perf(*): bound list queries, batch fetches, harden media downloads

backend/src/api/routers/backfill.py

@@ -8,6 +8,7 @@ from fastapi import APIRouter, HTTPException, Query
 from pydantic import BaseModel
 
 from utils.jobs import enqueue
+from utils.read.models import DEFAULT_LIMIT, Page
 
 router = APIRouter(prefix="/api", tags=["backfill"], route_class=DishkaRoute)
 
@@ -130,16 +131,26 @@ async def list_jobs(
     pool: FromDishka[asyncpg.Pool],
     account_id: Annotated[int, Query()],
     status: Annotated[str | None, Query()] = None,
+    limit: Annotated[int, Query()] = DEFAULT_LIMIT,
+    offset: Annotated[int, Query()] = 0,
 ) -> list[JobView]:
+    page = Page(limit=limit, offset=offset)
     if status is None:
         rows = await pool.fetch(
-            "SELECT * FROM jobs WHERE account_id = $1 ORDER BY id DESC", account_id
+            "SELECT * FROM jobs WHERE account_id = $1 "
+            "ORDER BY id DESC LIMIT $2 OFFSET $3",
+            account_id,
+            page.capped_limit,
+            page.offset,
         )
     else:
         rows = await pool.fetch(
-            "SELECT * FROM jobs WHERE account_id = $1 AND status = $2 ORDER BY id DESC",
+            "SELECT * FROM jobs WHERE account_id = $1 AND status = $2 "
+            "ORDER BY id DESC LIMIT $3 OFFSET $4",
             account_id,
             status,
+            page.capped_limit,
+            page.offset,
         )
     return [_to_view(row) for row in rows]