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Deluan Quintão d0d5403708 feat(cli): add 'doctor' and 'search rebuild' commands to recover from FTS5 corruption (#6069)
* feat(db): add repair command to rebuild a corrupted FTS5 search index

A corrupted media_file_fts index made every scan fail with 'database disk
image is malformed', and sqlite3's built-in 'rebuild' command cannot repair
contentless FTS5 tables, leaving users to hand-drop tables and triggers.

Add 'navidrome db repair': it runs PRAGMA integrity_check, and when the
reported corruption is confined to the FTS5 search tables, drops and
recreates the three tables and their nine triggers and repopulates them
from the base tables (which hold all the data, so nothing is lost). The
result is verified with the FTS5-native 'integrity-check' command, which
reads only the rebuilt indexes instead of re-scanning the whole database
(on a 761MB production copy: ~9s full check, ~1s rebuild, sub-second
verify). A --rebuild flag forces the rebuild even when the check passes,
for silently desynced indexes. The rebuild refuses to run while migrations
are pending, and a schema-comparison test guards the duplicated DDL against
drifting from the migration.

The DbPath existence check and the YES confirmation prompt, previously
copy-pasted across the backup commands, are extracted into shared cmd
helpers used by both backup and repair.

Part of #6067

* fix(db): type the FTS migration version as int64 for 32-bit builds

The untyped constant defaults to int, which overflows on arm/v7 and 386.

* feat(db): split repair into 'db doctor' and 'search rebuild' commands

A single 'db repair' command promised more than it delivered: the only thing
it could actually repair was the search index, and its diagnosis and its fix
were welded together, so a forced rebuild paid the full integrity check twice.

Split it: 'navidrome db doctor' is strictly read-only, runs both PRAGMA
integrity_check and PRAGMA foreign_key_check, and routes the user (to
'search rebuild' when corruption is FTS-only, to backup/.recover otherwise).
'navidrome search rebuild' just rebuilds and verifies the FTS index, which
takes ~2s on a prod-size library instead of ~19s.

* refactor(cmd): extract a testable doctor function and bound foreign key output

Extract the doctor routing (check, classify, advise) into a function that
takes an io.Writer, so the advice paths are unit-tested and the process exit
happens in the cobra wrapper after the DB is closed (os.Exit was skipping the
deferred close, leaving WAL/SHM files behind on the unhealthy paths).

Aggregate foreign_key_check by (table, parent): the raw pragma emits one row
per orphan, which is unbounded output on a large corrupted library. Also
make confirmYES take an io.Reader, drop the unused return from the renamed
requireExistingDB, share the FTS table list with the tests, and stop the
schema-guard specs from paying for a seeded database they never use.

* docs(cmd): promise 'never alters your data' instead of 'never modifies the database'

Closing the doctor's connection can checkpoint a stale WAL into the main
file (as any SQLite tool does), so the byte-level claim was too strong. The
checks themselves are read-only and no logical content ever changes.

* fix(cmd): make 'db doctor' advice honest when checks are inconclusive

PRAGMA integrity_check stops at 100 errors and emits no marker row, so a
saturated result was being read as the whole picture. IntegrityCheck now sets
the limit itself and reports saturation as a truncated list, and doctor no
longer claims corruption is limited to the search index in that case.

Foreign key violations now print a next step instead of only flipping the
exit code: migrations run with foreign_keys off, so orphan rows are a
realistic leftover on a database that is not corrupt.

Also corrects the 'search rebuild' help, which promised that 'db doctor'
detects when a rebuild is needed -- integrity_check cannot see an index that
is merely out of sync; gives the never-migrated case its intended message
instead of a raw 'no such table: goose_db_version'; and extracts
rebuildSearchIndex so the database is closed before log.Fatal exits.

* refactor(cmd): promote 'db doctor' to a top-level 'doctor' command

The 'db' group held a single subcommand, and the checks planned for it reach
past the database: config, music folder permissions, external tools. None of
those belong under 'db'.

Promoting it also evens out the shape of the pair. The command that finds the
problem is now top-level alongside 'search rebuild', the command that fixes
it, matching the 'brew doctor' convention users already expect.

'db doctor' has never been released, so no alias or deprecation is needed.

* refactor(db): tighten the doctor and search rebuild internals

Follow-up cleanup with no behaviour change except where noted.

integrity_check now asks the pragma for one row beyond the reported limit and
treats that extra row as the proof it truncated, instead of inferring truncation
from a saturated count. That distinguishes a list of exactly 100 issues from one
that was cut short -- the old test could not, and 100 was SQLite's own default,
so passing it was a no-op.

ForeignKeyCheck returns []FKViolation instead of pre-formatted English, moving
the prose to the layer that already owns the CLI vocabulary. The goose table
probe shared with isSchemaEmpty becomes hasGooseTable, so 'has this database
ever been migrated' has one spelling. Also folds ftsMigrationApplied into
requireFTSMigration, lifts printFindings out of a closure that captured nothing,
names the FTS trigger suffixes once, and corrects the ftsSchemaDDL comment: the
drift test compares against the full migration chain, not the single frozen
migration it claimed.

* fix(db): verify the rebuilt search index before committing it

RebuildFTS committed its transaction and only then ran the FTS5 integrity
check, from the caller. A rebuild that produced a bad index was therefore
already persisted by the time anyone noticed, leaving the user worse off than
before they ran the command.

The check now runs inside the transaction, so a rebuild that does not verify
rolls back and leaves the original index in place. VerifyFTS keeps its *sql.DB
signature for callers outside a transaction; the shared body takes the small
execer interface that both *sql.DB and *sql.Tx satisfy.

Adds a spec for the rollback: it removes a column the repopulating SELECT
reads, so the transaction fails after the drops, and asserts the old index
still answers queries.

* refactor(cmd): drop the unused io.Reader parameter from confirmYES

The reader was added as a test seam that no test ever used: all three callers
pass os.Stdin. Back to fmt.Scanln, which drops the parameter and the now-unused
os import from backup.go and search.go.

* fix(cmd): stop promising a scan clears every foreign key violation

doctor told the user to run 'navidrome scan -f' for any foreign key
violation. SQLStore.GC only purges albums, artists, folders, annotations,
bookmarks, tags and playlist tracks, so orphans elsewhere survive it and the
next doctor run still reports them. player.user_id references user(id) and no
scan phase touches that table at all.

The advice now says a scan clears some of them and the rest have to be removed
by hand, which keeps the next step the earlier round asked for without claiming
a cleanup that does not happen.

* docs(db): trim over-long comments on the doctor and rebuild paths

Six comments ran past two lines or repeated something already stated nearby.
The RebuildFTS doc claimed the rebuild rolls back on a column mismatch, which
the new 'verifies before committing' sentence already implies, and a spec
comment restated that same rationale a second time.

* docs: drop em dashes from the comments added in this branch
2026-09-11 22:26:28 -04:00
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