diff --git a/.gitignore b/.gitignore
index 2eea525..6d78c3e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,2 @@
-.env
\ No newline at end of file
+.env
+summerizer.py
\ No newline at end of file
diff --git a/api/__init__.py b/api/__init__.py
new file mode 100644
index 0000000..ddceb2f
--- /dev/null
+++ b/api/__init__.py
@@ -0,0 +1 @@
+#api/__init__.py
\ No newline at end of file
diff --git a/api/auth.py b/api/auth.py
new file mode 100644
index 0000000..bb97713
--- /dev/null
+++ b/api/auth.py
@@ -0,0 +1,42 @@
+#api/auth.py
+from flask import Blueprint, session, redirect, url_for, jsonify
+from authlib.integrations.flask_client import OAuth
+import env_provider
+auth_bp = Blueprint('auth', __name__, url_prefix='/api')
+
+oauth = OAuth()
+keycloak = oauth.register(
+    'keycloak',
+    client_id=env_provider.CLIENT_ID,
+    client_secret=env_provider.CLIENT_SECRET,
+    server_metadata_url="https://login.hangman-lab.top/auth/realms/Hangman-Lab/.well-known/openid-configuration",
+    client_kwargs={"scope": "openid email profile"},
+)
+
+@auth_bp.route('/login', methods=['GET'])
+def login():
+    redirect_uri = url_for("auth.authorize", _external=True)
+    return keycloak.authorize_redirect(redirect_uri)
+
+@auth_bp.route('/authorize', methods=['GET'])
+def authorize():
+    try:
+        token = keycloak.authorize_access_token()
+        user_info = keycloak.parse_id_token(token)
+        session['user'] = user_info
+        return jsonify({"message": "login successful", "user": user_info})
+    except Exception as e:
+        return jsonify({"error": "Authorization failed"}), 401
+@auth_bp.route('/logout', methods=['GET'])
+def logout():
+    session.pop('user', None)
+    logout_url = "https://login.hangman-lab.top/auth/realms/Hangman-Lab/protocol/openid-connect/logout"
+    return redirect(logout_url)
+
+@auth_bp.route("/user", methods=["GET"])
+def user():
+    u = session.get('user')
+    if not u:
+        return jsonify({"username": "guest", "role": "guest"})
+    return jsonify(u)
+
diff --git a/api/markdown.py b/api/markdown.py
new file mode 100644
index 0000000..27f412e
--- /dev/null
+++ b/api/markdown.py
@@ -0,0 +1,51 @@
+#api/markdown.py
+from flask import Blueprint, request, jsonify
+from db import get_db
+from db.models.Markdown import Markdown
+
+markdown_bp = Blueprint('markdown', __name__, url_prefix='/api/markdown')
+
+@markdown_bp.route('/<int:markdown_id>', methods=['GET'])
+def get_markdown(markdown_id):
+    with get_db() as db:
+        markdown = db.query(Markdown).get(markdown_id)
+        if markdown is None:
+            return jsonify({"error": "file not found"}), 404
+        return jsonify(markdown.to_dict())
+
+@markdown_bp.route('/', methods=['POST'])
+def create_markdown():
+    data = request.json
+    title = data.get('title')
+    content = data.get('content')
+    path = data.get('path')
+    if not title or not content:
+        return jsonify({"error": "missing required fields"}), 400
+    new_markdown = Markdown(title=title, content=content, path=path)
+    with get_db() as db:
+        db.add(new_markdown)
+        db.commit()
+    return jsonify(new_markdown.to_dict()), 201
+
+@markdown_bp.route('/<int:markdown_id>', methods=['PUT'])
+def update_markdown(markdown_id):
+    with get_db() as db:
+        markdown = db.query(Markdown).get(markdown_id)
+        if markdown is None:
+            return jsonify({"error": "file not found"}), 404
+        data = request.json
+        markdown.title = data.get('title')
+        markdown.content = data.get('content')
+        markdown.path = data.get('path')
+        db.commit()
+        return jsonify(markdown.to_dict()), 200
+
+@markdown_bp.route('/<int:markdown_id>', methods=['DELETE'])
+def delete_markdown(markdown_id):
