Say we have an application where we have users sign up for events. What we want to do is then display all events a user is not signed up for. First thought was to have a list of registered UIDs as part of Event doc and query "Give me all docs where array-does-not-contain UID". In firestore there is not array-does-not-contain so what is the recommended way one stores and queries things like this? Is this even possible with Firestore, or is there a different DB to use?
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