Add Nightscout database size info row and alarm (#697)

Nightscout's dbsize plugin exposes the Mongo data + index size at
/api/v2/properties/dbsize. Poll it on a new 6 hour scheduler task and
surface it two ways:

- An optional "DB Size" info row showing used MiB and the percentage of
  the site's configured DBSIZE_MAX.
- A new "Nightscout Database Size" alarm that fires at or above a
  percentage threshold, defaulting to 75% to match the urgent level of
  the plugin itself.

The database fills over weeks, so the alarm defaults to day-only and
never repeats at night.

Nightscout still reports the property with a zero size when db.stats()
fails, which would read as an empty database rather than a missing
reading. Treat that as no reading, mirroring how the plugin's own pill
hides itself in that case.

LoopFollow.xcodeproj/project.pbxproj

@@ -7,10 +7,7 @@
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-		B500000000000000000000B4 /* QuickPickMealsManager.swift in Sources */ = {isa = PBXBuildFile; fileRef = B500000000000000000000B3 /* QuickPickMealsManager.swift */; };
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@@ -69,7 +66,23 @@
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@@ -93,9 +106,6 @@
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@@ -104,13 +114,7 @@
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@@ -120,7 +124,6 @@
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@@ -146,6 +149,10 @@
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-		65AC25F52ECFD5E800421360 /* Stats */ = {isa = PBXFileSystemSynchronizedRootGroup; explicitFileTypes = {}; explicitFolders = (); path = Stats; sourceTree = "<group>"; };
-		65AC26702ED245DF00421360 /* Treatments */ = {isa = PBXFileSystemSynchronizedRootGroup; explicitFileTypes = {}; explicitFolders = (); path = Treatments; sourceTree = "<group>"; };
-		DDCC3AD72DDE1790006F1C10 /* Tests */ = {isa = PBXFileSystemSynchronizedRootGroup; explicitFileTypes = {}; explicitFolders = (); path = Tests; sourceTree = "<group>"; };
+		37A4BDDE2F5B6B4A00EEB289 /* LoopFollowLAExtension */ = {
+			isa = PBXFileSystemSynchronizedRootGroup;
+			exceptions = (
+			);
+			explicitFileTypes = {
+			};
+			explicitFolders = (
+			);
+			path = LoopFollowLAExtension;
+			sourceTree = "<group>";
+		};
+		65AC25F52ECFD5E800421360 /* Stats */ = {
+			isa = PBXFileSystemSynchronizedRootGroup;
+			exceptions = (
+			);
+			explicitFileTypes = {
+			};
+			explicitFolders = (
+			);
+			path = Stats;
+			sourceTree = "<group>";
+		};
+		65AC26702ED245DF00421360 /* Treatments */ = {
+			isa = PBXFileSystemSynchronizedRootGroup;
+			exceptions = (
+			);
+			explicitFileTypes = {
+			};
+			explicitFolders = (
+			);
+			path = Treatments;
+			sourceTree = "<group>";
+		};
+		DDCC3AD72DDE1790006F1C10 /* Tests */ = {
+			isa = PBXFileSystemSynchronizedRootGroup;
+			exceptions = (
+			);
+			explicitFileTypes = {
+			};
+			explicitFolders = (
+			);
+			path = Tests;
+			sourceTree = "<group>";
+		};
 /* End PBXFileSystemSynchronizedRootGroup section */
 
