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+# Code Quality Review
+
+## Overview
+This review focuses on the simplicity, security, and maintainability of the Task Dashboard codebase. The project follows a standard Go project structure with clear separation of concerns between handlers, API clients, storage, and models.
+
+## Simplicity & Maintainability
+
+### Strengths
+1.  **Clear Structure**: The `internal` package is well-organized into `api`, `config`, `handlers`, `models`, and `store`. This makes navigation intuitive.
+2.  **Standard Library Usage**: The project relies heavily on the Go standard library (`net/http`, `encoding/json`, `database/sql`, `html/template`), reducing external dependencies and keeping the codebase lightweight.
+3.  **Concurrency Management**: `aggregateData` in `handlers.go` effectively uses `sync.WaitGroup` and `sync.Mutex` to fetch data from multiple sources in parallel. The Trello client (`api/trello.go`) implements a semaphore pattern (limit of 5 concurrent requests) to limit concurrent requests, preventing rate limiting issues.
+4.  **Configuration**: `config/config.go` provides a centralized way to load and validate configuration from environment variables.
+
+### Areas for Improvement
+1.  **Error Handling in Goroutines**: In `aggregateData`, errors from goroutines are appended to a `data.Errors` slice. While this prevents the entire request from failing, it might mask critical issues if not monitored. Consider adding structured logging or metrics for these errors.
+2.  **Template Parsing**: Templates are parsed in `New` handler. In a development environment, it might be beneficial to re-parse templates on each request (or use a flag) to avoid restarting the server for template changes.
+3.  **Hardcoded Limits**: Some limits (e.g., fetching 20 notes in `HandleGetNotes`) are hardcoded. These could be moved to configuration.
+
+## Security
+
+### Strengths
+1.  **SQL Injection Prevention**: The `store/sqlite.go` implementation consistently uses parameterized queries (`?` placeholders) for all SQL operations (including `INSERT OR REPLACE`), effectively mitigating SQL injection risks.
+2.  **XSS Protection**: The use of `html/template` ensures that data rendered in HTML is automatically escaped, protecting against Cross-Site Scripting (XSS) attacks.
+3.  **Secret Management**: API keys and tokens are loaded from environment variables via `config/config.go`, ensuring secrets are not hardcoded in the source code.
+4.  **Database Locking**: The SQLite store enables WAL mode and sets `MaxOpenConns(1)` to handle concurrency safely and avoid "database is locked" errors.
+
+### Areas for Improvement
+1.  **CSRF Protection**: There is no explicit CSRF protection middleware visible in the handlers. Since the app performs state-changing actions (creating/completing tasks), adding a CSRF token to forms would be a security enhancement.
+2.  **Input Validation**: While basic validation exists (checking for empty fields in `HandleCreateCard` and `HandleCreateTask`), more rigorous validation on input length and format could be added.
+3.  **HTTPS**: The server runs on HTTP by default. For production deployment, ensuring it runs behind a reverse proxy with TLS (like Nginx or Caddy) is essential.
+
+## Testing
+The project includes test files (`sqlite_test.go`), indicating a commitment to testing.
+*   **Store Tests**: The `sqlite_test.go` file covers basic CRUD operations for notes, tasks, and cards, including specific tests for `DeleteTask` and `DeleteCard`. It also includes a test case specifically designed to verify protection against SQL injection (`TestGetNotes_SQLInjectionAttempt`).
+*   **Missing Tests**: A more comprehensive test suite covering handlers and API clients with mocks is missing and would further ensure reliability.
+
+## Conclusion
+The codebase is clean, secure, and follows Go best practices. It balances simplicity with necessary complexity (concurrency) well. Addressing the minor improvements in error handling and security (CSRF) would make it even more robust.