Detect and reset invalid ASNs to 0 during indexing with a loud error to the user

src/documents/models.py

@@ -3,6 +3,7 @@ import logging
 import os
 import re
 from collections import OrderedDict
+from typing import Final
 from typing import Optional
 
 import dateutil.parser
@@ -229,6 +230,9 @@ class Document(models.Model):
         help_text=_("The original name of the file when it was uploaded"),
     )
 
+    ARCHIVE_SERIAL_NUMBER_MIN: Final[int] = 0
+    ARCHIVE_SERIAL_NUMBER_MAX: Final[int] = 0xFF_FF_FF_FF
+
     archive_serial_number = models.PositiveIntegerField(
         _("archive serial number"),
         blank=True,
@@ -236,8 +240,8 @@ class Document(models.Model):
         unique=True,
         db_index=True,
         validators=[
-            MaxValueValidator(0xFF_FF_FF_FF),
-            MinValueValidator(0),
+            MaxValueValidator(ARCHIVE_SERIAL_NUMBER_MAX),
+            MinValueValidator(ARCHIVE_SERIAL_NUMBER_MIN),
         ],
         help_text=_(
             "The position of this document in your physical document " "archive.",