Implement efficient sync for Todoist and Trello APIs

- Add Todoist Sync API v9 support with incremental sync tokens
- Store sync tokens in SQLite for persistence across restarts
- Add field filtering to Trello API calls to reduce payload size
- Update handlers to use incremental sync (merge changes vs full replace)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

1 files changed, 27 insertions, 0 deletions

diff --git a/internal/handlers/handlers_test.go b/internal/handlers/handlers_test.go
index 3ea2a3e..1aa72cc 100644
--- a/internal/handlers/handlers_test.go
+++ b/internal/handlers/handlers_test.go
@@ -9,6 +9,7 @@ import (
 	"testing"
 	"time"
 
+	"task-dashboard/internal/api"
 	"task-dashboard/internal/config"
 	"task-dashboard/internal/models"
 	"task-dashboard/internal/store"
@@ -82,6 +83,32 @@ func (m *mockTodoistClient) CompleteTask(ctx context.Context, taskID string) err
 	return nil
 }
 
+func (m *mockTodoistClient) Sync(ctx context.Context, syncToken string) (*api.TodoistSyncResponse, error) {
+	if m.err != nil {
+		return nil, m.err
+	}
+	// Return a mock sync response with tasks converted to sync items
+	items := make([]api.SyncItemResponse, 0, len(m.tasks))
+	for _, task := range m.tasks {
+		items = append(items, api.SyncItemResponse{
+			ID:          task.ID,
+			Content:     task.Content,
+			Description: task.Description,
+			ProjectID:   task.ProjectID,
+			Priority:    task.Priority,
+			Labels:      task.Labels,
+			IsCompleted: task.Completed,
+			IsDeleted:   false,
+		})
+	}
+	return &api.TodoistSyncResponse{
+		SyncToken: "test-sync-token",
+		FullSync:  true,
+		Items:     items,
+		Projects:  []api.SyncProjectResponse{},
+	}, nil
+}
+
 // mockTrelloClient creates a mock Trello client for testing
 type mockTrelloClient struct {
 	boards []models.Board