refactor: model rule options as a per-kind sum type

Replace the wide BlockingRule/RuleDraft "god struct" — where every option
existed for every kind — with a RuleConfiguration sum type that carries only
the options each kind actually has:

  .schedule(ScheduleConfig: window + selectionMode + blockAdultContent)
  .timeLimit(TimeLimitConfig: dailyLimitMinutes)
  .openLimit(OpenLimitConfig: maxOpens)

Name, days, Hard Mode, app list, and pause stay common to all kinds. This
makes illegal states unrepresentable: Block / Allow Only and Block Adult
Content are now structurally Schedule-only.

User-visible behavior change: the Time Limit and Open Limit editors no longer
offer a Block Adult Content toggle, and their detail sheets drop the "Adult
websites" row — those never made sense for a usage budget. Limit rules are
always Block and never engage the web-content filter.

BlockingRule keeps flat columns as raw persistence behind a computed
`configuration` bridge (lowest SwiftData risk; the cross-process RuleSnapshot
wire format and the Screen Time extensions are untouched). Logic, the editors,
and the detail sheet all switch on the sum type.

Spec (§1, §3.5/§3.6, §5.2) updated first; tests reworked to the new API with
new structural-guarantee unit tests and a UI test asserting the Time Limit
editor/detail omit adult content. Full suite green (180 tests).

Co-Authored-By: Claude <noreply@anthropic.com>

OpenAppLock.xcodeproj/project.pbxproj

@@ -13,6 +13,20 @@
 /* End PBXBuildFile section */
 
 /* Begin PBXContainerItemProxy section */
+		20A7EDDE2E47B7CF0097608D /* PBXContainerItemProxy */ = {
+			isa = PBXContainerItemProxy;
+			containerPortal = 20A7EDC62E47B7CD0097608D /* Project object */;
+			proxyType = 1;
+			remoteGlobalIDString = 20A7EDCD2E47B7CD0097608D;
+			remoteInfo = OpenAppLock;
+		};
+		20A7EDE82E47B7CF0097608D /* PBXContainerItemProxy */ = {
+			isa = PBXContainerItemProxy;
+			containerPortal = 20A7EDC62E47B7CD0097608D /* Project object */;
+			proxyType = 1;
+			remoteGlobalIDString = 20A7EDCD2E47B7CD0097608D;
+			remoteInfo = OpenAppLock;
+		};
 		E20000000000000000000001 /* PBXContainerItemProxy */ = {
 			isa = PBXContainerItemProxy;
 			containerPortal = 20A7EDC62E47B7CD0097608D /* Project object */;
@@ -34,22 +48,24 @@
 			remoteGlobalIDString = C10000000000000000000003;
 			remoteInfo = OpenAppLockShieldAction;
 		};
-		20A7EDDE2E47B7CF0097608D /* PBXContainerItemProxy */ = {
-			isa = PBXContainerItemProxy;
-			containerPortal = 20A7EDC62E47B7CD0097608D /* Project object */;
-			proxyType = 1;
-			remoteGlobalIDString = 20A7EDCD2E47B7CD0097608D;
-			remoteInfo = OpenAppLock;
-		};
-		20A7EDE82E47B7CF0097608D /* PBXContainerItemProxy */ = {
-			isa = PBXContainerItemProxy;
-			containerPortal = 20A7EDC62E47B7CD0097608D /* Project object */;
-			proxyType = 1;
-			remoteGlobalIDString = 20A7EDCD2E47B7CD0097608D;
-			remoteInfo = OpenAppLock;
-		};
 /* End PBXContainerItemProxy section */
 
+/* Begin PBXCopyFilesBuildPhase section */
+		E10000000000000000000001 /* Embed Foundation Extensions */ = {
+			isa = PBXCopyFilesBuildPhase;
+			buildActionMask = 2147483647;
+			dstPath = "";
+			dstSubfolderSpec = 13;
+			files = (
+				F10000000000000000000001 /* OpenAppLockMonitor.appex in Embed Foundation Extensions */,
+				F10000000000000000000002 /* OpenAppLockShieldConfig.appex in Embed Foundation Extensions */,
+				F10000000000000000000003 /* OpenAppLockShieldAction.appex in Embed Foundation Extensions */,
+			);
+			name = "Embed Foundation Extensions";
+			runOnlyForDeploymentPostprocessing = 0;
+		};
+/* End PBXCopyFilesBuildPhase section */
+
 /* Begin PBXFileReference section */
 		20A7EDCE2E47B7CD0097608D /* OpenAppLock.app */ = {isa = PBXFileReference; explicitFileType = wrapper.application; includeInIndex = 0; path = OpenAppLock.app; sourceTree = BUILT_PRODUCTS_DIR; };
 		20A7EDDD2E47B7CF0097608D /* OpenAppLockTests.xctest */ = {isa = PBXFileReference; explicitFileType = wrapper.cfbundle; includeInIndex = 0; path = OpenAppLockTests.xctest; sourceTree = BUILT_PRODUCTS_DIR; };
@@ -59,6 +75,30 @@
 		B10000000000000000000003 /* OpenAppLockShieldAction.appex */ = {isa = PBXFileReference; explicitFileType = "wrapper.app-extension"; includeInIndex = 0; path = OpenAppLockShieldAction.appex; sourceTree = BUILT_PRODUCTS_DIR; };
 /* End PBXFileReference section */
 
+/* Begin PBXFileSystemSynchronizedBuildFileExceptionSet section */
+		AB00000000000000000000B1 /* Exceptions for "OpenAppLockMonitor" folder in "OpenAppLockMonitor" target */ = {
+			isa = PBXFileSystemSynchronizedBuildFileExceptionSet;
+			membershipExceptions = (
+				Info.plist,
+			);
+			target = C10000000000000000000001 /* OpenAppLockMonitor */;
+		};
+		AB00000000000000000000B2 /* Exceptions for "OpenAppLockShieldConfig" folder in "OpenAppLockShieldConfig" target */ = {
+			isa = PBXFileSystemSynchronizedBuildFileExceptionSet;
+			membershipExceptions = (
+				Info.plist,
+			);
+			target = C10000000000000000000002 /* OpenAppLockShieldConfig */;
+		};
+		AB00000000000000000000B3 /* Exceptions for "OpenAppLockShieldAction" folder in "OpenAppLockShieldAction" target */ = {
+			isa = PBXFileSystemSynchronizedBuildFileExceptionSet;
+			membershipExceptions = (
+				Info.plist,
+			);
+			target = C10000000000000000000003 /* OpenAppLockShieldAction */;
+		};
+/* End PBXFileSystemSynchronizedBuildFileExceptionSet section */
+
 /* Begin PBXFileSystemSynchronizedRootGroup section */
 		20A7EDD02E47B7CD0097608D /* OpenAppLock */ = {
 			isa = PBXFileSystemSynchronizedRootGroup;
@@ -106,46 +146,6 @@
 		};
 /* End PBXFileSystemSynchronizedRootGroup section */
 
-/* Begin PBXFileSystemSynchronizedBuildFileExceptionSet section */
-		AB00000000000000000000B1 /* Exceptions for "OpenAppLockMonitor" folder in "OpenAppLockMonitor" target */ = {
-			isa = PBXFileSystemSynchronizedBuildFileExceptionSet;
-			membershipExceptions = (
-				Info.plist,
-			);
-			target = C10000000000000000000001 /* OpenAppLockMonitor */;
-		};
-		AB00000000000000000000B2 /* Exceptions for "OpenAppLockShieldConfig" folder in "OpenAppLockShieldConfig" target */ = {
-			isa = PBXFileSystemSynchronizedBuildFileExceptionSet;
-			membershipExceptions = (
-				Info.plist,
-			);
-			target = C10000000000000000000002 /* OpenAppLockShieldConfig */;
-		};
-		AB00000000000000000000B3 /* Exceptions for "OpenAppLockShieldAction" folder in "OpenAppLockShieldAction" target */ = {
-			isa = PBXFileSystemSynchronizedBuildFileExceptionSet;
-			membershipExceptions = (
-				Info.plist,
-			);
-			target = C10000000000000000000003 /* OpenAppLockShieldAction */;
-		};
-/* End PBXFileSystemSynchronizedBuildFileExceptionSet section */
-
-/* Begin PBXCopyFilesBuildPhase section */
-		E10000000000000000000001 /* Embed Foundation Extensions */ = {
-			isa = PBXCopyFilesBuildPhase;
-			buildActionMask = 2147483647;
-			dstPath = "";
-			dstSubfolderSpec = 13;
-			files = (
-				F10000000000000000000001 /* OpenAppLockMonitor.appex in Embed Foundation Extensions */,
-				F10000000000000000000002 /* OpenAppLockShieldConfig.appex in Embed Foundation Extensions */,
-				F10000000000000000000003 /* OpenAppLockShieldAction.appex in Embed Foundation Extensions */,
-			);
-			name = "Embed Foundation Extensions";
-			runOnlyForDeploymentPostprocessing = 0;
-		};
-/* End PBXCopyFilesBuildPhase section */
-
 /* Begin PBXFrameworksBuildPhase section */
 		20A7EDCB2E47B7CD0097608D /* Frameworks */ = {
 			isa = PBXFrameworksBuildPhase;
@@ -308,8 +308,8 @@
 			dependencies = (
 			);
 			fileSystemSynchronizedGroups = (
-				AA00000000000000000000A2 /* OpenAppLockMonitor */,
 				AA00000000000000000000A1 /* Shared */,
+				AA00000000000000000000A2 /* OpenAppLockMonitor */,
 			);
 			name = OpenAppLockMonitor;
 			packageProductDependencies = (
@@ -331,8 +331,8 @@
 			dependencies = (
 			);
 			fileSystemSynchronizedGroups = (
-				AA00000000000000000000A3 /* OpenAppLockShieldConfig */,
 				AA00000000000000000000A1 /* Shared */,
+				AA00000000000000000000A3 /* OpenAppLockShieldConfig */,
 			);
 			name = OpenAppLockShieldConfig;
 			packageProductDependencies = (
@@ -354,8 +354,8 @@
 			dependencies = (
 			);
 			fileSystemSynchronizedGroups = (
-				AA00000000000000000000A4 /* OpenAppLockShieldAction */,
 				AA00000000000000000000A1 /* Shared */,
+				AA00000000000000000000A4 /* OpenAppLockShieldAction */,
 			);
 			name = OpenAppLockShieldAction;
 			packageProductDependencies = (

