allow to edit files

my_modules/db/ConvexDB.py

@@ -36,7 +36,7 @@ class ConvexDB(ConvexDbBase):
       "uploaded_at": int(x['uploaded_at']),
     } for x in data ]
 
-  async def add_file(self, file_name:str, file_size:str, note:str, content_type:str, expires_at:datetime, storage_id:str, user_id:str):
+  async def add_file(self, file_name:str, file_size:str, note:str, content_type:str, expires_at:datetime|None, storage_id:str, user_id:str):
     args = {
       'file_name': file_name, 'file_size': file_size, 'content_type': content_type,
       'note': note,
@@ -51,10 +51,19 @@ class ConvexDB(ConvexDbBase):
     )
     return data
 
-  async def update_file(self, file_id:str, file_name:str, note:str, expires_at:datetime, user_id:str):
+  async def update_file(self, file_id:str, file_name:str, note:str, expires_at:datetime|None, user_id:str):
+    args = {
+      'file_id': file_id,
+      'file_name': file_name,
+      'note': note,
+      'user_id': user_id
+    }
+    if expires_at:
+      args['expires_at'] = expires_at.isoformat()
+
     await self.run_mutation(
       name='files:updateFile',
-      args={ 'file_id': file_id, 'file_name': file_name, 'note': note, 'expires_at': expires_at.isoformat(), 'user_id': user_id }
+      args=args,
     )
 
   async def delete_file(self, file_id:str, user_id:str):