Restore the infrastructure for saving conditional GET info, since the built-in caching isn’t handling this as well as it appeared at first.

Account/Sources/Account/Account.swift

@@ -919,6 +919,14 @@ public final class Account: DisplayNameProvider, UnreadCountProvider, Container,
 	
 	// MARK: - Debug
 
+	public func debugDropConditionalGetInfo() {
+#if DEBUG
+		for feed in flattenedWebFeeds() {
+			feed.dropConditionalGetInfo()
+		}
+#endif
+	}
+
 	public func debugRunSearch() {
 		#if DEBUG
 			let t1 = Date()

Account/Sources/Account/CloudKit/CloudKitAccountDelegate.swift

@@ -792,6 +792,7 @@ private extension CloudKitAccountDelegate {
 					return
 				}
 				self.articlesZone.deleteArticles(webFeedExternalID) { result in
+					feed.dropConditionalGetInfo()
 					self.syncProgress.completeTask()
 					completion(result)
 				}

Account/Sources/Account/CloudKit/CloudKitAccountZoneDelegate.swift

@@ -82,8 +82,9 @@ class CloudKitAcountZoneDelegate: CloudKitZoneDelegate {
 	
 	func removeWebFeed(_ externalID: String) {
 		if let webFeed = account?.existingWebFeed(withExternalID: externalID), let containers = account?.existingContainers(withWebFeed: webFeed) {
-			containers.forEach {
-				$0.removeWebFeed(webFeed)
+			for container in containers {
+				webFeed.dropConditionalGetInfo()
+				container.removeWebFeed(webFeed)
 			}
 		}
 	}

Account/Sources/Account/DataExtensions.swift

@@ -26,6 +26,7 @@ public extension WebFeed {
 		public static let editedName = "editedName"
 		public static let authors = "authors"
 		public static let contentHash = "contentHash"
+		public static let conditionalGetInfo = "conditionalGetInfo"
 	}
 }
 

Account/Sources/Account/WebFeed.swift

@@ -123,6 +123,15 @@ public final class WebFeed: Feed, Renamable, Hashable {
 		}
 	}
 
+	public var conditionalGetInfo: HTTPConditionalGetInfo? {
+		get {
+			return metadata.conditionalGetInfo
+		}
+		set {
+			metadata.conditionalGetInfo = newValue
+		}
+	}
+
 	public var contentHash: String? {
 		get {
 			return metadata.contentHash
@@ -235,6 +244,13 @@ public final class WebFeed: Feed, Renamable, Hashable {
 		self.metadata = metadata
 	}
 
+	// MARK: - API
+
+	public func dropConditionalGetInfo() {
+		conditionalGetInfo = nil
+		contentHash = nil
+	}
+
 	// MARK: - Hashable
 
 	public func hash(into hasher: inout Hasher) {

Account/Sources/Account/WebFeedMetadata.swift

@@ -26,6 +26,7 @@ final class WebFeedMetadata: Codable {
 		case contentHash
 		case isNotifyAboutNewArticles
 		case isArticleExtractorAlwaysOn
+		case conditionalGetInfo
 		case externalID = "subscriptionID"
 		case folderRelationship
 	}
@@ -102,6 +103,14 @@ final class WebFeedMetadata: Codable {
 		}
 	}
 
+	var conditionalGetInfo: HTTPConditionalGetInfo? {
+		didSet {
+			if conditionalGetInfo != oldValue {
+				valueDidChange(.conditionalGetInfo)
+			}
+		}
+	}
+
 	var externalID: String? {
 		didSet {
 			if externalID != oldValue {

Mac/AppDelegate.swift

@@ -704,6 +704,14 @@ extension AppDelegate {
 		AccountManager.shared.defaultAccount.debugRunSearch()
 	}
 
+	@IBAction func debugDropConditionalGetInfo(_ sender: Any?) {
+#if DEBUG
+		for account in AccountManager.shared.activeAccounts {
+			account.debugDropConditionalGetInfo()
+		}
+#endif
+	}
+
 	@IBAction func debugTestCrashReporterWindow(_ sender: Any?) {
 		#if DEBUG
 			crashReportWindowController = CrashReportWindowController(crashLogText: "This is a test crash log.")