Allow deletion of measurements

TempTrack/Storage/TemperatureStorage.swift

@@ -83,6 +83,10 @@ final class TemperatureStorage: ObservableObject {
         String(format: "%08d.bin", index)
     }
     
+    private func fileUrl(for dateIndex: Int) -> URL {
+        storageFolder.appendingPathComponent(fileName(for: dateIndex))
+    }
+    
     private func fileUrl(for fileName: String) -> URL {
         storageFolder.appendingPathComponent(fileName)
     }
@@ -148,6 +152,21 @@ final class TemperatureStorage: ObservableObject {
         updateLastMeasurements(measurements)
     }
     
+    func removeMeasurements(for dateIndex: Int) {
+        let fileUrl = fileUrl(for: dateIndex)
+        guard fm.fileExists(atPath: fileUrl.path) else {
+            print("No measurements for \(fileUrl.lastPathComponent)")
+            return
+        }
+        do {
+            try fm.removeItem(at: fileUrl)
+            dailyMeasurementCounts = dailyMeasurementCounts.filter { $0.dateIndex != dateIndex }
+            recentMeasurements = recentMeasurements.filter { $0.date.dateIndex != dateIndex }
+        } catch {
+            print("Failed to delete \(fileUrl.lastPathComponent): \(error)")
+        }
+    }
+    
     /**
      - Returns: The number of new points
      */
@@ -245,7 +264,7 @@ final class TemperatureStorage: ObservableObject {
 private extension Array where Element == TemperatureMeasurement {
     
     @discardableResult
-    mutating func insert(_ measurement: TemperatureMeasurement) -> Bool {
+    mutating func insertIntoSorted(_ measurement: TemperatureMeasurement) -> Bool {
         guard !contains(measurement) else {
             return false
         }