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Signing in with Steam used to create the account. That made a second Steam account a second person, and it made losing a Steam account lose everything attached to it — the boxes, the team, the billing history. Invert it. A user comes into existence by verifying an email address and nothing else; a Steam account hangs off a user that already exists, capped at four. Signing in with Steam resolves an account and refuses when there is none, so the accounts made before this keep working — they already have the connection this looks for — while nothing new is created behind a persona. The cap lives here rather than in the schema because a unique index cannot count the rows sharing a foreign key. The email column gains a partial unique index instead, which is the constraint that can be expressed, and the address is trimmed and lower-cased at the edge so two spellings are not two accounts.