The single Postgres pool (shared by HTTP handlers and the crawler/analysis
daemons) hardcoded max_connections=10 with no acquire_timeout, so under
saturation callers hung on the driver's silent 30s default. Add a DbConfig
(DB_MAX_CONNECTIONS default 20, DB_ACQUIRE_TIMEOUT_SECS default 10, clamped
to >=1) and apply both in PgPoolOptions.
Bump to 0.124.4.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>