code: def downgrade():
      """Create dag_stats table"""
      op.create_table(
          "dag_stats",
          sa.Column("dag_id", sa.String(length=250), nullable=False),
          sa.Column("state", sa.String(length=50), nullable=False),
          sa.Column("count", sa.Integer(), nullable=False, default=0),
          sa.Column(
              "dirty", sa.Boolean(), nullable=False, default=False
          ),
          sa.PrimaryKeyConstraint("dag_id", "state"),
      )
  
imports: from __future__ import annotations
  import sqlalchemy
  from alembic import op
label_desc: Use image node_id 2 for calling a global function with example usage: downgrade() without return types