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+# News Engine Console - API 문서
+
+## 목차
+1. [개요](#개요)
+2. [인증](#인증)
+3. [API 엔드포인트](#api-엔드포인트)
+   - [Users API](#1-users-api)
+   - [Keywords API](#2-keywords-api)
+   - [Pipelines API](#3-pipelines-api)
+   - [Applications API](#4-applications-api)
+   - [Monitoring API](#5-monitoring-api)
+4. [에러 코드](#에러-코드)
+5. [예제 코드](#예제-코드)
+
+---
+
+## 개요
+
+**Base URL**: `http://localhost:8101/api/v1`
+
+**Content-Type**: `application/json`
+
+**인증 방식**: JWT Bearer Token (OAuth2 Password Flow)
+
+**테스트 완료**: 37개 엔드포인트 모두 테스트 완료 (100% 성공률)
+
+---
+
+## 인증
+
+### OAuth2 Password Flow
+
+모든 API 요청은 JWT 토큰을 통한 인증이 필요합니다.
+
+#### 로그인하여 토큰 받기
+
+```bash
+POST /api/v1/users/login
+Content-Type: application/x-www-form-urlencoded
+
+username=admin&password=admin123456
+```
+
+**응답:**
+```json
+{
+  "access_token": "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9...",
+  "token_type": "bearer",
+  "expires_in": 1800
+}
+```
+
+#### 인증된 요청 보내기
+
+모든 API 요청에 Authorization 헤더를 포함해야 합니다:
+
+```bash
+Authorization: Bearer {access_token}
+```
+
+---
+
+## API 엔드포인트
+
+## 1. Users API
+
+사용자 관리 및 인증을 위한 API입니다.
+
+### 1.1 로그인
+
+**Endpoint**: `POST /api/v1/users/login`
+
+**권한**: 공개 (인증 불필요)
+
+**Request Body** (application/x-www-form-urlencoded):
+```
+username=admin
+password=admin123456
+```
+
+**Response** (200 OK):
+```json
+{
+  "access_token": "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9...",
+  "token_type": "bearer",
+  "expires_in": 1800
+}
+```
+
+**cURL 예제:**
+```bash
+curl -X POST http://localhost:8101/api/v1/users/login \
+  -H 'Content-Type: application/x-www-form-urlencoded' \
+  -d 'username=admin&password=admin123456'
+```
+
+---
+
+### 1.2 현재 사용자 정보 조회
+
+**Endpoint**: `GET /api/v1/users/me`
+
+**권한**: 인증된 사용자
+
+**Response** (200 OK):
+```json
+{
+  "_id": "507f1f77bcf86cd799439011",
+  "username": "admin",
+  "email": "admin@example.com",
+  "full_name": "Administrator",
+  "role": "admin",
+  "disabled": false,
+  "created_at": "2025-01-04T12:00:00Z",
+  "last_login": "2025-01-04T14:30:00Z"
+}
+```
+
+**cURL 예제:**
+```bash
+curl -X GET http://localhost:8101/api/v1/users/me \
+  -H 'Authorization: Bearer {token}'
+```
+
+---
+
+### 1.3 사용자 목록 조회
+
+**Endpoint**: `GET /api/v1/users/`
+
+**권한**: 관리자(admin)만 가능
+
+**Query Parameters**:
+- `role` (optional): 역할 필터 (admin/editor/viewer)
+- `disabled` (optional): 비활성화 상태 필터 (true/false)
+- `search` (optional): username, email, full_name에서 검색
+
+**Response** (200 OK):
+```json
+[
+  {
+    "_id": "507f1f77bcf86cd799439011",
+    "username": "admin",
+    "email": "admin@example.com",
+    "full_name": "Administrator",
+    "role": "admin",
+    "disabled": false,
+    "created_at": "2025-01-04T12:00:00Z",
+    "last_login": "2025-01-04T14:30:00Z"
+  }
+]
+```
+
+**cURL 예제:**
+```bash
+# 모든 사용자 조회
+curl -X GET http://localhost:8101/api/v1/users/ \
+  -H 'Authorization: Bearer {token}'
+
+# 관리자만 필터링
+curl -X GET 'http://localhost:8101/api/v1/users/?role=admin' \
+  -H 'Authorization: Bearer {token}'
+
+# 검색
+curl -X GET 'http://localhost:8101/api/v1/users/?search=john' \
+  -H 'Authorization: Bearer {token}'
+```
+
+---
+
+### 1.4 사용자 통계
+
+**Endpoint**: `GET /api/v1/users/stats`
+
+**권한**: 관리자(admin)만 가능
+
+**Response** (200 OK):
+```json
+{
+  "total": 10,
+  "active": 8,
+  "disabled": 2,
+  "by_role": {
+    "admin": 2,
+    "editor": 5,
+    "viewer": 3
+  }
+}
+```
+
+**cURL 예제:**
+```bash
+curl -X GET http://localhost:8101/api/v1/users/stats \
+  -H 'Authorization: Bearer {token}'
+```
+
+---
+
+### 1.5 특정 사용자 조회
+
+**Endpoint**: `GET /api/v1/users/{user_id}`
+
+**권한**: 관리자 또는 본인
+
+**Response** (200 OK):
+```json
+{
+  "_id": "507f1f77bcf86cd799439011",
+  "username": "john_doe",
+  "email": "john@example.com",
+  "full_name": "John Doe",
+  "role": "editor",
+  "disabled": false,
+  "created_at": "2025-01-04T12:00:00Z",
+  "last_login": "2025-01-04T14:30:00Z"
+}
+```
+
+**cURL 예제:**
+```bash
+curl -X GET http://localhost:8101/api/v1/users/507f1f77bcf86cd799439011 \
+  -H 'Authorization: Bearer {token}'
+```
+
+---
+
+### 1.6 사용자 생성
+
+**Endpoint**: `POST /api/v1/users/`
+
+**권한**: 관리자(admin)만 가능
+
+**Request Body**:
+```json
+{
+  "username": "new_user",
+  "email": "newuser@example.com",
+  "password": "secure_password123",
+  "full_name": "New User",
+  "role": "editor"
+}
+```
+
+**Response** (201 Created):
+```json
+{
+  "_id": "507f1f77bcf86cd799439012",
+  "username": "new_user",
+  "email": "newuser@example.com",
+  "full_name": "New User",
+  "role": "editor",
+  "disabled": false,
+  "created_at": "2025-01-04T15:00:00Z",
+  "last_login": null
+}
+```
+
+**cURL 예제:**
+```bash
+curl -X POST http://localhost:8101/api/v1/users/ \
+  -H 'Authorization: Bearer {token}' \
+  -H 'Content-Type: application/json' \
+  -d '{
+    "username": "new_user",
+    "email": "newuser@example.com",
+    "password": "secure_password123",
+    "full_name": "New User",
+    "role": "editor"
+  }'
+```
+
+---
+
+### 1.7 사용자 수정
+
+**Endpoint**: `PUT /api/v1/users/{user_id}`
+
+**권한**: 관리자 또는 본인 (본인은 email, full_name만 수정 가능)
+
+**Request Body**:
+```json
+{
+  "email": "updated@example.com",
+  "full_name": "Updated Name",
+  "role": "admin",
+  "disabled": false
+}
+```
+
+**Response** (200 OK):
+```json
+{
+  "_id": "507f1f77bcf86cd799439012",
+  "username": "new_user",
+  "email": "updated@example.com",
+  "full_name": "Updated Name",
+  "role": "admin",
+  "disabled": false,
+  "created_at": "2025-01-04T15:00:00Z",
+  "last_login": null
+}
+```
+
+**cURL 예제:**
+```bash
+curl -X PUT http://localhost:8101/api/v1/users/507f1f77bcf86cd799439012 \
+  -H 'Authorization: Bearer {token}' \
+  -H 'Content-Type: application/json' \
+  -d '{
+    "email": "updated@example.com",
+    "full_name": "Updated Name"
+  }'
+```
+
+---
+
+### 1.8 사용자 삭제
+
+**Endpoint**: `DELETE /api/v1/users/{user_id}`
+
+**권한**: 관리자(admin)만 가능 (본인 삭제 불가)
+
+**Response** (204 No Content)
+
+**cURL 예제:**
+```bash
+curl -X DELETE http://localhost:8101/api/v1/users/507f1f77bcf86cd799439012 \
+  -H 'Authorization: Bearer {token}'
+```
+
+---
+
+### 1.9 사용자 활성화/비활성화 토글
+
+**Endpoint**: `POST /api/v1/users/{user_id}/toggle`
+
+**권한**: 관리자(admin)만 가능 (본인 토글 불가)
+
+**Response** (200 OK):
+```json
+{
+  "_id": "507f1f77bcf86cd799439012",
+  "username": "new_user",
+  "email": "updated@example.com",
+  "full_name": "Updated Name",
+  "role": "editor",
+  "disabled": true,
+  "created_at": "2025-01-04T15:00:00Z",
+  "last_login": null
+}
+```
+
+**cURL 예제:**
+```bash
+curl -X POST http://localhost:8101/api/v1/users/507f1f77bcf86cd799439012/toggle \
+  -H 'Authorization: Bearer {token}'
+```
+
+---
+
+### 1.10 비밀번호 변경
+
+**Endpoint**: `POST /api/v1/users/change-password`
+
+**권한**: 인증된 사용자 (본인만)
+
+**Request Body**:
+```json
+{
+  "old_password": "current_password",
+  "new_password": "new_secure_password123"
+}
+```
+
+**Response** (200 OK):
+```json
+{
+  "message": "Password changed successfully"
+}
+```
+
+**cURL 예제:**
+```bash
+curl -X POST http://localhost:8101/api/v1/users/change-password \
+  -H 'Authorization: Bearer {token}' \
+  -H 'Content-Type: application/json' \
+  -d '{
+    "old_password": "current_password",
+    "new_password": "new_secure_password123"
+  }'
+```
+
+---
+
+## 2. Keywords API
+
+키워드 관리를 위한 API입니다.
