Update call tab to display unread missed call count.

app/src/main/java/org/thoughtcrime/securesms/database/MessageTable.kt

@@ -1324,6 +1324,20 @@ open class MessageTable(context: Context?, databaseHelper: SignalDatabase) : Dat
     return MmsReader(rawQueryWithAttachments(query, args, false, limit.toLong()))
   }
 
+  fun getUnreadMisedCallCount(): Long {
+    return readableDatabase
+      .select("COUNT(*)")
+      .from(TABLE_NAME)
+      .where(
+        "($TYPE = ? OR $TYPE = ?) AND $READ = ?",
+        MessageTypes.MISSED_AUDIO_CALL_TYPE,
+        MessageTypes.MISSED_VIDEO_CALL_TYPE,
+        0
+      )
+      .run()
+      .readToSingleLong(0L)
+  }
+
   fun getParentStoryIdForGroupReply(messageId: Long): GroupReply? {
     return readableDatabase
       .select(PARENT_STORY_ID)

app/src/main/java/org/thoughtcrime/securesms/stories/tabs/ConversationListTabRepository.kt

@@ -48,6 +48,18 @@ class ConversationListTabRepository {
   }
 
   fun getNumberOfUnseenCalls(): Observable<Long> {
-    return Observable.just(99)
+    return Observable.create { emitter ->
+      fun refresh() {
+        emitter.onNext(SignalDatabase.messages.getUnreadMisedCallCount())
+      }
+
+      val listener = DatabaseObserver.Observer {
+        refresh()
+      }
+
+      ApplicationDependencies.getDatabaseObserver().registerConversationListObserver(listener)
+      emitter.setCancellable { ApplicationDependencies.getDatabaseObserver().unregisterObserver(listener) }
+      refresh()
+    }
   }
 }