X_MIGRATION_SNAPSHOT_MISSING

the newest migration records no schema snapshot

As of 2026-08: x db gen found the newest migration on disk carrying no <id>.snapshot.json sidecar — deleted, or hand-written without one. Every generated migration writes the sidecar the next generation diffs against, so there is nothing to diff the entities against. Refused rather than defaulted to the empty schema, which would emit create table for every table the database already holds. A scaffold no longer starts in this state: x new writes no migration at all, and x db gen is the one writer of that directory. x doctor reports it too, As of 2026-08, so the condition is visible before a generate hits it

git checkout -- packages/db/migrations/<id>.snapshot.json, or, when it was never written, delete the whole migration first and regenerate: rm packages/db/migrations/<id>.* && x db gen "<name>". That order is the fix — naming x db gen while the file is still there re-raises this code. The same condition reaches x db migrate as X_DB_DRIFT with an unknown-schema difference, whose fix: names the same two remedies in the same order