fix(backend): import session metadata (#12184)

* add storage for historic import metadata for reporting and display purposes

fixes breakage fromhttps://github.com/inventree/InvenTree/pull/12169

* add api bump

* re-enable test

* fix migration

* ensure session is not overwritten

* fix statusrender without custom key

src/backend/InvenTree/InvenTree/api_version.py

@@ -1,11 +1,14 @@
 """InvenTree API version information."""
 
 # InvenTree API version
-INVENTREE_API_VERSION = 508
+INVENTREE_API_VERSION = 509
 """Increment this API version number whenever there is a significant change to the API that any clients need to know about."""
 
 INVENTREE_API_TEXT = """
 
+v509 -> 2026-06-17 : https://github.com/inventree/InvenTree/pull/12184
+    - Adds "completed_row_count_history" and "row_count_history" fields to the DataImportSession model, which store the historic count of completed rows and total rows for a data import session.
+
 v508 -> 2026-06-17 : https://github.com/inventree/InvenTree/pull/11982
    - An order's "status_custom_key" can be updated via PATCH API endpoint
 

src/backend/InvenTree/importer/migrations/0007_dataimportsession_completed_row_count_history_and_more.py

@@ -0,0 +1,23 @@
+# Generated by Django 5.2.15 on 2026-06-17 05:57
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('importer', '0006_dataimportcolumnmap_lookup_field'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='dataimportsession',
+            name='completed_row_count_history',
+            field=models.PositiveIntegerField(blank=True, null=True, verbose_name='Completed Row Count History'),
+        ),
+        migrations.AddField(
+            model_name='dataimportsession',
+            name='row_count_history',
+            field=models.PositiveIntegerField(blank=True, null=True, verbose_name='Row Count History'),
+        ),
+    ]

src/backend/InvenTree/importer/models.py

@@ -385,7 +385,13 @@ class DataImportSession(models.Model):
 
         if self.status != DataImportStatusCode.COMPLETE.value:
             self.status = DataImportStatusCode.COMPLETE.value
+
+            # persist historic count values for reporting purposes
+            self.completed_row_count_history = self.completed_row_count
+            self.row_count_history = self.row_count
+
             self.save()
+
             # Clear staging data now that all rows have been imported
             self.rows.all().delete()
             self.column_mappings.all().delete()
@@ -402,6 +408,14 @@ class DataImportSession(models.Model):
         """Return the number of completed rows for this session."""
         return self.rows.filter(complete=True).count()
 
+    # Historic values for reporting purposes
+    completed_row_count_history = models.PositiveIntegerField(
+        blank=True, null=True, verbose_name=_('Completed Row Count History')
+    )
+    row_count_history = models.PositiveIntegerField(
+        blank=True, null=True, verbose_name=_('Row Count History')
+    )
+
     def available_fields(self):
         """Returns information on the available fields.
 

src/backend/InvenTree/importer/serializers.py

@@ -62,6 +62,8 @@ class DataImportSessionSerializer(InvenTreeModelSerializer):
             'field_filters',
             'row_count',
             'completed_row_count',
+            'completed_row_count_history',
+            'row_count_history',
         ]
         read_only_fields = ['pk', 'user', 'status', 'columns']
 
@@ -220,6 +222,8 @@ class DataImportAcceptRowSerializer(serializers.Serializer):
             row.validate(commit=True, request=request)
 
         if session := self.context.get('session', None):
+            # ensure current state is available
+            session.refresh_from_db()
             session.check_complete()
 
         return rows