code: def upgrade():
      # ### commands auto generated by Alembic - please adjust! ###
      with op.batch_alter_table("ab_user") as batch_op:
          batch_op.alter_column(
              "email",
              existing_type=sa.VARCHAR(length=64),
              type_=sa.String(length=320),
              nullable=False,
          )
  
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