Lena was tidying up the internal dashboard where the team tracks active server instances and noticed the ID numbers were becoming cluttered. Eva asked her to create a small helper that looks at the current list of IDs and identifies the very first positive number that isn't being used. For instance, if the dashboard shows IDs like 3, 4, -1, and 1, the tool should point out that 2 is the first gap we need to fill. This ensures the team always uses the smallest available slot before moving on to larger numbers.