refactor(fc2c-i): sweep blueprints + ml tasks onto shared get_session (covers tasks/ml.py, a survey gap)

backend/app/api/aliases.py

@@ -2,27 +2,15 @@
 
 from quart import Blueprint, jsonify, request
 
-from ..extensions import make_engine, make_session_factory
+from ..extensions import get_session
 from ..services.ml.aliases import AliasService
 
 aliases_bp = Blueprint("aliases", __name__, url_prefix="/api")
 
-_engine = None
-_Session = None
-
-
-def _session_factory():
-    global _engine, _Session
-    if _engine is None:
-        _engine = make_engine()
-        _Session = make_session_factory(_engine)
-    return _Session
-
 
 @aliases_bp.route("/aliases", methods=["GET"])
 async def list_aliases():
-    Session = _session_factory()
-    async with Session() as session:
+    async with get_session() as session:
         rows = await AliasService(session).list_all()
     return jsonify(
         [
@@ -43,8 +31,7 @@ async def create_alias():
     required = {"alias_string", "alias_category", "canonical_tag_id"}
     if not body or not required.issubset(body):
         return jsonify({"error": f"required: {sorted(required)}"}), 400
-    Session = _session_factory()
-    async with Session() as session:
+    async with get_session() as session:
         await AliasService(session).create(
             body["alias_string"],
             body["alias_category"],
@@ -58,8 +45,7 @@ async def create_alias():
     "/aliases/<alias_string>/<alias_category>", methods=["DELETE"]
 )
 async def remove_alias(alias_string: str, alias_category: str):
-    Session = _session_factory()
-    async with Session() as session:
+    async with get_session() as session:
         await AliasService(session).remove(alias_string, alias_category)
         await session.commit()
     return "", 204