Transaction Manager - Support Day light Savings

Hello - I would recommend contacting the authors to make your suggestion. Perhaps Appian Support can put you in touch.

In my experience, Transaction Manager is Community-supported, so an official fix may not come. First upgrade to v2.1. If the timing still shifts, update the stored procedure to use UTC time and set schedules with a time zone name like Europe/London instead of a fixed offset, so DST is handled automatically.