Adding more detail messages for seat blocking

packages/types/src/passenger/blocked-seat-revenue-loss.ts

@@ -91,6 +91,8 @@ export interface BlockedSeatLossSchedule {
   /** `soldSeats / sellableSeats`, as a percentage rounded to one decimal. */
   loadFactorPercent: number;
   blockedSeatCount: number;
+  /** Distinct blockers behind this schedule's blocked seats, in no particular order. */
+  blockedByNames: string[];
   /** Loss at full occupancy — the sum of the fares these seats would have sold for. */
   estimatedLossMinor: number;
   /** `estimatedLossMinor × loadFactor` — what the train's actual demand supports. */
@@ -160,7 +162,8 @@ export interface BlockedSeatRevenueLossReport {
 
 /** Compact roll-up embedded in `GET /dashboard/backoffice-stats`. */
 export interface BlockedSeatRevenueLossStat {
-  periodDays: number;
+  /** `null` means the roll-up covers full history — the earliest schedule to the latest. */
+  periodDays: number | null;
   lossByCurrency: BlockedSeatLossByCurrency[];
   schedulesAffected: number;
   blockedSeatCount: number;