update top header graph view when custom color changes

code cleanup

Shared/Persisence/PersistenceHelper.swift

@@ -8,10 +8,6 @@
 import CoreData
 
 extension PersistenceController {
-    private var childContext: NSManagedObjectContext {
-        return NSManagedObjectContext(concurrencyType: .mainQueueConcurrencyType)
-    }
-    
     public func randomEntries(count: Int) -> [MoodEntry] {
         var entries = [MoodEntry]()
         
@@ -63,19 +59,24 @@ extension PersistenceController {
     }
     
     func populateTestData() {
-        for idx in 1..<120 {
-            let newItem = MoodEntry(context: viewContext)
-            newItem.timestamp = Date()
-            newItem.moodValue = Int16(Mood.allValues.randomElement()!.rawValue)
-            newItem.canEdit = true
-            newItem.canDelete = true
-            
-            let date = Calendar.current.date(byAdding: .day, value: -idx, to: Date())!
-            newItem.forDate = date
-            newItem.weekDay = Int16(Calendar.current.component(.weekday, from: date))
-        }
         do {
+            self.clearDB()
             try viewContext.save()
+            
+            for idx in 1..<120 {
+                let newItem = MoodEntry(context: viewContext)
+                newItem.timestamp = Date()
+                newItem.moodValue = Int16(Mood.allValues.randomElement()!.rawValue)
+                newItem.canEdit = true
+                newItem.canDelete = true
+                
+                let date = Calendar.current.date(byAdding: .day, value: -idx, to: Date())!
+                newItem.forDate = date
+                newItem.weekDay = Int16(Calendar.current.component(.weekday, from: date))
+            }
+            
+            try viewContext.save()
+            runDataListeners()
         } catch {
             // Replace this implementation with code to handle the error appropriately.
             // fatalError() causes the application to generate a crash log and terminate. You should not use this function in a shipping application, although it may be useful during development.