Follow-up to the RBAC v13 + marketplace work in the parent commit. Addresses
deferred Devin findings, gemini-flagged blockers, and adds three guard rails.
== Schema v14 — FK constraints on user_group_members + resource_grants ==
Adds DuckDB foreign-key constraints so cascade deletes can no longer leave
orphaned member / grant rows pointing at a deleted group_id (which were
relying on application-level cascades up to v13). Migration is RENAME →
CREATE-with-FK → INSERT → DROP, wrapped in BEGIN TRANSACTION so a partial
failure rolls back without leaving the DB at a half-applied schema.
== AGNES_ENABLE_TABLE_GRANTS feature flag (default off) ==
ResourceType.TABLE was shipped in the parent commit as listing-only — admins
can record grants but runtime enforcement still flows through legacy
dataset_permissions. To avoid the misleading-UX surface area, the chip is
hidden from /admin/access and POST /api/admin/grants returns 422 with the
env-var name in detail until the operator opts in. Existing TABLE rows in
resource_grants stay listable + deletable so cleanup is never blocked.
Helpers: is_resource_type_enabled(rt), enabled_resource_types().
== Break-glass admin CLI ==
`da admin break-glass <user>` adds the user to the Admin user_group with
source='system_seed' regardless of RBAC state. Bypasses authentication —
relies on filesystem access to ${DATA_DIR}/state/system.duckdb implying
host-level trust. Recovery path when the operator has locked themselves
out of /admin/access.
== Devin round-2 fixes (deferred on b4ec4c4) ==
- src/repositories/user_groups.py — narrow update() guard from blocking any
mutation on system groups to blocking name change only. Description edits
now pass through. Endpoint pre-check stays as defense-in-depth. Prior
behavior surfaced as a misleading 409 'Cannot rename a system group' on
description-only PATCH.
- app/api/access.py:delete_group — wrap cascade DELETEs + repo.delete in
BEGIN TRANSACTION / COMMIT / ROLLBACK. Prevents orphan rows if any
DELETE fails after the user_groups row is gone.
- app/marketplace_server/{packager,router}.py — split compute_etag_for_user()
from build_zip(); router resolves etag first and 304-shorts before any
file read or ZIP_DEFLATED. In-process cachetools.TTLCache (default 120s,
env-tunable via AGNES_MARKETPLACE_ETAG_TTL, set 0 to disable).
invalidate_etag_cache() called by sync to force re-hash on content drift.
== Tests ==
- TestTableGrantsFeatureFlag (4 cases) — endpoint exclude/include, grant
rejection/acceptance under the flag.
- test_v12_to_v13_finalize_rollback_on_failure — destructive: monkeypatches
_seed_system_groups to raise mid-transaction, asserts schema_version stays
at 12, legacy tables intact, new tables empty (rollback fired). Then
restores the real function and asserts the retry succeeds.
- test_update_system_group_description_allowed,
test_update_system_group_same_name_no_op — repo-level coverage of the
narrowed guard.
7147bac079