.t()) :: [{float(), float()}]
   def points_of_interest_for_hour(valid_time) do
     time_start = DateTime.add(valid_time, -1800, :second)
     time_end = DateTime.add(valid_time, 1800, :second)
diff --git a/lib/microwaveprop/workers/nexrad_worker.ex b/lib/microwaveprop/workers/nexrad_worker.ex
index d569195c..63eed505 100644
--- a/lib/microwaveprop/workers/nexrad_worker.ex
+++ b/lib/microwaveprop/workers/nexrad_worker.ex
@@ -44,6 +44,7 @@ defmodule Microwaveprop.Workers.NexradWorker do
   end
 
   @doc false
+  @spec points_of_interest_for_time(DateTime.t()) :: [{float(), float()}]
   def points_of_interest_for_time(timestamp) do
     # Match contacts within +/- 30 minutes of this frame
     time_start = DateTime.add(timestamp, -1800, :second)
diff --git a/lib/microwaveprop_web/live/admin/contact_edit_live.ex b/lib/microwaveprop_web/live/admin/contact_edit_live.ex
index d1da438d..4ca67d5c 100644
--- a/lib/microwaveprop_web/live/admin/contact_edit_live.ex
+++ b/lib/microwaveprop_web/live/admin/contact_edit_live.ex
@@ -1,7 +1,7 @@
 defmodule MicrowavepropWeb.Admin.ContactEditLive do
   @moduledoc false
   use MicrowavepropWeb, :live_view
-  use LiveTable.LiveResource, schema: Microwaveprop.Radio.ContactEdit
+  use MicrowavepropWeb.LiveTableResource, schema: Microwaveprop.Radio.ContactEdit
 
   alias Microwaveprop.Radio
   alias Microwaveprop.Radio.EditNotifier
diff --git a/lib/microwaveprop_web/live/beacon_live/index.ex b/lib/microwaveprop_web/live/beacon_live/index.ex
index 6154dd33..20d2609a 100644
--- a/lib/microwaveprop_web/live/beacon_live/index.ex
+++ b/lib/microwaveprop_web/live/beacon_live/index.ex
@@ -1,7 +1,7 @@
 defmodule MicrowavepropWeb.BeaconLive.Index do
   @moduledoc false
   use MicrowavepropWeb, :live_view
-  use LiveTable.LiveResource, schema: Microwaveprop.Beacons.Beacon
+  use MicrowavepropWeb.LiveTableResource, schema: Microwaveprop.Beacons.Beacon
 
   alias Microwaveprop.Beacons
   alias Microwaveprop.Beacons.Beacon
diff --git a/lib/microwaveprop_web/live/contact_live/index.ex b/lib/microwaveprop_web/live/contact_live/index.ex
index 26ee4ac2..ccbc4b01 100644
--- a/lib/microwaveprop_web/live/contact_live/index.ex
+++ b/lib/microwaveprop_web/live/contact_live/index.ex
@@ -1,7 +1,7 @@
 defmodule MicrowavepropWeb.ContactLive.Index do
   @moduledoc false
   use MicrowavepropWeb, :live_view
-  use LiveTable.LiveResource, schema: Microwaveprop.Radio.Contact
+  use MicrowavepropWeb.LiveTableResource, schema: Microwaveprop.Radio.Contact
 
   import Ecto.Query
 
diff --git a/lib/microwaveprop_web/live/user_management_live/index.ex b/lib/microwaveprop_web/live/user_management_live/index.ex
index 0f7e5c02..12c2e2b3 100644
--- a/lib/microwaveprop_web/live/user_management_live/index.ex
+++ b/lib/microwaveprop_web/live/user_management_live/index.ex
@@ -1,7 +1,7 @@
 defmodule MicrowavepropWeb.UserManagementLive.Index do
   @moduledoc false
   use MicrowavepropWeb, :live_view
-  use LiveTable.LiveResource, schema: Microwaveprop.Accounts.User
+  use MicrowavepropWeb.LiveTableResource, schema: Microwaveprop.Accounts.User
 
