diff --git a/backend/src/modules/ai/ai-migration-checkpoint.service.spec.ts b/backend/src/modules/ai/ai-migration-checkpoint.service.spec.ts
new file mode 100644
index 00000000..fb18ef11
--- /dev/null
+++ b/backend/src/modules/ai/ai-migration-checkpoint.service.spec.ts
@@ -0,0 +1,91 @@
+// File: src/modules/ai/ai-migration-checkpoint.service.spec.ts
+// Change Log
+// - 2026-05-24: เพิ่ม regression tests สำหรับ migration error enum normalization และ job_id logging.
+
+import { Test, TestingModule } from '@nestjs/testing';
+import { getRepositoryToken } from '@nestjs/typeorm';
+import { DataSource } from 'typeorm';
+import { AiMigrationCheckpointService } from './ai-migration-checkpoint.service';
+import { MigrationProgress } from './entities/migration-progress.entity';
+import { MigrationReviewRecord } from './entities/migration-review.entity';
+
+describe('AiMigrationCheckpointService', () => {
+  const mockProgressRepo = {
+    findOne: jest.fn(),
+    create: jest.fn(),
+    save: jest.fn(),
+  };
+  const mockReviewRepo = {
+    findOne: jest.fn(),
+    create: jest.fn(),
+    save: jest.fn(),
+  };
+  const mockDataSource = {
+    query: jest.fn(),
+    manager: {
+      query: jest.fn(),
+    },
+  };
+
+  let service: AiMigrationCheckpointService;
+
+  beforeEach(async () => {
+    jest.clearAllMocks();
+    mockDataSource.query.mockResolvedValue([{ insertId: 99 }]);
+    const module: TestingModule = await Test.createTestingModule({
+      providers: [
+        AiMigrationCheckpointService,
+        {
+          provide: getRepositoryToken(MigrationProgress),
+          useValue: mockProgressRepo,
+        },
+        {
+          provide: getRepositoryToken(MigrationReviewRecord),
+          useValue: mockReviewRepo,
+        },
+        { provide: DataSource, useValue: mockDataSource },
+      ],
+    }).compile();
+    service = module.get(AiMigrationCheckpointService);
+  });
+
+  it('ควร map AI_JOB_FAILED เป็น API_ERROR และบันทึก job_id', async () => {
+    await expect(
+      service.logError({
+        batchId: 'C22024-MIGRATION',
+        documentNumber: 'LCB-RFA-001',
+        errorType: 'AI_JOB_FAILED',
+        errorMessage: 'AI job failed',
+        jobId: 'job-123',
+      })
+    ).resolves.toEqual({ id: 99 });
+
+    expect(mockDataSource.query).toHaveBeenCalledWith(
+      expect.stringContaining('job_id'),
+      [
+        'C22024-MIGRATION',
+        'LCB-RFA-001',
+        'API_ERROR',
+        'AI job failed',
+        'job-123',
+      ]
+    );
+  });
+
+  it('ควร fallback เป็น UNKNOWN เมื่อ workflow ส่ง error_type ที่ enum ไม่รองรับ', async () => {
+    await service.logError({
+      batchId: 'C22024-MIGRATION',
+      documentNumber: 'WORKFLOW',
+      errorType: 'UNSUPPORTED_ERROR',
+      errorMessage: 'unexpected',
+    });
+
+    expect(mockDataSource.query).toHaveBeenCalledWith(expect.any(String), [
+      'C22024-MIGRATION',
+      'WORKFLOW',
+      'UNKNOWN',
+      'unexpected',
+      null,
+    ]);
+  });
+});
diff --git a/backend/src/modules/ai/ai-migration-checkpoint.service.ts b/backend/src/modules/ai/ai-migration-checkpoint.service.ts
index 88d6c2e6..5bf8a493 100644
--- a/backend/src/modules/ai/ai-migration-checkpoint.service.ts
+++ b/backend/src/modules/ai/ai-migration-checkpoint.service.ts
