code: def upgrade():
      with op.batch_alter_table("serialized_dag") as batch_op:
          batch_op.alter_column(
              "data", existing_type=sa.JSON, nullable=True
          )
          batch_op.add_column(
              sa.Column(
                  "data_compressed", sa.LargeBinary, nullable=True
              )
          )
  
imports: from __future__ import annotations
  import sqlalchemy
  from alembic import op
label_desc: Use image node_id 1 for calling a global function with example usage: upgrade() without return types