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0001. Record architecture decisions; runtime dependencies

  • Status: accepted

  • Date: 2026-11-07

Context

Housecairn is built in small pull requests, by contributors and by an AI agent under human review. Decisions taken in one pull request must be visible to the next one, and the reasons behind them must survive. Every runtime dependency is also code we ship and must keep up to date.

Decision

Architecture decisions are recorded in docs/adr/, one file per decision, in the format context, decision, consequences.

Runtime dependencies are limited to well-maintained projects that replace code we would otherwise write (principle « do not reinvent »):

Package

Why

Django 5.2 LTS

Web framework, long-term support release.

djangorestframework

REST API (0004).

drf-spectacular, drf-spectacular-sidecar

OpenAPI 3.1 schema and a locally served interface (0004, 0011).

django-allauth, with its mfa and socialaccount extras

Local accounts, TOTP, passkeys, generic OpenID Connect (0007). The extras pull in fido2 (passkeys) and the OAuth/OIDC client libraries (requests, PyJWT, cryptography); they are part of allauth’s own feature set, not separate choices.

django-q2

Background tasks (0008).

django-environ

Configuration from environment variables (0012).

django-csp

Content Security Policy (0011).

python-dateutil

RFC 5545 recurrence rules, needed from the tasks lot onwards.

Pillow

Decodes and writes again the photos of rooms and items, to check their content and drop their metadata (0030).

django-stubs-ext

Lets generic classes such as ModelAdmin[Home] be subscripted at runtime for the type checker. Companion of django-stubs, maintained by the same project, no runtime behaviour otherwise.

Optional runtime dependency, installed with the postgres extra (uv sync --extra postgres) only by instances that use PostgreSQL:

Package

Why

psycopg, with its binary extra

PostgreSQL driver supported by Django. The binary extra ships a prebuilt libpq, so no compiler or system library is needed. Added by ADR 0014, which tests every pull request on PostgreSQL.

Development tools: uv (locking), ruff, mypy with django-stubs and djangorestframework-stubs, pytest, pytest-django, pytest-cov.

Consequences

  • Adding a runtime dependency requires a new ADR, or an amendment to this one in the same pull request.

  • uv.lock pins every package; updates go through pull requests.

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