Fix page_count migration

src/documents/migrations/1053_document_page_count.py

@@ -1,8 +1,10 @@
-# Generated by Django 4.2.16 on 2024-09-21 15:44
+# Generated by Django 5.1.1 on 2024-09-28 04:42
+
 from pathlib import Path
 
 import pikepdf
 from django.conf import settings
+from django.core.validators import MinValueValidator
 from django.db import migrations
 from django.db import models
 from django.utils.termcolors import colorize as colourise
@@ -50,8 +52,11 @@ class Migration(migrations.Migration):
             name="page_count",
             field=models.PositiveIntegerField(
                 blank=False,
+                help_text="The number of pages of the document.",
                 null=True,
                 unique=False,
+                validators=[MinValueValidator(1)],
+                verbose_name="page count",
                 db_index=False,
             ),
         ),