docs: Update task board and align development plan

auth.py

@@ -79,13 +79,27 @@ async def auth_twitch_callback(code: str, state: str, request: Request, db: Sess
         user_response = await client.get(users_url, headers=headers)
         user_data = user_response.json()["data"][0]
 
-    # TODO: Upsert user into our database
-    # For now, we'll just return the user data as a proof of concept.
-    
     # Encrypt the tokens for storage
     encrypted_tokens = security.encrypt_tokens(access_token, refresh_token)
 
-    # Here you would create or update the user in your database
-    # user = db.query(models.User).filter_by(platform_user_id=user_data['id']).first() ... etc.
+    # --- Database Upsert Logic ---
+    # Check if the user already exists in our database
+    user = db.query(models.User).filter(models.User.platform_user_id == user_data['id']).first()
 
-    return {"message": "Twitch login successful!", "user": user_data, "encrypted_tokens": encrypted_tokens}
+    if user:
+        # If user exists, update their details
+        user.username = user_data['login']
+        user.encrypted_tokens = encrypted_tokens
+    else:
+        # If user does not exist, create a new record
+        user = models.User(
+            platform_user_id=user_data['id'],
+            username=user_data['login'],
+            platform="twitch",
+            encrypted_tokens=encrypted_tokens
+        )
+        db.add(user)
+    
+    db.commit()
+
+    return {"message": f"Successfully authenticated as {user_data['display_name']}. User data has been saved."}