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* fix(security): scope DELETE/UpdateIssueStatus by workspace_id Add workspace_id to the WHERE clause of DeleteIssue, DeleteComment, DeleteProject, DeleteSkill, DeleteChatSession, and UpdateIssueStatus as SQL-layer defense-in-depth. Handler loaders (loadIssueForUser / loadSkillForUser / etc.) already enforce workspace membership today, so this is not patching a known live vuln. But the tenant invariant is currently a handler-layer guarantee — a future loader bypass or a new caller skipping the loader would be silently catastrophic. Making workspace_id part of the SQL identity collapses the trust surface to the schema itself: forging a sibling-workspace UUID becomes ErrNoRows instead of a cross-tenant write. Reference: incident #1661 (util.ParseUUID silent zero UUID returning 204 on a DELETE that matched zero rows) — same class of failure, prevented at a different layer. Scope: - 5 DELETE queries: issue, comment, project, skill, chat_session - 1 simple UPDATE: UpdateIssueStatus (2 narg, no SET ordering risk) - All callers updated (handlers, service, runtime sweeper fallback) Multi-narg UPDATE queries (UpdateIssue, UpdateProject, UpdateSkill, UpdateComment, UpdateChatSession*) are deferred to a follow-up to keep this change reviewable: each needs its narg pinning shifted and per-caller verification. sqlc was regenerated by hand (no local sqlc toolchain); CI's backend job is the authoritative compile check. * test(security): add workspace_scope_guard regression test Locks in the SQL-layer tenant guard added in this PR. For each of the 6 scoped queries (DeleteIssue, DeleteComment, DeleteProject, DeleteSkill, DeleteChatSession, UpdateIssueStatus), creates the resource in workspace A, invokes the query with a foreign workspace UUID, and asserts the row is untouched (0 rows affected with no error for :exec; pgx.ErrNoRows for :one). A future refactor that drops the workspace_id arg from any of these queries will now fail loudly instead of silently regressing. Includes a sanity sub-test that the in-workspace path still mutates, so a buggy guard that returns no-op for every call would not pass. Co-Authored-By: Claude Opus 4 <noreply@anthropic.com> --------- Co-authored-by: Tom Qiao <tomqiaozc@users.noreply.github.com> Co-authored-by: Claude Opus 4 <noreply@anthropic.com>