Enhance chat retrieval and update functionality in Xun

- Added 'updated_at' field to the chat selection query to include the last modified timestamp in chat responses.
- Updated the ordering of chat results to prioritize 'updated_at' over 'created_at', improving the relevance of displayed chats.
- Modified the handling of chat creation timestamps to fall back on 'created_at' if 'updated_at' is not available, ensuring consistent date representation.
- Implemented an update mechanism for the 'updated_at' field when saving chat history, enhancing data integrity and tracking.

These changes improve the chat management capabilities of the Neo API assistant, ensuring more accurate and relevant chat data retrieval.

neo/store/xun.go

@@ -335,7 +335,7 @@ func (conv *Xun) GetChats(sid string, filter ChatFilter) (*ChatGroupResponse, er
 
 	// Build base query
 	qb := conv.newQueryChat().
-		Select("chat_id", "title", "created_at").
+		Select("chat_id", "title", "created_at", "updated_at").
 		Where("sid", userID).
 		Where("chat_id", "!=", "")
 
@@ -358,7 +358,9 @@ func (conv *Xun) GetChats(sid string, filter ChatFilter) (*ChatGroupResponse, er
 	lastPage := int(math.Ceil(float64(total) / float64(filter.PageSize)))
 
 	// Get paginated results
-	rows, err := qb.OrderBy("created_at", filter.Order).
+	rows, err := qb.
+		OrderBy("updated_at", filter.Order).
+		OrderBy("created_at", filter.Order).
 		Offset(offset).
 		Limit(filter.PageSize).
 		Get()
@@ -392,8 +394,13 @@ func (conv *Xun) GetChats(sid string, filter ChatFilter) (*ChatGroupResponse, er
 			"title":   row.Get("title"),
 		}
 
+		var dbDatetime = row.Get("updated_at")
+		if dbDatetime == nil {
+			dbDatetime = row.Get("created_at")
+		}
+
 		var createdAt time.Time
-		switch v := row.Get("created_at").(type) {
+		switch v := dbDatetime.(type) {
 		case time.Time:
 			createdAt = v
 		case string:
@@ -608,6 +615,15 @@ func (conv *Xun) SaveHistory(sid string, messages []map[string]interface{}, cid
 		return err
 	}
 
+	// Update Chat updated_at
+	_, err = conv.newQueryChat().
+		Where("chat_id", cid).
+		Where("sid", userID).
+		Update(map[string]interface{}{"updated_at": now})
+	if err != nil {
+		return err
+	}
+
 	return nil
 }