feat:#6 added tests with db for unused feed delete

backend/service/functions/time/mockClock.go

@@ -0,0 +1,10 @@
+package time
+
+import "time"
+
+type MockClock struct {
+	NowTime time.Time
+}
+
+func (m MockClock) Now() time.Time                       { return m.NowTime }
+func (MockClock) After(d time.Duration) <-chan time.Time { return time.After(d) }

backend/service/functions/time/realClock.go

@@ -0,0 +1,8 @@
+package time
+
+import "time"
+
+type RealClock struct{}
+
+func (RealClock) Now() time.Time                         { return time.Now() }
+func (RealClock) After(d time.Duration) <-chan time.Time { return time.After(d) }

backend/service/functions/time/time.go

@@ -0,0 +1,8 @@
+package time
+
+import "time"
+
+type Clock interface {
+	Now() time.Time
+	After(d time.Duration) <-chan time.Time
+}