refactor(contacts): rename propagation_mechanism_status -> mechanism_status

Column name now matches the type key used everywhere else:
  :hrrr -> hrrr_status, :weather -> weather_status,
  :terrain -> terrain_status, :mechanism -> mechanism_status

Drops the @status_column_overrides remap in BackfillEnqueueWorker
(status_column/1 is now a straight :"#{type}_status" derivation) and
the long-form references in Contact, ContactWeatherEnqueueWorker,
and MechanismClassifyWorker. Migration is a metadata-only RENAME
COLUMN + RENAME INDEX — safe to land in prod (no table rewrite,
brief catalog lock only).

lib/microwaveprop/radio/contact.ex

@@ -52,7 +52,7 @@ defmodule Microwaveprop.Radio.Contact do
     field :propagation_mechanism, :string
     field :propagation_mechanism_confidence, Ecto.Enum, values: [:high, :medium, :low]
 
-    field :propagation_mechanism_status, Ecto.Enum,
+    field :mechanism_status, Ecto.Enum,
       values: [:pending, :queued, :processing, :complete, :failed, :unavailable],
       default: :pending
 

lib/microwaveprop/workers/backfill_enqueue_worker.ex

@@ -33,12 +33,6 @@ defmodule Microwaveprop.Workers.BackfillEnqueueWorker do
   # Skip these in any reconcile / ordering pass that reads a <type>_status field.
   @virtual_types [:narr]
 
-  # `radar` and `mechanism` use differently-named *_status columns than
-  # `<type>_status`, so we remap them when building queries and update_alls.
-  @status_column_overrides %{
-    mechanism: :propagation_mechanism_status
-  }
-
   # A :queued contact whose updated_at is older than this is one the cron has
   # already tried ~144 times over 3 days without the underlying worker landing
   # data. At that point the data is effectively unreachable (dead ASOS station,
@@ -118,7 +112,7 @@ defmodule Microwaveprop.Workers.BackfillEnqueueWorker do
     end
   end
 
-  defp status_column(type), do: Map.get(@status_column_overrides, type, :"#{type}_status")
+  defp status_column(type), do: :"#{type}_status"
 
   # Flip contacts that have been stuck in :queued for longer than
   # @stale_queued_cutoff_seconds to :unavailable. One Repo.update_all per type,

lib/microwaveprop/workers/contact_weather_enqueue_worker.ex

@@ -117,7 +117,7 @@ defmodule Microwaveprop.Workers.ContactWeatherEnqueueWorker do
     if :radar in types, do: Radio.set_enrichment_status!(ids, :radar_status, :unavailable)
 
     if :mechanism in types,
-      do: Radio.set_enrichment_status!(ids, :propagation_mechanism_status, :unavailable)
+      do: Radio.set_enrichment_status!(ids, :mechanism_status, :unavailable)
   end
 
   defp mark_pos1_statuses(contact, ids, types, jobs_by_type) do
@@ -131,7 +131,7 @@ defmodule Microwaveprop.Workers.ContactWeatherEnqueueWorker do
     if :radar in types, do: mark_radar_status!(contact, ids, jobs_by_type[:radar])
 
     if :mechanism in types,
-      do: mark_status!(ids, :propagation_mechanism_status, jobs_by_type[:mechanism])
+      do: mark_status!(ids, :mechanism_status, jobs_by_type[:mechanism])
   end
 
   # IEM n0q composite reflectivity archive only has meaningful CONUS

lib/microwaveprop/workers/mechanism_classify_worker.ex

@@ -13,8 +13,7 @@ defmodule Microwaveprop.Workers.MechanismClassifyWorker do
     * `active_meteor_shower` — looked up from the static shower calendar
 
   Results land on the contact as `propagation_mechanism` (string),
-  `propagation_mechanism_confidence` (enum), and
+  `propagation_mechanism_confidence` (enum), and `mechanism_status`.
-  `propagation_mechanism_status`.
 
   Unique on `contact_id` so the submit-time enqueue path and the
   backfill cron collapse to a single job per contact.
@@ -236,7 +235,7 @@ defmodule Microwaveprop.Workers.MechanismClassifyWorker do
   defp mark_status(%Contact{} = contact, status, mechanism, confidence) do
     contact
     |> Ecto.Changeset.change(%{
-      propagation_mechanism_status: status,
+      mechanism_status: status,
       propagation_mechanism: mechanism,
       propagation_mechanism_confidence: confidence
     })

priv/repo/migrations/20260421142436_rename_propagation_mechanism_status.exs

@@ -0,0 +1,21 @@
+defmodule Microwaveprop.Repo.Migrations.RenamePropagationMechanismStatus do
+  use Ecto.Migration
+
+  def up do
+    execute """
+    ALTER INDEX contacts_propagation_mechanism_status_pending_index
+      RENAME TO contacts_mechanism_status_pending_index
+    """
+
+    rename table(:contacts), :propagation_mechanism_status, to: :mechanism_status
+  end
+
+  def down do
+    rename table(:contacts), :mechanism_status, to: :propagation_mechanism_status
+
+    execute """
+    ALTER INDEX contacts_mechanism_status_pending_index
+      RENAME TO contacts_propagation_mechanism_status_pending_index
+    """
+  end
+end

test/microwaveprop/workers/contact_weather_enqueue_worker_test.exs

@@ -736,7 +736,7 @@ defmodule Microwaveprop.Workers.ContactWeatherEnqueueWorkerTest do
       # BackfillEnqueueWorker from re-scanning these contacts every cron.
       assert updated.terrain_status == :unavailable
       assert updated.radar_status == :unavailable
-      assert updated.propagation_mechanism_status == :unavailable
+      assert updated.mechanism_status == :unavailable
     end
 
     # Pre-2014 contacts have no HRRR data ever; mark hrrr_status :unavailable

test/microwaveprop/workers/mechanism_classify_worker_test.exs

@@ -64,7 +64,7 @@ defmodule Microwaveprop.Workers.MechanismClassifyWorkerTest do
 
       reloaded = Repo.get!(Contact, contact.id)
       assert reloaded.propagation_mechanism == "rain_scatter"
-      assert reloaded.propagation_mechanism_status == :complete
+      assert reloaded.mechanism_status == :complete
       assert reloaded.propagation_mechanism_confidence == :high
     end
 
@@ -78,7 +78,7 @@ defmodule Microwaveprop.Workers.MechanismClassifyWorkerTest do
 
       reloaded = Repo.get!(Contact, contact.id)
       assert reloaded.propagation_mechanism == "troposcatter"
-      assert reloaded.propagation_mechanism_status == :complete
+      assert reloaded.mechanism_status == :complete
       assert reloaded.propagation_mechanism_confidence == :low
     end
 
@@ -126,7 +126,7 @@ defmodule Microwaveprop.Workers.MechanismClassifyWorkerTest do
                })
 
       reloaded = Repo.get!(Contact, contact.id)
-      assert reloaded.propagation_mechanism_status == :unavailable
+      assert reloaded.mechanism_status == :unavailable
     end
 
     test "missing contact (deleted) returns :ok gracefully" do