Fixed imports

app.py

 from flask import Flask, render_template
 import RPi.GPIO as GPIO
 from flask_sqlalchemy import SQLAlchemy
-from daily_usage import DailyUsage
+import daily_usage
 
 app = Flask(__name__)
 app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///energyUsage'
@@ -11,7 +11,7 @@ db.create_all()
 GPIO.setmode(GPIO.BCM)
 GPIO.setwarnings(False)
 
-test = DailyUsage("12/11/2019", 5)
+test = daily_usage.DailyUsage("12/11/2019", 5)
 db.session.add(test)
 db.session.commit()
 

daily_usage.py

 from app import db
 
+
 class DailyUsage(db.Model):
     id = db.Column(db.Integer, primary_key=True, autoincrement=True)
     date = db.Column(db.String(80), unique=True, nullable=False)