OpenAppLock/Logic/RuleStatus.swift

@@ -89,10 +89,10 @@ extension BlockingRule {
     /// use the plain status label.
     func statusLabel(for status: RuleStatus, relativeTo now: Date) -> String {
         if case .upcoming = status {
-            switch kind {
+            switch configuration {
             case .schedule: break
-            case .timeLimit: return "\(dailyLimitMinutes)m / day"
+            case .timeLimit(let config): return "\(config.dailyLimitMinutes)m / day"
-            case .openLimit: return "\(maxOpens) opens / day"
+            case .openLimit(let config): return "\(config.maxOpens) opens / day"
             }
         }
         return status.label(relativeTo: now)
@@ -109,10 +109,10 @@ extension BlockingRule {
     /// Whether the given usage exhausts this rule's daily budget.
     /// Always false for schedule rules — they block by the clock.
     func limitReached(given usage: RuleUsage) -> Bool {
-        switch kind {
+        switch configuration {
         case .schedule: false
-        case .timeLimit: usage.minutesUsed >= dailyLimitMinutes
+        case .timeLimit(let config): usage.minutesUsed >= config.dailyLimitMinutes
-        case .openLimit: usage.opensUsed >= maxOpens
+        case .openLimit(let config): usage.opensUsed >= config.maxOpens
         }
     }
 }

OpenAppLock/Logic/UsageDisplay.swift

@@ -10,14 +10,14 @@ import Foundation
 enum UsageDisplay {
     /// "18m of 45m used today" / "2 of 5 opens today".
     static func subtitle(for rule: BlockingRule, usage: RuleUsage) -> String {
-        switch rule.kind {
+        switch rule.configuration {
         case .schedule:
             ""
-        case .timeLimit:
+        case .timeLimit(let config):
-            "\(min(usage.minutesUsed, rule.dailyLimitMinutes))m of "
+            "\(min(usage.minutesUsed, config.dailyLimitMinutes))m of "
-                + "\(rule.dailyLimitMinutes)m used today"
+                + "\(config.dailyLimitMinutes)m used today"
-        case .openLimit:
+        case .openLimit(let config):
-            "\(min(usage.opensUsed, rule.maxOpens)) of \(rule.maxOpens) opens today"
+            "\(min(usage.opensUsed, config.maxOpens)) of \(config.maxOpens) opens today"
         }
     }
 
@@ -27,13 +27,13 @@ enum UsageDisplay {
         guard !rule.limitReached(given: usage) else {
             return isPaused ? "Unblocked until tomorrow" : "Blocked until tomorrow"
         }
-        switch rule.kind {
+        switch rule.configuration {
         case .schedule:
             return ""
-        case .timeLimit:
+        case .timeLimit(let config):
-            return "\(rule.dailyLimitMinutes - usage.minutesUsed)m left"
+            return "\(config.dailyLimitMinutes - usage.minutesUsed)m left"
-        case .openLimit:
+        case .openLimit(let config):
-            let remaining = rule.maxOpens - usage.opensUsed
+            let remaining = config.maxOpens - usage.opensUsed
             return remaining == 1 ? "1 open left" : "\(remaining) opens left"
         }
     }

OpenAppLock/Models/BlockingRule.swift

@@ -8,6 +8,13 @@ import SwiftData
 
 /// A recurring screen-time blocking rule.
 ///
+/// The kind-specific options live in a `RuleConfiguration` sum type, exposed
+/// through the computed `configuration` bridge below. The raw per-kind columns
+/// (`startMinutes`, `selectionModeRaw`, `dailyLimitMinutes`, …) are persistence
+/// detail: they are read and written *only* via `configuration`, which keeps a
+/// rule from ever carrying another kind's options (e.g. a Time Limit rule can
+/// never hold Block Adult Content — see `applyConfiguration`).
+///
 /// Times are stored as minutes from midnight so the schedule repeats cleanly and
 /// is independent of time zones at creation. A window whose end is at or before
 /// its start (e.g. 22:00 → 06:00) crosses midnight into the following day.
@@ -19,10 +26,6 @@ final class BlockingRule {
     var isEnabled: Bool
     /// Hard block: while the rule is active it cannot be disabled, edited, or unblocked.
     var hardMode: Bool
-    /// Engage Screen Time's adult-website filter while this rule is blocking.
-    /// Inline default so existing stores migrate cleanly.
-    var blockAdultContent: Bool = false
-    var selectionModeRaw: String
     /// The reusable app list this rule blocks (or allows, in Allow Only mode).
     ///
     /// Deliberately not an `init` parameter: SwiftData relationship properties
@@ -36,51 +39,99 @@ final class BlockingRule {
     /// Legacy denormalized count; superseded by `appList?.selectionCount`.
     var selectionCount: Int
     var dayNumbers: [Int]
-    var startMinutes: Int
-    var endMinutes: Int
-    /// Daily usage budget for `.timeLimit` rules.
-    var dailyLimitMinutes: Int
-    /// Daily open budget for `.openLimit` rules.
-    var maxOpens: Int
     /// When set, the rule's current window is suspended (user tapped Unblock).
     /// Cleared automatically once the date passes; never set while Hard Mode is active.
     var pausedUntil: Date?
     var createdAt: Date
 
