86a6e0aaac
The subscription notifier elects one leader via a host-local flock (THERMOGRAPH_SINGLETON_LOCK) so multiple uvicorn workers on one host don't each run it. Under multi-host Swarm that guard is insufficient: each host would independently elect its own leader, multiplying Open-Meteo quota use N-fold again. Add claim_pg(key) alongside the existing claim(lock_path): a cluster-wide Postgres advisory lock, visible to every host talking to the same database. The holding connection is dedicated and kept for the process lifetime (advisory locks are session-scoped); a dead connection is dropped and re-election retried on the next call. claim_leader() dispatches between the two mechanisms from env: THERMOGRAPH_SINGLETON_PG (+ Postgres) -> claim_pg; else THERMOGRAPH_SINGLETON_LOCK -> claim; else always leader, unchanged. Wired in at web/app.py in place of the direct claim() call. Off by default, so today's single-host behavior is unaffected. |
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| .. | ||
| __init__.py | ||
| app.py | ||
| content.py | ||
| homepage.py | ||
| schemas.py | ||
| views.py | ||