code: def upgrade():
      with op.batch_alter_table("key_value", schema=None) as batch_op:
          batch_op.alter_column(
              "value",
              existing_nullable=False,
              existing_type=sa.LargeBinary(),
              type_=sa.LargeBinary(length=2**24 - 1),
          )
  
imports: 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