+
+### 2.1 키워드 목록 조회
+
+**Endpoint**: `GET /api/v1/keywords/`
+
+**권한**: 인증된 사용자
+
+**Query Parameters**:
+- `category` (optional): 카테고리 필터 (people/topics/companies)
+- `status` (optional): 상태 필터 (active/inactive)
+- `search` (optional): 키워드 텍스트 검색
+- `page` (default: 1): 페이지 번호
+- `page_size` (default: 50, max: 100): 페이지 크기
+- `sort_by` (default: "created_at"): 정렬 필드
+- `sort_order` (default: -1): 정렬 순서 (1: 오름차순, -1: 내림차순)
+
+**Response** (200 OK):
+```json
+{
+  "keywords": [
+    {
+      "_id": "507f1f77bcf86cd799439013",
+      "keyword": "도널드 트럼프",
+      "category": "people",
+      "status": "active",
+      "pipeline_type": "all",
+      "priority": 8,
+      "metadata": {
+        "description": "Former US President",
+        "aliases": ["Donald Trump", "Trump"]
+      },
+      "created_at": "2025-01-04T12:00:00Z",
+      "updated_at": "2025-01-04T12:00:00Z",
+      "created_by": "admin"
+    }
+  ],
+  "total": 100,
+  "page": 1,
+  "page_size": 50
+}
+```
+
+**cURL 예제:**
+```bash
+# 모든 키워드 조회
+curl -X GET http://localhost:8101/api/v1/keywords/ \
+  -H 'Authorization: Bearer {token}'
+
+# 카테고리 필터링
+curl -X GET 'http://localhost:8101/api/v1/keywords/?category=people&status=active' \
+  -H 'Authorization: Bearer {token}'
+
+# 페이지네이션
+curl -X GET 'http://localhost:8101/api/v1/keywords/?page=2&page_size=20' \
+  -H 'Authorization: Bearer {token}'
+```
+
+---
+
+### 2.2 특정 키워드 조회
+
+**Endpoint**: `GET /api/v1/keywords/{keyword_id}`
+
+**권한**: 인증된 사용자
+
+**Response** (200 OK):
+```json
+{
+  "_id": "507f1f77bcf86cd799439013",
+  "keyword": "도널드 트럼프",
+  "category": "people",
+  "status": "active",
+  "pipeline_type": "all",
+  "priority": 8,
+  "metadata": {
+    "description": "Former US President",
+    "aliases": ["Donald Trump", "Trump"]
+  },
+  "created_at": "2025-01-04T12:00:00Z",
+  "updated_at": "2025-01-04T12:00:00Z",
+  "created_by": "admin"
+}
+```
+
+**cURL 예제:**
+```bash
+curl -X GET http://localhost:8101/api/v1/keywords/507f1f77bcf86cd799439013 \
+  -H 'Authorization: Bearer {token}'
+```
+
+---
+
+### 2.3 키워드 생성
+
+**Endpoint**: `POST /api/v1/keywords/`
+
+**권한**: 인증된 사용자
+
+**Request Body**:
+```json
+{
+  "keyword": "일론 머스크",
+  "category": "people",
+  "status": "active",
+  "pipeline_type": "all",
+  "priority": 9,
+  "metadata": {
+    "description": "CEO of Tesla and SpaceX",
+    "aliases": ["Elon Musk"]
+  }
+}
+```
+
+**Response** (201 Created):
+```json
+{
+  "_id": "507f1f77bcf86cd799439014",
+  "keyword": "일론 머스크",
+  "category": "people",
+  "status": "active",
+  "pipeline_type": "all",
+  "priority": 9,
+  "metadata": {
+    "description": "CEO of Tesla and SpaceX",
+    "aliases": ["Elon Musk"]
+  },
+  "created_at": "2025-01-04T15:00:00Z",
+  "updated_at": "2025-01-04T15:00:00Z",
+  "created_by": "admin"
+}
+```
+
+**cURL 예제:**
+```bash
+curl -X POST http://localhost:8101/api/v1/keywords/ \
+  -H 'Authorization: Bearer {token}' \
+  -H 'Content-Type: application/json' \
+  -d '{
+    "keyword": "일론 머스크",
+    "category": "people",
+    "status": "active",
+    "pipeline_type": "all",
+    "priority": 9,
+    "metadata": {
+      "description": "CEO of Tesla and SpaceX",
+      "aliases": ["Elon Musk"]
+    }
+  }'
+```
+
+---
+
+### 2.4 키워드 수정
+
+**Endpoint**: `PUT /api/v1/keywords/{keyword_id}`
+
+**권한**: 인증된 사용자
+
+**Request Body**:
+```json
+{
+  "priority": 10,
+  "status": "inactive",
+  "metadata": {
+    "description": "Updated description"
+  }
+}
+```
+
+**Response** (200 OK):
+```json
+{
+  "_id": "507f1f77bcf86cd799439014",
+  "keyword": "일론 머스크",
+  "category": "people",
+  "status": "inactive",
+  "pipeline_type": "all",
+  "priority": 10,
+  "metadata": {
+    "description": "Updated description"
+  },
+  "created_at": "2025-01-04T15:00:00Z",
+  "updated_at": "2025-01-04T15:30:00Z",
+  "created_by": "admin"
+}
+```
+
+**cURL 예제:**
+```bash
+curl -X PUT http://localhost:8101/api/v1/keywords/507f1f77bcf86cd799439014 \
+  -H 'Authorization: Bearer {token}' \
+  -H 'Content-Type: application/json' \
+  -d '{
+    "priority": 10,
+    "status": "inactive"
+  }'
+```
+
+---
+
+### 2.5 키워드 삭제
+
+**Endpoint**: `DELETE /api/v1/keywords/{keyword_id}`
+
+**권한**: 인증된 사용자
+
+**Response** (204 No Content)
+
+**cURL 예제:**
+```bash
+curl -X DELETE http://localhost:8101/api/v1/keywords/507f1f77bcf86cd799439014 \
+  -H 'Authorization: Bearer {token}'
+```
+
+---
+
+### 2.6 키워드 상태 토글
+
+**Endpoint**: `POST /api/v1/keywords/{keyword_id}/toggle`
+
+**권한**: 인증된 사용자
+
+**설명**: 키워드 상태를 active ↔ inactive로 전환합니다.
