feat: added business models, implemented business signup and signin

solution/apps/business/admin.py

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+from django.contrib import admin
+
+from apps.business.models import Business
+
+admin.site.register(Business)

solution/apps/business/apps.py

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+from django.apps import AppConfig
+
+
+class BusinessConfig(AppConfig):
+    name = "apps.business"
+    label = "business"

solution/apps/business/migrations/0001_initial.py

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+# Generated by Django 5.1.5 on 2025-01-20 11:21
+
+import django.core.validators
+import uuid
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    initial = True
+
+    dependencies = [
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='Business',
+            fields=[
+                ('id', models.UUIDField(default=uuid.uuid4, editable=False, primary_key=True, serialize=False)),
+                ('name', models.CharField(max_length=50, validators=[django.core.validators.MinLengthValidator(5)])),
+                ('email', models.EmailField(max_length=120, unique=True, validators=[django.core.validators.MinLengthValidator(8)])),
+                ('password', models.CharField(max_length=60, validators=[django.core.validators.RegexValidator('^(?=.*[a-z])(?=.*[A-Z])(?=.*\\d)(?=.*[@$!%*?&])[A-Za-z\\d@$!%*?&]{8,}$')])),
+                ('token_version', models.BigIntegerField(default=0)),
+            ],
+            options={
+                'abstract': False,
+            },
+        ),
+    ]

solution/apps/business/models.py

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+import jwt
+from django.conf import settings
+from django.core.validators import MinLengthValidator, RegexValidator
+from django.db import models
+
+from apps.core.models import BaseModel
+
+
+class Business(BaseModel):
+    name = models.CharField(max_length=50, validators=[MinLengthValidator(5)])
+    email = models.EmailField(
+        unique=True,
+        max_length=120,
+        validators=[MinLengthValidator(8)],
+    )
+    password = models.CharField(
+        max_length=60,
+        validators=[
+            RegexValidator(
+                r"^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*[@$!%*?&])[A-Za-z\d@$!%*?&]{8,}$"
+            ),
+        ],
+    )
+    token_version = models.BigIntegerField(default=0)
+
+    def __str__(self) -> str:
+        return self.name
+
+    def generate_token(self) -> str:
+        return jwt.encode(
+            {
+                "business_id": str(self.id),
+                "token_version": self.token_version,
+            },
+            settings.SECRET_KEY,
+            algorithm="HS256",
+        )

solution/apps/core/apps.py

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+from django.apps import AppConfig
+
+
+class CoreConfig(AppConfig):
+    name = "apps.core"
+    label = "core"

solution/apps/core/models.py

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+import uuid
+
+from django.core.exceptions import ValidationError
+from django.db import models
+
+from config.errors import UniqueConstraintError
+
+
+class BaseModel(models.Model):
+    id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
+
+    class Meta:
+        abstract = True
+
+    def save(self, *args, **kwargs) -> None:  # noqa: ANN002, ANN003
+        self.full_clean(validate_unique=False)
+
+        try:
+            self.validate_unique()
+        except ValidationError as e:
+            raise UniqueConstraintError(e) from None
+
+        super().save(*args, **kwargs)