code: def downgrade():
      """Revert column size from 256 to 50 characters, might result in data loss."""
      # use batch_alter_table to support SQLite workaround
      with op.batch_alter_table("task_instance") as batch_op:
          batch_op.alter_column("queue", type_=sa.String(50))
  
imports: from __future__ import annotations
  import sqlalchemy
  from alembic import op
label_desc: Use image node_id 2 for calling a global function with example usage: downgrade() without return types