Nothing should be published until the code that imports it on a user's machine has imported it here. The exporter and the importer are two descriptions of one storage format, and every other tier tests the importer against a *fixture* rather than against the file being shipped — a second description free to be wrong in the same direction as the code reading it. That is how #258 reached everyone: the importer positioned its batch walk with a Go `string` cursor against this file's 16-byte `mbid` column, and SQLite neither coerces between TEXT and BLOB nor complains about the comparison, so the walk merged no rows and never advanced. The fixture guarding that walk writes the old text encoding, and the only compact fixture is one row, below the batch size, so the bound query never ran. Both were green throughout, and no install could finish a first index build. `TestImportPublishedArtifact` takes the published file and runs the client's own path over it — checksum, decompress, merge — and asserts that what the artifact holds is what the client ends up with: the row count, the rows carrying a listen count, an FTS index in step with the table, and one row read back through the app's own MBID conversions. It skips without `YJ_CORE_INDEX_ARTIFACT`, so an ordinary run pays nothing. It needs no Wails, which is why the step runs it under the indexbuild tag: that container has no GTK. Measured on the current artifact, 64.8 MB compressed: 39 seconds including the decompress. Verified against the pre-fix comparison behaviour, the step goes red in about 3 seconds — the strictly-advancing guard fails the import with a named reason rather than the day-long spin it used to produce. Refs #258