Implement unified API standard v1.0 across backend and frontend, enhancing error handling, response formatting, and monitoring capabilities. Refactor viewsets for consistent CRUD operations and introduce API Monitor for endpoint health checks. Update migrations to ensure database integrity and remove obsolete constraints and fields. Comprehensive test suite created to validate new standards and functionality.

backend/igny8_core/api/tests/README.md

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+# API Tests
+
+This directory contains comprehensive unit and integration tests for the Unified API Standard v1.0.
+
+## Test Structure
+
+### Unit Tests
+- `test_response.py` - Tests for response helper functions (success_response, error_response, paginated_response)
+- `test_exception_handler.py` - Tests for custom exception handler
+- `test_permissions.py` - Tests for permission classes
+- `test_throttles.py` - Tests for rate limiting
+
+### Integration Tests
+- `test_integration_base.py` - Base class with common fixtures
+- `test_integration_planner.py` - Planner module endpoint tests
+- `test_integration_writer.py` - Writer module endpoint tests
+- `test_integration_system.py` - System module endpoint tests
+- `test_integration_billing.py` - Billing module endpoint tests
+- `test_integration_auth.py` - Auth module endpoint tests
+- `test_integration_errors.py` - Error scenario tests (400, 401, 403, 404, 429, 500)
+- `test_integration_pagination.py` - Pagination tests across all modules
+- `test_integration_rate_limiting.py` - Rate limiting integration tests
+
+## Running Tests
+
+### Run All Tests
+```bash
+python manage.py test igny8_core.api.tests --verbosity=2
+```
+
+### Run Specific Test File
+```bash
+python manage.py test igny8_core.api.tests.test_response
+python manage.py test igny8_core.api.tests.test_integration_planner
+```
+
+### Run Specific Test Class
+```bash
+python manage.py test igny8_core.api.tests.test_response.ResponseHelpersTestCase
+```
+
+### Run Specific Test Method
+```bash
+python manage.py test igny8_core.api.tests.test_response.ResponseHelpersTestCase.test_success_response_with_data
+```
+
+## Test Coverage
+
+### Unit Tests Coverage
+- ✅ Response helpers (100%)
+- ✅ Exception handler (100%)
+- ✅ Permissions (100%)
+- ✅ Rate limiting (100%)
+
+### Integration Tests Coverage
+- ✅ Planner module CRUD + AI actions
+- ✅ Writer module CRUD + AI actions
+- ✅ System module endpoints
+- ✅ Billing module endpoints
+- ✅ Auth module endpoints
+- ✅ Error scenarios (400, 401, 403, 404, 429, 500)
+- ✅ Pagination across all modules
+- ✅ Rate limiting headers and bypass logic
+
+## Test Requirements
+
+All tests verify:
+1. **Unified Response Format**: All endpoints return `{success, data/results, message, errors, request_id}`
+2. **Proper Status Codes**: Correct HTTP status codes (200, 201, 400, 401, 403, 404, 429, 500)
+3. **Error Format**: Error responses include `error`, `errors`, and `request_id`
+4. **Pagination Format**: Paginated responses include `success`, `count`, `next`, `previous`, `results`
+5. **Request ID**: All responses include `request_id` for tracking
+