Add standardised SQL connection setup for microservices.

slingshot_microservice/typing.py

@@ -1,6 +1,11 @@
 from __future__ import annotations
 
-from typing import BinaryIO, Generator, Protocol, TypeAlias
+from typing import TYPE_CHECKING, BinaryIO, Generator, Protocol, TypeAlias
+
+if TYPE_CHECKING:
+    from sqlalchemy.engine.base import Connection as SqlAlchemyConnection
+else:
+    SqlAlchemyConnection = object
 
 CaseVariable: TypeAlias = bool | int | str
 
@@ -19,6 +24,7 @@ class ProcessFn(Protocol):
         request: int,
         read_file: ReadFileFn,
         write_file: WriteFileFn,
+        connection: SqlAlchemyConnection,
     ) -> Generator[tuple[int, CaseVariable], None, None]: ...