+    with get_db() as db:
+        markdown = db.query(Markdown).get(markdown_id)
+        if markdown is None:
+            return jsonify({"error": "file not found"}), 404
+        db.delete(markdown)
+        db.commit()
+        return jsonify({"message": "deleted"}), 200
\ No newline at end of file
diff --git a/app.py b/app.py
index f407c0e..0140ac9 100644
--- a/app.py
+++ b/app.py
@@ -1,51 +1,30 @@
-from authlib.integrations import flask_client
-from flask import Flask, jsonify, request, url_for, redirect, session
+# app.py
+from urllib.parse import urlparse
+
+from flask import Flask
 from flask_cors import  CORS
-from authlib.integrations.flask_client import OAuth
-import os
+import env_provider
+import db
+from api.auth import auth_bp
+from api.markdown import markdown_bp
 
+
+def is_allowed_origin(origin):
+    parsed_origin = urlparse(origin)
+    if parsed_origin.hostname in ['localhost', '127.0.0.1']:
+        return True
+    allowed_origins = [
+        "https://login.hangman-lab.top",
+        "https://git.hangman-lab.top",
+    ]
+    return origin in allowed_origins
+
+db.create_all()
 app = Flask(__name__)
-CORS(app)
-oauth = OAuth(app)
-
-keycloak = oauth.register(
-    'keycloak',
-    client_id="main",
-    client_secret="<KEY>",
-    server_metadata_url="https://login.hangman-lab.top/auth/realms/Hangman-Lab/.well-known/openid-configuration",
-    client_kwargs={"scope": "openid email profile"},
-)
-
-
-@app.route('/api/login')
-def login():
-    redirect_uri = url_for("authorize", _external=True)
-    return keycloak.authorize_redirect(redirect_uri)
-
-@app.route('/api/authorize')
-def authorize():
-    token = keycloak.authorize_access_token()
-    user_info = keycloak.parse_id_token(token)
-    session['user'] = user_info
-
-@app.route('/api/logout')
-def logout():
-    session.pop('user', None)
-    logout_url = "https://login.hangman-lab.top/auth/realms/Hangman-Lab/protocol/openid-connect/logout"
-    return redirect(logout_url)
-
-@app.route("/api/user")
-def user():
-    u = session.get('user')
-    if not u:
-        return jsonify({"username": "guest", "role": "guest"})
-    return jsonify(user)
-
-@app.route('/api/get_note_list', methods=['GET'])
-def get_note_list():
-    raise NotImplementedError
-
-@app.route('/api/get_note', methods=['GET'])
-def get_note(idx):
-    raise NotImplementedError
+app.secret_key = env_provider.SESSION_SECRET_KEY
+CORS(app, resources={r"/api/*": {"origins": is_allowed_origin}})
 
+app.register_blueprint(markdown_bp)
+app.register_blueprint(auth_bp)
+if __name__ == '__main__':
+    app.run(host='0.0.0.0', port=5000)
diff --git a/db/__init__.py b/db/__init__.py
new file mode 100644
index 0000000..902c784
--- /dev/null
+++ b/db/__init__.py
@@ -0,0 +1,23 @@
+#db/__init__.py
+from contextlib import contextmanager
+from models import Base
+
+
+from sqlalchemy.orm import sessionmaker
+from sqlalchemy import create_engine
+import env_provider
+
+engine = create_engine(env_provider.DB_CONNECT_STRING)
+SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
+@contextmanager
+def get_db():
+    db = SessionLocal()
+    try:
+        yield db
+    finally:
+        db.close()
+
+
+def create_all():
+    with engine.begin() as conn:
+        Base.metadata.create_all(bind=conn)
\ No newline at end of file
diff --git a/db/models/BackendLog.py b/db/models/BackendLog.py
new file mode 100644
index 0000000..8fcb2ce
--- /dev/null
+++ b/db/models/BackendLog.py
@@ -0,0 +1,21 @@
+#db/models/BackendLog.py
+from sqlalchemy import Column, Integer, String, DateTime, Text
+from db.models import Base
+import datetime
+
+
+class BackendLog(Base):
+    __tablename__ = 'backend_log'
+    id = Column(Integer, primary_key=True, autoincrement=True)
