refactor(chat): rename metadata field

- Renamed `metadata` field to `message_metadata`
- Updated migration file accordingly
- Improved field name clarity

apps/chat/migrations/0002_chatmessage_metadata.py

@@ -12,7 +12,7 @@ class Migration(migrations.Migration):
     operations = [
         migrations.AddField(
             model_name='chatmessage',
-            name='metadata',
+            name='message_metadata',
             field=models.JSONField(blank=True, null=True),
         ),
     ]

apps/chat/models.py

@@ -87,7 +87,7 @@ class ChatMessage(models.Model):
         null=True
     )
     is_read = models.BooleanField(default=False, verbose_name="Is Read")
-    metadata = models.JSONField(blank=True, null=True)
+    message_metadata = models.JSONField(blank=True, null=True)
     sent_at = models.DateTimeField(auto_now_add=True, verbose_name="Sent At")        
     updated_at = models.DateTimeField(auto_now=True, verbose_name="Updated At")
     deleted_at = models.DateTimeField(null=True, blank=True, verbose_name="Deleted At")