code: def upgrade():
      with op.batch_alter_table("chat_bots") as batch_op:
          batch_op.add_column(sa.Column("agent_id", sa.Integer()))
          batch_op.create_foreign_key(
              "fk_agent_id", "agents", ["agent_id"], ["id"]
          )
  
imports: from alembic import op
  import sqlalchemy
label_desc: Use image node_id 1 for calling a global function with example usage: upgrade() without return types