+    // MARK: Raw per-kind storage (access via `configuration`)
+
+    /// Schedule-window bounds, minutes from midnight. Meaningful for `.schedule`.
+    var startMinutes: Int
+    var endMinutes: Int
+    /// Schedule-only; forced to `.block` for limit kinds by `applyConfiguration`.
+    var selectionModeRaw: String
+    /// Schedule-only; forced to `false` for limit kinds by `applyConfiguration`.
+    var blockAdultContent: Bool
+    /// Daily usage budget for `.timeLimit` rules.
+    var dailyLimitMinutes: Int
+    /// Daily open budget for `.openLimit` rules.
+    var maxOpens: Int
+
     init(
         id: UUID = UUID(),
         name: String,
-        kind: RuleKind = .schedule,
+        configuration: RuleConfiguration = .schedule(ScheduleConfig()),
         isEnabled: Bool = true,
         hardMode: Bool = false,
-        blockAdultContent: Bool = false,
-        selectionMode: SelectionMode = .block,
-        selectionData: Data? = nil,
-        selectionCount: Int = 0,
         days: Set<Weekday> = Weekday.weekdays,
-        startMinutes: Int = 9 * 60,
-        endMinutes: Int = 17 * 60,
-        dailyLimitMinutes: Int = 45,
-        maxOpens: Int = 5,
         pausedUntil: Date? = nil,
         createdAt: Date = .now
     ) {
         self.id = id
         self.name = name
-        self.kindRaw = kind.rawValue
         self.isEnabled = isEnabled
         self.hardMode = hardMode
-        self.blockAdultContent = blockAdultContent
+        self.appList = nil
-        self.selectionModeRaw = selectionMode.rawValue
+        self.selectionData = nil
-        self.selectionData = selectionData
+        self.selectionCount = 0
-        self.selectionCount = selectionCount
         self.dayNumbers = days.map(\.rawValue).sorted()
-        self.startMinutes = startMinutes
-        self.endMinutes = endMinutes
-        self.dailyLimitMinutes = dailyLimitMinutes
-        self.maxOpens = maxOpens
         self.pausedUntil = pausedUntil
         self.createdAt = createdAt
+        // Raw per-kind columns start at the reference defaults, then the
+        // configuration overwrites the ones that apply to its kind.
+        self.kindRaw = configuration.kind.rawValue
+        self.startMinutes = 9 * 60
+        self.endMinutes = 17 * 60
+        self.selectionModeRaw = SelectionMode.block.rawValue
+        self.blockAdultContent = false
+        self.dailyLimitMinutes = 45
+        self.maxOpens = 5
+        applyConfiguration(configuration)
+    }
+
+    /// The kind-specific options of this rule. Reading assembles the sum type
+    /// from the raw columns; writing routes through `applyConfiguration`, which
+    /// keeps the schedule-only options off limit rules.
+    var configuration: RuleConfiguration {
+        get {
+            switch kind {
+            case .schedule:
+                .schedule(
+                    ScheduleConfig(
+                        startMinutes: startMinutes,
+                        endMinutes: endMinutes,
+                        selectionMode: selectionMode,
+                        blockAdultContent: blockAdultContent))
+            case .timeLimit:
+                .timeLimit(TimeLimitConfig(dailyLimitMinutes: dailyLimitMinutes))
+            case .openLimit:
+                .openLimit(OpenLimitConfig(maxOpens: maxOpens))
+            }
+        }
+        set { applyConfiguration(newValue) }
+    }
+
+    /// Writes a configuration onto the raw columns. Limit kinds explicitly
+    /// reset the Schedule-only options so a rule can never carry Block / Allow
+    /// Only or Block Adult Content unless it is a Schedule rule.
+    private func applyConfiguration(_ configuration: RuleConfiguration) {
+        kindRaw = configuration.kind.rawValue
+        switch configuration {
+        case .schedule(let config):
+            startMinutes = config.startMinutes
+            endMinutes = config.endMinutes
+            selectionModeRaw = config.selectionMode.rawValue
+            blockAdultContent = config.blockAdultContent
+        case .timeLimit(let config):
+            dailyLimitMinutes = config.dailyLimitMinutes
+            selectionModeRaw = SelectionMode.block.rawValue
+            blockAdultContent = false
+        case .openLimit(let config):
+            maxOpens = config.maxOpens
+            selectionModeRaw = SelectionMode.block.rawValue
+            blockAdultContent = false
+        }
     }
 
     var kind: RuleKind {
@@ -88,9 +139,9 @@ final class BlockingRule {
         set { kindRaw = newValue.rawValue }
     }
 
+    /// How this rule interprets its app list. Always `.block` for limit kinds.
     var selectionMode: SelectionMode {
-        get { SelectionMode(rawValue: selectionModeRaw) ?? .block }
+        SelectionMode(rawValue: selectionModeRaw) ?? .block
-        set { selectionModeRaw = newValue.rawValue }
     }
 
     var days: Set<Weekday> {

OpenAppLock/Models/RuleDraft.swift

@@ -9,58 +9,46 @@ import SwiftData
 /// Value-type working copy of a rule used by the editors, so cancelling an
 /// edit never touches the persisted model. Hashable so it can drive
 /// `navigationDestination(item:)`.
+///
+/// The kind-specific options live in `configuration`, so each editor branch
+/// only ever sees the options that belong to its kind (the Schedule editor
+/// gets Block/Allow-Only and Block Adult Content; the limit editors do not).
 struct RuleDraft: Hashable {
     var name: String
-    var kind: RuleKind
     var days: Set<Weekday>
-    var startMinutes: Int
-    var endMinutes: Int
-    var dailyLimitMinutes: Int
-    var maxOpens: Int
     var hardMode: Bool
-    var blockAdultContent: Bool
-    var selectionMode: SelectionMode
     /// Reference to the persisted list the rule will use. App lists are
     /// managed (created/edited) directly by the picker, so the draft only
     /// carries the pointer.
     var appList: AppList?
+    var configuration: RuleConfiguration
+
+    var kind: RuleKind { configuration.kind }
 
     /// A fresh draft for a new rule of the given kind, using the reference
     /// app's defaults (9–5 weekdays schedule, 45m/day, 5 opens/day).
     init(kind: RuleKind) {
         self.name = kind.defaultRuleName
-        self.kind = kind
         self.days = Weekday.weekdays
-        self.startMinutes = 9 * 60
-        self.endMinutes = 17 * 60
-        self.dailyLimitMinutes = 45
-        self.maxOpens = 5
         self.hardMode = false
-        self.blockAdultContent = false
-        self.selectionMode = .block
         self.appList = nil
+        self.configuration = .default(for: kind)
     }
 
     init(rule: BlockingRule) {
         self.name = rule.name
-        self.kind = rule.kind
         self.days = rule.days
-        self.startMinutes = rule.startMinutes
-        self.endMinutes = rule.endMinutes
-        self.dailyLimitMinutes = rule.dailyLimitMinutes
-        self.maxOpens = rule.maxOpens
         self.hardMode = rule.hardMode
-        self.blockAdultContent = rule.blockAdultContent
-        self.selectionMode = rule.selectionMode
         self.appList = rule.appList
+        self.configuration = rule.configuration
     }
 
     init(preset: RulePreset) {
         self.init(kind: .schedule)
         self.name = preset.name
         self.days = preset.days
-        self.startMinutes = preset.startMinutes
+        self.configuration = .schedule(
-        self.endMinutes = preset.endMinutes
+            ScheduleConfig(startMinutes: preset.startMinutes, endMinutes: preset.endMinutes))
     }
 
     /// Writes the draft back onto a rule. The rule (and the chosen list) must
@@ -68,15 +56,9 @@ struct RuleDraft: Hashable {
     /// assigned between managed models (see `BlockingRule.appList`).
     func apply(to rule: BlockingRule) {
         rule.name = name
-        rule.kind = kind
         rule.days = days
-        rule.startMinutes = startMinutes
-        rule.endMinutes = endMinutes
-        rule.dailyLimitMinutes = dailyLimitMinutes
-        rule.maxOpens = maxOpens
         rule.hardMode = hardMode
-        rule.blockAdultContent = blockAdultContent
+        rule.configuration = configuration
-        rule.selectionMode = selectionMode
         if rule.appList !== appList {
             rule.appList = appList
         }
@@ -87,26 +69,47 @@ struct RuleDraft: Hashable {
     /// ever written on a managed model.
     @discardableResult
     func insertRule(into context: ModelContext) -> BlockingRule {
-        let rule = BlockingRule(name: name, kind: kind)
+        let rule = BlockingRule(name: name, configuration: configuration)
         context.insert(rule)
         apply(to: rule)
         return rule
     }
 
-    /// Trims the name (falling back to the kind's default when it is empty)
+    /// Trims the name, falling back to the kind's default when it is empty.
-    /// and forces Block mode for time- and open-limit rules — Allow Only is a
+    /// (Block / Allow Only no longer needs sanitizing: the sum type makes it
-    /// schedule-rule concept.
+    /// impossible for a limit draft to carry a selection mode at all.)
     func sanitized() -> RuleDraft {
         var copy = self
         let trimmed = name.trimmingCharacters(in: .whitespaces)
         copy.name = trimmed.isEmpty ? kind.defaultRuleName : trimmed
-        if kind != .schedule {
-            copy.selectionMode = .block
-        }
         return copy
     }
 
     var schedule: RuleSchedule {
-        RuleSchedule(startMinutes: startMinutes, endMinutes: endMinutes, days: days)
+        RuleSchedule(
+            startMinutes: scheduleConfig.startMinutes,
+            endMinutes: scheduleConfig.endMinutes,
+            days: days)
+    }
+}
+
+extension RuleDraft {
+    /// Typed projections of the active configuration, used to bind editor
+    /// controls. The getter returns kind defaults when the draft is a
+    /// different kind; each editor only reads the projection for its own kind,
+    /// and writing through it repackages the configuration to that kind.
+    var scheduleConfig: ScheduleConfig {
+        get { configuration.scheduleConfig ?? ScheduleConfig() }
+        set { configuration = .schedule(newValue) }
+    }
+
+    var timeLimitConfig: TimeLimitConfig {
+        get { configuration.timeLimitConfig ?? TimeLimitConfig() }
+        set { configuration = .timeLimit(newValue) }
+    }
+
+    var openLimitConfig: OpenLimitConfig {
+        get { configuration.openLimitConfig ?? OpenLimitConfig() }
+        set { configuration = .openLimit(newValue) }
     }
 }

OpenAppLock/Services/RuleEnforcer.swift

@@ -56,8 +56,10 @@ final class RuleEnforcer {
             shields.applyShield(
                 ruleID: rule.id,
                 selectionData: rule.appList?.selectionData,
-                // Allow Only is a schedule-rule concept; limit blocks always Block.
+                // Allow Only and Block Adult Content are Schedule-only options;
-                mode: rule.kind == .schedule ? rule.selectionMode : .block,
+                // the model already forces .block / false on limit rules, so we
+                // can forward the rule's values directly.
+                mode: rule.selectionMode,
                 blockAdultContent: rule.blockAdultContent
             )
         }

