test_lifespan_db_retry patched decnet.web.api.asyncio.sleep to skip the
DB-retry backoff. Problem: asyncio is a shared module — the patch leaks
to every caller that looked up asyncio.sleep via `import asyncio`,
including run_health_heartbeat's own sleep loop. That heartbeat task
spawns inside the same lifespan; with its sleep mocked, the while-loop
spins tight, starves cancellation, and leaves an orphan task that
pytest-timeout eventually signals — surfacing as the 'Task exception
was never retrieved' warnings the user saw when running the suite.
Fix: give decnet.web.api a local binding `_retry_sleep = asyncio.sleep`
for the DB-retry wait, and have the test patch that instead. Narrowly
scoped, no impact on asyncio.sleep callers elsewhere.
Test timing before: 12s with --timeout=10 (interrupted by signal).
Test timing after: 0.58s. Full tests/web slice: 27s → 7.1s with the
spurious warnings gone.
anti
ce6b4a4174