Replace "addTrasactionNote" function with "add_tracking_entry"

- Does not add translated strings to the database

InvenTree/stock/migrations/0060_auto_20210511_1713.py

@@ -0,0 +1,28 @@
+# Generated by Django 3.2 on 2021-05-11 07:13
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('stock', '0059_auto_20210404_2016'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='stockitemtracking',
+            name='deltas',
+            field=models.JSONField(blank=True, null=True),
+        ),
+        migrations.AddField(
+            model_name='stockitemtracking',
+            name='tracking_type',
+            field=models.IntegerField(default=0),
+        ),
+        migrations.AlterField(
+            model_name='stockitemtracking',
+            name='title',
+            field=models.CharField(blank=True, help_text='Tracking entry title', max_length=250, verbose_name='Title'),
+        ),
+    ]

InvenTree/stock/migrations/0061_auto_20210511_0911.py

@@ -0,0 +1,59 @@
+# Generated by Django 3.2 on 2021-05-10 23:11
+
+from django.db import migrations
+
+
+def update_history(apps, schema_editor):
+    """
+    Update each existing StockItemTracking object,
+    convert the recorded "quantity" to a delta
+    """
+
+    StockItem = apps.get_model('stock', 'stockitem')
+    StockItemTracking = apps.get_model('stock', 'stockitemtracking')
+
+    update_count = 0
+
+    for item in StockItem.objects.all():
+
+        history = StockItemTracking.objects.filter(item=item).order_by('date')
+
+        if history.count() == 0:
+            continue
+
+        quantity = history[0].quantity
+
+        for entry in history:
+            
+            q = entry.quantity
+
+            if not q == quantity:
+
+                entry.deltas = {
+                    'quantity': float(q),
+                }
+
+                entry.save()
+
+                update_count += 1
+
+                quantity = q
+
+    print(f"Updated {update_count} StockItemHistory entries")
+
+
+def reverse_update(apps, schema_editor):
+    """
+    """
+    pass
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('stock', '0060_auto_20210511_1713'),
+    ]
+
+    operations = [
+        migrations.RunPython(update_history, reverse_code=reverse_update)
+    ]