 /* Begin PBXFrameworksBuildPhase section */
@@ -1016,6 +1064,24 @@
 			path = Pods;
 			sourceTree = "<group>";
 		};
+		B500000000000000000000A5 /* QuickPickBoluses */ = {
+			isa = PBXGroup;
+			children = (
+				B500000000000000000000A1 /* RemoteBolusHistoryEntry.swift */,
+				B500000000000000000000A3 /* QuickPickBolusesManager.swift */,
+			);
+			path = QuickPickBoluses;
+			sourceTree = "<group>";
+		};
+		B500000000000000000000B5 /* QuickPickMeals */ = {
+			isa = PBXGroup;
+			children = (
+				B500000000000000000000B1 /* RemoteMealHistoryEntry.swift */,
+				B500000000000000000000B3 /* QuickPickMealsManager.swift */,
+			);
+			path = QuickPickMeals;
+			sourceTree = "<group>";
+		};
 		DD02475A2DB2E8CE00FCADF6 /* AlarmCondition */ = {
 			isa = PBXGroup;
 			children = (
@@ -1043,6 +1109,7 @@
 				DD0247582DB2E89600FCADF6 /* AlarmCondition.swift */,
 				DD0650EE2DCE96FF004D3B41 /* HighBGCondition.swift */,
 				DD0650F02DCE9A9E004D3B41 /* MissedReadingCondition.swift */,
+				5D0728C33E857F13E8D9C2AD /* DBSizeCondition.swift */,
 			);
 			path = AlarmCondition;
 			sourceTree = "<group>";
@@ -1057,24 +1124,6 @@
 			path = Metric;
 			sourceTree = "<group>";
 		};
-		B500000000000000000000B5 /* QuickPickMeals */ = {
-			isa = PBXGroup;
-			children = (
-				B500000000000000000000B1 /* RemoteMealHistoryEntry.swift */,
-				B500000000000000000000B3 /* QuickPickMealsManager.swift */,
-			);
-			path = QuickPickMeals;
-			sourceTree = "<group>";
-		};
-		B500000000000000000000A5 /* QuickPickBoluses */ = {
-			isa = PBXGroup;
-			children = (
-				B500000000000000000000A1 /* RemoteBolusHistoryEntry.swift */,
-				B500000000000000000000A3 /* QuickPickBolusesManager.swift */,
-			);
-			path = QuickPickBoluses;
-			sourceTree = "<group>";
-		};
 		DD0C0C6E2C4AFFB800DBADDF /* Remote */ = {
 			isa = PBXGroup;
 			children = (
@@ -1199,6 +1248,7 @@
 				DD5334222C60ED3600062F9D /* IAge.swift */,
 				DD50C10A2F60B00000000001 /* NightscoutSocketManager.swift */,
 				DD50C10A2F60B00000000003 /* NightscoutSocketDataHandler.swift */,
+				8B81E18A2489A364AFC0A9E4 /* DBSize.swift */,
 			);
 			path = Nightscout;
 			sourceTree = "<group>";
@@ -1309,6 +1359,7 @@
 				DDC7E53E2DBD8A1600EB1127 /* LowBgAlarmEditor.swift */,
 				DD0650F22DCE9B3D004D3B41 /* MissedReadingEditor.swift */,
 				DD0650F82DCFE7BE004D3B41 /* FastDropAlarmEditor.swift */,
+				21EBF6ACF259782445DA1A7E /* DBSizeAlarmEditor.swift */,
 			);
 			path = Editors;
 			sourceTree = "<group>";
@@ -1386,6 +1437,7 @@
 				DD9ACA032D32821200415D8A /* DeviceStatusTask.swift */,
 				DDEF503E2D32754A00999A5D /* ProfileTask.swift */,
 				DDEF503B2D31BE2A00999A5D /* TaskScheduler.swift */,
+				EBE9ECA96BEA20DBD21B570D /* DBSizeTask.swift */,
 			);
 			path = Task;
 			sourceTree = "<group>";
@@ -1767,8 +1819,6 @@
 				37A4BDDE2F5B6B4A00EEB289 /* LoopFollowLAExtension */,
 			);
 			name = LoopFollowLAExtensionExtension;
-			packageProductDependencies = (
-			);
 			productName = LoopFollowLAExtensionExtension;
 			productReference = 37A4BDD92F5B6B4A00EEB289 /* LoopFollowLAExtensionExtension.appex */;
 			productType = "com.apple.product-type.app-extension";
@@ -1790,8 +1840,6 @@
 				DDCC3AD72DDE1790006F1C10 /* Tests */,
 			);
 			name = Tests;
-			packageProductDependencies = (
-			);
 			productName = Tests;
 			productReference = DDCC3AD62DDE1790006F1C10 /* Tests.xctest */;
 			productType = "com.apple.product-type.bundle.unit-test";
@@ -2419,6 +2467,10 @@
 				DDEF50422D479BAA00884336 /* LoopAPNSCarbsView.swift in Sources */,
 				DDEF50432D479BBA00884336 /* LoopAPNSBolusView.swift in Sources */,
 				DDEF50452D479BDA00884336 /* LoopAPNSRemoteView.swift in Sources */,
+				18BA6357F867577712A116EB /* DBSize.swift in Sources */,
+				9727B75402723679BD39CDE5 /* DBSizeTask.swift in Sources */,
+				E2BE9B6A33AE4F0FD750767E /* DBSizeCondition.swift in Sources */,
+				D53B243FBA69EC2A82755CDF /* DBSizeAlarmEditor.swift in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
@@ -2829,20 +2881,6 @@
 		};
 /* End XCConfigurationList section */
 
