Split MAX bot loops and make chats cache-first

server/QMax.Api/Controllers/ChatsController.cs

@@ -59,7 +59,12 @@ public sealed class ChatsController(
     }
 
     [HttpGet("{chatId:guid}/messages")]
-    public async Task<ActionResult<IReadOnlyList<MessageDto>>> GetMessages(Guid chatId, int take = 80, DateTimeOffset? before = null, CancellationToken cancellationToken = default)
+    public async Task<ActionResult<IReadOnlyList<MessageDto>>> GetMessages(
+        Guid chatId,
+        int take = 80,
+        DateTimeOffset? before = null,
+        bool sync = false,
+        CancellationToken cancellationToken = default)
     {
         var chat = await db.Chats.FirstOrDefaultAsync(x => x.Id == chatId && x.DeletedAt == null, cancellationToken);
         if (chat is null)
@@ -67,7 +72,7 @@ public sealed class ChatsController(
             return NotFound();
         }
 
-        if (before is null && !string.IsNullOrWhiteSpace(chat.ExternalId))
+        if (sync && before is null && !string.IsNullOrWhiteSpace(chat.ExternalId))
         {
             await syncService.SyncChatHistoryAsync(chat.ExternalId, chat.WebUrl, cancellationToken);
             db.ChangeTracker.Clear();