Technical debt

[tgrx]

• API is documented #4
• AppClient is refactored: duplicated code #7
• CI is set up
• Tests start DB & dev server automatically
• A separate container to run tests in it
• Todos are reviewed and documented in issues
• Tests for books use cases are added (Usecases are refactored #11)
• Toggle including books to Author output
• Toggle including authors to Book output
• Implement sorting
• Implement pagination
• Implement fuzzy search
• Implement auditing
• Implement health check
• Rename id parameters to corresponding <model>_id wherever possible (Usecases are refactored #11)
• Implement additional validators for models fields (Data are validated against integrity #13)
• Refactor AppClientError (Usecases are refactored #11)
• Refactor UseCases in terms of redundancy (Usecases are refactored #11, Data are validated against integrity #13)
• Refactor API responses (Data are validated against integrity #13)
• Refactor API requests deserialisation
• Refactor AuthorRepo method signatures (Usecases are refactored #11, Data are validated against integrity #13)
• Use Undefined const instead of None in default args use None for that purpose
• Implement SqlAlchemy repos (Usecases are refactored #11, Data are validated against integrity #13)
• Implement dependency injection
• Duplicate author-book assignments are forbidden (Data are validated against integrity #13)
• Forbid to delete Book if one of its Authors will become degenerate (Data are validated against integrity #13)
• Annotate retry decorator factory in clientlib
• Mark all tests either unit or e2e (Authors user data are validated #12, Data are validated against integrity #13)
• Authors user data are validated (Authors user data are validated #12, Data are validated against integrity #13)
• Books user data are validated (Data are validated against integrity #13)