first commit

api/app/routers/errors.py

@@ -0,0 +1,16 @@
+from collections.abc import Callable
+from typing import TypeVar
+
+from fastapi import HTTPException, status
+
+T = TypeVar("T")
+
+
+def as_501(call: Callable[[], T]) -> T:
+    try:
+        return call()
+    except NotImplementedError as exc:
+        raise HTTPException(
+            status_code=status.HTTP_501_NOT_IMPLEMENTED,
+            detail=str(exc),
+        ) from exc