journeyID / jid changing

[kickermeister]

Is there any particular reason why the journeyIDs received from https://marudor.de/api/hafas/v2/departureStationBoard are changing from time to time? Are these IDs generated by some specific pattern or logic? My plan was to collect data for a given set of journeys on a daily basis using https://marudor.de/api/hafas/v2/journeyDetails but I find it a bit tedious to query and detect the journeyIDs for the given train connections every time the data is collected...

So one day 1|396626|0|80|06052022 is the regional train BRB RB58 and the other day 1|396626|0|80|09052022 it is a completely different train with name R 2311. My assumption was that the parts in the ID before the date would be identical over the year. But they seem to change every 2-3 days.

Any ideas or help?