Index the enddate field on Conferences

We quite often query or sort by enddate, so a cheap index on a table
that's very seldom updated is a good idea.

Author: mhagander

postgresqleu/confreg/migrations/0125_index_conference_enddate.py

@@ -0,0 +1,18 @@
+# Generated by Django 4.2.11 on 2026-02-09 12:23
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('confreg', '0124_attendeemail_extracontext'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='conference',
+            name='enddate',
+            field=models.DateField(db_index=True, verbose_name='End date'),
+        ),
+    ]

postgresqleu/confreg/models.py

@@ -165,7 +165,7 @@ class Conference(models.Model):
     urlname = models.CharField(max_length=32, blank=False, null=False, unique=True, validators=[validate_lowercase, validate_urlname, ], verbose_name="URL name")
     conferencename = models.CharField(max_length=64, blank=False, null=False, verbose_name="Conference name")
     startdate = models.DateField(blank=False, null=False, verbose_name="Start date", db_index=True)
-    enddate = models.DateField(blank=False, null=False, verbose_name="End date")
+    enddate = models.DateField(blank=False, null=False, verbose_name="End date", db_index=True)
     location = models.CharField(max_length=128, blank=False, null=False)
     promoactive = models.BooleanField(default=False, verbose_name="Promotion active")
     promopicurl = models.URLField(blank=True, null=False, verbose_name="URL to promo picture", validators=[PictureUrlValidator(aspect=2.3)])