Log counts to determine when SignalAccount cache goes missing

// FREEBIE

Signal/src/contact/OWSContactsManager.m

@@ -241,6 +241,7 @@ NSString *const OWSContactsManagerSignalAccountsDidChangeNotification
             NSArray<NSString *> *allKeys = [transaction allKeysInCollection:[SignalAccount collection]];
             NSMutableSet<NSString *> *orphanedKeys = [NSMutableSet setWithArray:allKeys];
 
+            DDLogInfo(@"%@ Saving %lu SignalAccounts", self.logTag, signalAccounts.count);
             for (SignalAccount *signalAccount in signalAccounts) {
                 // TODO only save the ones that changed
                 [orphanedKeys removeObject:signalAccount.uniqueId];

Signal/src/contact/SystemContactsFetcher.swift

@@ -474,6 +474,7 @@ class SystemContactsFetcher: NSObject {
                 completion(nil)
             }
 
+            Logger.info("\(self.TAG) fetched \(contacts.count) contacts.")
             let contactsHash  = HashableArray(contacts).hashValue
 
             DispatchQueue.main.async {