Improve chart performance (#7360)

* wip

* wip

* wip

* wip

* wip

* Update chart.ts

* wip

* Improve server performance

* wip

* wip

src/services/chart/charts/classes/test.ts

@@ -21,6 +21,17 @@ export default class TestChart extends Chart<TestLog> {
 		};
 	}
 
+	@autobind
+	protected aggregate(logs: TestLog[]): TestLog {
+		return {
+			foo: {
+				total: logs[0].foo.total,
+				inc: logs.reduce((a, b) => a + b.foo.inc, 0),
+				dec: logs.reduce((a, b) => a + b.foo.dec, 0),
+			},
+		};
+	}
+
 	@autobind
 	protected async fetchActual(): Promise<DeepPartial<TestLog>> {
 		return {