fix(palace): deleteMemory now decrements wing/room memoryCount

backend/src/modules/palace/palace.test.ts

@@ -198,6 +198,20 @@ describe('Palace Module — Phase N1', () => {
       expect(memB[0].content).toBe('B secret');
     });
 
+    it('deleteMemory decrements wing and room memoryCount', async () => {
+      const wing = await ensureWing(USER_A, PRODUCT, 'ws-1', 'Work');
+      const room = await ensureRoom(USER_A, PRODUCT, wing.id, 'auth');
+
+      const mem = await storeMemory(USER_A, PRODUCT, wing.id, room.id, 'decisions', 'Fact 1');
+      await storeMemory(USER_A, PRODUCT, wing.id, room.id, 'decisions', 'Fact 2');
+
+      // Delete one memory
+      await deleteMemory(USER_A, PRODUCT, mem.id);
+
+      const updatedWing = await getWing(USER_A, PRODUCT, wing.id);
+      expect(updatedWing!.memoryCount).toBe(1);
+    });
+
     it('productId scoping: wrong productId returns empty results', async () => {
       const wing = await ensureWing(USER_A, PRODUCT, 'ws-1', 'Work');
       const room = await ensureRoom(USER_A, PRODUCT, wing.id, 'auth');

backend/src/modules/palace/repository.ts

@@ -261,9 +261,27 @@ export async function deleteMemory(
   const doc = await memoriesCollection().findById(memoryId, userId);
   if (!doc || doc.productId !== productId) return false;
   await memoriesCollection().delete(memoryId, userId);
+  await decrementMemoryCount(userId, doc.wingId, doc.roomId);
   return true;
 }
 
+async function decrementMemoryCount(userId: string, wingId: string, roomId: string): Promise<void> {
+  const wing = await wingsCollection().findById(wingId, userId);
+  if (wing && (wing.memoryCount || 0) > 0) {
+    await wingsCollection().update(wingId, userId, {
+      memoryCount: wing.memoryCount - 1,
+      updatedAt: new Date().toISOString(),
+    });
+  }
+  const room = await roomsCollection().findById(roomId, userId);
+  if (room && (room.memoryCount || 0) > 0) {
+    await roomsCollection().update(roomId, userId, {
+      memoryCount: room.memoryCount - 1,
+      updatedAt: new Date().toISOString(),
+    });
+  }
+}
+
 export async function listMemories(
   userId: string,
   productId: string,