code: def upgrade():
      op.add_column(
          "clusters",
          sa.Column(
              "verbose_name", sa.String(length=250), nullable=True
          ),
      )
      op.add_column(
          "dbs",
          sa.Column(
              "verbose_name", sa.String(length=250), nullable=True
          ),
      )
  
      try:
          op.create_unique_constraint(None, "dbs", ["verbose_name"])
          op.create_unique_constraint(
              None, "clusters", ["verbose_name"]
          )
      except Exception:
          logging.info(
              "Constraint not created, expected when using sqlite"
          )
  
imports: import logging
  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