CreateProviderKey - creates a new provider key for the given combination of projectID and model vendor.

DeleteApplication deletes an application and all of its prompt configs by setting their deleted_at values.

DeleteProviderKey - deletes a provider key by ID and invalidates the redis cache.

DeleteUserAccount - hard deletes a user account and expunges it from firebase - conforming with GDPR.

GetOrCreateApplicationInternalAPIKeyID - gets or creates an internal token for the given application.

GetOrCreateUserAccount - return an existing user account or create a new user account.