-/* Begin XCVersionGroup section */
-		FC3AE7B3249E8E0E00AAE1E0 /* LoopFollow.xcdatamodeld */ = {
-			isa = XCVersionGroup;
-			children = (
-				FC3AE7B4249E8E0E00AAE1E0 /* LoopFollow.xcdatamodel */,
-			);
-			currentVersion = FC3AE7B4249E8E0E00AAE1E0 /* LoopFollow.xcdatamodel */;
-			name = LoopFollow.xcdatamodeld;
-			path = LoopFollow/LoopFollow.xcdatamodeld;
-			sourceTree = "<group>";
-			versionGroupType = wrapper.xcdatamodel;
-		};
-/* End XCVersionGroup section */
-
 /* Begin XCRemoteSwiftPackageReference section */
 		DD50C10A2F60A00000000002 /* XCRemoteSwiftPackageReference "socket.io-client-swift" */ = {
 			isa = XCRemoteSwiftPackageReference;
@@ -2861,6 +2899,20 @@
 			productName = SocketIO;
 		};
 /* End XCSwiftPackageProductDependency section */
+
+/* Begin XCVersionGroup section */
+		FC3AE7B3249E8E0E00AAE1E0 /* LoopFollow.xcdatamodeld */ = {
+			isa = XCVersionGroup;
+			children = (
+				FC3AE7B4249E8E0E00AAE1E0 /* LoopFollow.xcdatamodel */,
+			);
+			currentVersion = FC3AE7B4249E8E0E00AAE1E0 /* LoopFollow.xcdatamodel */;
+			name = LoopFollow.xcdatamodeld;
+			path = LoopFollow/LoopFollow.xcdatamodeld;
+			sourceTree = "<group>";
+			versionGroupType = wrapper.xcdatamodel;
+		};
+/* End XCVersionGroup section */
 	};
 	rootObject = FC97880C2485969B00A7906C /* Project object */;
 }

LoopFollow/Alarm/Alarm.swift

@@ -364,6 +364,15 @@ struct Alarm: Identifiable, Codable, Equatable {
             snoozeDuration = 0
             aboveBG = 180
             belowBG = 70
+        case .dbSize:
+            /// Nightscout's own dbsize plugin warns at 60% and calls 75% urgent
+            soundFile = .wrongAnswer
+            threshold = 75
+            snoozeDuration = 1
+            /// The database fills over weeks, so there is never a reason to wake someone for it
+            activeOption = .day
+            playSoundOption = .day
+            repeatSoundOption = .day
         }
     }
 }
@@ -383,7 +392,7 @@ extension AlarmType {
         case .iob, .cob, .missedBolus, .futureCarbs, .recBolus:
             return .insulin
         case .battery, .batteryDrop, .pump, .pumpBattery, .pumpChange,
-             .sensorChange, .notLooping, .buildExpire:
+             .sensorChange, .notLooping, .buildExpire, .dbSize:
             return .device
         case .overrideStart, .overrideEnd, .tempTargetStart, .tempTargetEnd:
             return .other
@@ -410,6 +419,7 @@ extension AlarmType {
         case .sensorChange: return "sensor.tag.radiowaves.forward"
         case .notLooping: return "circle.slash"
         case .buildExpire: return "calendar.badge.exclamationmark"
+        case .dbSize: return "externaldrive.badge.exclamationmark"
         case .overrideStart: return "play.circle"
         case .overrideEnd: return "stop.circle"
         case .tempTargetStart: return "flag"
@@ -438,6 +448,7 @@ extension AlarmType {
         case .sensorChange: return "Sensor change due."
         case .notLooping: return "Loop hasn’t completed."
         case .buildExpire: return "Looping-app build expiring."
+        case .dbSize: return "Nightscout database filling up."
         case .overrideStart: return "Override just started."
         case .overrideEnd: return "Override ended."
         case .tempTargetStart: return "Temp target started."

