I love sqlx and type checked queries but always found it annoying to duplicate a bunch of queries vs using the dynamic query builder (which isn't type checked). Using Option and NULLs seems to improve things though!

// Postgres version
let ids = sqlx::query_as!(
    Uuid,
    "SELECT id FROM users \
     WHERE ($1::timestamptz IS NULL OR updated_at < $1) \
       AND ($2::timestamptz IS NULL OR updated_at > $2) \
       AND ($3::boolean IS NULL OR is_guest = $3)",
    updated_before_option,
    updated_after_option,
    is_guest_option,
    )
    .fetch_all(&pool)
    .await;

via