code: def upgrade():
      # ### commands auto generated by Alembic - please adjust! ###
      op.add_column(
          "clusters",
          sa.Column("broker_pass", sa.LargeBinary(), nullable=True),
      )
      op.add_column(
          "clusters",
          sa.Column(
              "broker_user", sa.String(length=255), nullable=True
          ),
      )
  
imports: import sqlalchemy
  from alembic import op
  from sqlalchemy_utils import EncryptedType
label_desc: Use image node_id 1 for calling a global function with example usage: upgrade() without return types