Phase 1 of the pgbouncer + pgAdmin rollout (runbook:
260507_pgbouncer_deployment.md). pgAdmin4 on the maintainer's laptop has
been exhausting tracksolid_db's max_connections, cascading to pgcli and
operations. Adds an internal-only pgbouncer service in transaction mode
with a small backend pool (default 15) so admin-tool sprawl can no
longer starve the ingest pipeline.
No client cutover this round - ingest, Grafana, webhook, and backup all
keep talking to timescale_db:5432 directly. SCRAM passthrough is wired
via a new pgbouncer role + public.user_lookup() function (migration 10).
The role is created with a placeholder password; sync_role_passwords()
in run_migrations.py replaces it from PGBOUNCER_AUTH_PASSWORD on every
container startup, mirroring the existing grafana_ro convention.
Requires PGBOUNCER_AUTH_PASSWORD to be set in .env before deploy.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