@@ -2,6 +2,7 @@
 // Change Log:
 // - 2026-05-23: สร้าง service จัดการ Migration Checkpoint, Queue และ Error log ผ่าน API (ADR-023A)
 // - 2026-05-24: เพิ่มฟังก์ชันค้นหาและแปลง UUID เป็นตัวเลข ID จริงใน upsertQueueRecord เพื่อป้องกันการเขียนทับด้วย undefined
+// - 2026-05-24: Normalize migration error type และบันทึก jobId เพื่อป้องกัน DB enum reject
 
 import { Injectable, Logger } from '@nestjs/common';
 import { InjectRepository } from '@nestjs/typeorm';
@@ -28,6 +29,35 @@ export interface CheckpointResponse {
   updatedAt: Date | null;
 }
 
+type MigrationErrorTypeValue =
+  | 'FILE_NOT_FOUND'
+  | 'MISSING_FILENAME'
+  | 'FILE_ERROR'
+  | 'AI_PARSE_ERROR'
+  | 'API_ERROR'
+  | 'DB_ERROR'
+  | 'SECURITY'
+  | 'UNKNOWN';
+
+const MIGRATION_ERROR_TYPE_MAP: Readonly<
+  Record<string, MigrationErrorTypeValue>
+> = {
+  AI_JOB_FAILED: 'API_ERROR',
+  PARSE_ERROR: 'AI_PARSE_ERROR',
+  TOKEN_EXPIRED: 'API_ERROR',
+};
+
+const MIGRATION_ERROR_TYPES = new Set<MigrationErrorTypeValue>([
+  'FILE_NOT_FOUND',
+  'MISSING_FILENAME',
+  'FILE_ERROR',
+  'AI_PARSE_ERROR',
+  'API_ERROR',
+  'DB_ERROR',
+  'SECURITY',
+  'UNKNOWN',
+]);
+
 @Injectable()
 export class AiMigrationCheckpointService {
   private readonly logger = new Logger(AiMigrationCheckpointService.name);
@@ -140,19 +170,31 @@ export class AiMigrationCheckpointService {
    * บันทึก Error Log สำหรับเอกสารที่ประมวลผลไม่สำเร็จ
    */
   async logError(dto: MigrationErrorLogDto): Promise<{ id: number }> {
+    const errorType = this.normalizeMigrationErrorType(dto.errorType);
     const result = await this.dataSource.query<{ insertId: number }[]>(
-      `INSERT INTO migration_errors (batch_id, document_number, error_type, error_message, created_at)
-       VALUES (?, ?, ?, ?, NOW())`,
+      `INSERT INTO migration_errors (batch_id, document_number, error_type, error_message, job_id, created_at)
+       VALUES (?, ?, ?, ?, ?, NOW())`,
       [
         dto.batchId,
         dto.documentNumber,
-        dto.errorType ?? 'UNKNOWN',
+        errorType,
         dto.errorMessage ?? '',
+        dto.jobId ?? null,
       ]
     );
     this.logger.warn(
-      `Error logged — batchId=${dto.batchId} doc=${dto.documentNumber} type=${dto.errorType}`
+      `Error logged — batchId=${dto.batchId} doc=${dto.documentNumber} type=${errorType}`
     );
     return { id: result[0]?.insertId ?? 0 };
   }
+
+  /** แปลง error_type จาก workflow ให้ตรง enum ของ migration_errors */
+  private normalizeMigrationErrorType(
+    errorType?: string
+  ): MigrationErrorTypeValue {
+    const mappedType = errorType
+      ? (MIGRATION_ERROR_TYPE_MAP[errorType] ?? errorType)
+      : 'UNKNOWN';
+    return MIGRATION_ERROR_TYPES.has(mappedType) ? mappedType : 'UNKNOWN';
+  }
 }
diff --git a/backend/src/modules/migration/entities/migration-error.entity.ts b/backend/src/modules/migration/entities/migration-error.entity.ts
index b4e0217a..391c0dcd 100644
--- a/backend/src/modules/migration/entities/migration-error.entity.ts
+++ b/backend/src/modules/migration/entities/migration-error.entity.ts
@@ -38,6 +38,9 @@ export class MigrationError {
   @Column({ name: 'error_message', type: 'text', nullable: true })
   errorMessage?: string;
 
+  @Column({ name: 'job_id', length: 100, nullable: true })
+  jobId?: string;
