logan
c03c0b8ec4
The fix for the dropped catalog pins one table in one wrong shape, which is the failure that happened. What cost the rebuild was more general: a destructive repair added at `database.NewDB` -- the chokepoint every binary in this project shares -- without asking which binary it runs in. The next one will have a different name and a different reason. So `TestNoCacheTableIsRetiredHere` asserts the outcome instead: put every `datamap` Cache table into a shape the schema has moved past, open the database the way cmd/indexbuild does, and require all of them to still be there. Driving it from `datamap.ByKind` is what makes it cover tables nobody remembered -- flipping the policy back fails on five, including the two artist-credit tables added the same day, where the existing test fails on one. It asserts the rows survive too, because SQLite does an implicit DELETE before a DROP and a repair that recreated the table would look identical. And it accepts an error from `NewDB`, because that is the documented trade: loud is recoverable, gone is not. `scripts/index-cache-snapshot.sh` covers the half no test can reach. The volume holds the only copy of a catalog that costs hours of someone else's bandwidth to re-derive. `VACUUM INTO` rather than `cp`, since a byte copy of a live SQLite file is a corrupt file of plausible size; the resumable staging directory is skipped; and each snapshot is reopened and asked for its catalog row count before anything is rotated out. A corrupt source and an empty catalog were both exercised: each exits non-zero, removes its own output, and leaves the previous snapshots alone. docs/index-cache.md is the restore, and the reason to bother: a restored snapshot resolves to `refresh` and folds in the listens since, which is minutes against the 3-23h this rebuild has been estimating.