Created a period table for date ranges and made the recipes dependent on it instead of having arbitrary date ranges. This will enable easy copying into new months.

overlord/src/app/period/period-resolver.service.spec.ts

@@ -0,0 +1,18 @@
+import { HttpClientModule } from '@angular/common/http';
+import { inject, TestBed } from '@angular/core/testing';
+import { RouterTestingModule } from '@angular/router/testing';
+
+import { PeriodResolver } from './period-resolver.service';
+
+describe('PeriodResolver', () => {
+  beforeEach(() => {
+    TestBed.configureTestingModule({
+      imports: [HttpClientModule, RouterTestingModule],
+      providers: [PeriodResolver],
+    });
+  });
+
+  it('should be created', inject([PeriodResolver], (service: PeriodResolver) => {
+    expect(service).toBeTruthy();
+  }));
+});