+
   @Column({ name: 'raw_ai_response', type: 'text', nullable: true })
   rawAiResponse?: string;
 
diff --git a/specs/03-Data-and-Storage/deltas/2026-05-22-drop-migration-tables.rollback.sql b/specs/03-Data-and-Storage/deltas/2026-05-22-drop-migration-tables.rollback.sql
index 2ae5dba2..71c480dd 100644
--- a/specs/03-Data-and-Storage/deltas/2026-05-22-drop-migration-tables.rollback.sql
+++ b/specs/03-Data-and-Storage/deltas/2026-05-22-drop-migration-tables.rollback.sql
@@ -65,9 +65,11 @@ CREATE TABLE IF NOT EXISTS migration_errors (
     'UNKNOWN'
   ),
   error_message TEXT,
+  job_id VARCHAR(100) NULL,
   raw_ai_response TEXT,
   created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
   INDEX idx_batch_id (batch_id),
+  INDEX idx_job_id (job_id),
   INDEX idx_error_type (error_type)
 ) ENGINE = InnoDB DEFAULT CHARSET = utf8mb4 COLLATE = utf8mb4_general_ci COMMENT = 'Migration: Error Log';
 
diff --git a/specs/03-Data-and-Storage/deltas/2026-05-24-add-migration-errors-job-id.rollback.sql b/specs/03-Data-and-Storage/deltas/2026-05-24-add-migration-errors-job-id.rollback.sql
new file mode 100644
index 00000000..4a3fe1dc
--- /dev/null
+++ b/specs/03-Data-and-Storage/deltas/2026-05-24-add-migration-errors-job-id.rollback.sql
@@ -0,0 +1,10 @@
+-- File: specs/03-Data-and-Storage/deltas/2026-05-24-add-migration-errors-job-id.rollback.sql
+-- Change Log:
+-- - 2026-05-24: Rollback สำหรับลบ job_id ออกจาก migration_errors
+
+-- Delta Rollback: ลบคอลัมน์ job_id สำหรับ Migration Error Log
+-- Related ADR: ADR-009, ADR-023A, ADR-028
+
+ALTER TABLE migration_errors
+DROP INDEX idx_migration_errors_job_id,
+DROP COLUMN job_id;
diff --git a/specs/03-Data-and-Storage/deltas/2026-05-24-add-migration-errors-job-id.sql b/specs/03-Data-and-Storage/deltas/2026-05-24-add-migration-errors-job-id.sql
new file mode 100644
index 00000000..6631508a
--- /dev/null
+++ b/specs/03-Data-and-Storage/deltas/2026-05-24-add-migration-errors-job-id.sql
@@ -0,0 +1,11 @@
+-- File: specs/03-Data-and-Storage/deltas/2026-05-24-add-migration-errors-job-id.sql
+-- Change Log:
+-- - 2026-05-24: เพิ่ม job_id ใน migration_errors เพื่อผูก error log กับ BullMQ AI job
+
+-- Delta: เพิ่มคอลัมน์ job_id สำหรับ Migration Error Log
+-- Related ADR: ADR-009, ADR-023A, ADR-028
+
+ALTER TABLE migration_errors
+ADD COLUMN job_id VARCHAR(100) NULL COMMENT 'BullMQ Job ID สำหรับ trace error ของ AI migration'
+AFTER error_message,
+ADD INDEX idx_migration_errors_job_id (job_id);
diff --git a/specs/03-Data-and-Storage/lcbp3-v1.9.0-migration.sql b/specs/03-Data-and-Storage/lcbp3-v1.9.0-migration.sql
index 31f591a4..185d8888 100644
--- a/specs/03-Data-and-Storage/lcbp3-v1.9.0-migration.sql
+++ b/specs/03-Data-and-Storage/lcbp3-v1.9.0-migration.sql
@@ -69,9 +69,11 @@ CREATE TABLE IF NOT EXISTS migration_errors (
     'UNKNOWN'
   ),
   error_message TEXT,
+  job_id VARCHAR(100) NULL,
   raw_ai_response TEXT,
   created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
   INDEX idx_batch_id (batch_id),
+  INDEX idx_job_id (job_id),
   INDEX idx_error_type (error_type)
 ) ENGINE = InnoDB DEFAULT CHARSET = utf8mb4 COLLATE = utf8mb4_general_ci COMMENT = 'Migration: Error Log (ลบได้หลัง Migration เสร็จ)';
 
diff --git a/specs/03-Data-and-Storage/n8n.workflow.v2.json b/specs/03-Data-and-Storage/n8n.workflow.v2.json
