ALTER TABLE users ADD COLUMN name TEXT NOT NULL DEFAULT '';

ALTER TABLE files ADD COLUMN category TEXT NOT NULL DEFAULT 'file';

CREATE TABLE notifications (
    id         UUID PRIMARY KEY,
    user_id    UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    kind       TEXT NOT NULL,
    title      TEXT NOT NULL,
    body       TEXT NOT NULL,
    created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
    read_at    TIMESTAMPTZ
);

CREATE INDEX notifications_user_id_idx ON notifications(user_id);