fix: remove settings, too, when deleting an identity

src/db-sql/migration.ts

@@ -79,8 +79,8 @@ const MIG_004_SQL = `
       warnIfTestServer = (SELECT warnIfTestServer FROM settings WHERE id = 1);
 
   -- CLEANUP: Remove orphaned settings records and clear legacy activeDid values
+  -- which usually simply clears out the MASTER_SETTINGS_KEY record.
   -- This completes the migration from settings-based to table-based active identity
-  -- Use guarded operations to prevent accidental data loss
   DELETE FROM settings WHERE accountDid IS NULL;
   UPDATE settings SET activeDid = NULL;
 `;