Add new fields to Part model

- bom_checksum (stores checksum calculated when the BOM was checked)
- bom_checked_by (User who checked the BOM)
- bom_checked_date (When the BOM was last checked)

InvenTree/part/migrations/0022_auto_20190512_1246.py

@@ -0,0 +1,31 @@
+# Generated by Django 2.2 on 2019-05-12 02:46
+
+from django.conf import settings
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
+        ('part', '0021_auto_20190510_2220'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='part',
+            name='bom_checked_by',
+            field=models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.SET_NULL, related_name='boms_checked', to=settings.AUTH_USER_MODEL),
+        ),
+        migrations.AddField(
+            model_name='part',
+            name='bom_checked_date',
+            field=models.DateField(blank=True, null=True),
+        ),
+        migrations.AddField(
+            model_name='part',
+            name='bom_checksum',
+            field=models.CharField(blank=True, help_text='Stored BOM checksum', max_length=128),
+        ),
+    ]