new init

apps/backend/app/services/sessions.py

@@ -0,0 +1,19 @@
+import secrets
+from sqlalchemy.orm import Session as DBSession
+from app.models.session import Session as SessionModel
+
+def create_session(db: DBSession, user_id: int) -> str:
+    token = secrets.token_hex(32)
+    session = SessionModel(user_id=user_id, token=token)
+    db.add(session)
+    db.commit()
+    db.refresh(session)
+    return token
+
+def get_user_by_token(db: DBSession, token: str):
+    session = db.query(SessionModel).filter_by(token=token).first()
+    return session.user if session else None
+
+def delete_session(db: DBSession, token: str):
+    db.query(SessionModel).filter_by(token=token).delete()
+    db.commit()