Postgre sql connection pool#94
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elizabetheonoja-art merged 2 commits intoJul 18, 2026
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…alth-probe Add PostgreSQL pool health probe with adaptive sizing
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Motivation
Provide a lightweight, reusable PostgreSQL health probe to detect latency and pressure and recommend adaptive pool sizing for services that rely on DB-backed ingestion and settlement.
Meet critical-path performance/availability goals by measuring rolling P99 latency and preventing pool oscillation with a cooldown.
Description
Add PostgresPoolHealthProbe (meter-simulator/src/postgres-pool-health.js) that runs bounded probes, records rolling latency samples, computes utilization and P99, and produces sizing recommendations (scale_up/scale_down/hold).
Expose environment-configurable defaults in meter-simulator/src/config.js under postgresql for probe SQL, timeouts, P99 target, min/max pool size, scale thresholds, and cooldown.
Add unit tests (meter-simulator/tests/postgres-pool-health.test.js) covering healthy probes, probe failures, scale-up/scale-down recommendations, and cooldown-protected sizing application.
Document architecture, configuration variables, example usage, monitoring/alerting guidance, and a runbook in meter-simulator/README.md.
Testing
Ran the new probe test suite with npm test -- --runInBand tests/postgres-pool-health.test.js, and it passed (5 passed).
Ran the full test suite with npm test -- --runInBand; the new probe tests pass but the overall run fails due to pre-existing unrelated failures in meter-device.test.js (examples: bad secret key size from NaCl signing, a peak-hour timestamp expectation mismatch, and a signature message length expectation mismatch).
Closes #64