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Clicking any meeting row on the Executive Meetings schedule (gated only on canMutate, not editMode) opens a small popover with Move up / Move down / Postpone. Move up/down swap only the (startTime, endTime) tuple between the clicked meeting and its chronological neighbour on the same date — the Time column stays visually anchored to its row position. Backend - POST /executive-meetings/swap-times: transactional swap with FOR UPDATE row locking, optimistic-lock conflict shape (stale_meeting + conflict payload), date/time-window guards, audit logging, and renumberDayByStartTime + day-changed broadcast. - Zod schema in lib/api-zod/src/manual.ts. Frontend - Shared lib/api-json.ts JSON helper. - ScheduleSection.swapTimes does an optimistic (startTime, endTime) swap against the day query cache and rolls back on failure (mirrors the existing inline-edit UX). - MeetingRow uses Popover/PopoverAnchor with skip rules: ARIA roles (button/checkbox/switch/combobox/dialog) and em-time-* / em-edit-* / em-row-grip / em-row-actions data-testid prefixes do NOT open the popover. - PostponeDialog reused from upcoming-meeting-alert.tsx. Tests - Backend swap-times: happy path, stale_meeting (409), different_dates (400), no_time_window (400), unauth (401), viewer-no-mutate (403), malformed-timestamp (400) — all 7 pass. - Hardened expectedUpdatedAt zod schema to z.string().datetime() so malformed tokens fail at validation with a controlled 400 instead of bubbling up as a 500. - E2E: Move up swap, edge-disable states (solo / first / middle / last), Postpone 5-min chip end-to-end, click-exclusion on grip / time cell / row-actions — all 4 pass. Each test uses its own future date to avoid cross-test pollution. Code review approved on second pass. Pre-existing failures in other suites (executive-meetings reorder, font-settings, notes-share, service-orders) are unrelated to this task and predate it. Follow-ups proposed: #487 (keyboard a11y on the popover), #488 (edit- mode test gaps).