Add an index to the timestamp column (#364)

Many queries, including the default ordering, for the LogEntry
model rely on the timestamp field. Adding an index will ensure
reasonable scalability for large audit logs.

CHANGELOG.md

@@ -2,6 +2,7 @@
 
 #### Improvements
 
+- feat: Add db_index to the `LogEntry.timestamp` column ([#364](https://github.com/jazzband/django-auditlog/pull/364))
 - feat: Add register model from settings ([#368](https://github.com/jazzband/django-auditlog/pull/368))
 - Context manager set_actor() for use in Celery tasks ([#262](https://github.com/jazzband/django-auditlog/pull/262))
 

auditlog/migrations/0010_alter_logentry_timestamp.py

@@ -0,0 +1,20 @@
+# Generated by Django 4.0.3 on 2022-03-11 23:16
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("auditlog", "0009_alter_logentry_additional_data"),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name="logentry",
+            name="timestamp",
+            field=models.DateTimeField(
+                auto_now_add=True, db_index=True, verbose_name="timestamp"
+            ),
+        ),
+    ]

auditlog/models.py

@@ -220,7 +220,9 @@ class LogEntry(models.Model):
     remote_addr = models.GenericIPAddressField(
         blank=True, null=True, verbose_name=_("remote address")
     )
-    timestamp = models.DateTimeField(auto_now_add=True, verbose_name=_("timestamp"))
+    timestamp = models.DateTimeField(
+        db_index=True, auto_now_add=True, verbose_name=_("timestamp")
+    )
     additional_data = models.JSONField(
         blank=True, null=True, verbose_name=_("additional data")
     )