Add new model "NotificationEntry"

- Keep track of past notifications

InvenTree/common/migrations/0012_notificationentry.py

@@ -0,0 +1,25 @@
+# Generated by Django 3.2.5 on 2021-11-03 13:54
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('common', '0011_auto_20210722_2114'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='NotificationEntry',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('key', models.CharField(max_length=250)),
+                ('uid', models.IntegerField()),
+                ('updated', models.DateTimeField(auto_now=True)),
+            ],
+            options={
+                'unique_together': {('key', 'uid')},
+            },
+        ),
+    ]

InvenTree/common/models.py

@@ -1226,3 +1226,34 @@ class ColorTheme(models.Model):
                 return True
 
         return False
+
+
+class NotificationEntry(models.Model):
+    """
+    A NotificationEntry records the last time a particular notifaction was sent out.
+
+    It is recorded to ensure that notifications are not sent out "too often" to users.
+
+    Attributes:
+    - key: A text entry describing the notification e.g. 'part.notify_low_stock'
+    - uid: An (optional) numerical ID for a particular instance
+    - date: The last time this notification was sent
+    """
+
+    class Meta:
+        unique_together = [
+            ('key', 'uid'),
+        ]
+
+    key = models.CharField(
+        max_length=250,
+        blank=False,
+    )
+
+    uid = models.IntegerField(
+    )
+
+    updated = models.DateTimeField(
+        auto_now=True,
+        null=False,
+    )