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fix(db,frontend): reserve DB connections for API and reduce frontend polling

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Background tasks (ingestion, PDF resolution, scheduler) now acquire an
asyncio.Semaphore before checking out a DB connection, guaranteeing at
least N connections remain available for API request handlers. Removes
duplicate polling loop from PublicationsPage, debounces publication
reload on run-status changes, and increases poll interval from 5s to 15s
since SSE handles live discovery.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
Justin Visser 2026-03-02 19:09:06 +01:00
parent a490e14126
commit f50b609a36
11 changed files with 97 additions and 69 deletions
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7
tests/unit/test_publication_pdf_queue_policy.py
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@ -1,5 +1,6 @@
from __future__ import annotations
import contextlib
from datetime import UTC, datetime, timedelta
from types import SimpleNamespace
from typing import Any
@ -238,8 +239,10 @@ async def test_run_resolution_task_disables_arxiv_for_remaining_batch(
first = _row()
second: Any = SimpleNamespace(**{**first.__dict__, "publication_id": 2})
def _raise_session_factory_error():
@contextlib.asynccontextmanager
async def _raise_background_session_error():
raise RuntimeError("skip user settings lookup in test")
yield # pragma: no cover
async def _fake_resolve_publication_row(
*,
@ -253,7 +256,7 @@ async def test_run_resolution_task_disables_arxiv_for_remaining_batch(
calls.append((int(row.publication_id), bool(allow_arxiv_lookup)))
return row.publication_id == 1
monkeypatch.setattr(pdf_queue_resolution, "get_session_factory", _raise_session_factory_error)
monkeypatch.setattr(pdf_queue_resolution, "background_session", _raise_background_session_error)
monkeypatch.setattr(pdf_queue_resolution, "_resolve_publication_row", _fake_resolve_publication_row)
await pdf_queue_resolution._run_resolution_task(