diff --git a/src/shared/db/relations.ts b/src/shared/db/relations.ts
index e36aaa5..3096cc3 100644
--- a/src/shared/db/relations.ts
+++ b/src/shared/db/relations.ts
@@ -35,6 +35,8 @@ import {
   attendanceRecords,
   attendanceRules,
   passwordSecurity,
+  errorBookItems,
+  errorBookReviews,
 } from "./schema";
 
 // --- Users & Roles Relations ---
@@ -55,6 +57,8 @@ export const usersRelations = relations(users, ({ many, one }) => ({
   receivedMessages: many(messages, { relationName: "message_receiver" }),
   notifications: many(messageNotifications),
   passwordSecurity: one(passwordSecurity),
+  errorBookItems: many(errorBookItems),
+  errorBookReviews: many(errorBookReviews),
 }));
 
 export const accountsRelations = relations(accounts, ({ one }) => ({
@@ -103,12 +107,15 @@ export const questionsRelations = relations(questions, ({ one, many }) => ({
   children: many(questions, {
     relationName: "question_hierarchy",
   }),
-  
+
   // Many-to-Many with Knowledge Points (Direct relation mapping)
   knowledgePoints: many(questionsToKnowledgePoints),
-  
+
   // Usage in Exams
   examQuestions: many(examQuestions),
+
+  // Error book items referencing this question
+  errorBookItems: many(errorBookItems),
 }));
 
 export const knowledgePointsRelations = relations(knowledgePoints, ({ one, many }) => ({
@@ -484,3 +491,32 @@ export const passwordSecurityRelations = relations(passwordSecurity, ({ one }) =
     references: [users.id],
   }),
 }));
+
+// --- Error Book Relations ---
+
+export const errorBookItemsRelations = relations(errorBookItems, ({ one, many }) => ({
+  student: one(users, {
+    fields: [errorBookItems.studentId],
+    references: [users.id],
+  }),
+  question: one(questions, {
+    fields: [errorBookItems.questionId],
+    references: [questions.id],
+  }),
+  subject: one(subjects, {
+    fields: [errorBookItems.subjectId],
+    references: [subjects.id],
+  }),
+  reviews: many(errorBookReviews),
+}));
+
+export const errorBookReviewsRelations = relations(errorBookReviews, ({ one }) => ({
+  item: one(errorBookItems, {
+    fields: [errorBookReviews.itemId],
+    references: [errorBookItems.id],
+  }),
+  student: one(users, {
+    fields: [errorBookReviews.studentId],
+    references: [users.id],
+  }),
+}));