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Dries Peeters 9547937be2 docs: update README and guides, add audit and strategy docs

- Simplify README version section and point to CHANGELOG
- Update UI overview with Reports and installation reference
- Refresh CONTRIBUTING, DEVELOPMENT, API.md links/consistency
- Add ARCHITECTURE_AUDIT, DOCS_AUDIT, PRODUCT_UX_AUDIT, FRONTEND, PERFORMANCE
- Add API_CONSISTENCY_AUDIT, RESPONSE_FORMAT, CONTRIBUTOR_GUIDE, TESTING_STRATEGY
- Update GETTING_STARTED, REST_API, PROJECT_STRUCTURE, DEPLOYMENT_GUIDE

2026-03-15 09:36:37 +01:00

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API Consistency Audit

This document records the API consistency audit performed for the TimeTracker backend, REST API, and native clients (desktop and mobile). It describes findings and the standardized contracts adopted.

1. Response shapes

1.1 Success responses

Helpers in app/utils/api_responses.py define success_response() (returns { "success": true, "data"?, "message"?, "meta"? }) and paginated_response() (items in data, pagination in meta.pagination).
Actual API uses a different convention: list endpoints return resource-named key + top-level pagination, e.g. { "time_entries": [...], "pagination": {...} }, { "projects": [...], "pagination": {...} }. Single-resource responses use a singular key: { "time_entry": {...} }, { "project": {...} }, { "timer": {...} }.
Contract (kept for compatibility): List = { "<resource_plural>": [...], "pagination": { page, per_page, total, pages, has_next, has_prev, next_page, prev_page } }. Single = { "<resource_singular>": {...} }. Created (201) = { "message"?, "<resource_singular>": {...} } or similar. Clients depend on these keys; we do not switch to data/meta.

1.2 Error responses (standardized)

Contract: All API v1 error responses (4xx/5xx) include:
- error (string): user-facing message (backward compatible).
- message (string): same or more detail.
- error_code (string, optional): machine-readable code, e.g. unauthorized, forbidden, not_found, validation_error, no_active_timer.
- errors (object, optional): field-level validation errors, e.g. { "field_name": ["message1", "message2"] }.
- For 403 scope errors: required_scope, available_scopes may also be present.

1.3 Validation errors

Contract: Any 400 due to invalid input uses the same structure: error_code: "validation_error" and, when applicable, an errors object with field-level messages. Marshmallow validation uses handle_validation_error(); manual validation uses validation_error_response().

2. Pagination

Contract: List endpoints support query params page (default 1) and per_page (default 50, max 100). Response includes "pagination": { "page", "per_page", "total", "pages", "has_next", "has_prev", "next_page", "prev_page" }. The list key is resource-specific (e.g. time_entries, projects), not items.

3. Auth / token handling

Token extraction (Bearer, Token, X-API-Key) and @require_api_token(scope) are consistent. Auth error responses include error_code (unauthorized, forbidden) for consistent machine-readable handling.

4. Date/time

Contract: Dates and datetimes use ISO 8601. Request parsing accepts YYYY-MM-DD and YYYY-MM-DDTHH:MM:SS / YYYY-MM-DDTHH:MM:SSZ. Serialization format (e.g. UTC or server local) is documented in the REST API reference.

5. Sort / filter

Filter query parameters are resource-specific and documented per endpoint. Optional sort / order conventions may be documented for list endpoints that support them.

6. References

REST API reference: REST_API.md — endpoints, request/response formats, pagination, errors.
OpenAPI: /api/openapi.json and Swagger UI at /api/docs — aligned with this contract where updated.

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