fix(vacay): a day set for a year the plan has not opened adds that year

The calendar offers only the plan's years, but a vacation day or company
holiday could be written for any date. A day set months ahead, as the
assistant did for 6 January 2027, was stored and counted yet never shown,
because 2027 was not a year of the plan. Writing a day now adds its year,
with every member's allowance, the way opening it by hand does; the year
is the writer's leave period that holds the date. This holds for the app,
MCP, plugins and the assistant alike, since they all write through here.

server/src/nest/vacay/vacay.service.ts

@@ -1150,16 +1150,35 @@ export class VacayService {
       // Removing a stray entry on a blocked day stays possible; keeping one
       // there (converted in place) does not.
       if (weekendBlocked) return { error: 'weekend_blocked' };
-      await this.entries.updateFractionKind(existing.id, frac, knd);
+      await this.uow.transactional(async () => {
+        await this.entries.updateFractionKind(existing.id, frac, knd);
+        await this.ensureYearOf(planId, userId, date);
+      });
       await this.notifyPlanUsers(planId, socketId);
       return { action: 'updated', fraction: frac, kind: knd };
     }
     if (weekendBlocked) return { error: 'weekend_blocked' };
-    await this.entries.insertEntry(planId, userId, date, '', frac, knd);
+    await this.uow.transactional(async () => {
+      await this.entries.insertEntry(planId, userId, date, '', frac, knd);
+      await this.ensureYearOf(planId, userId, date);
+    });
     await this.notifyPlanUsers(planId, socketId);
     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).
+   */
+  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));
+    if (!(await this.years.exists(planId, year))) await this.addYear(planId, year, undefined);
+  }
+
   /**
    * A company holiday on or off, whole or half (#2439). The same click again clears
    * it; the other size converts it in place, the way a vacation entry toggles. A
@@ -1179,6 +1198,8 @@ export class VacayService {
         await this.companyHolidays.insertHoliday(planId, date, note || '', frac); // VC120
       }
       await this.makeRoomForCompanyHoliday(planId, date, frac);
+      const owner = await this.plans.findOwnerId(planId);
+      if (owner) await this.ensureYearOf(planId, owner.owner_id, date);
       return { action: existing ? 'updated' : 'added', fraction: frac };
     });
     await this.notifyPlanUsers(planId, socketId);

server/tests/unit/nest/vacay.service.test.ts

@@ -1875,3 +1875,38 @@ describe('quirk fixes', () => {
     expect(await storedFields(VacayYears, { plan: plan.id, year: year + 1 }, ['id'])).toBeUndefined();
   });
 });
+
+describe('a day written for a year the plan has not opened', () => {
+  it('VACAY-SVC-079: adds that year with the member allowance, so the day shows in the calendar', async () => {
+    const { user, plan } = await setupUserWithPlan();
+    await allowWeekends(plan.id);
+    expect(await svc.listYears(plan.id)).not.toContain(2031);
+
+    const result = await svc.toggleEntry(user.id, plan.id, '2031-01-06', 1, 'vacation');
+
+    expect(result.action).toBe('added');
+    expect(await svc.listYears(plan.id)).toContain(2031);
+    expect(await storedRow(VacayUserYears, { user: user.id, plan: plan.id, year: 2031 })).toBeDefined();
+  });
+
+  it('VACAY-SVC-080: taking the day away again keeps the year it opened', async () => {
+    const { user, plan } = await setupUserWithPlan();
+    await allowWeekends(plan.id);
+    await svc.toggleEntry(user.id, plan.id, '2032-03-02', 1, 'vacation');
+    await svc.deleteYear(plan.id, 2032, undefined);
+    const before = await svc.listYears(plan.id);
+
+    await svc.toggleEntry(user.id, plan.id, '2032-03-02', 1, 'vacation');
+    await svc.toggleEntry(user.id, plan.id, '2032-03-02', 1, 'vacation');
+
+    expect(await svc.listYears(plan.id)).toEqual([...before, 2032].sort((a, b) => a - b));
+  });
+
+  it('VACAY-SVC-081: a company holiday in a year not opened yet adds that year too', async () => {
+    const { plan } = await setupUserWithPlan();
+
+    await svc.toggleCompanyHoliday(plan.id, '2033-12-25', 'Christmas', undefined);
+
+    expect(await svc.listYears(plan.id)).toContain(2033);
+  });
+});