*Sqlite to Postgres migration issue*\nWhy is it trying to create id=2, should it not be creating an id 8?\nIm trying to assign slice_id=84 to user_id = 4\n\n```(raised as a result of Query-invoked autoflush; consider using a session.no_autoflush block if this flush is occurring prematurely) (psycopg2.errors.UniqueViolation) duplicate key value violates unique constraint "slice_user_pkey" \n\nDETAIL: Key (id)=(2) already exists. \n[SQL: INSERT INTO slice_user (user_id, slice_id) VALUES (%(user_id)s, %(slice_id)s) RETURNING slice_user.id] \n\n[parameters: {'user_id': 4, 'slice_id': 84}] (Background on this error at: <http://sqlalche.me/e/13/gkpj>)```