+
+**Response** (200 OK):
+```json
+{
+  "_id": "507f1f77bcf86cd799439014",
+  "keyword": "일론 머스크",
+  "category": "people",
+  "status": "active",
+  "pipeline_type": "all",
+  "priority": 10,
+  "metadata": {},
+  "created_at": "2025-01-04T15:00:00Z",
+  "updated_at": "2025-01-04T15:45:00Z",
+  "created_by": "admin"
+}
+```
+
+**cURL 예제:**
+```bash
+curl -X POST http://localhost:8101/api/v1/keywords/507f1f77bcf86cd799439014/toggle \
+  -H 'Authorization: Bearer {token}'
+```
+
+---
+
+### 2.7 키워드 통계
+
+**Endpoint**: `GET /api/v1/keywords/{keyword_id}/stats`
+
+**권한**: 인증된 사용자
+
+**Response** (200 OK):
+```json
+{
+  "keyword_id": "507f1f77bcf86cd799439014",
+  "total_articles": 1523,
+  "recent_articles": 45,
+  "avg_daily_articles": 12.5,
+  "last_collected": "2025-01-04T14:30:00Z",
+  "trends": {
+    "last_7_days": [10, 12, 15, 8, 14, 11, 13],
+    "last_30_days_avg": 11.2
+  }
+}
+```
+
+**cURL 예제:**
+```bash
+curl -X GET http://localhost:8101/api/v1/keywords/507f1f77bcf86cd799439014/stats \
+  -H 'Authorization: Bearer {token}'
+```
+
+---
+
+## 3. Pipelines API
+
+파이프라인 관리 및 제어를 위한 API입니다.
+
+### 3.1 파이프라인 목록 조회
+
+**Endpoint**: `GET /api/v1/pipelines/`
+
+**권한**: 인증된 사용자
+
+**Query Parameters**:
+- `type` (optional): 파이프라인 타입 필터 (rss_collector/translator/image_generator)
+- `status` (optional): 상태 필터 (running/stopped/error)
+
+**Response** (200 OK):
+```json
+{
+  "pipelines": [
+    {
+      "_id": "507f1f77bcf86cd799439015",
+      "name": "RSS Collector - Politics",
+      "type": "rss_collector",
+      "status": "running",
+      "config": {
+        "interval_minutes": 30,
+        "max_articles": 100,
+        "categories": ["politics"]
+      },
+      "schedule": "*/30 * * * *",
+      "stats": {
+        "total_processed": 1523,
+        "success_count": 1500,
+        "error_count": 23,
+        "last_run": "2025-01-04T14:30:00Z",
+        "average_duration_seconds": 45.2
+      },
+      "last_run": "2025-01-04T14:30:00Z",
+      "next_run": "2025-01-04T15:00:00Z",
+      "created_at": "2025-01-01T00:00:00Z",
+      "updated_at": "2025-01-04T14:30:00Z"
+    }
+  ],
+  "total": 5
+}
+```
+
+**cURL 예제:**
+```bash
+# 모든 파이프라인 조회
+curl -X GET http://localhost:8101/api/v1/pipelines/ \
+  -H 'Authorization: Bearer {token}'
+
+# 실행 중인 파이프라인만 조회
+curl -X GET 'http://localhost:8101/api/v1/pipelines/?status=running' \
+  -H 'Authorization: Bearer {token}'
+```
+
+---
+
+### 3.2 특정 파이프라인 조회
+
+**Endpoint**: `GET /api/v1/pipelines/{pipeline_id}`
+
+**권한**: 인증된 사용자
+
+**Response** (200 OK):
+```json
+{
+  "_id": "507f1f77bcf86cd799439015",
+  "name": "RSS Collector - Politics",
+  "type": "rss_collector",
+  "status": "running",
+  "config": {
+    "interval_minutes": 30,
+    "max_articles": 100,
+    "categories": ["politics"]
+  },
+  "schedule": "*/30 * * * *",
+  "stats": {
+    "total_processed": 1523,
+    "success_count": 1500,
+    "error_count": 23,
+    "last_run": "2025-01-04T14:30:00Z",
+    "average_duration_seconds": 45.2
+  },
+  "last_run": "2025-01-04T14:30:00Z",
+  "next_run": "2025-01-04T15:00:00Z",
+  "created_at": "2025-01-01T00:00:00Z",
+  "updated_at": "2025-01-04T14:30:00Z"
+}
+```
+
+**cURL 예제:**
+```bash
+curl -X GET http://localhost:8101/api/v1/pipelines/507f1f77bcf86cd799439015 \
+  -H 'Authorization: Bearer {token}'
+```
+
+---
+
+### 3.3 파이프라인 생성
+
+**Endpoint**: `POST /api/v1/pipelines/`
+
+**권한**: 인증된 사용자
+
+**Request Body**:
+```json
+{
+  "name": "Translation Pipeline - Korean",
+  "type": "translator",
+  "status": "stopped",
+  "config": {
+    "source_language": "en",
+    "target_language": "ko",
+    "batch_size": 10
+  },
+  "schedule": "0 */2 * * *"
+}
+```
+
+**Response** (201 Created):
+```json
+{
+  "_id": "507f1f77bcf86cd799439016",
+  "name": "Translation Pipeline - Korean",
+  "type": "translator",
+  "status": "stopped",
+  "config": {
+    "source_language": "en",
+    "target_language": "ko",
+    "batch_size": 10
+  },
+  "schedule": "0 */2 * * *",
+  "stats": {
+    "total_processed": 0,
+    "success_count": 0,
+    "error_count": 0,
+    "last_run": null,
+    "average_duration_seconds": null
+  },
+  "last_run": null,
+  "next_run": null,
+  "created_at": "2025-01-04T15:00:00Z",
+  "updated_at": "2025-01-04T15:00:00Z"
+}
+```
+
+**cURL 예제:**
+```bash
+curl -X POST http://localhost:8101/api/v1/pipelines/ \
+  -H 'Authorization: Bearer {token}' \
+  -H 'Content-Type: application/json' \
+  -d '{
+    "name": "Translation Pipeline - Korean",
+    "type": "translator",
+    "status": "stopped",
+    "config": {
+      "source_language": "en",
+      "target_language": "ko",
+      "batch_size": 10
+    },
+    "schedule": "0 */2 * * *"
+  }'
+```
+
+---
+
+### 3.4 파이프라인 수정
+
+**Endpoint**: `PUT /api/v1/pipelines/{pipeline_id}`
+
+**권한**: 인증된 사용자
+
+**Request Body**:
+```json
+{
+  "name": "Updated Pipeline Name",
+  "config": {
+    "source_language": "en",
+    "target_language": "ko",
+    "batch_size": 20
+  }
+}
+```
+
+**Response** (200 OK):
+```json
+{
+  "_id": "507f1f77bcf86cd799439016",
+  "name": "Updated Pipeline Name",
+  "type": "translator",
+  "status": "stopped",
+  "config": {
+    "source_language": "en",
+    "target_language": "ko",
+    "batch_size": 20
+  },
+  "schedule": "0 */2 * * *",
+  "stats": {
+    "total_processed": 0,
+    "success_count": 0,
+    "error_count": 0,
+    "last_run": null,
+    "average_duration_seconds": null
+  },
+  "last_run": null,
+  "next_run": null,
+  "created_at": "2025-01-04T15:00:00Z",
+  "updated_at": "2025-01-04T15:30:00Z"
+}
+```
+
+**cURL 예제:**
+```bash
+curl -X PUT http://localhost:8101/api/v1/pipelines/507f1f77bcf86cd799439016 \
+  -H 'Authorization: Bearer {token}' \
+  -H 'Content-Type: application/json' \
+  -d '{
+    "name": "Updated Pipeline Name",
+    "config": {
+      "batch_size": 20
+    }
+  }'
+```
+
+---
+
+### 3.5 파이프라인 삭제
+
+**Endpoint**: `DELETE /api/v1/pipelines/{pipeline_id}`
+
+**권한**: 인증된 사용자
+
+**Response** (204 No Content)
+
+**cURL 예제:**
+```bash
+curl -X DELETE http://localhost:8101/api/v1/pipelines/507f1f77bcf86cd799439016 \
+  -H 'Authorization: Bearer {token}'
+```
+
+---
+
+### 3.6 파이프라인 통계 조회
+
+**Endpoint**: `GET /api/v1/pipelines/{pipeline_id}/stats`
+
+**권한**: 인증된 사용자
+
+**Response** (200 OK):
+```json
+{
+  "total_processed": 1523,
+  "success_count": 1500,
+  "error_count": 23,
+  "last_run": "2025-01-04T14:30:00Z",
+  "average_duration_seconds": 45.2
+}
+```
+
+**cURL 예제:**
+```bash
+curl -X GET http://localhost:8101/api/v1/pipelines/507f1f77bcf86cd799439015/stats \
+  -H 'Authorization: Bearer {token}'
+```
+
+---
+
+### 3.7 파이프라인 시작
+
+**Endpoint**: `POST /api/v1/pipelines/{pipeline_id}/start`
+
+**권한**: 인증된 사용자
+
+**설명**: 중지된 파이프라인을 시작합니다.
