LatticeLattice

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PgBouncer

Optional. Session pool for api/worker. dhcpd keeps a direct DSN because of LISTEN/NOTIFY.

Lab overlay:

docker compose -f deploy/compose/docker-compose.yml \
  -f deploy/compose/pgbouncer.yml up -d

That pools api and worker in session mode. dhcpd keeps a direct DSN. The config cache uses LISTEN lattice_config, which transaction pooling cannot carry.

Production:

  • Session pooling if you pool dhcpd at all.
  • Transaction pooling is fine for api/worker only.
  • Cap default_pool_size against max_connections.
  • Do not put a pool in front of Patroni’s REST API or WAL.

Most estates never need this. Scale dhcpd processes first. Postgres.