fix(sync): remove invalid col.indexes access that crashed sync script

scripts/sync_plugin_schema.py

@@ -263,18 +263,6 @@ async def sync_plugin_schemas() -> None:
                         except Exception as exc:
                             logger.error("Failed to add index '%s' on '%s': %s", idx.name, table_name, exc)
 
-                # Also check for column-level indexes (index=True on mapped_column)
-                for col in mapper.columns:
-                    for idx in col.indexes:
-                        if idx.name and idx.name not in db_indexes:
-                            index_ddl = _build_index_ddl(idx)
-                            try:
-                                await conn.execute(text(index_ddl))
-                                logger.info("Added index '%s' on table '%s'", idx.name, table_name)
-                                added_indexes += 1
-                            except Exception as exc:
-                                logger.error("Failed to add index '%s' on '%s': %s", idx.name, table_name, exc)
-
         logger.info(
             "Schema sync complete: %d columns added, %d indexes added",
             added_columns,