OpenAppLock/Services/SampleRules.swift

@@ -35,13 +35,17 @@ enum SampleRules {
             ]
         case .limits:
             let timeKeeper = BlockingRule(
-                name: "Time Keeper", kind: .timeLimit, days: Weekday.everyDay,
+                name: "Time Keeper",
-                dailyLimitMinutes: 45)
+                configuration: .timeLimit(TimeLimitConfig(dailyLimitMinutes: 45)),
+                days: Weekday.everyDay)
             let gateKeeper = BlockingRule(
-                name: "Gate Keeper", kind: .openLimit, days: Weekday.everyDay, maxOpens: 5)
+                name: "Gate Keeper",
+                configuration: .openLimit(OpenLimitConfig(maxOpens: 5)),
+                days: Weekday.everyDay)
             let doomScroll = BlockingRule(
-                name: "Doom Scroll", kind: .timeLimit, days: Weekday.everyDay,
+                name: "Doom Scroll",
-                dailyLimitMinutes: 30)
+                configuration: .timeLimit(TimeLimitConfig(dailyLimitMinutes: 30)),
+                days: Weekday.everyDay)
             usage?.usageByRule[timeKeeper.id] = RuleUsage(minutesUsed: 18)
             usage?.usageByRule[gateKeeper.id] = RuleUsage(opensUsed: 2)
             usage?.usageByRule[doomScroll.id] = RuleUsage(minutesUsed: 30)
@@ -65,10 +69,9 @@ enum SampleRules {
         let end = min(24 * 60 - 1, nowMinutes + 6 * 60)
         return BlockingRule(
             name: name,
+            configuration: .schedule(ScheduleConfig(startMinutes: start, endMinutes: end)),
             hardMode: hardMode,
-            days: Weekday.everyDay,
+            days: Weekday.everyDay
-            startMinutes: start,
-            endMinutes: end
         )
     }
 
@@ -82,9 +85,8 @@ enum SampleRules {
         let end = (start + 8 * 60) % (24 * 60)
         return BlockingRule(
             name: name,
-            days: Weekday.everyDay,
+            configuration: .schedule(ScheduleConfig(startMinutes: start, endMinutes: end)),
-            startMinutes: start,
+            days: Weekday.everyDay
-            endMinutes: end
         )
     }
 

OpenAppLock/Views/Rules/RuleDetailSheet.swift

@@ -100,26 +100,25 @@ struct RuleDetailSheet: View {
 
     @ViewBuilder
     private var detailRows: some View {
-        switch rule.kind {
+        switch rule.configuration {
-        case .schedule:
+        case .schedule(let config):
             row("During this time", rule.schedule.timeRangeLabel)
             row("On these days", rule.days.summary)
-            row(rule.selectionMode.displayName, appCountLabel)
+            row(config.selectionMode.displayName, appCountLabel)
-            row("Adult websites", rule.blockAdultContent ? "Blocked" : "Allowed")
+            // Adult websites is a Schedule-only option (see spec §1).
+            row("Adult websites", config.blockAdultContent ? "Blocked" : "Allowed")
             row("Unblocks allowed", rule.hardMode ? "No" : "Yes")
-        case .timeLimit:
+        case .timeLimit(let config):
             row("When I use", appCountLabel)
-            row("For this long", "\(rule.dailyLimitMinutes)m daily")
+            row("For this long", "\(config.dailyLimitMinutes)m daily")
             row("On these days", rule.days.summary)
             row("Then block until", "Tomorrow")
-            row("Adult websites", rule.blockAdultContent ? "Blocked" : "Allowed")
             row("Unblocks allowed", rule.hardMode ? "No" : "Yes")
-        case .openLimit:
+        case .openLimit(let config):
             row("When I open", appCountLabel)
-            row("More than", "\(rule.maxOpens) opens daily")
+            row("More than", "\(config.maxOpens) opens daily")
             row("On these days", rule.days.summary)
             row("Then block until", "Tomorrow")
-            row("Adult websites", rule.blockAdultContent ? "Blocked" : "Allowed")
             row("Unblocks allowed", rule.hardMode ? "No" : "Yes")
         }
     }

OpenAppLock/Views/Rules/RuleEditorView.swift

@@ -97,13 +97,13 @@ struct RuleEditorView: View {
             Section {
                 DatePicker(
                     "From",
-                    selection: timeBinding($draft.startMinutes),
+                    selection: timeBinding($draft.scheduleConfig.startMinutes),
                     displayedComponents: .hourAndMinute
                 )
                 .accessibilityIdentifier("fromTimePicker")
                 DatePicker(
                     "To",
-                    selection: timeBinding($draft.endMinutes),
+                    selection: timeBinding($draft.scheduleConfig.endMinutes),
                     displayedComponents: .hourAndMinute
                 )
                 .accessibilityIdentifier("toTimePicker")
@@ -112,7 +112,7 @@ struct RuleEditorView: View {
             }
             daysSection
             Section {
-                Picker("Mode", selection: $draft.selectionMode) {
+                Picker("Mode", selection: $draft.scheduleConfig.selectionMode) {
                     ForEach(SelectionMode.allCases, id: \.self) { mode in
                         Text(mode.displayName).tag(mode)
                     }
@@ -121,10 +121,14 @@ struct RuleEditorView: View {
                 .accessibilityIdentifier("selectionModePicker")
                 appListRow
             } header: {
-                Text(draft.selectionMode == .block ? "Apps are blocked" : "Only these apps are allowed")
+                Text(draft.scheduleConfig.selectionMode == .block
+                    ? "Apps are blocked" : "Only these apps are allowed")
                     .textCase(nil)
             }
-            toggleSections
+            hardModeSection
+            // Block Adult Content is a Schedule-only option: a usage budget
+            // does not pair with a web-content filter (see spec §1).
+            adultContentSection
         case .timeLimit:
             Section {
                 appListRow
@@ -133,17 +137,23 @@ struct RuleEditorView: View {
             }
             Section {
                 budgetRow(
-                    value: "\(draft.dailyLimitMinutes)m",
+                    value: "\(draft.timeLimitConfig.dailyLimitMinutes)m",
                     stepperID: "dailyLimitStepper",
-                    onIncrement: { draft.dailyLimitMinutes = min(240, draft.dailyLimitMinutes + 15) },
+                    onIncrement: {
-                    onDecrement: { draft.dailyLimitMinutes = max(15, draft.dailyLimitMinutes - 15) }
+                        draft.timeLimitConfig.dailyLimitMinutes =
+                            min(240, draft.timeLimitConfig.dailyLimitMinutes + 15)
+                    },
+                    onDecrement: {
+                        draft.timeLimitConfig.dailyLimitMinutes =
+                            max(15, draft.timeLimitConfig.dailyLimitMinutes - 15)
+                    }
                 )
             } header: {
                 Text("For this long").textCase(nil)
             }
             daysSection
             blockUntilSection
-            toggleSections
+            hardModeSection
         case .openLimit:
             Section {
                 appListRow
@@ -152,17 +162,21 @@ struct RuleEditorView: View {
             }
             Section {
                 budgetRow(
-                    value: "\(draft.maxOpens) opens",
+                    value: "\(draft.openLimitConfig.maxOpens) opens",
                     stepperID: "maxOpensStepper",
-                    onIncrement: { draft.maxOpens = min(50, draft.maxOpens + 1) },
+                    onIncrement: {
-                    onDecrement: { draft.maxOpens = max(1, draft.maxOpens - 1) }
+                        draft.openLimitConfig.maxOpens = min(50, draft.openLimitConfig.maxOpens + 1)
+                    },
+                    onDecrement: {
+                        draft.openLimitConfig.maxOpens = max(1, draft.openLimitConfig.maxOpens - 1)
+                    }
                 )
             } header: {
                 Text("More than").textCase(nil)
             }
             daysSection
             blockUntilSection
-            toggleSections
+            hardModeSection
         }
     }
 
@@ -186,8 +200,8 @@ struct RuleEditorView: View {
         }
     }
 
-    @ViewBuilder
+    /// Hard Mode applies to every kind.
-    private var toggleSections: some View {
+    private var hardModeSection: some View {
         Section {
             HStack {
                 Text("Hard Mode")
@@ -199,11 +213,15 @@ struct RuleEditorView: View {
         } footer: {
             Text("No unblocks allowed while the rule is blocking.")
         }
+    }
+
+    /// Schedule-only: filter adult websites while the rule's window is active.
+    private var adultContentSection: some View {
         Section {
             HStack {
                 Text("Block Adult Content")
                 Spacer()
-                Toggle("", isOn: $draft.blockAdultContent)
+                Toggle("", isOn: $draft.scheduleConfig.blockAdultContent)
                     .labelsHidden()
                     .accessibilityIdentifier("adultContentToggle")
             }

