feat: add 'missing' column to multiple tables and update related handlers for missing entries

backend/handler/database/firmware_handler.py

@@ -65,10 +65,10 @@ class DBFirmwareHandler(DBBaseHandler):
         )
 
     @begin_session
-    def purge_firmware(
+    def mark_missing_firmware(
         self, platform_id: int, fs_firmwares_to_keep: list[str], session: Session = None
     ) -> Sequence[Firmware]:
-        purged_firmware = (
+        missing_firmware = (
             session.scalars(
                 select(Firmware)
                 .order_by(Firmware.file_name.asc())
@@ -83,13 +83,14 @@ class DBFirmwareHandler(DBBaseHandler):
             .all()
         )
         session.execute(
-            delete(Firmware)
+            update(Firmware)
             .where(
                 and_(
                     Firmware.platform_id == platform_id,
                     Firmware.file_name.not_in(fs_firmwares_to_keep),
                 )
             )
+            .values(**{"missing": True})
             .execution_options(synchronize_session="evaluate")
         )
-        return purged_firmware
+        return missing_firmware