Erasure

Quests::export($member) reads what the quests keep of a member: their contributions, their enrolments, the quests they accomplished themselves and their duels.

Quests::erase($member) deletes all of it, and returns an Erasure with the count of each:

• the member's contributions — the progress of a team or of the community goes back by what their activity brought;
• their enrolments, under whatever team;
• the quests they accomplished themselves, duels won included;
• their duels, as challenger or as the member challenged — the other side's duel goes with them.

What a team or the community accomplished stays in the journal of accomplished quests: it is not the member's, and its rewards were given. The journal of activity is erased by tilttek/activity.