diff --git a/examples/industrial-ai-apiserver/.gitignore b/examples/industrial-ai-apiserver/.gitignore
index a101926a6b19def0f29644b2a2ef79a2d397af04..40499486fbd878035397556e9aa3ae25cc1eff03 100644
--- a/examples/industrial-ai-apiserver/.gitignore
+++ b/examples/industrial-ai-apiserver/.gitignore
@@ -2,6 +2,9 @@
 __pycache__/
 *.py[cod]
 
+# Build
+E:\\dhuProject\\pecan-swagger\\examples\\industrial-ai-apiserver\\industrialai.db
+
 # C extensions
 *.so
 
diff --git a/examples/industrial-ai-apiserver/industrialai/db/api.py b/examples/industrial-ai-apiserver/industrialai/db/api.py
index 2d5825ddacc18587a2e3653730250c25d20b9457..3e45075fbf5b96ab1c8603720325a5caa03907d0 100644
--- a/examples/industrial-ai-apiserver/industrialai/db/api.py
+++ b/examples/industrial-ai-apiserver/industrialai/db/api.py
@@ -5,7 +5,6 @@ import os
 from pecan import abort
 from sqlalchemy import create_engine, func
 from sqlalchemy.orm import exc
-from sqlalchemy.orm import joinedload
 from sqlalchemy.orm import sessionmaker
 
 logger = logging.getLogger(__name__)
@@ -22,7 +21,8 @@ def get_engine():
         return _ENGINE
     DB_URL = (
         os.getenv("db_url") or
-        "sqlite:///E:\\dhuProject\\pecan-swagger\\examples\\industrial-ai-apiserver\\industrialai.db?check_same_thread=False"
+        "sqlite:///E:\\dhuProject\\pecan-swagger\\examples\\\
+            industrial-ai-apiserver\\industrialai.db?check_same_thread=False"
     )
     _ENGINE = create_engine(DB_URL, echo=True)
     return _ENGINE
diff --git a/examples/industrial-ai-apiserver/industrialai/db/model.py b/examples/industrial-ai-apiserver/industrialai/db/model.py
index 6c5c9811e5b1ac4740f628da5251515df7dfd955..3c7492cbc76778259de808a7fc694bb9d20e24a4 100644
--- a/examples/industrial-ai-apiserver/industrialai/db/model.py
+++ b/examples/industrial-ai-apiserver/industrialai/db/model.py
@@ -4,9 +4,7 @@ from sqlalchemy import DateTime
 from sqlalchemy.ext.declarative import declarative_base
 from sqlalchemy import ForeignKey
 from sqlalchemy import Integer
-from sqlalchemy.orm import relationship
 from sqlalchemy import String
-from sqlalchemy import Table
 
 Base = declarative_base()
 
@@ -14,6 +12,7 @@ Base = declarative_base()
 def init_db(_ENGINE):
     Base.metadata.create_all(_ENGINE)
 
+
 class User(Base):
     __tablename__ = 'user'
     id = Column(Integer, primary_key=True)
@@ -32,4 +31,3 @@ class Role(Base):
     __tablename__ = 'role'
     id = Column(Integer, primary_key=True)
     title = Column(String(32))
-