8621338c48
app_settings has no created_at column (src/database/db.js defines only
setting_key/value/type + updated_at), so inserting one threw — which
broke saving any FIRST-TIME setting key. Existing keys took the UPDATE
path and worked, hiding the bug; it surfaced on the new VAT-registration
toggle + reclaim-countries keys ("Failed to save accounting settings").
Also fixes the same latent failure on the customer-surface settings route.