Core Dependencies

Everything here comes from backend/pyproject.toml, managed with uv (uv sync installs all of it). You don’t need to know every package deeply — just what to blame when something breaks.

Web framework & validation

Package	What it does
`fastapi`	The web framework — turns your Python functions into HTTP endpoints
`pydantic`	Validates request/response data against the shapes in `models.py`
`pydantic-settings`	Reads `.env` into the `settings` object used everywhere
`python-multipart`	Parses form data — needed for the login endpoint
`email-validator`	Validates any field typed as an email address

Database & auth

Package	What it does
`sqlmodel`	The ORM — combines Pydantic (validation) and SQLAlchemy (database) into one model class
`psycopg`	The actual PostgreSQL driver underneath SQLModel
`alembic`	Generates and runs database migrations
`pyjwt`	Creates and verifies the JWT tokens used for login sessions
`pwdlib` (argon2, bcrypt)	Hashes passwords — never stores them as plain text

Email & reliability

Package	What it does
`emails` + `jinja2`	Sends templated emails (password reset)
`tenacity`	Retry logic — used to wait for the database to be ready on startup
`httpx`	Async HTTP client, mainly used in tests

Observability

Package	What it does
`sentry-sdk`	Error tracking — inactive unless you set `SENTRY_DSN`, and disabled locally either way

Dev tools (not shipped to production)

Package	What it does
`pytest` + `coverage`	Runs and measures the test suite
`ruff`	Lints and auto-formats the code
`mypy` + `ty`	Type checking