Hard rule: any service with a FQDN, multiple consumers, or concurrent
access MUST use PostgreSQL from day one. Documents the cost of "we'll
migrate later" based on the Gitea SQLite→PostgreSQL migration that cost
nearly a full day of productivity.
Extracted from cluster-bootstrap gitea-scaling session (2026-03-28).
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
