Two Devin-flagged regressions on the squashed PR #106 head:
1) PATCH /api/admin/groups/{id} blanket-rejected on system groups.
The repository guard at src/repositories/user_groups.py was already
narrowed to "rename only" by 7147bac (PR #110 follow-up), but the
endpoint at app/api/access.py:331-343 still short-circuited with
409 "System groups are immutable" for any mutation. A description-only
payload like {"description": "..."} returned 409 instead of 200 even
though the repo would have accepted it. CHANGELOG entry promised the
fix but the code didn't match.
Endpoint now mirrors the repo contract: 409 only when payload.name
is set AND differs from existing name. Same-name no-op renames are
dropped before the repo call. Description-only updates flow through.
2) Google OAuth callback wiped google_sync memberships on transient
API failure.
fetch_user_groups is fail-soft and returns [] for both "user has no
groups" and "Cloud Identity API error". The callback fed that empty
list into replace_google_sync_groups, which DELETEs all rows with
source='google_sync' for the user then INSERTs zero — silently
wiping every Workspace-synced membership on a hiccup.
Callback now skips replace_google_sync_groups when group_names is
empty and logs "preserving existing memberships". Trade-off: a user
whose Workspace groups were genuinely cleared keeps stale memberships
until the next non-empty sync. Admin-added rows (source='admin') were
already protected by source-scope and are unaffected. The previous
guard against this exact regression was test_callback_empty_groups_
does_not_overwrite_existing in tests/test_auth_providers.py — that
test class has been skipped since v12 (asserts users.groups JSON,
needs rewrite for user_group_members).
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