LoopFollow/Alarm/AlarmCondition/DBSizeCondition.swift

@@ -0,0 +1,18 @@
+// LoopFollow
+// DBSizeCondition.swift
+
+import Foundation
+
+/// Fires when the Nightscout database has filled **≥ threshold percent**
+/// of the size limit configured on the site (`DBSIZE_MAX`).
+struct DBSizeCondition: AlarmCondition {
+    static let type: AlarmType = .dbSize
+    init() {}
+
+    func evaluate(alarm: Alarm, data: AlarmData, now _: Date) -> Bool {
+        guard let limitPercentage = alarm.threshold, limitPercentage > 0 else { return false }
+        guard let usedPercentage = data.dbSizePercentage else { return false }
+
+        return usedPercentage >= limitPercentage
+    }
+}

LoopFollow/Alarm/AlarmData.swift

@@ -23,4 +23,5 @@ struct AlarmData: Codable {
     let latestPumpBattery: Double?
     let batteryHistory: [DataStructs.batteryStruct]
     let recentCarbs: [CarbSample]
+    let dbSizePercentage: Double?
 }

LoopFollow/Alarm/AlarmEditing/AlarmEditor.swift

@@ -83,6 +83,7 @@ struct AlarmEditor: View {
         case .batteryDrop: BatteryDropAlarmEditor(alarm: $alarm)
         case .missedBolus: MissedBolusAlarmEditor(alarm: $alarm)
         case .futureCarbs: FutureCarbsAlarmEditor(alarm: $alarm)
+        case .dbSize: DBSizeAlarmEditor(alarm: $alarm)
         }
     }
 }

LoopFollow/Alarm/AlarmEditing/Editors/DBSizeAlarmEditor.swift

@@ -0,0 +1,33 @@
+// LoopFollow
+// DBSizeAlarmEditor.swift
+
+import SwiftUI
+
+struct DBSizeAlarmEditor: View {
+    @Binding var alarm: Alarm
+
+    var body: some View {
+        Group {
+            InfoBanner(
+                text: "This warns you when the Nightscout database has filled the percentage you choose. Nightscout measures the used space against its own DBSIZE_MAX setting, which is 496 MiB unless the site owner changed it, so the percentage is only meaningful when that setting matches the real hosting limit.",
+                alarmType: alarm.type
+            )
+
+            AlarmGeneralSection(alarm: $alarm)
+
+            AlarmStepperSection(
+                header: "Database Size",
+                footer: "This alerts you when the database reaches or exceeds this percentage of the limit configured on the Nightscout site.",
+                title: "At or Above",
+                range: 0 ... 100,
+                step: 5,
+                unitLabel: "%",
+                value: $alarm.threshold
+            )
+
+            AlarmActiveSection(alarm: $alarm)
+            AlarmAudioSection(alarm: $alarm)
+            AlarmSnoozeSection(alarm: $alarm)
+        }
+    }
+}

LoopFollow/Alarm/AlarmManager.swift

@@ -34,6 +34,7 @@ class AlarmManager {
             BatteryCondition.self,
             BatteryDropCondition.self,
             FutureCarbsCondition.self,
+            DBSizeCondition.self,
         ]
     ) {
         var dict = [AlarmType: AlarmCondition]()

LoopFollow/Alarm/AlarmType/AlarmType+Snooze.swift

@@ -7,7 +7,7 @@ extension AlarmType {
     /// What “unit” we use for snoozeDuration for this alarmType.
     var snoozeTimeUnit: TimeUnit {
         switch self {
-        case .buildExpire:
+        case .buildExpire, .dbSize:
             return .day
         case .low, .high, .fastDrop, .fastRise,
              .missedReading, .notLooping, .missedBolus,

LoopFollow/Alarm/AlarmType/AlarmType+SortDirection.swift

@@ -37,7 +37,7 @@ extension AlarmType {
             return (direction: .descending,
                     key: { $0.threshold })
 
