feat: add PostgreSQL replication health auto rebuild#40
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Check PostgreSQL leader and replica replication state with read-only SQL, report replication readiness on Component status, and create a guarded RebuildInstance OpsRequest after persistent replica failure. Also add the OpsRequest RBAC marker and focused replication health tests.
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Check PostgreSQL leader and replica replication state with read-only SQL, report replication readiness on Component status, and create a guarded RebuildInstance OpsRequest after a replica failure persists beyond the configured window.
The health guard finds the PostgreSQL primary and running replicas from the Component workload, then verifies primary-side replication slots and replica-side WAL receiver state. It reports the result through the PostgreSQLReplicationReady condition so users can see whether replication is healthy without manually execing into pods.
When a rebuildable replica failure such as an inactive slot, missing WAL receiver, or non-streaming WAL receiver remains unhealthy long enough, the controller creates a RebuildInstance OpsRequest for that replica. The auto-rebuild path is protected by the failure window, cooldown, running OpsRequest detection, duplicate DAG checks, and leader-pod exclusion to avoid repeated or conflicting rebuilds.
Also add the OpsRequest RBAC marker and focused replication health tests.