fix missing images heights on month detail

Shared/Persisence/PersistenceDELETE.swift

@@ -29,4 +29,16 @@ extension PersistenceController {
         }
         try! viewContext.save()
     }
+    
+    func deleteRandomFromLast(numberOfEntries: Int) {
+        let entries = PersistenceController.shared.getData(startDate: Calendar.current.date(byAdding: .day, value: -numberOfEntries, to: Date())!,
+                                                           endDate: Date(),
+                                                           includedDays: [])
+        for entry in entries {
+            if Bool.random() {
+                viewContext.delete(entry)
+            }
+        }
+        try! viewContext.save()
+    }
 }