How to configure logstash to read only new entries from database but not using "sql_last_start"

recording max and min values of last seen column values is something we may add in the future. This would result in the ability to run such a query where you check against something like :latest_max_<column_name>. One may only benefit from this if their ID structure is ascending in value for every new entry and not a random string. Please file an issue in the github page (https://github.com/logstash-plugins/logstash-input-jdbc) for this and we would be happy to start to tackle this feature!