diff --git a/backend/db/crud.py b/backend/db/crud.py
index b90c047440b3ceabd6dbbaacfe6a1cb4ec24ad56..45f099a6f81d551df76bbc4645d2c189f422467e 100644
--- a/backend/db/crud.py
+++ b/backend/db/crud.py
@@ -7,7 +7,8 @@ from db import models, schemas
 
 def get_records(place: str, db: Session):
     """ Get all the records for the given place """
-    records = db.query(models.Records).filter(models.Records.place == place).order_by(models.Records.date.desc()).all()
+    records = db.query(models.Records).filter(
+        models.Records.place == place).order_by(models.Records.date.desc()).all()
     return records
 
 
@@ -17,4 +18,4 @@ def create_record(new_record: schemas.RecordBase, db: Session):
     db.add(db_record)
     db.commit()
     db.refresh(db_record)
-    return db_record
\ No newline at end of file
+    return db_record
diff --git a/backend/db/database.py b/backend/db/database.py
index 6f995021c61b44f28e3d48520cfa0a1a4e0ca536..24d0618c30abfffc5d88776c5eec1507c84bc7ca 100644
--- a/backend/db/database.py
+++ b/backend/db/database.py
@@ -15,4 +15,3 @@ engine = create_engine(SQLALCHEMY_DATABASE_URL)
 SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
 
 Base = declarative_base()
-
diff --git a/backend/db/models.py b/backend/db/models.py
index 55820de9e561fe85ec3abfa712e33464612e82f8..4971ef343a8108bf26621ace75607ffe0e0afb9b 100644
--- a/backend/db/models.py
+++ b/backend/db/models.py
@@ -14,4 +14,4 @@ class Records(Base):
     place = Column(String(10))
     date = Column(DateTime)
     density = Column(Float)
-    waiting_time = Column(Interval)
\ No newline at end of file
+    waiting_time = Column(Interval)
diff --git a/backend/db/schemas.py b/backend/db/schemas.py
index 600efc71449952c86b53af757d92db826c9642f4..5f10ba98ce31f03dee794dee223821eee2754bef 100644
--- a/backend/db/schemas.py
+++ b/backend/db/schemas.py
@@ -8,14 +8,17 @@ from pydantic import BaseModel, Field
 
 class RecordBase(BaseModel):
     """Records base schema"""
-    place: str = Field(..., title="Name of the RU corresponding the given record")
+    place: str = Field(...,
+                       title="Name of the RU corresponding the given record")
     date: datetime = Field(..., title="Date of the record")
     density: float = Field(..., title="Estimated density of people")
-    waiting_time: Optional[timedelta] = Field(title="Estimated waiting time for people coming at this date")
-    
+    waiting_time: Optional[timedelta] = Field(
+        title="Estimated waiting time for people coming at this date")
+
+
 class Record(RecordBase):
     """Database records schema"""
     id: int
 
     class Config:
-        orm_mode = True
\ No newline at end of file
+        orm_mode = True
diff --git a/backend/main.py b/backend/main.py
index 3d1329d138ee8e3142058bcde1a28087a3a3ea39..ac7fe9c002f68605e18a98f8c676d20fc788bbcf 100644
--- a/backend/main.py
+++ b/backend/main.py
@@ -25,6 +25,7 @@ app.add_middleware(
     allow_headers=["*"]
 )
 
+
 def get_db():
     """Create a database session."""
     db = database.SessionLocal()
@@ -83,4 +84,4 @@ async def estimate_(id: str) -> float:
     pred_map = np.squeeze(model.predict(input_image))
     count_prediction = np.sum(pred_map)
     return count_prediction
-"""
\ No newline at end of file
+"""