1. there is a GC window configuration for retaining the relationships history itself - its default is 24h and we don't recommend making it much larger, as it will slow down access over time if too large 2. use the delete relationships API with a strict limit and back off of it if you start getting

ResourceExhausted

errors 3. datastore layer and/or backup - you can use

zed backup

to take a full copy of the system, but it is faster to have the datastore do the backup