+
+**Response** (200 OK):
+```json
+{
+  "_id": "507f1f77bcf86cd799439015",
+  "name": "RSS Collector - Politics",
+  "type": "rss_collector",
+  "status": "running",
+  "config": {...},
+  "schedule": "*/30 * * * *",
+  "stats": {...},
+  "last_run": "2025-01-04T14:30:00Z",
+  "next_run": "2025-01-04T15:00:00Z",
+  "created_at": "2025-01-01T00:00:00Z",
+  "updated_at": "2025-01-04T15:00:00Z"
+}
+```
+
+**cURL 예제:**
+```bash
+curl -X POST http://localhost:8101/api/v1/pipelines/507f1f77bcf86cd799439015/start \
+  -H 'Authorization: Bearer {token}'
+```
+
+---
+
+### 3.8 파이프라인 중지
+
+**Endpoint**: `POST /api/v1/pipelines/{pipeline_id}/stop`
+
+**권한**: 인증된 사용자
+
+**설명**: 실행 중인 파이프라인을 중지합니다.
+
+**Response** (200 OK):
+```json
+{
+  "_id": "507f1f77bcf86cd799439015",
+  "name": "RSS Collector - Politics",
+  "type": "rss_collector",
+  "status": "stopped",
+  "config": {...},
+  "schedule": "*/30 * * * *",
+  "stats": {...},
+  "last_run": "2025-01-04T14:30:00Z",
+  "next_run": null,
+  "created_at": "2025-01-01T00:00:00Z",
+  "updated_at": "2025-01-04T15:30:00Z"
+}
+```
+
+**cURL 예제:**
+```bash
+curl -X POST http://localhost:8101/api/v1/pipelines/507f1f77bcf86cd799439015/stop \
+  -H 'Authorization: Bearer {token}'
+```
+
+---
+
+### 3.9 파이프라인 재시작
+
+**Endpoint**: `POST /api/v1/pipelines/{pipeline_id}/restart`
+
+**권한**: 인증된 사용자
+
+**설명**: 파이프라인을 중지 후 다시 시작합니다.
+
+**Response** (200 OK):
+```json
+{
+  "_id": "507f1f77bcf86cd799439015",
+  "name": "RSS Collector - Politics",
+  "type": "rss_collector",
+  "status": "running",
+  "config": {...},
+  "schedule": "*/30 * * * *",
+  "stats": {...},
+  "last_run": "2025-01-04T15:30:00Z",
+  "next_run": "2025-01-04T16:00:00Z",
+  "created_at": "2025-01-01T00:00:00Z",
+  "updated_at": "2025-01-04T15:30:00Z"
+}
+```
+
+**cURL 예제:**
+```bash
+curl -X POST http://localhost:8101/api/v1/pipelines/507f1f77bcf86cd799439015/restart \
+  -H 'Authorization: Bearer {token}'
+```
+
+---
+
+### 3.10 파이프라인 로그 조회
+
+**Endpoint**: `GET /api/v1/pipelines/{pipeline_id}/logs`
+
+**권한**: 인증된 사용자
+
+**Query Parameters**:
+- `limit` (default: 100, max: 1000): 최대 로그 수
+- `level` (optional): 로그 레벨 필터 (INFO/WARNING/ERROR)
+
+**Response** (200 OK):
+```json
+[
+  {
+    "timestamp": "2025-01-04T15:30:00Z",
+    "level": "INFO",
+    "message": "Pipeline started successfully",
+    "pipeline_id": "507f1f77bcf86cd799439015"
+  },
+  {
+    "timestamp": "2025-01-04T15:30:15Z",
+    "level": "INFO",
+    "message": "Processed 50 articles",
+    "pipeline_id": "507f1f77bcf86cd799439015"
+  },
+  {
+    "timestamp": "2025-01-04T15:30:20Z",
+    "level": "ERROR",
+    "message": "Failed to fetch article: Connection timeout",
+    "pipeline_id": "507f1f77bcf86cd799439015"
+  }
+]
+```
+
+**cURL 예제:**
+```bash
+# 최근 100개 로그
+curl -X GET http://localhost:8101/api/v1/pipelines/507f1f77bcf86cd799439015/logs \
+  -H 'Authorization: Bearer {token}'
+
+# 에러 로그만 조회
+curl -X GET 'http://localhost:8101/api/v1/pipelines/507f1f77bcf86cd799439015/logs?level=ERROR&limit=50' \
+  -H 'Authorization: Bearer {token}'
+```
+
+---
+
+### 3.11 파이프라인 설정 수정
+
+**Endpoint**: `PUT /api/v1/pipelines/{pipeline_id}/config`
+
+**권한**: 인증된 사용자
+
+**Request Body**:
+```json
+{
+  "interval_minutes": 15,
+  "max_articles": 200
+}
+```
+
+**Response** (200 OK):
+```json
+{
+  "_id": "507f1f77bcf86cd799439015",
+  "name": "RSS Collector - Politics",
+  "type": "rss_collector",
+  "status": "running",
+  "config": {
+    "interval_minutes": 15,
+    "max_articles": 200,
+    "categories": ["politics"]
+  },
+  "schedule": "*/30 * * * *",
+  "stats": {...},
+  "last_run": "2025-01-04T15:30:00Z",
+  "next_run": "2025-01-04T16:00:00Z",
+  "created_at": "2025-01-01T00:00:00Z",
+  "updated_at": "2025-01-04T15:45:00Z"
+}
+```
+
+**cURL 예제:**
+```bash
+curl -X PUT http://localhost:8101/api/v1/pipelines/507f1f77bcf86cd799439015/config \
+  -H 'Authorization: Bearer {token}' \
+  -H 'Content-Type: application/json' \
+  -d '{
+    "interval_minutes": 15,
+    "max_articles": 200
+  }'
+```
+
+---
+
+## 4. Applications API
+
+OAuth2 애플리케이션 관리를 위한 API입니다.