-        case .sensorChange:
+        case .sensorChange, .dbSize:
             return (direction: .ascending,
                     key: { $0.threshold })
 

LoopFollow/Alarm/AlarmType/AlarmType+canAcknowledge.swift

@@ -12,7 +12,7 @@ extension AlarmType {
             return true
         // These are alarms without memory, if they only are acknowledged - they would alarm again immediately
         case
-            .batteryDrop, .missedReading, .notLooping, .battery, .pumpBattery, .buildExpire, .iob, .sensorChange, .pumpChange, .pump:
+            .batteryDrop, .missedReading, .notLooping, .battery, .pumpBattery, .buildExpire, .iob, .sensorChange, .pumpChange, .pump, .dbSize:
             return false
         }
     }

LoopFollow/Alarm/AlarmType/AlarmType.swift

@@ -29,6 +29,7 @@ enum AlarmType: String, CaseIterable, Codable {
     case tempTargetStart = "Temp Target Started"
     case tempTargetEnd = "Temp Target Ended"
     case buildExpire = "Looping app expiration"
+    case dbSize = "Nightscout Database Size"
 }
 
 extension AlarmType {

LoopFollow/Controllers/Nightscout/DBSize.swift

@@ -0,0 +1,62 @@
+// LoopFollow
+// DBSize.swift
+
+import Foundation
+
+/// Response shape of `/api/v2/properties/dbsize`.
+///
+/// Nightscout's `dbsize` plugin reports the Mongo `dataSize + indexSize` sum
+/// against `DBSIZE_MAX` (defaults to 496 MiB when the site admin has not set it).
+/// The key is absent when the plugin has not produced a property yet.
+struct DBSizeProperties: Codable {
+    let dbsize: DBSizeData?
+}
+
+struct DBSizeData: Codable {
+    /// Used size, in MiB.
+    let totalDataSize: Double?
+    /// Used size as a percentage of `details.maxSize`, floored by the server.
+    let dataPercentage: Int?
+    let details: Details?
+
+    struct Details: Codable {
+        /// The configured limit in MiB (`DBSIZE_MAX`).
+        let maxSize: Double?
+        let dataSize: Double?
+    }
+}
+
+extension MainViewController {
+    // NS Database Size Web Call
+    func webLoadNSDBSize() {
+        NightscoutUtils.executeRequest(eventType: .dbSize, parameters: [:]) { (result: Result<DBSizeProperties, Error>) in
+            switch result {
+            case let .success(properties):
+                self.updateDBSize(data: properties.dbsize)
+            case let .failure(error):
+                LogManager.shared.log(category: .nightscout, message: "webLoadNSDBSize, error: \(error.localizedDescription)")
+            }
+        }
+    }
+
+    // NS Database Size Response Processor
+    func updateDBSize(data: DBSizeData?) {
+        // Nightscout still reports the property when `db.stats()` failed, but with a zero
+        // size. Its own pill hides on that, so treat it as "no reading" rather than 0%.
+        guard let data = data, let usedMiB = data.totalDataSize, usedMiB > 0 else {
+            infoManager.clearInfoData(type: .dbSize)
+            Observable.shared.dbSizePercentage.set(nil)
+            return
+        }
+
+        Observable.shared.dbSizePercentage.set(data.dataPercentage.map(Double.init))
+
+        let used = Localizer.formatToLocalizedString(usedMiB, maxFractionDigits: 0, minFractionDigits: 0)
+
+        if let percentage = data.dataPercentage {
+            infoManager.updateInfoData(type: .dbSize, value: "\(used) MiB (\(percentage)%)")
+        } else {
+            infoManager.updateInfoData(type: .dbSize, value: "\(used) MiB")
+        }
+    }
+}

LoopFollow/Helpers/NightscoutUtils.swift

@@ -44,6 +44,7 @@ class NightscoutUtils {
         case iage = "Insulin Change"
         case temporaryOverride = "Temporary Override"
         case temporaryOverrideCancel = "Temporary Override Cancel"
+        case dbSize
 
         var endpoint: String {
             switch self {
@@ -57,6 +58,8 @@ class NightscoutUtils {
                 return "/api/v1/devicestatus.json"
             case .temporaryOverride, .temporaryOverrideCancel:
                 return "/api/v2/notifications/loop"
+            case .dbSize:
+                return "/api/v2/properties/dbsize"
             }
         }
     }

