code: def downgrade():
      op.drop_table("chart")
      op.drop_table("variable")
      op.drop_table("user")
      op.drop_index("ti_state_lkp", table_name="task_instance")
      op.drop_index("ti_pool", table_name="task_instance")
      op.drop_index("ti_dag_state", table_name="task_instance")
      op.drop_table("task_instance")
      op.drop_table("slot_pool")
      op.drop_table("sla_miss")
      op.drop_table("log")
      op.drop_index("job_type_heart", table_name="job")
      op.drop_table("job")
      op.drop_table("import_error")
      op.drop_table("dag_pickle")
      op.drop_table("dag")
      op.drop_table("connection")
      op.drop_table("xcom")
  
imports: from __future__ import annotations
  import sqlalchemy
  from alembic import op
  from sqlalchemy import func, inspect
  from airflow.migrations.db_types import StringID
label_desc: Use image node_id 2 for calling a global function with example usage: downgrade() without return types