@copilot review

@copilot review

Here's my review of the changes (commit c8873d2):

What changed — Only src/server/services/show-service.ts was modified:

• assignShowCuePointer: Now wrapped in a transaction. When setting a non-null pointer, it loads all other shows, clears the same field in any that have it set (also clearing currentCueTakenAt when the field is currentCueId), saves them, then publishes show.currentCueChanged / show.nextCueChanged events for each cleared show before publishing the event for the target show. Clearing a pointer (setting to null) doesn't touch other shows, which is correct — no global invariant is violated when clearing.

• takeShow: A single pass over all other shows clears currentCueId unconditionally (a take always produces a new non-null current cue) and clears nextCueId only when a non-null followingCueId is being assigned (global uniqueness of the next pointer is only relevant when a cue actually becomes next). All affected rows are saved in one call inside the existing transaction, then cleared events are published before the target show's update events.

• resetShow: Unchanged — clearing a single show's pointers doesn't introduce a duplicate, so no cross-show work is needed.

Correctness notes:

• All DB mutations (clearing other shows + writing the target show) are inside the same transaction, so a mid-operation failure leaves no partial state.
• Realtime events for cleared shows use the cleared show's own showId as the key, so clients subscribed to those shows receive the invalidation signal correctly via the existing showEvents bus.
• entityId?: string is optional in ShowEvent, so passing undefined for cleared shows is type-correct and consistent with other clear-type events in the codebase (e.g., resetShow).
• When followingCueId is null (last cue taken), other shows' nextCueId is intentionally not cleared — no cue is becoming next, so the global-uniqueness invariant isn't triggered.

No issues found. The implementation is minimal, atomic, and correctly propagates realtime events to all affected clients.