Fix existing data (remove dangling rows) #46
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The fix in #45 fixed the underlying cause of dangling rows not being removed.
This adds a migration to remove those rows (if any) from existing databases. While the migration script does not directly remove the rows, they will be removed as soon as the next sync completes. The migration script does not write any data if there are no dangling rows.
For reference, on Flutter desktop, the migration query takes around 0.35s to run with 1M rows.