Games
Deleting moves a game to games-v2/deleted/ — Restore puts it back (under Deleted games).
Resetting a password signs everyone out of that game; they join again with the new one.
Each seat belongs to the first player account that opens it — release a seat to let a different account take it.
Deleted games (…)
Players
Accounts are made the first time someone logs in. Resetting a password logs that player out on every device.
Players fill in their own name, email and Discord ID (asked after logging in until they give an email; their profile page any time) — you can correct them here.
Email: lets the player reset a forgotten password themselves (a link by email, from the login form).
Discord: the player may announce games in the Discord forum (needs .discord.json on the server).
The ID is who gets @mentioned on their turn in a draft-only game.