diff --git a/server/scripts/size-baseline.json b/server/scripts/size-baseline.json
index bd496dab7..555ab0d27 100644
--- a/server/scripts/size-baseline.json
+++ b/server/scripts/size-baseline.json
@@ -17,5 +17,5 @@
   "src/nest/plugins/runtime/plugin-sdk.ts": 1093,
   "src/nest/reservations/reservations.service.ts": 1237,
   "src/nest/trips/trips.service.ts": 1006,
-  "src/nest/vacay/vacay.service.ts": 1416
+  "src/nest/vacay/vacay.service.ts": 1412
 }
diff --git a/server/src/nest/vacay/vacay.helpers.ts b/server/src/nest/vacay/vacay.helpers.ts
index 7396ba80d..f86c90098 100644
--- a/server/src/nest/vacay/vacay.helpers.ts
+++ b/server/src/nest/vacay/vacay.helpers.ts
@@ -69,3 +69,23 @@ export function shiftIsoDate(isoDate: string, days: number): string {
   d.setUTCDate(d.getUTCDate() + days);
   return d.toISOString().slice(0, 10);
 }
+
+export const CACHE_TTL = 24 * 60 * 60 * 1000;
+export const FETCH_TIMEOUT_MS = 10_000;
+// A country's holidays for one year are a few kilobytes; two megabytes means the
+// provider is misbehaving and we would rather report the usual error than buffer it.
+export const MAX_HOLIDAY_BYTES = 2 * 1024 * 1024;
+// Both providers key on a 4-digit year and an ISO 3166-1 alpha-2 code. Anything
+// else has no business reaching the URL path.
+export const YEAR_RE = /^\d{4}$/;
+export const COUNTRY_RE = /^[A-Za-z]{2}$/;
+
+// ---------------------------------------------------------------------------
+// Color palette for auto-assign
+// ---------------------------------------------------------------------------
+
+export const COLORS = [
+  '#6366f1', '#ec4899', '#14b8a6', '#8b5cf6', '#ef4444',
+  '#3b82f6', '#22c55e', '#06b6d4', '#f43f5e', '#a855f7',
+  '#10b981', '#0ea5e9', '#64748b', '#be185d', '#0d9488',
+];
diff --git a/server/src/nest/vacay/vacay.service.ts b/server/src/nest/vacay/vacay.service.ts
index f65beb380..bafdd0873 100644
--- a/server/src/nest/vacay/vacay.service.ts
+++ b/server/src/nest/vacay/vacay.service.ts
@@ -30,7 +30,7 @@ import { SchoolHolidayRegions } from '../../db/entities/SchoolHolidayRegions.ent
 import type { SchoolHolidayRegionsRepository } from '../../db/repositories/SchoolHolidayRegions.repository';
 import {
   daysAlwaysInMonth, isBlockedWeekend, normalizeFraction, normalizeKind, normalizeYearType, pad2, parseAsUtcMillis,
-  shiftIsoDate, windowEndYear,
+  shiftIsoDate, windowEndYear, CACHE_TTL, COLORS, COUNTRY_RE, FETCH_TIMEOUT_MS, MAX_HOLIDAY_BYTES, YEAR_RE,
 } from './vacay.helpers';
 
 // ---------------------------------------------------------------------------
@@ -125,26 +125,6 @@ export interface VacayShare {
   created_at?: string;
 }
 
-const CACHE_TTL = 24 * 60 * 60 * 1000;
-const FETCH_TIMEOUT_MS = 10_000;
-// A country's holidays for one year are a few kilobytes; two megabytes means the
-// provider is misbehaving and we would rather report the usual error than buffer it.
-const MAX_HOLIDAY_BYTES = 2 * 1024 * 1024;
-// Both providers key on a 4-digit year and an ISO 3166-1 alpha-2 code. Anything
-// else has no business reaching the URL path.
-const YEAR_RE = /^\d{4}$/;
-const COUNTRY_RE = /^[A-Za-z]{2}$/;
-
-// ---------------------------------------------------------------------------
-// Color palette for auto-assign
-// ---------------------------------------------------------------------------
-
-const COLORS = [
-  '#6366f1', '#ec4899', '#14b8a6', '#8b5cf6', '#ef4444',
-  '#3b82f6', '#22c55e', '#06b6d4', '#f43f5e', '#a855f7',
-  '#10b981', '#0ea5e9', '#64748b', '#be185d', '#0d9488',
-];
-
 /**
  * Vacay domain service — owns the vacay SQL, now through the ten vacay
  * repositories (+ `SchoolHolidayRegionsRepository`'s cross-domain read,
@@ -1166,13 +1146,7 @@ export class VacayService {
     return { action: 'added', fraction: frac, kind: knd };
   }
 
-  /**
-   * A day written for a year the plan has not opened yet adds that year, with
-   * each member's allowance, the way opening it by hand does. Without it a day
-   * set months ahead (by the assistant, MCP, a plugin or an old client) was
-   * stored but never shown, since the calendar only offers the plan's years.
-   * The year is the writer's leave period that holds the date (#737).
-   */
+  /** A day written for a year the plan has not opened adds that year, or the calendar never shows it (#737 picks the period). */
   private async ensureYearOf(planId: number, userId: number, date: string): Promise<void> {
     const [y, m, d] = date.split('-').map(Number);
     const year = await this.currentPeriodYear(userId, new Date(y, m - 1, d));