Erasure

The export

Leaderboards::export($member) returns what the boards hold about a member:

[
    'appearance' => ['visibility' => 'pseudonym', 'pseudonym' => 'Le Nain Gris'],
    'scores' => [['board' => 'games-month', 'period' => '2026-11', 'value' => 7, 'reached_at' => '2026-11-03T10:00:00+00:00']],
    'placings' => [['board' => 'games-month', 'period' => '2026-10', 'rank' => 2, 'value' => 7, 'reached_at' => '2026-10-02T10:00:00+00:00']],
    'leagues' => [
        'tiers' => ['weekly-xp' => 'silver'],
        'memberships' => [['board' => 'weekly-xp', 'week' => '2026-w45', 'tier' => 'bronze', 'division' => 3, 'joined_at' => '2026-11-03T10:00:00+00:00', 'movement' => 'promoted']],
    ],
]

The erasure

Leaderboards::erase($member) removes the member's contributions and scores, their lines in every snapshot, their choice of appearance, and their tiers and memberships in the leagues, and returns an Erasure counting them. The other members keep their ranks in the snapshots and their divisions; the current standings move up, since the member no longer holds a score.

leagues is empty when Leaderboards is given no Leagues.

The journal of activity is erased by tilttek/activity: a rebuild after an erasure finds nothing of the member.

Two things stay with the application. The snapshots and settlements already handed to an observer (snapshotTaken, leagueSettled) keep the member's reference wherever the application stored them. And a projection or a settlePeriod() running while the member is erased can write a score, a tier or a membership back: erase once the member's activity is erased and no settlement is running, or erase again after it.