restructured

backend/auth.py

@@ -78,4 +78,14 @@ def get_current_user(
         algorithms=[ALGORITHM]
     )
 
-    return payload["user_id"]
+    return payload["user_id"]
+
+def get_user(user_id):
+    return fetch_one(
+        """
+        SELECT id, username
+        FROM users
+        WHERE id = ?
+        """,
+        (user_id,)
+    )