LoopFollow/InfoTable/InfoType.swift

@@ -4,7 +4,7 @@
 import Foundation
 
 enum InfoType: Int, CaseIterable {
-    case iob, cob, basal, override, battery, pump, pumpBattery, sage, cage, recBolus, minMax, carbsToday, autosens, profile, target, isf, carbRatio, updated, tdd, iage
+    case iob, cob, basal, override, battery, pump, pumpBattery, sage, cage, recBolus, minMax, carbsToday, autosens, profile, target, isf, carbRatio, updated, tdd, iage, dbSize
 
     var name: String {
         switch self {
@@ -28,6 +28,7 @@ enum InfoType: Int, CaseIterable {
         case .updated: return "Updated"
         case .tdd: return "TDD"
         case .iage: return "IAGE"
+        case .dbSize: return "DB Size"
         }
     }
 

LoopFollow/Settings/ImportExport/AlarmSelectionView.swift

@@ -239,6 +239,8 @@ struct AlarmSelectionRow: View {
             return "Temp Target Ended"
         case .buildExpire:
             return "Looping app expiration"
+        case .dbSize:
+            return "Nightscout Database Size"
         }
     }
 }

LoopFollow/Storage/Observable.swift

@@ -42,6 +42,7 @@ class Observable {
     var deviceRecBolus = ObservableValue<Double?>(default: nil)
     var deviceBatteryLevel = ObservableValue<Double?>(default: nil)
     var pumpBatteryLevel = ObservableValue<Double?>(default: nil)
+    var dbSizePercentage = ObservableValue<Double?>(default: nil)
     var enactedOrSuggested = ObservableValue<TimeInterval?>(default: nil)
 
     var lastSentTOTP = ObservableValue<String?>(default: nil)

LoopFollow/Task/AlarmTask.swift

@@ -52,7 +52,8 @@ extension MainViewController {
                 latestBattery: latestBattery,
                 latestPumpBattery: latestPumpBattery,
                 batteryHistory: self.deviceBatteryData,
-                recentCarbs: recentCarbs
+                recentCarbs: recentCarbs,
+                dbSizePercentage: Observable.shared.dbSizePercentage.value
             )
 
             let finalAlarmData: AlarmData

LoopFollow/Task/DBSizeTask.swift

@@ -0,0 +1,30 @@
+// LoopFollow
+// DBSizeTask.swift
+
+import Foundation
+
+extension MainViewController {
+    /// Nightscout recomputes the database size on every data load, but the value only moves
+    /// by a few MiB per day, so a slow poll is enough.
+    private static let dbSizeInterval: TimeInterval = 6 * 60 * 60
+
+    func scheduleDBSizeTask(initialDelay: TimeInterval = 5) {
+        let firstRun = Date().addingTimeInterval(initialDelay)
+
+        TaskScheduler.shared.scheduleTask(id: .dbSize, nextRun: firstRun) { [weak self] in
+            guard let self = self else { return }
+            self.dbSizeTaskAction()
+        }
+    }
+
+    func dbSizeTaskAction() {
+        guard IsNightscoutEnabled() else {
+            TaskScheduler.shared.rescheduleTask(id: .dbSize, to: Date().addingTimeInterval(60))
+            return
+        }
+
+        webLoadNSDBSize()
+
+        TaskScheduler.shared.rescheduleTask(id: .dbSize, to: Date().addingTimeInterval(Self.dbSizeInterval))
+    }
+}

LoopFollow/Task/Task.swift

@@ -12,5 +12,6 @@ extension MainViewController {
         scheduleMinAgoTask()
         scheduleCalendarTask()
         scheduleAlarmTask()
+        scheduleDBSizeTask()
     }
 }

LoopFollow/Task/TaskScheduler.swift

@@ -13,6 +13,7 @@ enum TaskID: CaseIterable {
     case calendarWrite
     case alarmCheck
     case telemetry
+    case dbSize
 }
 
 struct ScheduledTask {