Keep the predicted next release time date in backups

[aoba-seragakii]

Describe your suggested feature

Every time I restore my data again, all of the predicted dates get completely messed up. Considering that the predicted release dates adapts itself if there's an update or not, the backup data should keep this kind of information so it doesn't have to adapt itself once again. Example: I had like 200 entries to be updated tomorrow (before wiping all of the data)
After restoring the backup, it has 123 entries to be updated tomorrow and on October 4th I have 2708 entries to be updated
While before, it was almost perfectly balanced though the whole month.
This makes so the sources suffer more because of the amount that will have to update on a single day, while if the predicted dates had been backed up, it wouldn't strain them as much.
Keep in mind that I'm not talking about customized predictable dates

Other details

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