feat: implement visual analytics and activity charts

shared/modules/dashboard/dashboard.service.test.ts

@@ -189,4 +189,43 @@ describe("dashboardService", () => {
             }
         });
     });
+
+    describe("getActivityAggregation", () => {
+        test("should return exactly 24 data points representing the last 24 hours", async () => {
+            const now = new Date();
+            now.setHours(now.getHours(), 0, 0, 0);
+
+            mockSelect.mockImplementationOnce(() => ({
+                // @ts-ignore
+                from: mock(() => ({
+                    where: mock(() => ({
+                        groupBy: mock(() => ({
+                            orderBy: mock(() => Promise.resolve([
+                                {
+                                    hour: now.toISOString(),
+                                    transactions: "10",
+                                    commands: "5"
+                                }
+                            ]))
+                        }))
+                    }))
+                }))
+            }));
+
+            const activity = await dashboardService.getActivityAggregation();
+
+            expect(activity).toHaveLength(24);
+
+            // Check if the current hour matches our mock
+            const currentHourData = activity.find(a => new Date(a.hour).getTime() === now.getTime());
+            expect(currentHourData).toBeDefined();
+            expect(currentHourData?.transactions).toBe(10);
+            expect(currentHourData?.commands).toBe(5);
+
+            // Check if missing hours are filled with 0
+            const otherHour = activity.find(a => new Date(a.hour).getTime() !== now.getTime());
+            expect(otherHour?.transactions).toBe(0);
+            expect(otherHour?.commands).toBe(0);
+        });
+    });
 });