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2026-05-22 — /api/arm/.../locations ModuleNotFoundError fix

Motivation

api/routes/arm.py::list_locations imported from azure.mgmt.subscription import SubscriptionClient, but azure-mgmt-subscription is not pinned in pyproject.toml. The deployed image happened to carry it transitively, but a fresh local uv sync does not. Result: GET /api/arm/subscriptions/<id>/locations raised ModuleNotFoundError: No module named 'azure.mgmt.subscription' and the SPA's region picker fell back to its bundled list with no diagnostic.

User-facing change

GET /api/arm/subscriptions/{subscription_id}/locations returns the live subscription location list again. No SPA change.

API / IaC diff summary

  • api/routes/arm.py: swap the lazy import to from azure.mgmt.resource import SubscriptionClient. azure-mgmt-resource==23.2.0 is already pinned and re-exports the same SDK-generated SubscriptionClient (azure.mgmt.resource.subscriptions._subscription_client.SubscriptionClient). The method surface used by this route (client.subscriptions.list_locations(subscription_id)) is identical.
  • No new dependency; no pyproject.toml / uv.lock change.

Validation evidence

$ uv run ruff check api/routes/arm.py
All checks passed!

$ uv run pytest -q api/tests -k arm
94 passed, 1166 deselected in 3.50s

# Live route after restart (auth bypass disabled — 401 means it reached the auth gate cleanly):
$ curl -s -o /tmp/loc.out -w 'HTTP:%{http_code}\n' \
    http://127.0.0.1:8085/api/arm/subscriptions/<sub>/locations
HTTP:401
{"detail":"missing bearer token"}

# Before the fix the same request returned 500 with
# `ModuleNotFoundError: No module named 'azure.mgmt.subscription'` in the api log.
$ grep -c ModuleNotFoundError .logs/local/latest/api.log
0