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

backend/app/api/settings.py

@@ -3,22 +3,11 @@
 from quart import Blueprint, jsonify, request
 from sqlalchemy import func, select
 
-from ..extensions import make_engine, make_session_factory
+from ..extensions import get_session
 from ..models import ImageRecord, ImportBatch, ImportSettings, ImportTask, Tag
 
 settings_bp = Blueprint("settings", __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
-
 
 _EDITABLE_FIELDS = (
     "min_width",
@@ -33,8 +22,7 @@ _EDITABLE_FIELDS = (
 
 @settings_bp.route("/settings/import", methods=["GET"])
 async def get_import_settings():
-    Session = _session_factory()
-    async with Session() as session:
+    async with get_session() as session:
         row = (
             await session.execute(select(ImportSettings).where(ImportSettings.id == 1))
         ).scalar_one()
@@ -55,8 +43,7 @@ async def update_import_settings():
     if not isinstance(body, dict):
         return jsonify({"error": "body must be a JSON object"}), 400
 
-    Session = _session_factory()
-    async with Session() as session:
+    async with get_session() as session:
         row = (
             await session.execute(select(ImportSettings).where(ImportSettings.id == 1))
         ).scalar_one()
@@ -70,8 +57,7 @@ async def update_import_settings():
 
 @settings_bp.route("/system/stats", methods=["GET"])
 async def system_stats():
-    Session = _session_factory()
-    async with Session() as session:
+    async with get_session() as session:
         total_images = (await session.execute(select(func.count(ImageRecord.id)))).scalar_one()
         total_tags = (await session.execute(select(func.count(Tag.id)))).scalar_one()
         storage_bytes = (