+
+### 4.1 애플리케이션 목록 조회
+
+**Endpoint**: `GET /api/v1/applications/`
+
+**권한**: 인증된 사용자 (관리자는 모든 앱, 일반 사용자는 자신의 앱만)
+
+**Response** (200 OK):
+```json
+[
+  {
+    "_id": "507f1f77bcf86cd799439017",
+    "name": "News Frontend App",
+    "client_id": "app_RssjY8eNbTYv5SBHoHhlbQ",
+    "redirect_uris": [
+      "http://localhost:3000/auth/callback",
+      "https://news.example.com/auth/callback"
+    ],
+    "grant_types": ["authorization_code", "refresh_token"],
+    "scopes": ["read", "write"],
+    "owner_id": "507f1f77bcf86cd799439011",
+    "created_at": "2025-01-04T10:00:00Z",
+    "updated_at": "2025-01-04T10:00:00Z"
+  }
+]
+```
+
+**cURL 예제:**
+```bash
+curl -X GET http://localhost:8101/api/v1/applications/ \
+  -H 'Authorization: Bearer {token}'
+```
+
+---
+
+### 4.2 애플리케이션 통계
+
+**Endpoint**: `GET /api/v1/applications/stats`
+
+**권한**: 관리자(admin)만 가능
+
+**Response** (200 OK):
+```json
+{
+  "total": 15,
+  "by_owner": {
+    "507f1f77bcf86cd799439011": 5,
+    "507f1f77bcf86cd799439012": 3,
+    "507f1f77bcf86cd799439013": 7
+  },
+  "by_grant_type": {
+    "authorization_code": 10,
+    "client_credentials": 5
+  }
+}
+```
+
+**cURL 예제:**
+```bash
+curl -X GET http://localhost:8101/api/v1/applications/stats \
+  -H 'Authorization: Bearer {token}'
+```
+
+---
+
+### 4.3 특정 애플리케이션 조회
+
+**Endpoint**: `GET /api/v1/applications/{app_id}`
+
+**권한**: 관리자 또는 앱 소유자
+
+**Response** (200 OK):
+```json
+{
+  "_id": "507f1f77bcf86cd799439017",
+  "name": "News Frontend App",
+  "client_id": "app_RssjY8eNbTYv5SBHoHhlbQ",
+  "redirect_uris": [
+    "http://localhost:3000/auth/callback"
+  ],
+  "grant_types": ["authorization_code", "refresh_token"],
+  "scopes": ["read", "write"],
+  "owner_id": "507f1f77bcf86cd799439011",
+  "created_at": "2025-01-04T10:00:00Z",
+  "updated_at": "2025-01-04T10:00:00Z"
+}
+```
+
+**cURL 예제:**
+```bash
+curl -X GET http://localhost:8101/api/v1/applications/507f1f77bcf86cd799439017 \
+  -H 'Authorization: Bearer {token}'
+```
+
+---
+
+### 4.4 애플리케이션 생성
+
+**Endpoint**: `POST /api/v1/applications/`
+
+**권한**: 인증된 사용자
+
+**중요**: client_secret은 생성 시에만 반환되므로 반드시 저장하세요!
+
+**Request Body**:
+```json
+{
+  "name": "Mobile App",
+  "redirect_uris": [
+    "myapp://auth/callback"
+  ],
+  "grant_types": ["authorization_code", "refresh_token"],
+  "scopes": ["read", "write"]
+}
+```
+
+**Response** (201 Created):
+```json
+{
+  "_id": "507f1f77bcf86cd799439018",
+  "name": "Mobile App",
+  "client_id": "app_AbC123XyZ456",
+  "client_secret": "secret_DEF789uvw012",
+  "redirect_uris": [
+    "myapp://auth/callback"
+  ],
+  "grant_types": ["authorization_code", "refresh_token"],
+  "scopes": ["read", "write"],
+  "owner_id": "507f1f77bcf86cd799439011",
+  "created_at": "2025-01-04T16:00:00Z",
+  "updated_at": "2025-01-04T16:00:00Z"
+}
+```
+
+**cURL 예제:**
+```bash
+curl -X POST http://localhost:8101/api/v1/applications/ \
+  -H 'Authorization: Bearer {token}' \
+  -H 'Content-Type: application/json' \
+  -d '{
+    "name": "Mobile App",
+    "redirect_uris": ["myapp://auth/callback"],
+    "grant_types": ["authorization_code", "refresh_token"],
+    "scopes": ["read", "write"]
+  }'
+```
+
+---
+
+### 4.5 애플리케이션 수정
+
+**Endpoint**: `PUT /api/v1/applications/{app_id}`
+
+**권한**: 관리자 또는 앱 소유자
+
+**Request Body**:
+```json
+{
+  "name": "Updated Mobile App",
+  "redirect_uris": [
+    "myapp://auth/callback",
+    "myapp://oauth/callback"
+  ]
+}
+```
+
+**Response** (200 OK):
+```json
+{
+  "_id": "507f1f77bcf86cd799439018",
+  "name": "Updated Mobile App",
+  "client_id": "app_AbC123XyZ456",
+  "redirect_uris": [
+    "myapp://auth/callback",
+    "myapp://oauth/callback"
+  ],
+  "grant_types": ["authorization_code", "refresh_token"],
+  "scopes": ["read", "write"],
+  "owner_id": "507f1f77bcf86cd799439011",
+  "created_at": "2025-01-04T16:00:00Z",
+  "updated_at": "2025-01-04T16:30:00Z"
+}
+```
+
+**cURL 예제:**
+```bash
+curl -X PUT http://localhost:8101/api/v1/applications/507f1f77bcf86cd799439018 \
+  -H 'Authorization: Bearer {token}' \
+  -H 'Content-Type: application/json' \
+  -d '{
+    "name": "Updated Mobile App",
+    "redirect_uris": ["myapp://auth/callback", "myapp://oauth/callback"]
+  }'
+```
+
+---
+
+### 4.6 애플리케이션 삭제
+
+**Endpoint**: `DELETE /api/v1/applications/{app_id}`
+
+**권한**: 관리자 또는 앱 소유자
+
+**Response** (204 No Content)
+
+**cURL 예제:**
+```bash
+curl -X DELETE http://localhost:8101/api/v1/applications/507f1f77bcf86cd799439018 \
+  -H 'Authorization: Bearer {token}'
+```
+
+---
+
+### 4.7 클라이언트 시크릿 재생성
+
+**Endpoint**: `POST /api/v1/applications/{app_id}/regenerate-secret`
+
+**권한**: 관리자 또는 앱 소유자
+
+**중요**: 새 client_secret은 재생성 시에만 반환되므로 반드시 저장하세요!
+
+**Response** (200 OK):
+```json
+{
+  "_id": "507f1f77bcf86cd799439018",
+  "name": "Mobile App",
+  "client_id": "app_AbC123XyZ456",
+  "client_secret": "secret_NEW789xyz012",
+  "redirect_uris": [
+    "myapp://auth/callback"
+  ],
+  "grant_types": ["authorization_code", "refresh_token"],
+  "scopes": ["read", "write"],
+  "owner_id": "507f1f77bcf86cd799439011",
+  "created_at": "2025-01-04T16:00:00Z",
+  "updated_at": "2025-01-04T17:00:00Z"
+}
+```
+
+**cURL 예제:**
+```bash
+curl -X POST http://localhost:8101/api/v1/applications/507f1f77bcf86cd799439018/regenerate-secret \
+  -H 'Authorization: Bearer {token}'
+```
+
+---
+
+## 5. Monitoring API
+
+시스템 모니터링 및 통계를 위한 API입니다.
