feat: exam actions and data safety fixes

docs/scripts/seed-exams.ts

@@ -80,7 +80,12 @@ async function seed() {
     const qId = createId()
     questionIds.push(qId)
     
-    const type = faker.helpers.arrayElement(["single_choice", "multiple_choice", "text", "judgment"])
+    const type = faker.helpers.arrayElement([
+      "single_choice",
+      "multiple_choice",
+      "text",
+      "judgment",
+    ] as const)
     
     await db.insert(questions).values({
       id: qId,
@@ -93,7 +98,7 @@ async function seed() {
           { id: "D", text: faker.lorem.sentence(), isCorrect: false },
         ] : undefined
       },
-      type: type as any,
+      type,
       difficulty: faker.helpers.arrayElement(DIFFICULTY),
       authorId: teacherId,
     })
@@ -105,7 +110,7 @@ async function seed() {
     const examId = createId()
     const subject = faker.helpers.arrayElement(SUBJECTS)
     const grade = faker.helpers.arrayElement(GRADES)
-    const status = faker.helpers.arrayElement(["draft", "published", "archived"])
+    const status = faker.helpers.arrayElement(["draft", "published", "archived"] as const)
     
     const scheduledAt = faker.date.soon({ days: 30 })
 
@@ -126,7 +131,7 @@ async function seed() {
       description: JSON.stringify(meta),
       creatorId: teacherId,
       startTime: scheduledAt,
-      status: status as any,
+      status,
     })
 
     // Link some questions to this exam (random 5 questions)