The create route seeds show_interval_ms/show_transition_ms from
app_settings through an inline guard that pre-checked Number.isFinite(+v)
but then used parseInt(v). The two disagree for null/''/true — +null is 0
(finite) while parseInt(null) is NaN — so when the slideshow settings rows
are absent (getAppSetting returns its null default), NaN flowed through
Math.min/Math.max into the INSERT. PostgreSQL rejects NaN for integer
columns; SQLite silently stores NULL, which is why every SQLite-based
test passed while POST /api/admin/events 500'd on the PG dev stack and
broke the e2e smoke suite.
Fix: parse first, then check — clampIntOrUndefined in utils/numericHelpers
(unit-tested against every failure-mode input). Verified end-to-end: the
previously-failing minimal create now succeeds against the PG dev stack.
Paul Nothaft