CREATE TABLE IF NOT EXISTS auth_email_bind_requests (
    id BIGINT GENERATED BY DEFAULT AS IDENTITY PRIMARY KEY,
    user_id BIGINT NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    email VARCHAR(255) NOT NULL,
    token VARCHAR(255) UNIQUE NOT NULL,
    expires_at TIMESTAMPTZ NOT NULL,
    used_at TIMESTAMPTZ NULL,
    created_at TIMESTAMPTZ NOT NULL DEFAULT CURRENT_TIMESTAMP,

    CONSTRAINT auth_email_bind_requests_email_not_empty
        CHECK (length(trim(email)) > 0)
);

CREATE UNIQUE INDEX IF NOT EXISTS idx_auth_email_bind_requests_user_unused
    ON auth_email_bind_requests(user_id)
    WHERE used_at IS NULL;

CREATE INDEX IF NOT EXISTS idx_auth_email_bind_requests_expires_at
    ON auth_email_bind_requests(expires_at);