keep disappearing message update control message for legacy mode

Session/Conversations/Settings/ThreadDisappearingMessagesSettingsViewModel.swift

@@ -484,12 +484,19 @@ class ThreadDisappearingMessagesSettingsViewModel: SessionTableViewModel, Naviga
         dependencies.storage.writeAsync(using: dependencies) { [threadId, threadVariant, dependencies] db in
             _ = try updatedConfig.saved(db)
             
-            _ = try Interaction
-                .filter(Interaction.Columns.threadId == threadId)
-                .filter(Interaction.Columns.variant == Interaction.Variant.infoDisappearingMessagesUpdate)
-                .deleteAll(db)
-            
             let currentOffsetTimestampMs: Int64 = SnodeAPI.currentOffsetTimestampMs()
+            var expiresInSeconds: TimeInterval? = nil
+            var expiresStartedAtMs: Double? = nil
+            
+            if Features.useNewDisappearingMessagesConfig {
+                _ = try Interaction
+                    .filter(Interaction.Columns.threadId == threadId)
+                    .filter(Interaction.Columns.variant == Interaction.Variant.infoDisappearingMessagesUpdate)
+                    .deleteAll(db)
+                
+                expiresInSeconds = (updatedConfig.isEnabled ? nil : self.config.durationSeconds)
+                expiresStartedAtMs = (!updatedConfig.isEnabled && self.config.type == .disappearAfterSend ? Double(currentOffsetTimestampMs) : nil)
+            }
             
             let interaction: Interaction = try Interaction(
                 threadId: threadId,
@@ -497,8 +504,8 @@ class ThreadDisappearingMessagesSettingsViewModel: SessionTableViewModel, Naviga
                 variant: .infoDisappearingMessagesUpdate,
                 body: updatedConfig.messageInfoString(with: nil, isPreviousOff: !self.config.isEnabled),
                 timestampMs: currentOffsetTimestampMs,
-                expiresInSeconds: (updatedConfig.isEnabled ? nil : self.config.durationSeconds),
+                expiresInSeconds: expiresInSeconds,
-                expiresStartedAtMs: (!updatedConfig.isEnabled && self.config.type == .disappearAfterSend ? Double(currentOffsetTimestampMs) : nil)
+                expiresStartedAtMs: expiresStartedAtMs
             )
             .inserted(db)
             

SessionMessagingKit/Sending & Receiving/Message Handling/MessageReceiver+ExpirationTimers.swift

@@ -109,12 +109,6 @@ extension MessageReceiver {
             try remoteConfig.save(db)
         }
         
-        // Remove previous info messages
-        _ = try Interaction
-            .filter(Interaction.Columns.threadId == threadId)
-            .filter(Interaction.Columns.variant == Interaction.Variant.infoDisappearingMessagesUpdate)
-            .deleteAll(db)
-        
         // Add an info message for the user
         let currentUserPublicKey: String = getUserHexEncodedPublicKey(db)
         _ = try Interaction(
@@ -136,8 +130,7 @@ extension MessageReceiver {
                 timestampMs: (timestampMs * 1000),
                 userPublicKey: currentUserPublicKey,
                 openGroup: nil
-            ),
+            )
-            expiresInSeconds: (remoteConfig.isEnabled ? nil : localConfig.durationSeconds)
         ).inserted(db)
     }