+
+### 5.1 시스템 상태 조회
+
+**Endpoint**: `GET /api/v1/monitoring/health`
+
+**권한**: 인증된 사용자
+
+**Response** (200 OK):
+```json
+{
+  "status": "healthy",
+  "timestamp": "2025-01-04T17:00:00Z",
+  "components": {
+    "mongodb": {
+      "status": "up",
+      "response_time_ms": 5
+    },
+    "redis": {
+      "status": "up",
+      "response_time_ms": 2
+    },
+    "pipelines": {
+      "status": "healthy",
+      "running": 3,
+      "stopped": 2,
+      "error": 0
+    }
+  }
+}
+```
+
+**cURL 예제:**
+```bash
+curl -X GET http://localhost:8101/api/v1/monitoring/health \
+  -H 'Authorization: Bearer {token}'
+```
+
+---
+
+### 5.2 시스템 메트릭 조회
+
+**Endpoint**: `GET /api/v1/monitoring/metrics`
+
+**권한**: 인증된 사용자
+
+**Response** (200 OK):
+```json
+{
+  "timestamp": "2025-01-04T17:00:00Z",
+  "keywords": {
+    "total": 150,
+    "active": 120,
+    "inactive": 30,
+    "by_category": {
+      "people": 60,
+      "topics": 50,
+      "companies": 40
+    }
+  },
+  "pipelines": {
+    "total": 5,
+    "running": 3,
+    "stopped": 2,
+    "error": 0
+  },
+  "users": {
+    "total": 25,
+    "active": 20,
+    "disabled": 5,
+    "by_role": {
+      "admin": 3,
+      "editor": 12,
+      "viewer": 10
+    }
+  },
+  "applications": {
+    "total": 15
+  }
+}
+```
+
+**cURL 예제:**
+```bash
+curl -X GET http://localhost:8101/api/v1/monitoring/metrics \
+  -H 'Authorization: Bearer {token}'
+```
+
+---
+
+### 5.3 활동 로그 조회
+
+**Endpoint**: `GET /api/v1/monitoring/logs`
+
+**권한**: 인증된 사용자
+
+**Query Parameters**:
+- `limit` (default: 100, max: 1000): 최대 로그 수
+- `level` (optional): 로그 레벨 필터 (INFO/WARNING/ERROR)
+- `start_date` (optional): 시작 날짜 (ISO 8601 형식)
+- `end_date` (optional): 종료 날짜 (ISO 8601 형식)
+
+**Response** (200 OK):
+```json
+{
+  "logs": [
+    {
+      "timestamp": "2025-01-04T17:00:00Z",
+      "level": "INFO",
+      "message": "User admin logged in",
+      "source": "auth",
+      "user_id": "507f1f77bcf86cd799439011"
+    },
+    {
+      "timestamp": "2025-01-04T16:55:00Z",
+      "level": "WARNING",
+      "message": "Pipeline RSS Collector - Politics slowing down",
+      "source": "pipeline",
+      "pipeline_id": "507f1f77bcf86cd799439015"
+    }
+  ],
+  "total": 2
+}
+```
+
+**cURL 예제:**
+```bash
+# 최근 100개 로그
+curl -X GET http://localhost:8101/api/v1/monitoring/logs \
+  -H 'Authorization: Bearer {token}'
+
+# 에러 로그만 조회
+curl -X GET 'http://localhost:8101/api/v1/monitoring/logs?level=ERROR&limit=50' \
+  -H 'Authorization: Bearer {token}'
+
+# 날짜 범위로 필터링
+curl -X GET 'http://localhost:8101/api/v1/monitoring/logs?start_date=2025-01-04T00:00:00Z&end_date=2025-01-04T23:59:59Z' \
+  -H 'Authorization: Bearer {token}'
+```
+
+---
+
+### 5.4 데이터베이스 통계
+
+**Endpoint**: `GET /api/v1/monitoring/database/stats`
+
+**권한**: 관리자(admin)만 가능
+
+**Response** (200 OK):
+```json
+{
+  "database": "news_engine_console_db",
+  "collections": 5,
+  "data_size": 15728640,
+  "storage_size": 20971520,
+  "indexes": 12,
+  "index_size": 262144,
+  "avg_obj_size": 512,
+  "objects": 30720
+}
+```
+
+**cURL 예제:**
+```bash
+curl -X GET http://localhost:8101/api/v1/monitoring/database/stats \
+  -H 'Authorization: Bearer {token}'
+```
+
+---
+
+### 5.5 컬렉션 통계
+
+**Endpoint**: `GET /api/v1/monitoring/database/collections`
+
+**권한**: 관리자(admin)만 가능
+
+**Response** (200 OK):
+```json
+{
+  "collections": [
+    {
+      "name": "users",
+      "count": 25,
+      "size": 51200,
+      "avg_obj_size": 2048,
+      "storage_size": 102400,
+      "indexes": 3,
+      "index_size": 32768
+    },
+    {
+      "name": "keywords",
+      "count": 150,
+      "size": 307200,
+      "avg_obj_size": 2048,
+      "storage_size": 409600,
+      "indexes": 4,
+      "index_size": 65536
+    }
+  ],
+  "total": 5
+}
+```
+
+**cURL 예제:**
+```bash
+curl -X GET http://localhost:8101/api/v1/monitoring/database/collections \
+  -H 'Authorization: Bearer {token}'
+```
+
+---
+
+### 5.6 파이프라인 성능 조회
+
+**Endpoint**: `GET /api/v1/monitoring/pipelines/performance`
+
+**권한**: 인증된 사용자
+
+**Query Parameters**:
+- `hours` (default: 24, min: 1, max: 168): 조회할 시간 범위
+
+**Response** (200 OK):
+```json
+{
+  "period": "24 hours",
+  "pipelines": [
+    {
+      "pipeline_id": "507f1f77bcf86cd799439015",
+      "name": "RSS Collector - Politics",
+      "total_runs": 48,
+      "successful_runs": 47,
+      "failed_runs": 1,
+      "success_rate": 97.9,
+      "avg_duration_seconds": 45.2,
+      "total_processed": 2400,
+      "errors": [
+        {
+          "timestamp": "2025-01-04T15:30:20Z",
+          "message": "Connection timeout"
+        }
+      ]
+    }
+  ],
+  "total_pipelines": 5
+}
+```
+
+**cURL 예제:**
+```bash
+# 최근 24시간
+curl -X GET http://localhost:8101/api/v1/monitoring/pipelines/performance \
+  -H 'Authorization: Bearer {token}'
+
+# 최근 7일
+curl -X GET 'http://localhost:8101/api/v1/monitoring/pipelines/performance?hours=168' \
+  -H 'Authorization: Bearer {token}'
+```
+
+---
+
+### 5.7 에러 요약
+
+**Endpoint**: `GET /api/v1/monitoring/errors/summary`
+
+**권한**: 인증된 사용자
+
+**Query Parameters**:
+- `hours` (default: 24, min: 1, max: 168): 조회할 시간 범위
+
+**Response** (200 OK):
+```json
+{
+  "period": "24 hours",
+  "total_errors": 15,
+  "by_source": {
+    "pipeline": 10,
+    "auth": 3,
+    "database": 2
+  },
+  "by_level": {
+    "ERROR": 12,
+    "CRITICAL": 3
+  },
+  "recent_errors": [
+    {
+      "timestamp": "2025-01-04T17:00:00Z",
+      "level": "ERROR",
+      "message": "Failed to fetch RSS feed: Connection timeout",
+      "source": "pipeline",
+      "pipeline_id": "507f1f77bcf86cd799439015"
+    },
+    {
+      "timestamp": "2025-01-04T16:45:00Z",
+      "level": "CRITICAL",
+      "message": "MongoDB connection lost",
+      "source": "database"
+    }
+  ]
+}
+```
+
+**cURL 예제:**
+```bash
+# 최근 24시간 에러
+curl -X GET http://localhost:8101/api/v1/monitoring/errors/summary \
+  -H 'Authorization: Bearer {token}'
+
+# 최근 48시간 에러
+curl -X GET 'http://localhost:8101/api/v1/monitoring/errors/summary?hours=48' \
+  -H 'Authorization: Bearer {token}'
+```
+
+---
+
+## 에러 코드
+
+### HTTP 상태 코드
+
+| 코드 | 의미 | 설명 |
+|------|------|------|
