PRWLR-3997: fix(Models): create BaseModel & TenantModel (#13)

* fix(Models): create BaseModel & TenantModel

* update description to match class

Co-authored-by: Víctor Fernández Poyatos <victor@prowler.com>

* fix(Tenants): rename TenantModel to Tenant

---------

Co-authored-by: Víctor Fernández Poyatos <victor@prowler.com>

src/backend/api/models.py

@@ -1,4 +1,27 @@
 from django.db import models
+import uuid
+
+
+class Base(models.Model):
+    """
+    Abstract base model class that provides common fields for all models.
+    """
+
+    id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
+
+    inserted_at = models.DateTimeField(auto_now_add=True, editable=False)
+    updated_at = models.DateTimeField(auto_now=True, editable=False)
+
+    class Meta:
+        abstract = True
+
+
+class Tenant(Base):
+    """
+    The Tenant is the basic grouping in the system. It is used to separate data between customers.
+    """
+
+    name = models.CharField(max_length=100)
 
 
 class TestModel(models.Model):