migrate.php wrapped each migration file's statements in
begin_transaction()/rollback(), but MySQL DDL statements cause an
implicit commit — so a rollback couldn't actually undo earlier DDL
already executed within the same file. A migration failing partway
left the DB altered but unrecorded, and the next run retried the
whole file from statement 1, hitting "already exists" errors not on
the safe-to-ignore allowlist and permanently wedging the runner.
Removed the transaction wrapper (it only gave false confidence) and
added a migration_progress table that records the index of the last
successfully-executed statement in each file. A re-run after a
partial failure now resumes right after the last success instead of
re-executing already-applied DDL. Verified against real MariaDB with
a 4-statement migration where statement 3 fails: run 1 correctly
applies statements 1-2 and records progress at index 1; after fixing
the bad statement, run 2 resumes at statement 3, completes, and
clears the progress marker.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_015nCxwFFsy8ouMWzn56rPVP
jaredandClaude Sonnet 5
fba251b85d