OpenAppLockTests/AppListTests.swift

@@ -86,10 +86,21 @@ struct AppListModelTests {
 @MainActor
 @Suite("Legacy selection → AppList migration")
 struct AppListMigrationTests {
+    /// Simulates a rule decoded from a pre-app-list store: a plain rule whose
+    /// legacy inline-selection columns are populated.
+    private func legacyRule(name: String, selectionData: Data, selectionCount: Int) -> BlockingRule {
+        let rule = BlockingRule(name: name)
+        rule.selectionData = selectionData
+        rule.selectionCount = selectionCount
+        return rule
+    }
+
     @Test("Rules with legacy inline selections get a list named after them")
     func createsListsFromLegacySelections() throws {
         let context = try makeInMemoryContext()
-        let rule = BlockingRule(name: "Work Time", selectionData: Data([1]), selectionCount: 3)
+        let rule = BlockingRule(name: "Work Time")
+        rule.selectionData = Data([1])
+        rule.selectionCount = 3
         context.insert(rule)
         try context.save()
 
@@ -108,9 +119,9 @@ struct AppListMigrationTests {
     @Test("Rules with identical selections share one list")
     func sharesListForIdenticalSelections() throws {
         let context = try makeInMemoryContext()
-        let first = BlockingRule(name: "Work Time", selectionData: Data([7]), selectionCount: 2)
+        let first = legacyRule(name: "Work Time", selectionData: Data([7]), selectionCount: 2)
-        let second = BlockingRule(name: "Sleep", selectionData: Data([7]), selectionCount: 2)
+        let second = legacyRule(name: "Sleep", selectionData: Data([7]), selectionCount: 2)
-        let different = BlockingRule(name: "Gym", selectionData: Data([9]), selectionCount: 1)
+        let different = legacyRule(name: "Gym", selectionData: Data([9]), selectionCount: 1)
         context.insert(first)
         context.insert(second)
         context.insert(different)
@@ -127,7 +138,7 @@ struct AppListMigrationTests {
     @Test("Migration is idempotent and skips selection-less rules")
     func idempotentAndSkipsEmpty() throws {
         let context = try makeInMemoryContext()
-        let legacy = BlockingRule(name: "Work Time", selectionData: Data([1]), selectionCount: 1)
+        let legacy = legacyRule(name: "Work Time", selectionData: Data([1]), selectionCount: 1)
         let empty = BlockingRule(name: "No Apps")
         context.insert(legacy)
         context.insert(empty)
@@ -163,22 +174,24 @@ struct AppListDraftTests {
         #expect(other.name == "Other")
     }
 
-    @Test("Sanitizing forces Block mode for time- and open-limit rules")
+    @Test("Limit drafts structurally cannot carry a selection mode")
-    func sanitizedForcesBlockForLimitKinds() {
+    func limitDraftsHaveNoSelectionMode() {
-        var timeDraft = RuleDraft(kind: .timeLimit)
+        // The sum type makes Block / Allow Only a Schedule-only option: a limit
-        timeDraft.selectionMode = .allowOnly
+        // draft's configuration has no selection mode to force back to Block.
-        #expect(timeDraft.sanitized().selectionMode == .block)
+        #expect(RuleDraft(kind: .timeLimit).configuration.scheduleConfig == nil)
+        #expect(RuleDraft(kind: .openLimit).configuration.scheduleConfig == nil)
 
-        var openDraft = RuleDraft(kind: .openLimit)
+        // And the rule built from a limit draft is always Block.
-        openDraft.selectionMode = .allowOnly
+        let rule = BlockingRule(
-        #expect(openDraft.sanitized().selectionMode == .block)
+            name: "Time Keeper", configuration: RuleDraft(kind: .timeLimit).configuration)
+        #expect(rule.selectionMode == .block)
     }
 
-    @Test("Sanitizing keeps Allow Only on schedule rules")
+    @Test("Allow Only survives on schedule rules")
-    func sanitizedKeepsAllowOnlyForSchedule() {
+    func keepsAllowOnlyForSchedule() {
         var draft = RuleDraft(kind: .schedule)
-        draft.selectionMode = .allowOnly
+        draft.scheduleConfig.selectionMode = .allowOnly
-        #expect(draft.sanitized().selectionMode == .allowOnly)
+        #expect(draft.sanitized().scheduleConfig.selectionMode == .allowOnly)
     }
 }
 

OpenAppLockTests/RuleConfigurationTests.swift

@@ -0,0 +1,44 @@
+//
+//  RuleConfigurationTests.swift
+//  OpenAppLockTests
+//
+
+import Foundation
+import Testing
+
+@testable import OpenAppLock
+
+@MainActor
+@Suite("RuleConfiguration sum type")
+struct RuleConfigurationTests {
+    @Test("Each case reports its kind")
+    func kindDerivation() {
+        #expect(RuleConfiguration.schedule(ScheduleConfig()).kind == .schedule)
+        #expect(RuleConfiguration.timeLimit(TimeLimitConfig()).kind == .timeLimit)
+        #expect(RuleConfiguration.openLimit(OpenLimitConfig()).kind == .openLimit)
+    }
+
+    @Test("Defaults match the reference app's new-rule defaults")
+    func defaults() {
+        let schedule = RuleConfiguration.default(for: .schedule).scheduleConfig
+        #expect(schedule?.startMinutes == 9 * 60)
+        #expect(schedule?.endMinutes == 17 * 60)
+        #expect(schedule?.selectionMode == .block)
+        #expect(schedule?.blockAdultContent == false)
+
+        #expect(RuleConfiguration.default(for: .timeLimit).timeLimitConfig?.dailyLimitMinutes == 45)
+        #expect(RuleConfiguration.default(for: .openLimit).openLimitConfig?.maxOpens == 5)
+    }
+
+    @Test("Typed projections only unwrap the matching case")
+    func projections() {
+        let schedule = RuleConfiguration.schedule(ScheduleConfig(blockAdultContent: true))
+        #expect(schedule.scheduleConfig?.blockAdultContent == true)
+        #expect(schedule.timeLimitConfig == nil)
+        #expect(schedule.openLimitConfig == nil)
+
+        let openLimit = RuleConfiguration.openLimit(OpenLimitConfig(maxOpens: 7))
+        #expect(openLimit.openLimitConfig?.maxOpens == 7)
+        #expect(openLimit.scheduleConfig == nil)
+    }
+}

OpenAppLockTests/RuleEnforcerTests.swift

@@ -54,7 +54,7 @@ struct RuleEnforcerTests {
     func skipsTimeLimitRules() {
         let shields = MockShieldController()
         let enforcer = RuleEnforcer(shields: shields)
-        let rule = BlockingRule(name: "Time Keeper", kind: .timeLimit)
+        let rule = BlockingRule(name: "Time Keeper", configuration: .timeLimit(TimeLimitConfig()))
 
         enforcer.refresh(rules: [rule], at: mondayDuringWork, calendar: utc)
 
@@ -104,7 +104,8 @@ struct RuleEnforcerTests {
     func forwardsSelectionMode() {
         let shields = MockShieldController()
         let enforcer = RuleEnforcer(shields: shields)
-        let rule = BlockingRule(name: "Focus", selectionMode: .allowOnly)
+        let rule = BlockingRule(
+            name: "Focus", configuration: .schedule(ScheduleConfig(selectionMode: .allowOnly)))
 
         enforcer.refresh(rules: [rule], at: mondayDuringWork, calendar: utc)
 
@@ -115,7 +116,8 @@ struct RuleEnforcerTests {
     func forwardsAdultContentFlag() {
         let shields = MockShieldController()
         let enforcer = RuleEnforcer(shields: shields)
-        let filtered = BlockingRule(name: "Clean Mode", blockAdultContent: true)
+        let filtered = BlockingRule(
+            name: "Clean Mode", configuration: .schedule(ScheduleConfig(blockAdultContent: true)))
         let unfiltered = BlockingRule(name: "Plain")
 
         enforcer.refresh(rules: [filtered, unfiltered], at: mondayDuringWork, calendar: utc)

OpenAppLockTests/RuleModelTests.swift

@@ -36,8 +36,9 @@ struct RuleModelTests {
 
     @Test("Kind and selection mode survive raw storage, with safe fallbacks")
     func enumRoundTrip() {
-        let rule = BlockingRule(name: "Test", kind: .openLimit, selectionMode: .allowOnly)
+        let rule = BlockingRule(
-        #expect(rule.kind == .openLimit)
+            name: "Test", configuration: .schedule(ScheduleConfig(selectionMode: .allowOnly)))
+        #expect(rule.kind == .schedule)
         #expect(rule.selectionMode == .allowOnly)
         rule.kindRaw = "garbage"
         rule.selectionModeRaw = "garbage"
@@ -45,12 +46,43 @@ struct RuleModelTests {
         #expect(rule.selectionMode == .block)
     }
 
