-- Email is restored to NOT NULL, so phone-only accounts (email IS NULL) cannot
-- be represented and are dropped. Down is only safe when no such accounts exist.
DELETE FROM users WHERE email IS NULL;

CREATE TABLE users_old (
    id            TEXT PRIMARY KEY,
    email         TEXT NOT NULL UNIQUE,
    password_hash TEXT NOT NULL,
    name          TEXT NOT NULL,
    avatar_url    TEXT,
    preferences   TEXT NOT NULL DEFAULT '{}',
    created_at    TEXT NOT NULL DEFAULT (strftime('%Y-%m-%dT%H:%M:%fZ', 'now'))
);

INSERT INTO users_old (id, email, password_hash, name, avatar_url, preferences, created_at)
SELECT id, email, password_hash, name, avatar_url, preferences, created_at
FROM users WHERE email IS NOT NULL;

DROP TABLE users;

ALTER TABLE users_old RENAME TO users;