Troubleshoot the Nightly Backup Reference

Symptom	Check
Database connection fails	Network path, TLS, credentials, and table permissions.
Incremental result is empty	Watermark column, timezone, late updates, and source transaction boundary.
Checksum changes	Field selection, serialization order, nulls, numeric representation, and digest algorithm.
Object write fails	Bucket, region, credentials, encryption policy, object path, and retry behavior.
Restore count differs	Snapshot completeness, duplicate keys, object inventory, rejects, and restore ordering.

Diagnose with synthetic data and a disposable destination. Restore to a staging table and compare counts and digests before planning any destructive swap.

Reference: Open the combined configuration.