Question
Some modifications were done with the subscription, but no records appear in the "SubscriptionArc" table of the pba database. Why?
Answer
The described behaviour is by-design, "Subscription" table has UnArch modifier and does not store history of changes to "SubscriptionArc". There are requests with ids #PFR-967 ("Add Subscription data logging to SubscriptionArc table in the most important actions") and #PBA-46198 ("Querying SubscriptionArc for recent changes has no results") to implement it.