+    @Test("Limit kinds can never carry Schedule-only options")
+    func limitKindsHaveNoScheduleOptions() {
+        let timeLimit = BlockingRule(
+            name: "Time Keeper", configuration: .timeLimit(TimeLimitConfig(dailyLimitMinutes: 30)))
+        #expect(timeLimit.kind == .timeLimit)
+        #expect(timeLimit.selectionMode == .block)
+        #expect(!timeLimit.blockAdultContent)
+        #expect(timeLimit.dailyLimitMinutes == 30)
+
+        let openLimit = BlockingRule(
+            name: "Gate Keeper", configuration: .openLimit(OpenLimitConfig(maxOpens: 3)))
+        #expect(openLimit.kind == .openLimit)
+        #expect(openLimit.selectionMode == .block)
+        #expect(!openLimit.blockAdultContent)
+        #expect(openLimit.maxOpens == 3)
+    }
+
+    @Test("Configuration round-trips through the model's raw storage")
+    func configurationRoundTrip() {
+        let config = RuleConfiguration.schedule(
+            ScheduleConfig(
+                startMinutes: 22 * 60, endMinutes: 6 * 60,
+                selectionMode: .allowOnly, blockAdultContent: true))
+        let rule = BlockingRule(name: "Deep Sleep", configuration: config)
+        #expect(rule.configuration == config)
+        #expect(rule.startMinutes == 22 * 60)
+        #expect(rule.blockAdultContent)
+    }
+
     @Test("Rules persist and fetch through SwiftData")
     func persistence() throws {
         let context = try makeInMemoryContext()
         let rule = BlockingRule(
-            name: "Deep Sleep", hardMode: true,
+            name: "Deep Sleep",
-            days: Weekday.everyDay, startMinutes: 22 * 60, endMinutes: 6 * 60
+            configuration: .schedule(ScheduleConfig(startMinutes: 22 * 60, endMinutes: 6 * 60)),
+            hardMode: true,
+            days: Weekday.everyDay
         )
         context.insert(rule)
         try context.save()
@@ -73,7 +105,7 @@ struct RuleDraftTests {
         let draft = RuleDraft(kind: .timeLimit)
         #expect(draft.name == "Time Keeper")
         #expect(draft.kind == .timeLimit)
-        #expect(draft.dailyLimitMinutes == 45)
+        #expect(draft.timeLimitConfig.dailyLimitMinutes == 45)
         #expect(draft.days == Weekday.weekdays)
         #expect(!draft.hardMode)
     }
@@ -87,18 +119,32 @@ struct RuleDraftTests {
         var draft = RuleDraft(kind: .schedule)
         draft.name = "Locked In"
         draft.days = Weekday.everyDay
-        draft.startMinutes = 22 * 60
+        draft.configuration = .schedule(
-        draft.endMinutes = 6 * 60
+            ScheduleConfig(
+                startMinutes: 22 * 60, endMinutes: 6 * 60,
+                selectionMode: .allowOnly, blockAdultContent: true))
         draft.hardMode = true
-        draft.blockAdultContent = true
-        draft.selectionMode = .allowOnly
         draft.appList = list
 
         let rule = draft.insertRule(into: context)
         #expect(rule.blockAdultContent)
+        #expect(rule.selectionMode == .allowOnly)
         #expect(RuleDraft(rule: rule) == draft)
     }
 
+    @Test("A limit draft cannot carry Schedule-only options")
+    func limitDraftHasNoScheduleOptions() {
+        let draft = RuleDraft(kind: .openLimit)
+        // The configuration is an open-limit case, so there is structurally no
+        // selection mode or adult-content flag to set.
+        #expect(draft.configuration.scheduleConfig == nil)
+        #expect(draft.openLimitConfig.maxOpens == 5)
+
+        let rule = BlockingRule(name: draft.name, configuration: draft.configuration)
+        #expect(!rule.blockAdultContent)
+        #expect(rule.selectionMode == .block)
+    }
+
     @Test("Applying a draft updates an existing rule")
     func applyToExisting() throws {
         let context = try makeInMemoryContext()
@@ -135,8 +181,8 @@ struct RuleDraftTests {
         )
         let draft = RuleDraft(preset: preset)
         #expect(draft.name == "Deep Sleep")
-        #expect(draft.startMinutes == 22 * 60)
+        #expect(draft.scheduleConfig.startMinutes == 22 * 60)
-        #expect(draft.endMinutes == 6 * 60)
+        #expect(draft.scheduleConfig.endMinutes == 6 * 60)
         #expect(draft.kind == .schedule)
     }
 }

OpenAppLockTests/RuleStatusTests.swift

@@ -63,7 +63,7 @@ struct RuleStatusTests {
 
     @Test("Time-limit rules are never schedule-active")
     func timeLimitNeverActive() {
-        let rule = BlockingRule(name: "Time Keeper", kind: .timeLimit)
+        let rule = BlockingRule(name: "Time Keeper", configuration: .timeLimit(TimeLimitConfig()))
         let status = rule.status(at: date(2025, 1, 6, 10, 0), calendar: utc)
         #expect(!status.isActive)
         if case .upcoming = status {} else {
@@ -116,7 +116,8 @@ struct RuleStatusTests {
     /// daily budget — never the vestigial 09:00 start as "Starts in 22h".
     @Test("Idle time-limit rule shows its daily budget, not a clock countdown")
     func timeLimitDisplayLabel() {
-        let rule = BlockingRule(name: "Time Keeper", kind: .timeLimit, dailyLimitMinutes: 15)
+        let rule = BlockingRule(
+            name: "Time Keeper", configuration: .timeLimit(TimeLimitConfig(dailyLimitMinutes: 15)))
         let now = date(2025, 1, 6, 11, 38) // past the vestigial 09:00 window start
         let status = rule.status(at: now, calendar: utc)
         #expect(rule.statusLabel(for: status, relativeTo: now) == "15m / day")
@@ -124,7 +125,8 @@ struct RuleStatusTests {
 
     @Test("Idle open-limit rule shows its daily opens budget")
     func openLimitDisplayLabel() {
-        let rule = BlockingRule(name: "Gate Keeper", kind: .openLimit, maxOpens: 5)
+        let rule = BlockingRule(
+            name: "Gate Keeper", configuration: .openLimit(OpenLimitConfig(maxOpens: 5)))
         let now = date(2025, 1, 6, 11, 38)
         let status = rule.status(at: now, calendar: utc)
         #expect(rule.statusLabel(for: status, relativeTo: now) == "5 opens / day")
@@ -140,7 +142,8 @@ struct RuleStatusTests {
 
     @Test("A spent time-limit budget still shows the blocked countdown")
     func timeLimitBlockingDisplayLabel() {
-        let rule = BlockingRule(name: "Time Keeper", kind: .timeLimit, dailyLimitMinutes: 15)
+        let rule = BlockingRule(
+            name: "Time Keeper", configuration: .timeLimit(TimeLimitConfig(dailyLimitMinutes: 15)))
         let now = date(2025, 1, 6, 11, 38)
         let status = rule.status(at: now, calendar: utc, usage: RuleUsage(minutesUsed: 15))
         #expect(status.isActive)

OpenAppLockTests/SchedulingTests.swift

@@ -41,7 +41,9 @@ struct RuleSnapshotTests {
         let context = try makeInMemoryContext()
         let list = AppList(name: "Distractions", selectionData: Data([9]), selectionCount: 1)
         let rule = BlockingRule(
-            name: "Gate Keeper", kind: .openLimit, days: Weekday.weekends, maxOpens: 3)
+            name: "Gate Keeper",
+            configuration: .openLimit(OpenLimitConfig(maxOpens: 3)),
+            days: Weekday.weekends)
         context.insert(list)
         context.insert(rule)
         rule.appList = list
@@ -135,7 +137,8 @@ struct RuleSchedulerTests {
     private func limitRule(kind: RuleKind, name: String) throws -> BlockingRule {
         let context = try makeInMemoryContext()
         let list = AppList(name: "Apps", selectionData: Data([1]), selectionCount: 1)
-        let rule = BlockingRule(name: name, kind: kind, days: Weekday.everyDay)
+        let rule = BlockingRule(
+            name: name, configuration: .default(for: kind), days: Weekday.everyDay)
         context.insert(list)
         context.insert(rule)
         rule.appList = list
@@ -148,7 +151,9 @@ struct RuleSchedulerTests {
     ) throws -> BlockingRule {
         let context = try makeInMemoryContext()
         let rule = BlockingRule(
-            name: name, kind: .schedule, days: days, startMinutes: start, endMinutes: end)
+            name: name,
+            configuration: .schedule(ScheduleConfig(startMinutes: start, endMinutes: end)),
+            days: days)
         context.insert(rule)
         if withApps {
             let list = AppList(name: "Apps", selectionData: Data([7]), selectionCount: 1)
@@ -186,7 +191,7 @@ struct RuleSchedulerTests {
         let (scheduler, monitor, _) = makeScheduler()
         let context = try makeInMemoryContext()
         let applessSchedule = BlockingRule(name: "Work Time")
-        let applessLimit = BlockingRule(name: "Empty", kind: .timeLimit)
+        let applessLimit = BlockingRule(name: "Empty", configuration: .timeLimit(TimeLimitConfig()))
         context.insert(applessSchedule)
         context.insert(applessLimit)
 

