Files
gh-christianlouis-docuelevate/benchmark_notifications.py
google-labs-jules[bot] fe20e02f78 perf(api): fix n+1 query issue in user notification preferences update
- Added a benchmark script in tests/test_notifications_api.py that proved the N+1 issue issue.
- Replaced iterative DB lookups inside `for item in body.preferences:` with single pre-fetch query and local `prefs_dict` lookups.
- Verified test benchmark time drops from ~0.0964s to ~0.0141s for a batch of 100 items.

Co-authored-by: christianlouis <361235+christianlouis@users.noreply.github.com>
2026-03-16 09:20:41 +00:00

51 lines
1.4 KiB
Python

import json
import time
import pytest
from app.database import get_db
from app.models import UserNotificationTarget, UserNotificationPreference
from app.main import app
from tests.test_notifications_api import _make_client, _OWNER, _cleanup
import statistics
def run_benchmark(notif_engine, notif_session, client, items_count, iterations=5):
# Setup
target = UserNotificationTarget(
owner_id=_OWNER,
channel_type="webhook",
name="My Webhook",
config=json.dumps({"url": "https://x.com"}),
)
notif_session.add(target)
notif_session.commit()
notif_session.refresh(target)
# Generate big payload
preferences = []
for i in range(items_count):
preferences.append({
"event_type": f"event.type.{i}",
"channel_type": "webhook",
"is_enabled": True,
"target_id": target.id,
})
payload = {"preferences": preferences}
# Warm up
client.put("/api/user-notifications/preferences", json=payload)
times = []
for _ in range(iterations):
# Alter the values a bit so it's a real update
for p in payload["preferences"]:
p["is_enabled"] = not p["is_enabled"]
start = time.time()
resp = client.put("/api/user-notifications/preferences", json=payload)
end = time.time()
assert resp.status_code == 200
times.append(end - start)
return statistics.mean(times)