index ed42f0ce..b3f3778f 100644
--- a/specs/03-Data-and-Storage/n8n.workflow.v2.json
+++ b/specs/03-Data-and-Storage/n8n.workflow.v2.json
@@ -574,7 +574,7 @@
     },
     {
       "parameters": {
-        "jsCode": "const fs = require('fs');\nconst items = $input.all();\nconst config = $('Set Configuration').first().json.config;\n\nconst csvPath = `${config.LOG_PATH}/error_log_${config.BATCH_ID}.csv`;\nconst header = 'timestamp,document_number,error_type,error_message,job_id\\n';\nconst esc = (s) => `\"${String(s || '').replace(/\"/g, '\"\"')}\"`;\n\nif (!fs.existsSync(csvPath)) {\n  fs.writeFileSync(csvPath, header, 'utf8');\n}\n\nfor (const item of items) {\n  const line = [\n    new Date().toISOString(),\n    esc(item.json.document_number),\n    esc(item.json.error_type || 'UNKNOWN'),\n    esc(item.json.error || item.json.parse_error),\n    esc(item.json.job_id || '')\n  ].join(',') + '\\n';\n  fs.appendFileSync(csvPath, line, 'utf8');\n}\n\nreturn items;"
+        "jsCode": "const fs = require('fs');\nconst items = $input.all();\nconst config = $('Set Configuration').first().json.config;\n\nconst ERROR_TYPE_MAP = {\n  AI_JOB_FAILED: 'API_ERROR',\n  PARSE_ERROR: 'AI_PARSE_ERROR',\n  TOKEN_EXPIRED: 'API_ERROR',\n};\nconst ALLOWED_ERROR_TYPES = new Set([\n  'FILE_NOT_FOUND',\n  'MISSING_FILENAME',\n  'FILE_ERROR',\n  'AI_PARSE_ERROR',\n  'API_ERROR',\n  'DB_ERROR',\n  'SECURITY',\n  'UNKNOWN',\n]);\nconst normalizeErrorType = (type) => {\n  const mappedType = ERROR_TYPE_MAP[type] || type || 'UNKNOWN';\n  return ALLOWED_ERROR_TYPES.has(mappedType) ? mappedType : 'UNKNOWN';\n};\n\nconst csvPath = `${config.LOG_PATH}/error_log_${config.BATCH_ID}.csv`;\nconst header = 'timestamp,document_number,error_type,error_message,job_id\\n';\nconst esc = (s) => `\"${String(s || '').replace(/\"/g, '\"\"')}\"`;\n\nif (!fs.existsSync(csvPath)) {\n  fs.writeFileSync(csvPath, header, 'utf8');\n}\n\nfor (const item of items) {\n  item.json.document_number = item.json.document_number || 'WORKFLOW';\n  item.json.error_type = normalizeErrorType(item.json.error_type);\n  item.json.error = item.json.error || item.json.parse_error || item.json.message || '';\n  item.json.job_id = item.json.job_id || '';\n\n  const line = [\n    new Date().toISOString(),\n    esc(item.json.document_number),\n    esc(item.json.error_type),\n    esc(item.json.error),\n    esc(item.json.job_id)\n  ].join(',') + '\\n';\n  fs.appendFileSync(csvPath, line, 'utf8');\n}\n\nreturn items;"
       },
       "id": "511428dc-3aad-4de1-a9dc-9a87c791371e",
       "name": "Log Error to CSV",
@@ -605,7 +605,7 @@
         },
         "sendBody": true,
         "specifyBody": "json",
-        "jsonBody": "={{ JSON.stringify({ batchId: $('Set Configuration').first().json.config.BATCH_ID, documentNumber: $json.document_number || 'WORKFLOW', errorType: $json.error_type || 'UNKNOWN', errorMessage: $json.error || $json.parse_error || $json.message || '', jobId: $json.job_id || '' }) }}",
+        "jsonBody": "={{ JSON.stringify({ batchId: $('Set Configuration').first().json.config.BATCH_ID, documentNumber: $json.document_number, errorType: $json.error_type, errorMessage: $json.error, jobId: $json.job_id || '' }) }}",
         "options": {
           "timeout": 10000
         }