Fix home graph hashrate calculation (around restarts)

src/services/app.service.ts

@@ -68,16 +68,21 @@ export class AppService implements OnModuleInit {
         console.log('Updating Chart');
 
         const latestGraphUpdate = await this.homeGraphService.getLatestTime();
+        const latestGraphUpdateMilliseconds = latestGraphUpdate.getTime();
+
+        const now = new Date();
+        const diffInMilliseconds = now.getTime() - latestGraphUpdateMilliseconds;
+        const latestGraphUpdateSeconds = Math.floor(diffInMilliseconds / 1000); // Convert milliseconds to seconds
 
 
         const data = await this.dataSource.query(`
             SELECT
                 time AS label,
-                ROUND(((SUM(shares) * 4294967296) / 600)) AS data
+                ROUND(((SUM(shares) * 4294967296) / ${latestGraphUpdateSeconds})) AS data
             FROM
                 client_statistics_entity AS entry
             WHERE
-                entry.time > ${latestGraphUpdate.getTime()}
+                entry.time > ${latestGraphUpdateMilliseconds}
             GROUP BY
                 time
             ORDER BY