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zipit/loop_runs/v5_feedback/requirements

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+**PROJECT NAME:** Todo-sovellus
+
+**GOAL:** Create a simple task management application for individuals to keep track of their daily tasks and manage them efficiently.
+
+**CORE FEATURES:**
+1. Add new tasks with title, description, due date, and status.
+2. View all tasks with filtering by status (e.g., pending, completed).
+3. Update existing tasks including changing the title, description, due date, and status.
+4. Delete tasks that are no longer needed.
+5. Mark tasks as completed or pending.
+6. Search for tasks by keywords in the title or description.
+7. Export task list to a CSV file.
+
+**DATA MODEL:**
+1. **Task**
+   - id (integer, primary key)
+   - title (string, required)
+   - description (text, optional)
+   - due_date (date, optional)
+   - status (enum ['pending', 'completed'], default 'pending')
+
+2. **User**
+   - id (integer, primary key)
+   - username (string, unique, required)
+   - email (string, unique, required)
+   - password_hash (string, required)
+
+**API ENDPOINTS:**
+1. **GET /tasks** - Retrieve all tasks with optional filters by status.
+2. **POST /tasks** - Create a new task.
+3. **GET /tasks/{task_id}** - Retrieve a specific task by ID.
+4. **PUT /tasks/{task_id}** - Update an existing task.
+5. **DELETE /tasks/{task_id}** - Delete a task.
+6. **POST /users/register** - Register a new user.
+7. **POST /users/login** - Authenticate and return a token for authorized access.
+
+**CONSTRAINTS:**
+- Must use SQLite as the database.
+- No authentication is required for accessing CRUD operations.
+- Implement unit tests for all API endpoints.