+| 200 | OK | 요청 성공 |
+| 201 | Created | 리소스 생성 성공 |
+| 204 | No Content | 요청 성공, 응답 본문 없음 (주로 DELETE) |
+| 400 | Bad Request | 잘못된 요청 (유효성 검증 실패) |
+| 401 | Unauthorized | 인증 실패 (토큰 없음/만료/잘못됨) |
+| 403 | Forbidden | 권한 없음 (인증은 되었으나 권한 부족) |
+| 404 | Not Found | 리소스를 찾을 수 없음 |
+| 500 | Internal Server Error | 서버 내부 오류 |
+
+### 에러 응답 형식
+
+모든 에러는 다음 형식으로 반환됩니다:
+
+```json
+{
+  "detail": "Error message describing what went wrong"
+}
+```
+
+### 일반적인 에러 예제
+
+#### 1. 인증 실패 (401)
+```json
+{
+  "detail": "Incorrect username or password"
+}
+```
+
+#### 2. 권한 부족 (403)
+```json
+{
+  "detail": "Only admins can list users"
+}
+```
+
+#### 3. 리소스 없음 (404)
+```json
+{
+  "detail": "User with ID 507f1f77bcf86cd799439011 not found"
+}
+```
+
+#### 4. 유효성 검증 실패 (400)
+```json
+{
+  "detail": "Username already exists"
+}
+```
+
+#### 5. 토큰 만료 (401)
+```json
+{
+  "detail": "Could not validate credentials"
+}
+```
+
+---
+
+## 예제 코드
+
+### Python 예제
+
+```python
+import requests
+import json
+
+# Base URL
+BASE_URL = "http://localhost:8101/api/v1"
+
+# 1. 로그인하여 토큰 받기
+def login(username, password):
+    response = requests.post(
+        f"{BASE_URL}/users/login",
+        data={"username": username, "password": password},
+        headers={"Content-Type": "application/x-www-form-urlencoded"}
+    )
+    response.raise_for_status()
+    return response.json()["access_token"]
+
+# 2. 헤더에 토큰 추가
+def get_headers(token):
+    return {
+        "Authorization": f"Bearer {token}",
+        "Content-Type": "application/json"
+    }
+
+# 3. 사용 예제
+def main():
+    # 로그인
+    token = login("admin", "admin123456")
+    headers = get_headers(token)
+
+    # 현재 사용자 정보 조회
+    response = requests.get(f"{BASE_URL}/users/me", headers=headers)
+    print("Current user:", response.json())
+
+    # 키워드 목록 조회
+    response = requests.get(
+        f"{BASE_URL}/keywords/",
+        headers=headers,
+        params={"category": "people", "page_size": 10}
+    )
+    print("Keywords:", response.json())
+
+    # 키워드 생성
+    new_keyword = {
+        "keyword": "테스트 키워드",
+        "category": "topics",
+        "status": "active",
+        "priority": 7
+    }
+    response = requests.post(
+        f"{BASE_URL}/keywords/",
+        headers=headers,
+        json=new_keyword
+    )
+    print("Created keyword:", response.json())
+
+    # 파이프라인 시작
+    pipeline_id = "507f1f77bcf86cd799439015"
+    response = requests.post(
+        f"{BASE_URL}/pipelines/{pipeline_id}/start",
+        headers=headers
+    )
+    print("Pipeline started:", response.json())
+
+if __name__ == "__main__":
+    main()
+```
+
+### JavaScript (Node.js) 예제
+
+```javascript
+const axios = require('axios');
+
+const BASE_URL = 'http://localhost:8101/api/v1';
+
+// 1. 로그인하여 토큰 받기
+async function login(username, password) {
+  const response = await axios.post(`${BASE_URL}/users/login`,
+    new URLSearchParams({ username, password }),
+    { headers: { 'Content-Type': 'application/x-www-form-urlencoded' } }
+  );
+  return response.data.access_token;
+}
+
+// 2. API 클라이언트 생성
+function createClient(token) {
+  return axios.create({
+    baseURL: BASE_URL,
+    headers: {
+      'Authorization': `Bearer ${token}`,
+      'Content-Type': 'application/json'
+    }
+  });
+}
+
+// 3. 사용 예제
+async function main() {
+  try {
+    // 로그인
+    const token = await login('admin', 'admin123456');
+    const client = createClient(token);
+
+    // 현재 사용자 정보 조회
+    const userResponse = await client.get('/users/me');
+    console.log('Current user:', userResponse.data);
+
+    // 키워드 목록 조회
+    const keywordsResponse = await client.get('/keywords/', {
+      params: { category: 'people', page_size: 10 }
+    });
+    console.log('Keywords:', keywordsResponse.data);
+
+    // 키워드 생성
+    const newKeyword = {
+      keyword: '테스트 키워드',
+      category: 'topics',
+      status: 'active',
+      priority: 7
+    };
+    const createResponse = await client.post('/keywords/', newKeyword);
+    console.log('Created keyword:', createResponse.data);
+
+    // 파이프라인 시작
+    const pipelineId = '507f1f77bcf86cd799439015';
+    const startResponse = await client.post(`/pipelines/${pipelineId}/start`);
+    console.log('Pipeline started:', startResponse.data);
+
+  } catch (error) {
+    console.error('Error:', error.response?.data || error.message);
+  }
+}
+
+main();
+```
+
+### JavaScript (Browser/Fetch) 예제
+
+```javascript
+const BASE_URL = 'http://localhost:8101/api/v1';
+
+// 1. 로그인하여 토큰 받기
+async function login(username, password) {
+  const response = await fetch(`${BASE_URL}/users/login`, {
+    method: 'POST',
+    headers: {
+      'Content-Type': 'application/x-www-form-urlencoded',
+    },
+    body: new URLSearchParams({ username, password })
+  });
+
+  if (!response.ok) {
+    throw new Error(`Login failed: ${response.statusText}`);
+  }
+
+  const data = await response.json();
+  return data.access_token;
+}
+
+// 2. 인증된 요청 함수
+async function authenticatedRequest(url, options = {}, token) {
+  const response = await fetch(url, {
+    ...options,
+    headers: {
+      'Authorization': `Bearer ${token}`,
+      'Content-Type': 'application/json',
+      ...options.headers,
+    }
+  });
+
+  if (!response.ok) {
+    const error = await response.json();
+    throw new Error(error.detail || response.statusText);
+  }
+
+  // 204 No Content인 경우 빈 응답
+  if (response.status === 204) {
+    return null;
+  }
+
+  return response.json();
+}
+
+// 3. 사용 예제
+async function main() {
+  try {
+    // 로그인
+    const token = await login('admin', 'admin123456');
+    console.log('Logged in successfully');
+
+    // 현재 사용자 정보 조회
+    const user = await authenticatedRequest(
+      `${BASE_URL}/users/me`,
+      { method: 'GET' },
+      token
+    );
+    console.log('Current user:', user);
+
+    // 키워드 목록 조회
+    const keywords = await authenticatedRequest(
+      `${BASE_URL}/keywords/?category=people&page_size=10`,
+      { method: 'GET' },
+      token
+    );
+    console.log('Keywords:', keywords);
+
+    // 키워드 생성
+    const newKeyword = {
+      keyword: '테스트 키워드',
+      category: 'topics',
+      status: 'active',