   alias Microwaveprop.Accounts
 
diff --git a/lib/microwaveprop_web/live_table_resource.ex b/lib/microwaveprop_web/live_table_resource.ex
new file mode 100644
index 00000000..f537615b
--- /dev/null
+++ b/lib/microwaveprop_web/live_table_resource.ex
@@ -0,0 +1,84 @@
+defmodule MicrowavepropWeb.LiveTableResource do
+  @moduledoc """
+  Thin wrapper around `LiveTable.LiveResource` that replaces the two
+  helper functions (`maybe_subscribe/1` and `handle_info/2`) whose
+  macro-expanded bodies discard return values from `Phoenix.PubSub.subscribe/2`,
+  `File.mkdir_p!/1`, `File.cp!/2`, `File.rm/1`, and `Process.send_after/3` —
+  which trips the strict dialyzer flag `:unmatched_return` at the `use`
+  site of every LiveView that uses the dep.
+
+  The replacements are semantically identical; each just pattern-matches
+  or explicitly `_ =`-binds the discarded return so dialyzer is happy.
+  No functional change.
+
+  The dep's `handle_info/2` only has two clauses (`:file_ready` and
+  `:cleanup_file`) — both defined in
+  `deps/live_table/lib/live_table/helpers/export_helpers.ex`. Overriding
+  replaces the full set, but since the dep doesn't define any other
+  handle_info clauses (sort/range_change/etc. are all `handle_event/3`,
+  a different function), LiveView modules using this wrapper can add
+  their own `handle_info/2` clauses normally — they append as extra
+  clauses after this override.
+
+  Upstream fix opportunity: submit a PR to
+  https://github.com/gurujada/live_table adding the same `_ =`
+  prefixes so this wrapper can be removed.
+  """
+
+  defmacro __using__(opts) do
+    quote location: :keep do
+      use LiveTable.LiveResource, unquote(opts)
+
+      defoverridable maybe_subscribe: 1, handle_info: 2
+
+      defp maybe_subscribe(socket) do
+        case socket.assigns[:export_topic] do
+          nil ->
+            client_id = Ecto.UUID.generate()
+            export_topic = "exports:#{client_id}"
+            updated_socket = assign(socket, export_topic: export_topic)
+
+            if connected?(socket) do
+              :ok =
+                Phoenix.PubSub.subscribe(
+                  Application.fetch_env!(:live_table, :pubsub),
+                  export_topic
+                )
+            end
+
+            {export_topic, updated_socket}
+
+          export_topic ->
+            {export_topic, socket}
+        end
+      end
+
+      @impl true
+      def handle_info({:file_ready, file_path}, socket) do
+        app_name = Application.fetch_env!(:live_table, :app)
+        static_path = Path.join([:code.priv_dir(app_name), "static", "exports"])
+        File.mkdir_p!(static_path)
+
+        filename = Path.basename(file_path)
+        dest_path = Path.join(static_path, filename)
+        File.cp!(file_path, dest_path)
+
+        updated_socket =
+          socket
+          |> push_event("download", %{path: "/exports/#{filename}"})
+          |> put_flash(:info, "File downloaded successfully.")
+
+        _timer_ref =
+          Process.send_after(self(), {:cleanup_file, dest_path}, to_timeout(second: 20))
+
+        _rm_result = File.rm(file_path)
+        {:noreply, updated_socket}
+      end
+
+      def handle_info({:cleanup_file, file_path}, socket) do
+        _rm_result = File.rm(file_path)
+        {:noreply, socket}
+      end
+    end
+  end
+end
diff --git a/lib/mix/tasks/deps.patch.ex b/lib/mix/tasks/deps.patch.ex
new file mode 100644
index 00000000..7536a69d
--- /dev/null
+++ b/lib/mix/tasks/deps.patch.ex
@@ -0,0 +1,77 @@
+defmodule Mix.Tasks.Deps.Patch do
+  @shortdoc "Applies local patches to fetched hex dependencies"
+
+  @moduledoc """
+  Applies every patch file in `priv/dep_patches/*.patch` to its
+  corresponding dependency under `deps/`. Each patch name follows the
+  convention `<dep_name>-<version>.patch` (e.g. `live_table-0.4.1.patch`).
+
+  Applied idempotently — if the patched text is already present we skip
