treatments : delete treatments older than 90 days

deletion is done at app start up.
If user would go to treatments screen very fastly, after starting the app, then it may crash (only once). But that's probably not going to happen frequently

xdrip/Constants/ConstantsHousekeeping.swift

@@ -2,7 +2,7 @@ import Foundation
 
 enum ConstantsHousekeeping {
 
-    /// how long to keep bgReadings can calibrations
-    static let retentionPeriodBgReadingsAndCalibrationsInDays = 90.0
+    /// how long to keep bgReadings can calibrations and treatments
+    static let retentionPeriodBgReadingsAndCalibrationsAndTreatmentsInDays = 90.0
 
 }

xdrip/Utilities/HouseKeeping/HouseKeeper.swift

@@ -16,6 +16,9 @@ class HouseKeeper {
     /// CalibrationsAccessor instance
     private var calibrationsAccessor:CalibrationsAccessor
 
+    /// TreatmentEntryAccessor instance
+    private var treatmentsEntryAccessor: TreatmentEntryAccessor
+
     /// CoreDataManager instance
     private var coreDataManager: CoreDataManager
 
@@ -30,9 +33,11 @@ class HouseKeeper {
 
         self.calibrationsAccessor = CalibrationsAccessor(coreDataManager: coreDataManager)
 
+        self.treatmentsEntryAccessor = TreatmentEntryAccessor(coreDataManager: coreDataManager)
+
         self.coreDataManager = coreDataManager
 
-        self.toDate = Date(timeIntervalSinceNow: -ConstantsHousekeeping.retentionPeriodBgReadingsAndCalibrationsInDays*24*3600)
+        self.toDate = Date(timeIntervalSinceNow: -ConstantsHousekeeping.retentionPeriodBgReadingsAndCalibrationsAndTreatmentsInDays*24*3600)
 
     }
 
@@ -62,11 +67,19 @@ class HouseKeeper {
 
         }
 
+        // delete delete OldTreatments on the private managedObjectContext, asynchronously
+        managedObjectContext.perform {
+
+            // delete  delete OldTreatments
+            self.deleteOldTreatments(on: managedObjectContext)
+
+        }
+
     }
 
     // MARK: - private functions
 
-    /// deletes old readings. Readings older than ConstantsHousekeeping.retentionPeriodBgReadingsInDays will be deleted
+    /// deletes old readings. Readings older than ConstantsHousekeeping.retentionPeriodBgReadingsAndCalibrationsAndTreatmentsInDays will be deleted
     ///     - managedObjectContext : the ManagedObjectContext to use
     private func deleteOldReadings(on managedObjectContext: NSManagedObjectContext) {
 
@@ -90,7 +103,7 @@ class HouseKeeper {
 
     }
 
-    /// deletes old calibrations. Readings older than ConstantsHousekeeping.retentionPeriodBgReadingsInDays will be deleted
+    /// deletes old calibrations. Readings older than ConstantsHousekeeping.retentionPeriodBgReadingsAndCalibrationsAndTreatmentsInDays will be deleted
     private func deleteOldCalibrations(on managedObjectContext: NSManagedObjectContext) {
 
         // get old calibrations to delete
@@ -120,5 +133,31 @@ class HouseKeeper {
         }
 
     }
+
+    /// deletes old treatments. Treatments older than ConstantsHousekeeping.retentionPeriodBgReadingsAndCalibrationsAndTreatmentsInDays will be deleted
+    ///     - managedObjectContext : the ManagedObjectContext to use
+    private func deleteOldTreatments(on managedObjectContext: NSManagedObjectContext) {
+
+        // get old treatments to delete
+        let oldTreatments = self.treatmentsEntryAccessor.getTreatments(fromDate: nil, toDate: Date(timeIntervalSinceNow: -ConstantsHousekeeping.retentionPeriodBgReadingsAndCalibrationsAndTreatmentsInDays*24*3600), on: managedObjectContext)
+
+        if oldTreatments.count > 0 {
+
+            trace("in deleteOldTreatments, number of treatments to delete : %{public}@, to date = %{public}@", log: self.log, category: ConstantsLog.categoryHouseKeeper, type: .info, oldTreatments.count.description, self.toDate.description(with: .current))
+
+        }
+
+        // delete them
+        for oldTreatment in oldTreatments {
+
+            treatmentsEntryAccessor.delete(treatmentEntry: oldTreatment, on: managedObjectContext)
+
+            coreDataManager.saveChanges()
+
+        }
+
+    }
+
+
 
 }