fix: rubric:storeData 空保护不覆盖缓存 & getData 回退 DB

electron/main/ipc.ts

@@ -255,11 +255,7 @@ export function setupIpc(win: BrowserWindow): void {
   ipcMain.handle('rubric:storeData', (_event, data: any) => {
     const d = getDb()
     const questions = data?.questions || []
-    // Don't clear rubric data when saving empty data (preserve existing)
-    if (questions.length === 0) {
-      rubricPayload = data
-      return
-    }
+    if (questions.length === 0) return
     d.prepare('DELETE FROM rubric').run()
     const insert = d.prepare('INSERT INTO rubric (question_title, max_score, reference_answer, rubric, sort_order) VALUES (?, ?, ?, ?, ?)')
     for (let i = 0; i < questions.length; i++) {
@@ -270,7 +266,7 @@ export function setupIpc(win: BrowserWindow): void {
   })
 
   ipcMain.handle('rubric:getData', () => {
-    if (rubricPayload) return rubricPayload
+    function fromDb() {
       const d = getDb()
       const rows: any[] = d.prepare('SELECT * FROM rubric ORDER BY sort_order').all()
       if (rows.length) {
@@ -285,6 +281,14 @@ export function setupIpc(win: BrowserWindow): void {
         }
       }
       return null
+    }
+    if (rubricPayload && rubricPayload.questions?.length) return rubricPayload
+    const dbResult = fromDb()
+    if (dbResult) {
+      rubricPayload = dbResult
+      return dbResult
+    }
+    return null
   })
 
   // --- Grading data bridge (toolbar → result window) ---