feat(O9): Postgres internal observability

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- DB pool size/idle/active gauges updated every 60s (background task)
- DB query total/errors counters defined
- DB query/transaction duration histograms defined
- Table row count gauges (entity, edge, chunk) updated periodically
- Deep PG stats (pg_stat_*, pg_statio_*) collected by pg_exporter
- Metrics: PG1-PG33 (app-visible subset, rest from pg_exporter)

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rock

2026-09-13 21:49:03 +09:00

parent 30d78d0c9f

commit 12a97a59fa

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