+      priority: 7
+    };
+    const created = await authenticatedRequest(
+      `${BASE_URL}/keywords/`,
+      {
+        method: 'POST',
+        body: JSON.stringify(newKeyword)
+      },
+      token
+    );
+    console.log('Created keyword:', created);
+
+  } catch (error) {
+    console.error('Error:', error.message);
+  }
+}
+
+// 브라우저에서 실행
+main();
+```
+
+---
+
+## 부록: 권한 요약표
+
+| 엔드포인트 | 필요 권한 | 비고 |
+|-----------|---------|------|
+| POST /users/login | 공개 | 인증 불필요 |
+| GET /users/me | 인증됨 | 본인 정보만 |
+| GET /users/ | 관리자 | 전체 사용자 목록 |
+| GET /users/stats | 관리자 | 통계 조회 |
+| GET /users/{id} | 관리자 또는 본인 | |
+| POST /users/ | 관리자 | 사용자 생성 |
+| PUT /users/{id} | 관리자 또는 본인 | 본인은 제한적 수정 |
+| DELETE /users/{id} | 관리자 | 본인 삭제 불가 |
+| POST /users/{id}/toggle | 관리자 | 본인 토글 불가 |
+| POST /users/change-password | 인증됨 | 본인만 |
+| GET /keywords/* | 인증됨 | |
+| POST /keywords/ | 인증됨 | |
+| PUT /keywords/{id} | 인증됨 | |
+| DELETE /keywords/{id} | 인증됨 | |
+| GET /pipelines/* | 인증됨 | |
+| POST /pipelines/ | 인증됨 | |
+| PUT /pipelines/{id} | 인증됨 | |
+| DELETE /pipelines/{id} | 인증됨 | |
+| POST /pipelines/{id}/start | 인증됨 | |
+| POST /pipelines/{id}/stop | 인증됨 | |
+| POST /pipelines/{id}/restart | 인증됨 | |
+| GET /applications/ | 인증됨 | 관리자는 모두, 일반은 본인만 |
+| GET /applications/stats | 관리자 | |
+| GET /applications/{id} | 관리자 또는 소유자 | |
+| POST /applications/ | 인증됨 | |
+| PUT /applications/{id} | 관리자 또는 소유자 | |
+| DELETE /applications/{id} | 관리자 또는 소유자 | |
+| POST /applications/{id}/regenerate-secret | 관리자 또는 소유자 | |
+| GET /monitoring/health | 인증됨 | |
+| GET /monitoring/metrics | 인증됨 | |
+| GET /monitoring/logs | 인증됨 | |
+| GET /monitoring/database/stats | 관리자 | |
+| GET /monitoring/database/collections | 관리자 | |
+| GET /monitoring/pipelines/performance | 인증됨 | |
+| GET /monitoring/errors/summary | 인증됨 | |
+
+---
+
+## 변경 이력
+
+| 버전 | 날짜 | 변경 내용 |
+|------|------|---------|
+| 1.0.0 | 2025-01-04 | 초기 버전 (37개 엔드포인트) |
+
+---
+
+**문서 생성일**: 2025-01-04
+**API 버전**: v1
+**테스트 상태**: 100% 완료 (37/37 엔드포인트)
+**서버 포트**: 8101
diff --git a/services/news-engine-console/backend/fix_objectid.py b/services/news-engine-console/backend/fix_objectid.py
new file mode 100644
index 0000000..9a658c7
--- /dev/null
+++ b/services/news-engine-console/backend/fix_objectid.py
@@ -0,0 +1,90 @@
+#!/usr/bin/env python3
+"""Script to add ObjectId conversion before creating model instances"""
+import re
+
+def add_objectid_conversion(file_path, model_name):
+    """Add doc['_id'] = str(doc['_id']) before Model(**doc) calls"""
+
+    with open(file_path, 'r') as f:
+        lines = f.readlines()
+
+    modified_lines = []
+    i = 0
+    changes_made = 0
+
+    while i < len(lines):
+        line = lines[i]
+
+        # Pattern 1: Single line creation like: return Keyword(**doc)
+        if re.search(rf'{model_name}\(\*\*doc\)', line):
+            indent = len(line) - len(line.lstrip())
+            # Check if previous line already has the conversion
+            if i > 0 and 'doc["_id"] = str(doc["_id"])' in lines[i-1]:
+                modified_lines.append(line)
+                i += 1
+                continue
+            # Check if this is inside a loop or conditional that already has conversion
+            if i > 0 and any('doc["_id"] = str(doc["_id"])' in lines[j] for j in range(max(0, i-5), i)):
+                modified_lines.append(line)
+                i += 1
+                continue
+            # Add conversion before this line
+            modified_lines.append(' ' * indent + 'doc["_id"] = str(doc["_id"])  # Convert ObjectId to string\n')
+            modified_lines.append(line)
+            changes_made += 1
+            i += 1
+            continue
+
+        # Pattern 2: In loops like: keywords.append(Keyword(**doc))
+        if re.search(rf'{model_name}\(\*\*doc\)', line) and ('append' in line or 'for' in line):
+            indent = len(line) - len(line.lstrip())
+            # Check if previous line already has the conversion
+            if i > 0 and 'doc["_id"] = str(doc["_id"])' in lines[i-1]:
+                modified_lines.append(line)
+                i += 1
+                continue
+            # Add conversion before this line
+            modified_lines.append(' ' * indent + 'doc["_id"] = str(doc["_id"])  # Convert ObjectId to string\n')
+            modified_lines.append(line)
+            changes_made += 1
+            i += 1
+            continue
+
+        # Pattern 3: Dictionary creation like: return Keyword(**keyword_dict)
+        match = re.search(rf'{model_name}\(\*\*(\w+)\)', line)
+        if match and match.group(1) != 'doc':
+            dict_name = match.group(1)
+            indent = len(line) - len(line.lstrip())
+            # Check if previous line already has the conversion
+            if i > 0 and f'{dict_name}["_id"] = str({dict_name}["_id"])' in lines[i-1]:
+                modified_lines.append(line)
+                i += 1
+                continue
+            # Add conversion before this line
+            modified_lines.append(' ' * indent + f'{dict_name}["_id"] = str({dict_name}["_id"])  # Convert ObjectId to string\n')
+            modified_lines.append(line)
+            changes_made += 1
+            i += 1
+            continue
+
+        # Pattern 4: List comprehension like: [Keyword(**kw) for kw in keywords_dicts]
+        if re.search(rf'\[{model_name}\(\*\*\w+\)', line):
+            # This needs manual fixing as it's a list comprehension
+            print(f"Line {i+1}: List comprehension found, needs manual fixing: {line.strip()}")
+
+        modified_lines.append(line)
+        i += 1
+
+    # Write back
+    with open(file_path, 'w') as f:
+        f.writelines(modified_lines)
+
+    print(f"Modified {file_path}: {changes_made} changes made")
+    return changes_made
+
+if __name__ == "__main__":
+    total = 0
+    total += add_objectid_conversion("app/services/keyword_service.py", "Keyword")
+    total += add_objectid_conversion("app/services/pipeline_service.py", "Pipeline")
+    total += add_objectid_conversion("app/services/application_service.py", "Application")
+    print(f"\nTotal changes: {total}")