Specific DecimalField with max_digits > 15 can be stored but not retrieved on SQLite

[Orazio]

Similar to https://code.djangoproject.com/ticket/33954 but different exception:

Given this model

class Apple(models.Model):
	weight = models.DecimalField(max_digits=16, decimal_places=0)

Trying to store 9999999999999999 (16 digits)

$ python manage.py shell
7 objects imported automatically (use -v 2 for details).

Python 3.12.3 (main, Feb  4 2025, 14:48:35) [GCC 13.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
(InteractiveConsole)
>>> test = Apple(weight="9999999999999999")
>>> test.full_clean()
>>> test.save()
>>> Apple.objects.last()
Traceback (most recent call last):
  File "<console>", line 1, in <module>
  File "/home/user/test_project/django/django/db/models/manager.py", line 87, in manager_method
    return getattr(self.get_queryset(), name)(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/user/test_project/django/django/db/models/query.py", line 1105, in last
    for obj in queryset[:1]:
  File "/home/user/test_project/django/django/db/models/query.py", line 383, in __iter__
    self._fetch_all()
  File "/home/user/test_project/django/django/db/models/query.py", line 1923, in _fetch_all
    self._result_cache = list(self._iterable_class(self))
                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/user/test_project/django/django/db/models/query.py", line 122, in __iter__
    for row in compiler.results_iter(results):
  File "/home/user/test_project/django/django/db/models/sql/compiler.py", line 1540, in apply_converters
    value = converter(value, expression, connection)
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/user/test_project/django/django/db/backends/sqlite3/operations.py", line 346, in converter
    return create_decimal(value).quantize(
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
decimal.InvalidOperation: [<class 'decimal.InvalidOperation'>]
>>>

I made sure to test with the latest commit

$ pip list
Package  Version               Editable project location
-------- --------------------- -------------------------
asgiref  3.8.1
Django   6.0.dev20250306010223 /home/user/test_project/django
pip      24.0
sqlparse 0.5.3

Exception is raised here: ​https://github.com/django/django/blob/bad1a18ff28a671f2fdfd447bdf8f43602f882c2/django/db/backends/sqlite3/operations.py#L346

As you might imagine this also fails when say max_digits is 20 and storing 20 nines, and so on. Shouldn't this raise an error when running full_clean() on the object before storing?

[Hridesh MG]

Was able to reproduce this issue, also noticed that it triggers on a specific number - i.e. test = Apple(weight=9999999999999994) seems to work fine but the moment weight becomes 9999999999999995 it starts to throw the error