Add indexes to speed up finding messages to process

src/smpp_gateway/migrations/0006_message_status_indexes.py

@@ -0,0 +1,29 @@
+# Generated by Django 4.2.13 on 2024-06-10 01:17
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("smpp_gateway", "0005_alter_mtmessagestatus_command_status"),
+    ]
+
+    operations = [
+        migrations.AddIndex(
+            model_name="momessage",
+            index=models.Index(
+                condition=models.Q(("status", "new")),
+                fields=["status"],
+                name="mo_message_status_idx",
+            ),
+        ),
+        migrations.AddIndex(
+            model_name="mtmessage",
+            index=models.Index(
+                condition=models.Q(("status", "new")),
+                fields=["status"],
+                name="mt_message_status_idx",
+            ),
+        ),
+    ]

src/smpp_gateway/models.py

@@ -46,6 +46,14 @@ def __str__(self):
 
     class Meta:
         verbose_name = _("mobile-originated message")
+        indexes = (
+            models.Index(
+                # Allow for quick filtering of messages that need to be processed
+                fields=["status"],
+                name="mo_message_status_idx",
+                condition=models.Q(status="new"),  # No way to access Status.NEW here?
+            ),
+        )
 
 
 class MTMessage(AbstractTimestampModel, models.Model):
@@ -77,6 +85,14 @@ def __str__(self):
 
     class Meta:
         verbose_name = _("mobile-terminated message")
+        indexes = (
+            models.Index(
+                # Allow for quick filtering of messages that need to be processed
+                fields=["status"],
+                name="mt_message_status_idx",
+                condition=models.Q(status="new"),  # No way to access Status.NEW here?
+            ),
+        )
 
 
 class MTMessageStatus(AbstractTimestampModel, models.Model):