OpenAppLockTests/UsageTests.swift

@@ -79,13 +79,17 @@ struct UsageStatusTests {
     let mondayMorning = date(2025, 1, 6, 10, 0)
 
     private func timeLimitRule(limit: Int = 45) -> BlockingRule {
-        BlockingRule(name: "Time Keeper", kind: .timeLimit, days: Weekday.everyDay,
+        BlockingRule(
-                     dailyLimitMinutes: limit)
+            name: "Time Keeper",
+            configuration: .timeLimit(TimeLimitConfig(dailyLimitMinutes: limit)),
+            days: Weekday.everyDay)
     }
 
     private func openLimitRule(maxOpens: Int = 5) -> BlockingRule {
-        BlockingRule(name: "Gate Keeper", kind: .openLimit, days: Weekday.everyDay,
+        BlockingRule(
-                     maxOpens: maxOpens)
+            name: "Gate Keeper",
+            configuration: .openLimit(OpenLimitConfig(maxOpens: maxOpens)),
+            days: Weekday.everyDay)
     }
 
     @Test("A time-limit rule with budget left is not active")
@@ -153,13 +157,17 @@ struct UsageEnforcementTests {
         let ledger = MockUsageLedger()
         let enforcer = RuleEnforcer(shields: shields, usage: ledger)
         let rule = BlockingRule(
-            name: "Time Keeper", kind: .timeLimit, days: Weekday.everyDay, dailyLimitMinutes: 45)
+            name: "Time Keeper",
+            configuration: .timeLimit(TimeLimitConfig(dailyLimitMinutes: 45)),
+            days: Weekday.everyDay)
         ledger.usageByRule[rule.id] = RuleUsage(minutesUsed: 45)
 
         enforcer.refresh(rules: [rule], at: mondayMorning, calendar: utc)
 
         #expect(shields.shieldedRuleIDs == [rule.id])
         #expect(shields.appliedModes[rule.id] == .block)
+        // Limit rules never engage the adult-content filter (Schedule-only).
+        #expect(shields.appliedAdultContentFlags[rule.id] == false)
     }
 
     @Test("A limit rule with budget left is not shielded")
@@ -168,7 +176,9 @@ struct UsageEnforcementTests {
         let ledger = MockUsageLedger()
         let enforcer = RuleEnforcer(shields: shields, usage: ledger)
         let rule = BlockingRule(
-            name: "Gate Keeper", kind: .openLimit, days: Weekday.everyDay, maxOpens: 5)
+            name: "Gate Keeper",
+            configuration: .openLimit(OpenLimitConfig(maxOpens: 5)),
+            days: Weekday.everyDay)
         ledger.usageByRule[rule.id] = RuleUsage(opensUsed: 2)
 
         enforcer.refresh(rules: [rule], at: mondayMorning, calendar: utc)
@@ -181,9 +191,13 @@ struct UsageEnforcementTests {
 @Suite("Usage display strings")
 struct UsageDisplayTests {
     let timeRule = BlockingRule(
-        name: "Time Keeper", kind: .timeLimit, days: Weekday.everyDay, dailyLimitMinutes: 45)
+        name: "Time Keeper",
+        configuration: .timeLimit(TimeLimitConfig(dailyLimitMinutes: 45)),
+        days: Weekday.everyDay)
     let openRule = BlockingRule(
-        name: "Gate Keeper", kind: .openLimit, days: Weekday.everyDay, maxOpens: 5)
+        name: "Gate Keeper",
+        configuration: .openLimit(OpenLimitConfig(maxOpens: 5)),
+        days: Weekday.everyDay)
 
     @Test("Time-limit rows show minutes used and remaining")
     func timeLimitStrings() {

OpenAppLockUITests/RuleCreationUITests.swift

@@ -131,6 +131,32 @@ final class RuleCreationUITests: XCTestCase {
         XCTAssertTrue(row.label.contains("Allowed"), "Got: \(row.label)")
     }
 
+    /// Block Adult Content is a Schedule-only option: the Time Limit editor must
+    /// not offer the toggle, and the rule's detail must not show the row.
+    func testTimeLimitOmitsAdultContent() throws {
+        let app = XCUIApplication.launchOpenAppLock()
+        app.buttons["newRuleButton"].waitToAppear().tap()
+        app.buttons["ruleKind-timeLimit"].waitToAppear().tap()
+
+        // Scroll to the bottom of the form, where Hard Mode lives. The adult
+        // toggle (which would sit beside it on a Schedule rule) is absent.
+        app.staticTexts["ruleEditorTitle"].waitToAppear()
+        app.swipeUp()
+        app.switches["hardModeToggle"].waitToAppear()
+        XCTAssertFalse(
+            app.switches["adultContentToggle"].exists,
+            "Time-limit rules must not offer Block Adult Content"
+        )
+
+        app.buttons["commitRuleButton"].waitToAppear().tap()
+        app.buttons["ruleCard-Time Keeper"].waitToAppear().tap()
+        app.element("detailRuleName").waitToAppear()
+        XCTAssertFalse(
+            app.element("detailRow-Adult websites").exists,
+            "Time-limit detail must not show the Adult websites row"
+        )
+    }
+
     func testEditorSupportsNativeSwipeBack() throws {
         let app = XCUIApplication.launchOpenAppLock()
         app.buttons["newRuleButton"].waitToAppear().tap()

Shared/LimitEnforcement.swift

@@ -91,8 +91,10 @@ struct LimitEnforcement {
         shields.applyShield(
             ruleID: snapshot.id,
             selectionData: snapshot.selectionData,
+            // Limit rules are always Block and never engage the adult-content
+            // filter — those are Schedule-only options.
             mode: .block,
-            blockAdultContent: snapshot.blockAdultContent
+            blockAdultContent: false
         )
     }
 }

Shared/RuleConfiguration.swift

@@ -0,0 +1,90 @@
+//
+//  RuleConfiguration.swift
+//  OpenAppLock
+//
+
+import Foundation
+
+/// The kind-specific options of a rule, modelled as a sum type so a rule can
+/// only carry the options that belong to its kind. This makes illegal states
+/// unrepresentable: an Open Limit rule cannot hold a time window, a Time Limit
+/// rule cannot hold a Block/Allow-Only mode, and neither limit kind can hold
+/// Block Adult Content — those are Schedule-only options.
+///
+/// Kind-common attributes (name, days, hardMode, isEnabled, appList,
+/// pausedUntil) live on the owning `BlockingRule` / `RuleDraft`, not here.
+enum RuleConfiguration: Hashable, Sendable {
+    case schedule(ScheduleConfig)
+    case timeLimit(TimeLimitConfig)
+    case openLimit(OpenLimitConfig)
+
+    var kind: RuleKind {
+        switch self {
+        case .schedule: .schedule
+        case .timeLimit: .timeLimit
+        case .openLimit: .openLimit
+        }
+    }
+
+    /// The default configuration for a brand-new rule of the given kind, using
+    /// the reference app's defaults (9–5 schedule, 45m/day, 5 opens/day).
+    static func `default`(for kind: RuleKind) -> RuleConfiguration {
+        switch kind {
+        case .schedule: .schedule(ScheduleConfig())
+        case .timeLimit: .timeLimit(TimeLimitConfig())
+        case .openLimit: .openLimit(OpenLimitConfig())
+        }
+    }
+
+    var scheduleConfig: ScheduleConfig? {
+        if case .schedule(let config) = self { config } else { nil }
+    }
+
+    var timeLimitConfig: TimeLimitConfig? {
+        if case .timeLimit(let config) = self { config } else { nil }
+    }
+
+    var openLimitConfig: OpenLimitConfig? {
+        if case .openLimit(let config) = self { config } else { nil }
+    }
+}
+
+/// Schedule-rule options: a recurring time window, how the app list is
+/// interpreted, and whether the adult-website filter engages while the window
+/// is active. A window whose end is at or before its start crosses midnight.
+struct ScheduleConfig: Hashable, Sendable {
+    var startMinutes: Int
+    var endMinutes: Int
+    var selectionMode: SelectionMode
+    var blockAdultContent: Bool
+
+    init(
+        startMinutes: Int = 9 * 60,
+        endMinutes: Int = 17 * 60,
+        selectionMode: SelectionMode = .block,
+        blockAdultContent: Bool = false
+    ) {
+        self.startMinutes = startMinutes
+        self.endMinutes = endMinutes
+        self.selectionMode = selectionMode
+        self.blockAdultContent = blockAdultContent
+    }
+}
+
+/// Time Limit option: a daily cumulative-usage budget in minutes.
+struct TimeLimitConfig: Hashable, Sendable {
+    var dailyLimitMinutes: Int
+
+    init(dailyLimitMinutes: Int = 45) {
+        self.dailyLimitMinutes = dailyLimitMinutes
+    }
+}
+
+/// Open Limit option: a daily budget of app opens.
+struct OpenLimitConfig: Hashable, Sendable {
+    var maxOpens: Int
+
+    init(maxOpens: Int = 5) {
+        self.maxOpens = maxOpens
+    }
+}

docs/RULES_FEATURE_SPEC.md

@@ -19,7 +19,7 @@ offered (Opal's "New Rule" sheet):
 | **Time Limit** | hourglass | "e.g. 45m/day" | After N minutes of cumulative use of selected apps per day, block them until a reset point |
 | **Open Limit** | padlock | "e.g. 5 opens/day" | After N opens of selected apps per day, block them (not demoed in video; inferred from card) |
 
