SqliteDatabaseBackup.replace reopens the connection in a finally block, so
it runs even when the swap throws. A reopen that failed there was stored
and then dropped: the swap's exception propagated past the return that
would have carried it. The demo reset caught that swap error, logged
"Failed to restore baseline" and returned normally, leaving the instance
without a database connection and nothing in the log to say so. Before
the port, the same branch awaited reinitialize() and its rejection reached
the tick's log line.
replace now throws a DatabaseConnectionLostError when both steps fail. It
carries the swap error and has the reopen failure as its cause, and its
message tells the operator to restart. The demo reset lets that error
through to DemoResetJob's tick, which logs it, and still logs and skips a
failed swap whose reopen succeeded. A restore that hits it answers the
same 500 as any other thrown restore error, with both failures in the
server log.
Backup, restore and the demo reset each handled the SQLite file
themselves: backup.impl closed and reinitialized the connection, built
MaintenanceRepository with new, and assumed the database was
data/travel.db. That tied the whole chain to one local file and hid two
bugs.
They now go through DATABASE_BACKUP, a port declared in the shared
database kernel (snapshot, verify, keep a copy before a restore, replace).
SqliteDatabaseBackup implements it with what the code did before:
VACUUM INTO for a consistent copy, and a close, copy, sidecar drop,
rename and reopen through DatabaseLifecycle for a restore. BackupService
injects it and hands it to backup.impl. The demo reset and the baseline
save use the same port; the first baseline is saved by DemoResetJob once
the app is up, because the boot-time seed runs before anything can be
injected. Another engine can plug in a logical dump behind the port.
Fixes on the way:
- The backup and the restore ignored TREK_DB_FILE. The backup looked for
data/travel.db and, with the database elsewhere, silently left it out
of the archive; the restore wrote data/travel.db and never replaced
the live database. Both now use DatabaseLifecycle.file, the path the
connection runs on, and the pre-restore copy sits next to it.
- A failed VACUUM INTO fell back to archiving the live WAL-mode file
without a word, the torn copy the snapshot exists to prevent. The
backup now fails: nothing is archived or committed, the existing
backups are untouched, a partial snapshot is removed, and the log says
why. A missing database file and a failed checkpoint are logged too.
Maurice