Fix missed conversation replies

src/services/conversation-automation.ts

@@ -88,14 +88,15 @@ export class ConversationAutomationService {
     private readonly pendingReplyRetryDelayMs = PENDING_REPLY_RETRY_DELAY_MS,
   ) {}
 
-  async processUnreadConversations(signal?: AbortSignal): Promise<ConversationAutomationResult[]> {
+  async processPendingConversations(signal?: AbortSignal): Promise<ConversationAutomationResult[]> {
     this.processing = true;
     let conversations: ActiveChat[] = [];
     try {
+      const previousScanAt = this.lastScanAt;
       await this.chat.refreshTopChats(REPLY_REFRESH_LIMIT);
       conversations = await this.chat.getCachedConversations();
       this.reconcilePendingClaims(conversations);
-      const actionable = this.actionableConversations(conversations);
+      const actionable = this.actionableConversations(conversations, previousScanAt);
       this.actionableBacklog = actionable.length;
       this.oldestPendingAt = actionable[0]?.messages?.at(-1)?.timestamp ?? null;
       this.lastScanAt = this.now();
@@ -144,10 +145,10 @@ export class ConversationAutomationService {
     conversation: ActiveChat,
     signal?: AbortSignal,
   ): Promise<ConversationAutomationResult | null> {
-    if (!conversation.unread || conversation.isFromUs || !conversation.roomId || !conversation.url) return null;
+    if (!conversation.roomId || !conversation.url) return null;
     const messages = conversation.messages ?? [];
-    const latest = messages.at(-1);
-    if (!latest || latest.isSelf) return null;
+    const latest = latestInboundMessage(messages);
+    if (!latest) return null;
 
     const conversationId = conversation.roomId;
     const opener = this.openers.getByChatRoomId(conversationId);
@@ -322,9 +323,12 @@ export class ConversationAutomationService {
     );
   }
 
-  private actionableConversations(conversations: ActiveChat[]): ActiveChat[] {
+  private actionableConversations(
+    conversations: ActiveChat[],
+    observedAfter: number | null = this.lastScanAt,
+  ): ActiveChat[] {
     return conversations
-      .filter((conversation) => this.isActionableConversation(conversation))
+      .filter((conversation) => this.isActionableConversation(conversation, observedAfter))
       .sort((left, right) => {
         const leftAt = left.messages?.at(-1)?.timestamp ?? left.lastMessageTime;
         const rightAt = right.messages?.at(-1)?.timestamp ?? right.lastMessageTime;
@@ -346,19 +350,25 @@ export class ConversationAutomationService {
     }
   }
 
-  private isActionableConversation(conversation: ActiveChat): boolean {
-    if (!conversation.unread || conversation.isFromUs || !conversation.roomId || !conversation.url) return false;
-    const latest = conversation.messages?.at(-1);
-    if (!latest || latest.isSelf) return false;
+  private isActionableConversation(conversation: ActiveChat, observedAfter: number | null): boolean {
+    if (!conversation.roomId || !conversation.url) return false;
+    const latest = latestInboundMessage(conversation.messages ?? []);
+    if (!latest) return false;
     const opener = this.openers.getByChatRoomId(conversation.roomId);
     if (!opener || latest.timestamp <= opener.sentAt) return false;
     const incomingKey = messageKey(latest);
     const claim = this.claims.getClaim?.(conversation.roomId, incomingKey);
     if (claim?.status === 'pending') return true;
     if (claim?.status === 'sent') return false;
+    // On the first scan after startup, retain Matrix unread as the conservative
+    // bootstrap signal so a deployment cannot revive historical read replies.
+    // Later scans can recover fresh inbound events even if that flag cleared.
+    if (!conversation.unread && (observedAfter === null || latest.timestamp <= observedAfter)) return false;
     const state = this.states.get(conversation.roomId);
-    if (!state) return true;
-    return state.automation.status === 'active' && state.automation.lastIncomingKey !== incomingKey;
+    if (state) {
+      return state.automation.status === 'active' && state.automation.lastIncomingKey !== incomingKey;
+    }
+    return true;
   }
 
   private advanceStateForReply(
@@ -454,6 +464,17 @@ export class ConversationAutomationService {
   }
 }
 
+/**
+ * Matrix unread counts are presentation state and can return to zero before
+ * the automation worker observes an inbound event. The durable message list,
+ * opener timestamp, scan watermark, conversation state, and event claim decide
+ * whether work remains; only a latest inbound event can enter that flow.
+ */
+function latestInboundMessage(messages: ChatMessage[]): ChatMessage | null {
+  const latest = messages.at(-1);
+  return latest && !latest.isSelf ? latest : null;
+}
+
 function hasReceivedImage(messages: ChatMessage[]): boolean {
   return messages.some((message) => !message.isSelf && (message.media?.length ?? 0) > 0);
 }