[4.2.x] Fixed #34590 -- Reverted "Refs #33308 -- Improved adapting DecimalField values to decimal."

This reverts 7990d254b0af158baf827fafbd90fe8e890f23bd.

Thanks Marc Odermatt for the report.
Backport of 0c1518ee429b01c145cf5b34eab01b0b92f8c246 from main

django/db/models/fields/__init__.py

@@ -1753,13 +1753,11 @@ class DecimalField(Field):
             )
         return decimal_value
 
-    def get_db_prep_value(self, value, connection, prepared=False):
-        if not prepared:
-            value = self.get_prep_value(value)
+    def get_db_prep_save(self, value, connection):
         if hasattr(value, "as_sql"):
             return value
         return connection.ops.adapt_decimalfield_value(
-            value, self.max_digits, self.decimal_places
+            self.to_python(value), self.max_digits, self.decimal_places
         )
 
     def get_prep_value(self, value):

docs/releases/4.2.2.txt

@@ -36,3 +36,7 @@ Bugfixes
 * Fixed a regression in Django 4.2 that caused a crash of
   ``QuerySet.aggregate()`` with aggregates referencing subqueries
   (:ticket:`34551`).
+
+* Fixed a regression in Django 4.2 that caused a crash of querysets on SQLite
+  when filtering on ``DecimalField`` against values outside of the defined
+  range (:ticket:`34590`).

tests/model_fields/test_decimalfield.py

@@ -91,7 +91,10 @@ class DecimalFieldTests(TestCase):
         Really big values can be used in a filter statement.
         """
         # This should not crash.
-        Foo.objects.filter(d__gte=100000000000)
+        self.assertSequenceEqual(Foo.objects.filter(d__gte=100000000000), [])
+
+    def test_lookup_decimal_larger_than_max_digits(self):
+        self.assertSequenceEqual(Foo.objects.filter(d__lte=Decimal("123456")), [])
 
     def test_max_digits_validation(self):
         field = models.DecimalField(max_digits=2)