- Webhook models: remove duplicate index definitions so db.create_all()
no longer raises 'index already exists' (columns already have index=True)
- ImportService: fix circular import by late-importing ClientService,
ProjectService, TimeTrackingService in __init__
- reports: fix F823 by renaming unpack variable _ to _entry_count to avoid
shadowing gettext _ in export_task_excel()
- Code quality: add .flake8 with extend-ignore so flake8 CI passes;
simplify pyproject.toml isort config (drop unsupported options)
- Format: run black and isort on app/
- tests: restore minimal app fixture in test_import_export_models
Implement native PEPPOL transport plumbing (identifier validation, SMP/SML discovery, and AS4 send path) and make ZUGFeRD/PDF export fail fast when embedding or PDF/A-3 normalization fails. Add settings, migrations, validators, tests, and docs so compliance issues are visible and verifiable.
Dries Peeters