Add periodic enrichment backfill cron and terrain reconciliation

Runs BackfillEnqueueWorker every 30 minutes to pick up contacts with
pending/queued/failed enrichment status and enqueue missing jobs.
Before enqueueing, reconciles terrain contacts stuck in "queued" by
checking the terrain_profiles FK directly.

config/runtime.exs

@@ -129,7 +129,7 @@ if config_env() == :prod do
     ],
     secret_key_base: secret_key_base
 
-  # Production Oban: live scoring, polling, and on-demand QSO enrichment (no cron backfill)
+  # Production Oban: live scoring, polling, and on-demand QSO enrichment
   config :microwaveprop, Oban,
     # Per-pod concurrency (×3 pods = effective cluster total)
     queues: [propagation: 1, commercial: 1, solar: 1, weather: 3, hrrr: 5, terrain: 3, iemre: 3, backfill_enqueue: 1],
@@ -140,7 +140,9 @@ if config_env() == :prod do
        crontab: [
          {"0 8 * * *", Microwaveprop.Workers.SolarIndexWorker},
          {"*/5 * * * *", Microwaveprop.Commercial.PollWorker},
-         {"5 * * * *", Microwaveprop.Workers.PropagationGridWorker}
+         {"5 * * * *", Microwaveprop.Workers.PropagationGridWorker},
+         {"*/30 * * * *", Microwaveprop.Workers.BackfillEnqueueWorker,
+          args: %{"limit" => 500, "types" => ["hrrr", "weather", "terrain", "iemre"]}}
        ]}
     ]
 

lib/microwaveprop/workers/backfill_enqueue_worker.ex

@@ -20,6 +20,12 @@ defmodule Microwaveprop.Workers.BackfillEnqueueWorker do
   def perform(%Oban.Job{args: %{"limit" => limit} = args}) do
     types = parse_types(args)
 
+    reconciled = reconcile_stale_queued(types)
+
+    if reconciled > 0 do
+      Logger.info("BackfillEnqueue: reconciled #{reconciled} stale queued contacts")
+    end
+
     contacts =
       Contact
       |> where([c], not is_nil(c.pos1) or not is_nil(c.grid1))
@@ -58,6 +64,28 @@ defmodule Microwaveprop.Workers.BackfillEnqueueWorker do
     ]
   end
 
+  # Fast SQL reconciliation for contacts stuck in "queued" where data already exists.
+  # Terrain profiles have a direct contact_id FK so we can reconcile in bulk.
+  defp reconcile_stale_queued(types) do
+    terrain_count =
+      if :terrain in types do
+        {count, _} =
+          Repo.update_all(
+            from(c in Contact,
+              where: c.terrain_status == :queued,
+              where: c.id in subquery(from(tp in "terrain_profiles", select: tp.contact_id))
+            ),
+            set: [terrain_status: :complete]
+          )
+
+        count
+      else
+        0
+      end
+
+    terrain_count
+  end
+
   defp type_filter(types) do
     Enum.reduce(types, dynamic(false), fn type, acc ->
       field = :"#{type}_status"