harden delivery pipeline and production runtime

app/ml/feature_store.py

@@ -1,8 +1,8 @@
 from __future__ import annotations
 
 from collections import defaultdict
-from dataclasses import dataclass, field
-from typing import Iterable
+from collections.abc import Iterable
+from dataclasses import dataclass
 
 
 @dataclass(frozen=True)
@@ -28,4 +28,4 @@ class FeatureStore:
         return series[-1] if series else None
 
     def all(self) -> list[FeatureVector]:
-        return [vector for vectors in self._vectors.values() for vector in vectors]
+        return [vector for vectors in self._vectors.values() for vector in vectors]