code: func (j *Job) Conn() *pgx.Conn {
  	j.mu.Lock()
  	defer j.mu.Unlock()
  
  	return j.conn
  }
docs: // Conn returns the pgx connection that this job is locked to. You may initiate
  // transactions on this connection or use it as you please until you call
  // Done(). At that point, this conn will be returned to the pool and it is
  // unsafe to keep using it. This function will return nil if the Job's
  // connection has already been released with Done().