badge

type Store interface {
	// Increment atomically adds delta to a user's badge count and returns the
	// resulting value. A user with no badge yet is treated as zero. delta is
	// typically 1 per unread-eligible message, or a larger amount when several
	// have been coalesced.
	Increment(ctx context.Context, userID *commonpb.UserId, delta uint64) (uint64, error)

	// Get returns a user's current badge count, or zero if the user has none.
	Get(ctx context.Context, userID *commonpb.UserId) (uint64, error)

	// Reset sets a user's badge count back to zero, e.g. when the app is opened.
	Reset(ctx context.Context, userID *commonpb.UserId) error
}