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

backend/app/api/gallery.py

@@ -2,22 +2,11 @@
 
 from quart import Blueprint, jsonify, request
 
-from ..extensions import make_engine, make_session_factory
+from ..extensions import get_session
 from ..services.gallery_service import GalleryService
 
 gallery_bp = Blueprint("gallery", __name__, url_prefix="/api/gallery")
 
-_engine = None
-_Session = None
-
-
-def _session_factory():
-    global _engine, _Session
-    if _engine is None:
-        _engine = make_engine()
-        _Session = make_session_factory(_engine)
-    return _Session
-
 
 @gallery_bp.route("/scroll", methods=["GET"])
 async def scroll():
@@ -29,8 +18,7 @@ async def scroll():
     tag_id_raw = request.args.get("tag_id")
     tag_id = int(tag_id_raw) if tag_id_raw else None
 
-    Session = _session_factory()
-    async with Session() as session:
+    async with get_session() as session:
         svc = GalleryService(session)
         try:
             page = await svc.scroll(cursor=cursor, limit=limit, tag_id=tag_id)
@@ -63,8 +51,7 @@ async def scroll():
 async def timeline():
     tag_id_raw = request.args.get("tag_id")
     tag_id = int(tag_id_raw) if tag_id_raw else None
-    Session = _session_factory()
-    async with Session() as session:
+    async with get_session() as session:
         svc = GalleryService(session)
         buckets = await svc.timeline(tag_id=tag_id)
     return jsonify([{"year": b.year, "month": b.month, "count": b.count} for b in buckets])
@@ -79,8 +66,7 @@ async def jump():
         return jsonify({"error": "year and month query params required"}), 400
     tag_id_raw = request.args.get("tag_id")
     tag_id = int(tag_id_raw) if tag_id_raw else None
-    Session = _session_factory()
-    async with Session() as session:
+    async with get_session() as session:
         svc = GalleryService(session)
         cursor = await svc.jump_cursor(year=year, month=month, tag_id=tag_id)
     return jsonify({"cursor": cursor})
@@ -88,8 +74,7 @@ async def jump():
 
 @gallery_bp.route("/image/<int:image_id>", methods=["GET"])
 async def image_detail(image_id: int):
-    Session = _session_factory()
-    async with Session() as session:
+    async with get_session() as session:
         svc = GalleryService(session)
         payload = await svc.get_image_with_tags(image_id)
     if payload is None: