Three fixes uncovered while bringing the backup-s3 integration suite to
12/12 against MinIO + Postgres:
- backupService.getDatabaseBackupInfo: pg's jsonb driver auto-parses
`statistics` / `table_checksums` to objects; the old JSON.parse() then
threw "[object Object]" is not valid JSON and the manifest dropped
database info silently. Accept both string and object inputs.
- backupService.runBackup: incremental path called
backupManifest.loadManifest() with an s3:// URI directly, which falls
through to fs.readFile() and ENOENTs — every "incremental" backup
silently downgraded to a full one. Added loadManifestFromAnywhere()
helper that downloads s3:// to a tmp file before delegating.
- backupManifest.generateIncrementalManifest: attached the `incremental`
section AFTER generateManifest() had already stamped
verification.total_checksum, so every incremental manifest failed
validateManifest() on read-back. Recompute the checksum after.
Test side: updated assertions to the current manifest shape
(`incremental.changes.modified_files_count`), Number()-coerce bigint
columns from pg, and gate the logger mock on UNMOCK_LOGGER for
diagnosing similar silent-failure modes in the future.
Paul Nothaft
e232f9f2cf