Long-living write transaction

[mattalbus]

Hello,

I'm working on an offline-first app. Periodically, we trigger a synchronization process with an API, pulling data from 4 different endpoints, with pagination (so often multiple requests). Data are linked (by foreign keys) between these 4 endpoints. So we execute all requests, keep all data (in files currently) and perform save process after that, in a single Realm write transaction. It works but using files to keep data is far from optimal (it implies multiple JSON encoding/decoding of the same data).

I'm looking for improving this process. I could keep all data in memory and perform saving at the end, but there could be a lot of data so I consider this as risky.
Another way would be to manage a Realm transaction manually (by calling begin/commit) and wrap all requests and save data progressively. My main concerns are threading and transaction lifecycle. Is an actor isolated Realm a good solution for this use case?

Thank you!