regirstation works but shared links broken

app/dependencies.py

@@ -92,3 +92,20 @@ async def get_optional_current_user(
         return user
     except JWTError:
         return None
+
+
+def get_user_from_token(token: str, db: Session) -> Optional[User]:
+    """
+    Get user from JWT token string (for WebSocket authentication).
+    Returns None if token is invalid.
+    """
+    try:
+        payload = jwt.decode(token, settings.SECRET_KEY, algorithms=[settings.ALGORITHM])
+        user_id: str = payload.get("sub")
+        if user_id is None:
+            return None
+
+        user = db.query(User).filter(User.id == user_id).first()
+        return user
+    except JWTError:
+        return None