Account table has no creation date information. We could add a simple boolean field `existed_in_v1` to track if it existed in v1 or not, or better a numeric field `created_on` to track block number of account creation (better to sort accounts for example). See discussion https://forum.duniter.org/t/g1nkgo-v2-support-progress-plan-and-pubkeys-address-proposal/12617 In the same way, we could have a `last_touched` field like the `lastChange` field of identity and smith.