Give shepherd_db's healthcheck a start_period so slow boots don't fail the stack - #141
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…l the stack `docker compose up` intermittently died with "dependency shepherd_db failed to start". The DB healthcheck had no start_period, so Docker counted probe failures from container start: 5 retries x 2s marked Postgres unhealthy about 10s in, which is often before it has even begun accepting connections. The "FATAL: the database system is starting up" line in the logs is a probe being correctly rejected mid-recovery, and it lands on the last retry. Also probe 127.0.0.1 instead of the default Unix socket. On a first run the postgres entrypoint starts a temporary socket-only server to apply init_db.sql; a socket probe reports ready against that, dependents connect, and the entrypoint then shuts it down under them. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01PQeAtdPFUgZ1BTB3UB6oXc
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