Only delete specified user. cat_name is already the string.

cogs/commands/data_management.py

@@ -113,10 +113,10 @@ class DataManagementCog(commands.Cog, name="Table Management"):
         stmt = select(Category.CategoryName).where(Category.CategoryId == int(category_id))
         category_name = session.scalar(stmt)
 
-        stmt = select(Score).where(Score.CategoryId == int(category_id))
+        stmt = select(Score).where(Score.CategoryId == int(category_id)).where(Score.UserName == user_name)
 
-        for score in session.scalars(stmt):
-            session.delete(score)
+        # there should only be one because category id and username are a composite primary key in score
+        session.delete(session.scalar(stmt))
         session.commit()
 
         await send_highscore_message(interaction.guild.get_channel(group.ChannelId), group)