code: def upgrade():
      
      op.create_table(
          'crawler_job',
          sa.Column('id', sa.Integer, primary_key=True, autoincrement=True),
          sa.Column('job_id', UUIDType, index=True),
          sa.Column('spider', sa.String(255), index=True),
          sa.Column('workflow', sa.String(255), index=True),
          sa.Column('results', sa.Text, nullable=True),
          sa.Column(
              'status',
              ChoiceType(JobStatus, impl=sa.String(10)),
              nullable=False
          ),
          sa.Column('logs', sa.Text, nullable=True),
          sa.Column(
              'scheduled',
              sa.DateTime,
              default=datetime.now,
              nullable=False,
              index=True
          )
      )
  
      op.create_table(
          'crawler_workflows_object',
          sa.Column('job_id', UUIDType, primary_key=True),
          sa.Column(
              'object_id',
              sa.Integer,
              sa.ForeignKey(
                  'workflows_object.id',
                  ondelete="CASCADE",
                  onupdate="CASCADE",
              ),
              primary_key=True
          )
      )
docs: Upgrade database.