Fix job_id mismatch between ingestion enqueue and status endpoints

POST /api/v1/admin/ingest/movie returned arq's own internal queue
job id, but GET /api/v1/admin/ingest/jobs/{job_id} looked up our
IngestionJob DB row by its own UUID -- a completely different id that
didn't even exist yet at enqueue time (the row was only created once
the worker picked up the task). Every status poll 404'd.

Fix: create the IngestionJob row synchronously in the enqueue endpoint
(reusing the existing idempotency-key logic, so repeat enqueues for
the same tmdb_id reuse the same row rather than creating duplicates),
pass its real id into the arq task, and have the worker update that
row instead of creating a new one.

Found by actually running the milestone end-to-end: enqueue a real
TMDb ingestion, then poll its status.

Co-Authored-By: Claude Sonnet 5 <[email protected]>

app/workers/tasks.py

@@ -1,9 +1,15 @@
 """arq task functions. Thin wrappers around the ingestion runner so retry/
 concurrency/observability behavior lives in arq's worker loop, not here.
+
+Each task receives the `IngestionJob` row's id (created synchronously by the
+enqueuing endpoint via `get_or_create_ingestion_job`, *not* generated here)
+so status polling has a real, immediately-valid id to look up from the
+moment the HTTP response comes back.
 """
 
 from __future__ import annotations
 
+import uuid
 from typing import Any
 
 from app.core.logging import get_logger
@@ -12,11 +18,11 @@ from app.services.ingestion.runner import run_movie_ingestion, run_person_ingest
 logger = get_logger(__name__)
 
 
-async def ingest_movie_task(ctx: dict[str, Any], external_id: str) -> str:
-    movie_id = await run_movie_ingestion(external_id)
+async def ingest_movie_task(ctx: dict[str, Any], job_id: str, external_id: str) -> str:
+    movie_id = await run_movie_ingestion(uuid.UUID(job_id), external_id)
     return str(movie_id)
 
 
-async def ingest_person_task(ctx: dict[str, Any], external_id: str) -> str:
-    person_id = await run_person_ingestion(external_id)
+async def ingest_person_task(ctx: dict[str, Any], job_id: str, external_id: str) -> str:
+    person_id = await run_person_ingestion(uuid.UUID(job_id), external_id)
     return str(person_id)