migrate db.find_ratings to SQLAlchemy

unwind/models.py

@@ -12,8 +12,8 @@ from typing import (
     Literal,
     Mapping,
     Type,
-    TypeVar,
     TypedDict,
+    TypeVar,
     Union,
     get_args,
     get_origin,
@@ -318,6 +318,8 @@ class Movie:
         self._is_lazy = False
 
 
+movies = Movie.__table__
+
 _RelationSentinel = object()
 """Mark a model field as containing external data.
 
@@ -372,6 +374,8 @@ class Rating:
         )
 
 
+ratings = Rating.__table__
+
 Access = Literal[
     "r",  # read
     "i",  # index