from django.utils.deprecation import MiddlewareMixin
from peewee import *

database = SqliteDatabase('my_app.db')

class DatabaseConnectMiddleware(MiddlewareMixin):
    def process_request(self, request):
        database.connect()

    def process_response(self, request, response):
        if not database.is_closed():
            database.close()
        return response

# settings.py

MIDDLEWARE = [
    'chart.mymiddlewares.DatabaseConnectMiddleware'
]