- 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
- Add user_clients table and UserClient model for many-to-many user-client assignment
- Add 'subcontractor' system role; users with this role see only assigned clients and their projects
- User helpers: is_scope_restricted, get_allowed_client_ids(), get_allowed_project_ids()
- Admin user form: assign clients when role is Subcontractor (multi-select, JS toggle)
- Scope filtering: clients, projects, time entries, reports, invoices, timer, API v1
- Direct access to out-of-scope client/project returns 403 (web and API)
- Migration 127_add_user_clients_table; scope_filter utility and ProjectService scope_client_ids
- Docs: SUBCONTRACTOR_ROLE.md, ADVANCED_PERMISSIONS.md, RBAC, CLIENT_PORTAL, README, CHANGELOG
Addresses GitHub Discussion #476 (user with limited clients/projects).
Dries Peeters