apps/core/apps.py

import os
import sys

from django.apps import AppConfig


class CoreConfig(AppConfig):
    default_auto_field = "django.db.models.BigAutoField"
    name = "apps.core"

    def ready(self):
        is_runserver = len(sys.argv) > 1 and sys.argv[1] == "runserver"
        if not is_runserver:
            return

        # With autoreload (default), only start in the child process.
        # With --noreload, RUN_MAIN is never set so start directly.
        uses_autoreload = "--noreload" not in sys.argv
        if uses_autoreload and os.environ.get("RUN_MAIN") != "true":
            return

        from .tasks import start_stock_fetcher

        start_stock_fetcher()