-Common attributes across all types:
+**Common attributes** — present for *every* rule kind:
 
 - **Name** — user-editable, free text (presets: "Work Time", "Weekend Zen", "Locked In", "Sleep", "Wind Down", "Deep Sleep", "Laser Focus", "Reading Time", "Gym Time"; defaults for new rules: "In the Zone" (schedule), "Time Keeper" (time limit))
 - **Days of week** — 7-day toggle set, summarized as "Weekdays" / "Weekends" / "Every day" / custom
@@ -28,14 +28,26 @@ Common attributes across all types:
   independently of any rule. When editing a rule the user picks an existing
   list or creates a new one; editing a list affects every rule that uses it.
   Deleting a list detaches it from its rules (they fall back to "no apps").
-- **Selection mode** — **Block** (block the list) or **Allow Only** (block
-  everything except the list). The mode belongs to the *rule*, not the list.
-  Only **Schedule** rules offer the choice; Time Limit and Open Limit rules
-  are always Block (a usage budget over "everything except X" is not
-  meaningful, and drafts of those kinds are sanitized back to Block).
 - **Hard Mode** — boolean, PRO-gated in Opal; subtitle "No unblocks allowed". When off, the rule detail shows "Unblocks allowed: Yes"
 - **Enabled/disabled** — a rule can be disabled without deleting ("Disable Rule")
 
+**Per-kind options** — each kind carries only the options that make sense for
+it. The data model expresses this as a sum type (`RuleConfiguration`, see §5.2)
+so a kind structurally cannot hold another kind's options:
+
+- **Schedule** — a recurring **time window** (`From`/`To`, may cross midnight),
+  a **Selection mode** (**Block** the list, or **Allow Only** = block
+  everything except it; the mode belongs to the *rule*, not the list), and
+  **Block Adult Content** (engage Screen Time's adult-website filter while the
+  window is active).
+- **Time Limit** — a **daily minutes budget**.
+- **Open Limit** — a **daily opens budget**.
+
+  Selection mode and Block Adult Content are **Schedule-only**: a usage budget
+  over "everything except X" is not meaningful, and engaging a web-content
+  filter when a *usage* budget is spent does not fit the feature. Time Limit and
+  Open Limit rules are always Block and never touch the adult-content filter.
+
 Derived status (drives card/detail UI):
 - **Active** → countdown to window end: green pill "6h left"
 - **Inactive** → countdown to next activation: "Starts in 22h" / "Starts in 11h"
@@ -174,12 +186,13 @@ Sections (each an inset rounded group with a small icon + caption header):
      blocked" / "Only these apps are allowed" accordingly.
 4. **Hard Mode** `⚡PRO` badge — subtitle "No unblocks allowed"; trailing
    toggle.
-5. **Block Adult Content** *(OpenAppLock addition — not in the Opal video)* —
+5. **Block Adult Content** *(OpenAppLock addition — not in the Opal video;
-   subtitle "Filter adult websites while this rule is active"; trailing
+   **Schedule rules only**)* — subtitle "Filter adult websites while this rule
-   toggle. Maps to Screen Time's web-content filter
+   is active"; trailing toggle. Maps to Screen Time's web-content filter
    (`ManagedSettingsStore.webContent.blockedByFilter = .auto(...)`), applied
    and cleared together with the rule's shield. Surfaces in the rule detail
-   as an "Adult websites | Blocked/Allowed" row.
+   as an "Adult websites | Blocked/Allowed" row. Time Limit and Open Limit
+   editors do **not** offer this toggle (see §1, Per-kind options).
 6. **CTA**
    - Creating: full-width gradient pill "**Hold to Commit**" — a press-and-hold
      interaction (deliberate friction) that fills, then saves and dismisses to
@@ -198,14 +211,13 @@ Same chrome (back / title / rename). Sections:
 4. **🛡 Then block app** — row `Until` with stepper value `Tomorrow ⌃⌄`
    (reset point — e.g. tomorrow/next morning).
 5. **Hard Mode** toggle — same as Schedule.
-6. **Block Adult Content** toggle — same as Schedule.
+6. **Hold to Commit**. *(No Block Adult Content toggle — Schedule-only.)*
-7. **Hold to Commit**.
 
 ### 3.6 Rule Editor — Open Limit type
 
 Not demoed beyond its card. Spec by analogy: "When I open [apps]" /
 "More than `N opens ⌃⌄` (Daily)" / day picker / "Then block until …" /
-Hard Mode / Block Adult Content / Hold to Commit.
+Hard Mode / Hold to Commit. *(No Block Adult Content toggle — Schedule-only.)*
 
 ### 3.7 App Picker (shared component — also used in onboarding & timer)
 
@@ -309,36 +321,58 @@ Full-height sheet:
 
 ### 5.2 Data model (SwiftData)
 
-Replace the template `AppListProfile` with:
+The domain currency is a **sum type** so a rule can only hold the options that
+belong to its kind — illegal states (e.g. an Open Limit rule with a time
+window, or a Time Limit rule with Block Adult Content) are unrepresentable:
 
 ```swift
 enum RuleKind: String, Codable { case schedule, timeLimit, openLimit }
 enum SelectionMode: String, Codable { case block, allowOnly }
 
+enum RuleConfiguration: Hashable, Sendable {
+    case schedule(ScheduleConfig)
+    case timeLimit(TimeLimitConfig)
+    case openLimit(OpenLimitConfig)
+    var kind: RuleKind { … }
+}
+
+struct ScheduleConfig: Hashable, Sendable {   // Schedule-only options
+    var startMinutes: Int        // minutes from midnight, e.g. 540 = 09:00
+    var endMinutes: Int          // may be ≤ start (crosses midnight)
+    var selectionMode: SelectionMode
+    var blockAdultContent: Bool  // webContent.blockedByFilter = .auto(...)
+}
+struct TimeLimitConfig: Hashable, Sendable { var dailyLimitMinutes: Int }
+struct OpenLimitConfig: Hashable, Sendable { var maxOpens: Int }
+```
+
+The kind-common attributes (`name`, `days`, `hardMode`, `isEnabled`,
+`appList`, `pausedUntil`) live alongside the configuration:
+
+```swift
 @Model final class BlockingRule {
     var id: UUID
     var name: String
-    var kind: RuleKind
     var isEnabled: Bool
     var hardMode: Bool
-    var blockAdultContent: Bool      // webContent.blockedByFilter = .auto(...)
+    var appList: AppList?
-    var selectionMode: SelectionMode
+    var days: [Int]              // 1...7, Calendar weekday numbers
-    var selectionData: Data          // encoded FamilyActivitySelection
+    var pausedUntil: Date?
-    var days: [Int]                  // 1...7, Calendar weekday numbers
-    // schedule
-    var startMinutes: Int           // minutes from midnight, e.g. 540 = 09:00
-    var endMinutes: Int             // may be < start (crosses midnight)
-    // time limit
-    var dailyLimitMinutes: Int?
-    var resetPoint: String?          // "tomorrow" | "nextMorning" …
-    // open limit
-    var maxOpens: Int?
     var createdAt: Date
+    // The kind-specific options, exposed as a computed bridge over the
+    // model's raw stored columns:
+    var configuration: RuleConfiguration { get set }
+    var kind: RuleKind { configuration.kind }
 }
 ```
 
-`FamilyActivitySelection` is `Codable` → store as `Data`. Status
+`RuleDraft` (the editors' value-type working copy) carries the same
-("active", "starts in Xh", "Xh left") is **derived**, not stored.
+`configuration` + common fields, so each editor only renders its kind's
+options. `BlockingRule` persists the configuration as flat columns and the
+cross-process `RuleSnapshot` mirror keeps its flat wire shape; both are
+read/written exclusively through the sum type. `FamilyActivitySelection` is
+`Codable` → stored on the `AppList` as `Data`. Status ("active", "starts in
+Xh", "Xh left") is **derived**, not stored.
 
 ### 5.3 View inventory