Alert once then disable alert

There are no equivalent settings for alerts that can be created from saved custom scans. There is only one way to limit your scan results to once per ticker for each trading day. That is to write the code so that your condition is only true once per trading session. So your true/false condition for the scan must be true one time during the day and then be false for the rest of the day. There is no blanket solution for this. There is no setting for this. The code itself must be written specifically to avoid repeating signals per ticker per day.