feat: add activity heatmap to user dialog for online frequency visualization (#1198)

src/services/database/feed.js

@@ -572,6 +572,18 @@ const feed = {
             args
         );
         return feedDatabase;
+    },
+
+    async getOnlineFrequencyData(userId) {
+        const data = [];
+        await sqliteService.execute(
+            (dbRow) => {
+                data.push(dbRow[0]);
+            },
+            `SELECT created_at FROM ${dbVars.userPrefix}_feed_online_offline WHERE type = 'Online' AND user_id = @userId ORDER BY created_at`,
+            { '@userId': userId }
+        );
+        return data;
     }
 };