Geti Backend Development

For the full architecture reference (layered design, app/ layout, adding an endpoint end-to-end, library integration and job execution) read application/backend/AGENTS.md.

Quick Start

• Work from application/backend/.
• Create or refresh the environment with just venv --accelerator cpu for normal local work.
• Switch to cuda or xpu only when the task depends on accelerator-specific behavior.
• Start with just lint, then run the narrowest relevant test target.

Workflow

1. Keep the change inside the existing backend boundaries unless the task explicitly crosses into libraries/getitune/ or application/ui/.
2. Keep routers thin and move business logic into services or repositories that match the existing package structure.
3. Generate a fresh OpenAPI spec when router or schema changes affect the API contract.
4. Hand off to the $geti-openapi-sync skill after backend contract changes so the UI types stay aligned.

Architecture Reminders

• The request flow is layered: app.api → app.services → app.repositories → app.db. Respect the import-linter contracts in pyproject.toml.
• Keep app.api.routers above app.api.schemas, and app.api.schemas above app.api.dependencies.
• Pydantic API schemas (app/api/schemas/), domain models (app/models/), and SQLAlchemy ORM models (app/db/schema.py) are separate layers — never return raw ORM models from a router.
• Schema changes require an Alembic migration under app/alembic/versions/.
• Long-running work (training, quantization, dataset import/export) runs out-of-process via app/core/jobs/ and lazily-imported builders in app/execution/; training calls into the getitune library.
• Treat run-server --clean and _clean_data as destructive helpers.

Verification

• Use just lint for Ruff, import-linter, and pyrefly checks.
• Use just test-unit -- tests/unit/... or just test-unit -- -k <expr> for routine backend changes.
• Use just test-integration -- <pytest args> when the change crosses service, persistence, or API boundaries.
• Use just test-bdd -- <behave args> when behavior is covered by BDD specs.
• Use just gen-api-spec --output-path openapi-spec.json after intentional API contract changes.

Coordination Notes

• application/backend depends on the local editable ../../libraries/getitune. Validate libraries/getitune/ too when shared model or training behavior changes.
• Prefer project just targets over custom shell commands so local work matches CI.