WARNINGS: ?: (staticfiles.W004) The directory 'static' in the STATICFILES_DIRS setting does not exist. buy.Cart: (models.W042) Auto-created primary key used when not defining a primary key type, by default 'django.db.models.AutoField'. HINT: Configure the DEFAULT_AUTO_FIELD setting or the BuyConfig.default_auto_field attribute to point to a subclass of AutoField, e.g. 'django.d b.models.BigAutoField'. buy.Orders: (models.W042) Auto-created primary key used when not defining a primary key type, by default 'django.db.models.AutoField'. HINT: Configure the DEFAULT_AUTO_FIELD setting or the BuyConfig.default_auto_field attribute to point to a subclass of AutoField, e.g. 'django.d b.models.BigAutoField'. sale.Brand: (models.W042) Auto-created primary key used when not defining a primary key type, by default 'django.db.models.AutoField'. HINT: Configure the DEFAULT_AUTO_FIELD setting or the SaleConfig.default_auto_field attribute to point to a subclass of AutoField, e.g. 'django. db.models.BigAutoField'. sale.Carinfo: (models.W042) Auto-created primary key used when not defining a primary key type, by default 'django.db.models.AutoField'. HINT: Configure the DEFAULT_AUTO_FIELD setting or the SaleConfig.default_auto_field attribute to point to a subclass of AutoField, e.g. 'django. db.models.BigAutoField'. userinfo.UserInfo: (models.W042) Auto-created primary key used when not defining a primary key type, by default 'django.db.models.AutoField'. HINT: Configure the DEFAULT_AUTO_FIELD setting or the UserinfoConfig.default_auto_field attribute to point to a subclass of AutoField, e.g. 'dja ngo.db.models.BigAutoField'. No changes detected

The warnings indicate the following issues:

- `staticfiles.W004`: The `STATICFILES_DIRS` setting is configured to use a directory named `static`, but it does not exist in your project. You should either create the directory or modify the setting to use an existing directory.

- `models.W042`: Auto-created primary keys are being used for several of your models (`buy.Cart`, `buy.Orders`, `sale.Brand`, `sale.Carinfo`, `userinfo.UserInfo`). You should explicitly define a primary key field for each model instead of relying on the default auto-generated primary key. To do this, add a `primary_key=True` argument to a field in the model definition, or specify a custom primary key field using the `primary_key` attribute.

- `No changes detected`: This is not a warning, but rather an informational message indicating that no changes were detected in your models that require migration.

To address the `models.W042` warnings, you can either add a `primary_key=True` argument to an existing field or create a new field with the `primary_key=True` argument. For example:

class Cart(models.Model):
    cart_id = models.AutoField(primary_key=True)
    # ...

Alternatively, you can configure the `DEFAULT_AUTO_FIELD` setting in your project settings to specify a custom primary key field for all models in your project. For example:

# settings.py
from django.conf import settings

class BuyConfig(AppConfig):
    default_auto_field = 'django.db.models.BigAutoField'

settings.configure(BUY_CONFIG=BuyConfig)

This will set the default auto-generated primary key field for all models in the `buy` app to `BigAutoField`. You can repeat this pattern for other apps in your project as well.