+  the dep. Run after `mix deps.get` / `mix deps.compile`. Safe to invoke
+  repeatedly.
+
+  Why this exists: `live_table` 0.4.1 has a call to
+  `LiveTable.LiveSelectHelpers.restore_live_select_from_params/2` whose
+  return value is discarded inside the macro-expanded `handle_params/3`,
+  tripping the strict dialyzer `:unmatched_return` flag at every `use`
+  site. The patch adds an `_ =` binding. Upstream PR TODO — once merged
+  and released, drop both the patch and this task.
+  """
+  use Mix.Task
+
+  @patches_dir "priv/dep_patches"
+
+  @impl Mix.Task
+  def run(_args) do
+    case File.ls(@patches_dir) do
+      {:ok, entries} ->
+        patches = entries |> Enum.filter(&String.ends_with?(&1, ".patch")) |> Enum.sort()
+
+        Enum.each(patches, &apply_patch/1)
+
+      {:error, :enoent} ->
+        Mix.shell().info("deps.patch: no #{@patches_dir} directory — nothing to do")
+    end
+  end
+
+  defp apply_patch(filename) do
+    dep_name =
+      filename
+      |> Path.basename(".patch")
+      |> String.split("-")
+      |> Enum.drop(-1)
+      |> Enum.join("-")
+
+    dep_dir = Path.join("deps", dep_name)
+
+    cond do
+      not File.dir?(dep_dir) ->
+        Mix.shell().info("deps.patch: skipping #{filename} — deps/#{dep_name} not present")
+
+      patch_already_applied?(filename, dep_dir) ->
+        Mix.shell().info("deps.patch: #{filename} already applied")
+
+      true ->
+        patch_path = Path.join(@patches_dir, filename)
+        {output, exit_code} = System.cmd("patch", ["-p1", "-i", Path.absname(patch_path)], cd: dep_dir)
+
+        if exit_code == 0 do
+          Mix.shell().info("deps.patch: applied #{filename}")
+          touch_sentinel(filename, dep_dir)
+        else
+          Mix.raise("deps.patch: failed to apply #{filename}:\n#{output}")
+        end
+    end
+  end
+
+  # Record that the patch landed by writing a sentinel file inside the
+  # dep dir. `File.touch!/1` avoids spurious re-applications when the
+  # patch contains text the dep happens to contain already.
+  defp touch_sentinel(filename, dep_dir) do
+    File.touch!(Path.join(dep_dir, ".#{filename}.applied"))
+  end
+
+  defp patch_already_applied?(filename, dep_dir) do
+    File.exists?(Path.join(dep_dir, ".#{filename}.applied"))
+  end
+end
diff --git a/mix.exs b/mix.exs
index 40f8848b..7ac99d59 100644
--- a/mix.exs
+++ b/mix.exs
@@ -21,8 +21,7 @@ defmodule Microwaveprop.MixProject do
           :unmatched_returns,
           :extra_return,
           :missing_return
-        ],
-        ignore_warnings: ".dialyzer_ignore.exs"
+        ]
       ]
     ]
   end
@@ -124,7 +123,8 @@ defmodule Microwaveprop.MixProject do
   # See the documentation for `Mix` for more info on aliases.
   defp aliases do
     [
-      setup: ["deps.get", "ecto.setup", "assets.setup", "assets.build"],
+      setup: ["deps.get", "deps.patch", "ecto.setup", "assets.setup", "assets.build"],
+      "deps.get": ["deps.get", "deps.patch"],
       "ecto.setup": ["ecto.create", "ecto.migrate", "run priv/repo/seeds.exs"],
       "ecto.reset": ["ecto.drop", "ecto.setup"],
       test: ["ecto.create --quiet", "ecto.migrate --quiet", "test"],
diff --git a/priv/dep_patches/live_table-0.4.1.patch b/priv/dep_patches/live_table-0.4.1.patch
new file mode 100644
index 00000000..2a405407
--- /dev/null
+++ b/priv/dep_patches/live_table-0.4.1.patch
@@ -0,0 +1,18 @@
+--- a/lib/live_table/helpers/liveview_helpers.ex
++++ b/lib/live_table/helpers/liveview_helpers.ex
+@@ -35,10 +35,11 @@
+           |> assign(:live_select_restored, updated_restored)
+           |> maybe_assign_infinite_scroll(table_options)
+
+-        LiveTable.LiveSelectHelpers.restore_live_select_from_params(
+-          live_select_updates,
+-          current_filters
+-        )
++        _ =
++          LiveTable.LiveSelectHelpers.restore_live_select_from_params(
++            live_select_updates,
++            current_filters
++          )
+
+         {:noreply, socket}
+       end