fix: allow blank on descriprion book and add uuid field on librarian and member master

books/models.py

+from datetime import datetime
 from django.db import models
 from categories.models import Category
+from django.core.validators import MinValueValidator, MaxValueValidator
 
 
 class Book(models.Model):
     title = models.CharField(max_length=100)
-    description = models.CharField(max_length=255)
+    description = models.CharField(max_length=255, blank=True, null=True)
     stock = models.BigIntegerField(blank=True, null=True)
     category = models.ForeignKey(
         to=Category, on_delete=models.CASCADE, blank=True, null=True
@@ -12,6 +14,12 @@ class Book(models.Model):
     cover_image = models.ImageField(upload_to="uploads", blank=True, null=True)
     created_at = models.DateTimeField(auto_now_add=True)
     updated_at = models.DateTimeField(auto_now=True)
+    published_year = models.PositiveIntegerField(
+        validators=[MinValueValidator(1900), MaxValueValidator(datetime.now().year)],
+        help_text="E.g: 2024",
+        blank=True,
+        null=True,
+    )
 
     def __str__(self):
         return self.title

librarians/models.py

+import uuid
 from django.db import models
-from django.contrib.auth.models import User
 
 
 class Librarians(models.Model):
+    uuid = models.UUIDField(default=uuid.uuid4())
     name = models.CharField(max_length=50)
     email = models.EmailField()
     password = models.CharField(max_length=255)

members/models.py

+import uuid
 from django.db import models
 from members.utils import generate_unique_number
 
@@ -5,6 +6,7 @@ random_number = generate_unique_number(15)
 
 
 class Members(models.Model):
+    uuid = models.UUIDField(default=uuid.uuid4())
     account_number = models.CharField(
         default=random_number, editable=False, max_length=15
     )