code: def upgrade() -> None:
      # ### commands auto generated by Alembic - please adjust! ###
      op.add_column(
          "datasets",
          sa.Column(
              "allow_extra_metadata",
              sa.Boolean(),
              server_default=sa.text("true"),
              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