ca169be0fb764a58ec9f83c09061bf4ee421db08
RobustCompressorTestRunner.teardown_databases now force-closes lingering connections before Django's DROP. CI step test-UTs-n-ITs (python manage.py test apps, full suite incl. channels-tagged tests) was failing post-test even when all 1165 tests passed — psycopg2.errors.ObjectInUse: database "test_python_tdd_test" is being accessed by other users / DETAIL: There is 1 other session using the database. Two-step leak: (1) core.settings.DATABASES['default']['conn_max_age']=600 keeps Postgres connections alive in the per-thread pool for 10 min (prod-perf default); (2) Channels' database_sync_to_async (16 call sites across apps.epic.tests.integrated.test_consumers's CursorMoveConsumerTest + SigHoverConsumerTest) runs in a process-wide asgiref threadpool — each worker thread accumulates its own DB connection that outlives the test + sits idle in the pool when teardown fires. Postgres refuses DROP while ANY session targets the row. Local dev unaffected: --exclude-tag=channels skips the consumer tests + SQLite has no DROP step. **Fix** lives entirely in core/runner.py's teardown override — connections.close_all() covers the main thread's runner connection; iterating old_config + running SELECT pg_terminate_backend(pid) FROM pg_stat_activity WHERE datname = %s AND pid <> pg_backend_pid() against each test DB kicks any worker-thread session still pinning the row. Both safe on a green run (DB about to be dropped anyway) + scoped to vendor == "postgresql" so SQLite local-dev is a clean no-op. Prod CONN_MAX_AGE=600 untouched — fix lives in the test runner, NOT in settings. 19/19 lyric UTs green via the new runner path (smoke verify the override is benign on SQLite); Postgres-side validated next CI run. Trap captured: [[feedback-test-teardown-conn-leak]] — symptom signature Ran NNNN tests / OK / Destroying.../ObjectInUse: ... belongs in CI-fail triage notes so future flakes get diagnosed in seconds instead of test-hunting
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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