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

backend/service/feed/feedFunctions.go

@@ -0,0 +1,35 @@
+package feed
+
+import (
+	"github.com/pocketbase/dbx"
+	"github.com/pocketbase/pocketbase/daos"
+	database "htwkalender/service/db"
+	localTime "htwkalender/service/functions/time"
+	"log"
+)
+
+func ClearFeeds(db *daos.Dao, months int, clock localTime.Clock) {
+	feeds, err := database.GetAllFeeds(db)
+	if err != nil {
+		log.Println("CleanFeeds: get all feeds failed")
+		return
+	}
+	for _, feed := range feeds {
+		// if retrieved time is older than a half year delete feed
+		now := clock.Now()
+		feedRetrievedTime := feed.Retrieved.Time()
+		timeShift := now.AddDate(0, -months, 0)
+
+		if feedRetrievedTime.Before(timeShift) {
+			// delete feed
+			sqlResult, err := db.DB().Delete("feeds", dbx.NewExp("id = {:id}", dbx.Params{"id": feed.GetId()})).Execute()
+			if err != nil {
+				log.Println("CleanFeeds: delete feed " + feed.GetId() + " failed")
+				log.Println(err)
+				log.Println(sqlResult)
+			} else {
+				log.Println("CleanFeeds: delete feed " + feed.GetId() + " successful")
+			}
+		}
+	}
+}