Previously when PG_REUSE=1 and PG_VERSION existed but the target database had
never been successfully created (e.g. devshell exited mid-init in a prior run),
postgres-init skipped createdb and the subsequent psql connection failed with
'database "<db>" does not exist'.
Now on reuse path we probe pg_database and create the target DB if missing,
making postgres-init fully idempotent across stale-state recovery.
Adds postgres-init-reuse-missing-db test.
Wrap db-tool, postgres-init, postgres-cleanup with lib.makeOverridable so
consumers can inject extension-enabled PostgreSQL via .override { postgresql = ...; }.
Add PG_CONF_FILE: when set, replaces script-generated postgresql.conf entirely
(runtime port and unix_socket_directories still appended/overridden).
Previous basename guard only ran the function when invoked as the
postgres-init binary, but consumer shellHooks source the script to
inherit POSTGRESQL_HOST/PGURL/etc. Sourcing left the function defined
but never called, leaving WIPE_PGURL/PGURL unset and breaking devshell
entry in proxydoe and ruststats.
- Replace central sentinel with watcher: each node polls peers discovered
via a single DNS name with multiple A records (e.g. peers.sentinella.com)
- Auto-detect own IPs via hostname -I; SELF env var available as optional
override for NAT/floating-IP setups
- Fix Basic Auth bug in router.sh: compare tok against AUTH_TOKENS instead
of unset $USER/$PASS
- Rename sentinel binary to watcher; drop unused shellplot dep
- Add inetutils to watcher runtime deps for hostname -I
- Update NixOS module: replace sentinel options with watcher p2p options
(peersDns, self, peersPort, peersScheme, pollingIntervalSec)
- Add sentinèlla test suite: probe-status-empty, probe-disk, watcher-state-file
