refactor: admin api using session factory (#29628)

api/core/db/session_factory.py

@@ -0,0 +1,38 @@
+from sqlalchemy import Engine
+from sqlalchemy.orm import Session, sessionmaker
+
+_session_maker: sessionmaker | None = None
+
+
+def configure_session_factory(engine: Engine, expire_on_commit: bool = False):
+    """Configure the global session factory"""
+    global _session_maker
+    _session_maker = sessionmaker(bind=engine, expire_on_commit=expire_on_commit)
+
+
+def get_session_maker() -> sessionmaker:
+    if _session_maker is None:
+        raise RuntimeError("Session factory not configured. Call configure_session_factory() first.")
+    return _session_maker
+
+
+def create_session() -> Session:
+    return get_session_maker()()
+
+
+# Class wrapper for convenience
+class SessionFactory:
+    @staticmethod
+    def configure(engine: Engine, expire_on_commit: bool = False):
+        configure_session_factory(engine, expire_on_commit)
+
+    @staticmethod
+    def get_session_maker() -> sessionmaker:
+        return get_session_maker()
+
+    @staticmethod
+    def create_session() -> Session:
+        return create_session()
+
+
+session_factory = SessionFactory()