+    level = Column(String(50), nullable=False)
+    message = Column(Text, nullable=False)
+    timestamp = Column(DateTime, nullable=False)
+    extra = Column(Text, nullable=True)
+    def to_dict(self):
+        return {
+            "id": self.id,
+            "level": self.level,
+            "message": self.message,
+            "timestamp": self.timestamp,
+            "extra": self.extra,
+        }
diff --git a/db/models/Markdown.py b/db/models/Markdown.py
new file mode 100644
index 0000000..002a8d3
--- /dev/null
+++ b/db/models/Markdown.py
@@ -0,0 +1,21 @@
+#db/models/Markdown.py
+from sqlalchemy import Column, Text, Integer, String, DateTime
+from db.models import Base
+import datetime
+
+class Markdown(Base):
+    __tablename__ = 'markdown'
+    id = Column(Integer, primary_key=True)
+    title = Column(String(255), nullable=False)
+    content = Column(Text, nullable=False)
+    created_at = Column(DateTime, default=datetime.datetime.utcnow)
+    path = Column(String(255), nullable=False)
+
+    def to_dict(self):
+        return {
+            'id': self.id,
+            'title': self.title,
+            'content': self.content,
+            'created_at': self.created_at,
+            'path': self.path,
+        }
diff --git a/db/models/__init__.py b/db/models/__init__.py
new file mode 100644
index 0000000..5bf6f52
--- /dev/null
+++ b/db/models/__init__.py
@@ -0,0 +1,10 @@
+#db/models/__init__.py
+
+import pkgutil
+import importlib
+from sqlalchemy.ext.declarative import declarative_base
+Base = declarative_base()
+package_name = "db.models"
+for _, module_name, _ in pkgutil.iter_modules(__path__):
+    importlib.import_module(f"{package_name}.{module_name}")
+
diff --git a/db/utils.py b/db/utils.py
new file mode 100644
index 0000000..9328fb7
--- /dev/null
+++ b/db/utils.py
@@ -0,0 +1,9 @@
+#db/utils.py
+from db import get_db
+from db.models.BackendLog import BackendLog
+
+def insert_backend_log(level, message, extra=None):
+    log_entry = BackendLog(level=level, message=message, extra=extra)
+    with get_db() as db:
+        db.add(log_entry)
+        db.commit()
\ No newline at end of file
diff --git a/env_provider.py b/env_provider.py
new file mode 100644
index 0000000..1487a64
--- /dev/null
+++ b/env_provider.py
@@ -0,0 +1,10 @@
+#env_provider.py
+import os
+from dotenv import load_dotenv
+
+load_dotenv()
+
+CLIENT_ID = os.getenv("CLIENT_ID")
+CLIENT_SECRET = os.getenv("CLIENT_SECRET")
+DB_CONNECT_STRING = os.getenv("DB_CONNECT_STRING")
+SESSION_SECRET_KEY = os.getenv("SESSION_SECRET_KEY")
\ No newline at end of file
diff --git a/logging_handlers/DatabaseLogHandler.py b/logging_handlers/DatabaseLogHandler.py
new file mode 100644
index 0000000..88e55bf
--- /dev/null
+++ b/logging_handlers/DatabaseLogHandler.py
@@ -0,0 +1,19 @@
+#logging_handlers/DatabaseLogHandler.py
+
+import logging
+import traceback
+from db import get_db
+from db.models.BackendLog import BackendLog
+class DatabaseLogHandler(logging.Handler):
+    def emit(self, record):
+        message = self.format(record)
+        level = record.levelname
+        extra = getattr(record, 'extra', None)
+
+        log_entry = BackendLog(message=message, level=level, extra=extra)
+        try:
+            with get_db() as db:
+                db.add(log_entry)
+                db.commit()
+        except Exception:
+            print(f"Failed to log to database: {traceback.format_exc()}")
\ No newline at end of file
diff --git a/logging_handlers/__init__.py b/logging_handlers/__init__.py
new file mode 100644
index 0000000..6305613
--- /dev/null
+++ b/logging_handlers/__init__.py
@@ -0,0 +1 @@
+#logging_handlers/__init__.py
\ No newline at end of file
diff --git a/requirements.txt b/requirements.txt
new file mode 100644
index 0000000..e69de29