Contract-fix interlude (2026-09-26), two bugs from UI's prompts-overhaul
(6edc220):
(a) ORPHAN-400 TRAP: an ON switch whose override file dies orphaned the
record; every agent-section write then 400'd (ON-must-have-file) while
the disabled toggle couldn't reach the OFF escape hatch — a user stuck
unable to write settings. Verified live on 3004 before the fix.
Two-layer fix:
- DELETE /api/settings/prompts/[...segment] now clears the record's
switch in the same operation (switch-first order: a crash between the
two leaves the valid off+file state, never an orphan). Response gains
switchCleared (additive). Overrules the 2026-09-19 switch-survives-
delete note — the delete route and the record agree by construction.
- PUT /api/settings/[section] agent writes HEAL an orphaned ON to OFF
(key dropped) inside the write — never a 400 (defense in depth: disk
wipes outside the app can still orphan). A valid ON with its file
stays valid; the invariant: a user can never get stuck unable to
write settings, and the record never contradicts file reality for
long. Heal logs at info.
(b) TEST WIPES REAL DATA: tests/prompt-overrides.test.ts wiped
data/prompts/ (REAL user override files) in after() and its empty-list
case — every npm test killed actual overrides and orphaned their ON
switches (feeding trap a). Isolated via the established LH_DATA_DIR
seam (mkdtemp + env set before the first config.ts-loading import; all
app-module imports dynamic). after() now snapshots the REAL repo
data/prompts before/after and fails the suite if it changed; the seam is
pinned (writes land under the temp dir).
Pins: delete-clears-switch (incl. idempotent no-op), the exact repro
(disk-level wipe → mirror-the-orphan + tool toggle → 200, healed key,
rest of the write landed), vanished-fragment ON heals, valid ON stays.
Live: the 400-forever write now lands 200, heal info-logged, record
clean.
Gates: 967/967 (+5), typecheck, lint, build green.
amosblomqvist