code: def delete_tag_from_job(user, job_id, tag_id):
      
  
      _JJT = models.JOIN_JOBS_TAGS
      job = v1_utils.verify_existence_and_get(job_id, _TABLE)
      if not user.is_in_team(job['team_id']):
          raise dci_exc.Unauthorized()
      v1_utils.verify_existence_and_get(tag_id, models.TAGS)
  
      query = _JJT.delete().where(sql.and_(_JJT.c.tag_id == tag_id,
                                           _JJT.c.job_id == job_id))
  
      try:
          flask.g.db_conn.execute(query)
      except sa_exc.IntegrityError:
          raise dci_exc.DCICreationConflict('tag', 'tag_id')
  
      return flask.Response(None, 204, content_type='application/json')
docs: Delete a tag from a job.