Add limiters and database changes

user/types.go

@@ -86,6 +86,8 @@ type Tier struct {
 	MessageLimit             int64         // Daily message limit
 	MessageExpiryDuration    time.Duration // Cache duration for messages
 	EmailLimit               int64         // Daily email limit
+	SMSLimit                 int64         // Daily SMS limit
+	CallLimit                int64         // Daily phone call limit
 	ReservationLimit         int64         // Number of topic reservations allowed by user
 	AttachmentFileSizeLimit  int64         // Max file size per file (bytes)
 	AttachmentTotalSizeLimit int64         // Total file size for all files of this user (bytes)
@@ -131,6 +133,8 @@ type NotificationPrefs struct {
 type Stats struct {
 	Messages int64
 	Emails   int64
+	SMS      int64
+	Calls    int64
 }
 
 // Billing is a struct holding a user's billing information