Log which migrations are executed on startup

Current logs don't make it clear which ones are new or skipped
```
Migration 0/69 (0.0%)
Migration 1/69 (1.4%)
...
Migration 69/69 (100.0%)
All migrations were executed
```

Start at the startup migration path that produces the shown progress logs and inspect how migration status is currently determined. Confirm how new and skipped migrations are identified, then verify that startup logs distinguish those cases and still report completion clearly.

Written by the indexing model from the issue text.