A game or soundtrack is missing from OSTDB
OSTDB lists official releases only, so a game without an official soundtrack on a streaming service is not in the database.
If an official soundtrack exists and is missing:
Sign in at https://ostdb.net/dashboard/new
Find the game and add its official release.
Every submission is reviewed manually by a person before it appears, so it is not instant. You can follow its status on the contributor dashboard.
Questions about a specific submission: reply to this email with the game name.