feat: mcp and backfill fixes

backend/src/api/routers/backfill.py

@@ -24,6 +24,12 @@ class FetchMediaRequest(BaseModel):
     message_id: int
 
 
+class TranscribeRequest(BaseModel):
+    account_id: int
+    chat_id: int
+    message_id: int
+
+
 class SyncDialogsRequest(BaseModel):
     account_id: int
 
@@ -82,6 +88,19 @@ async def enqueue_fetch_media(
     return EnqueueResponse(job_id=job_id)
 
 
+@router.post("/media/transcribe", status_code=201)
+async def enqueue_transcribe(
+    pool: FromDishka[asyncpg.Pool], body: TranscribeRequest
+) -> EnqueueResponse:
+    job_id = await enqueue(
+        pool,
+        body.account_id,
+        "transcribe",
+        {"chat_id": body.chat_id, "message_id": body.message_id},
+    )
+    return EnqueueResponse(job_id=job_id)
+
+
 @router.post("/dialogs/sync", status_code=201)
 async def enqueue_sync_dialogs(
     pool: FromDishka[asyncpg.Pool], body: SyncDialogsRequest
@@ -115,3 +134,18 @@ async def get_job(pool: FromDishka[asyncpg.Pool], job_id: int) -> JobView:
     if row is None:
         raise HTTPException(status_code=404, detail="job not found")
     return _to_view(row)
+
+
+@router.post("/jobs/{job_id}/cancel")
+async def cancel_job(pool: FromDishka[asyncpg.Pool], job_id: int) -> JobView:
+    row = await pool.fetchrow(
+        "UPDATE jobs SET status = 'canceled', finished_at = now(), "
+        "updated_at = now() WHERE id = $1 AND status IN ('pending', 'running') "
+        "RETURNING *",
+        job_id,
+    )
+    if row is not None:
+        return _to_view(row)
+    if await pool.fetchval("SELECT 1 FROM jobs WHERE id = $1", job_id) is None:
+        raise HTTPException(status_code=404, detail="job not found")
+    raise HTTPException(status_code=409, detail="job already finished")