separate home graph into it's own table

src/ORM/home-graph/home-graph.service.ts

@@ -0,0 +1,45 @@
+import { Injectable } from '@nestjs/common';
+import { InjectRepository } from '@nestjs/typeorm';
+import { Repository } from 'typeorm';
+
+import { HomeGraphEntity } from './home-graph.entity';
+
+@Injectable()
+export class HomeGraphService {
+    constructor(
+        @InjectRepository(HomeGraphEntity) private homeGraphRepository: Repository<HomeGraphEntity>
+    ) {
+
+    }
+
+    public async getLatestTime(): Promise<Date> {
+        const result = await this.homeGraphRepository.createQueryBuilder('entity')
+            .select('MAX(entity.label)', 'maxNumber')
+            .getRawOne();
+
+        if (result.maxNumber == null) {
+            return new Date(new Date().getTime() - (24 * 60 * 60 * 1000));
+        }
+
+        return new Date(parseInt(result.maxNumber));
+    }
+
+    public async save(graph: { label: number, data: number }[]) {
+        await this.homeGraphRepository.insert(graph);
+    }
+
+    public async getChartDataForSite(limit: number = 144 * 7) {
+        const records = await this.homeGraphRepository
+            .createQueryBuilder('homeGraph')
+            .orderBy('homeGraph.id', 'DESC')
+            .limit(limit)
+            .getRawMany();
+
+        return records.map(res => {
+            return {
+                label: new Date(parseInt(res.homeGraph_label)).toISOString(),
+                data: res.homeGraph_data
+            }
+        });
+    }
+}