Hi @KaiB,
My understanding of the retention period is that it is a period that starts after each event that is sent to AudienceStream for that specific visitor/profile.
If a profile hasn't received any events within the profile retention period it is removed from AudienceStream.
The retention period is applicable to the storage of the entire profile not the individual profile's attributes
The attribute for "last purchase date" will not change for a visitor if no rules are triggered for it.
Event attributes are "forgotten" after the event is over.
Visit attributes are "forgotten"after the visit is over (with a small time window)
Visitor attributes are "forgotten" after the period since the last received event for that visitor was longer than the visitor retention period.
As to your second question, wether this is 2 calender months or a preset amount of days, i'm not sure.
All the best,
Tim
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