migrations: Squash most confirmation migrations.

Generated using the squashmigrations tool, with:

- A tiny Django patch to avoid special handling of the temporary
  EmailChangeStatus proxy model.
- Switching AddIndexConcurrently to AddIndex to help squashing. This
  may not have been necessary.

Migration 0015 was not squashed because of its dependency on newer
zerver migrations.

confirmation/migrations/0001_squashed_0014_confirmation_confirmatio_content_80155a_idx.py

@@ -0,0 +1,90 @@
+# Generated by Django 5.0.7 on 2024-08-13 19:41
+
+import django.db.models.deletion
+import django.utils.timezone
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+    replaces = [
+        ("confirmation", "0001_initial"),
+        ("confirmation", "0002_realmcreationkey"),
+        ("confirmation", "0003_emailchangeconfirmation"),
+        ("confirmation", "0004_remove_confirmationmanager"),
+        ("confirmation", "0005_confirmation_realm"),
+        ("confirmation", "0006_realmcreationkey_presume_email_valid"),
+        ("confirmation", "0007_add_indexes"),
+        ("confirmation", "0008_confirmation_expiry_date"),
+        ("confirmation", "0009_confirmation_expiry_date_backfill"),
+        ("confirmation", "0010_alter_confirmation_expiry_date"),
+        ("confirmation", "0011_alter_confirmation_expiry_date"),
+        ("confirmation", "0012_alter_confirmation_id"),
+        ("confirmation", "0013_alter_realmcreationkey_id"),
+        ("confirmation", "0014_confirmation_confirmatio_content_80155a_idx"),
+    ]
+
+    initial = True
+
+    dependencies = [
+        ("contenttypes", "0001_initial"),
+        ("zerver", "0001_initial"),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name="RealmCreationKey",
+            fields=[
+                (
+                    "id",
+                    models.BigAutoField(
+                        auto_created=True, primary_key=True, serialize=False, verbose_name="ID"
+                    ),
+                ),
+                (
+                    "creation_key",
+                    models.CharField(db_index=True, max_length=40, verbose_name="activation key"),
+                ),
+                (
+                    "date_created",
+                    models.DateTimeField(default=django.utils.timezone.now, verbose_name="created"),
+                ),
+                ("presume_email_valid", models.BooleanField(default=False)),
+            ],
+        ),
+        migrations.CreateModel(
+            name="Confirmation",
+            fields=[
+                (
+                    "id",
+                    models.BigAutoField(
+                        auto_created=True, primary_key=True, serialize=False, verbose_name="ID"
+                    ),
+                ),
+                ("object_id", models.PositiveIntegerField(db_index=True)),
+                ("date_sent", models.DateTimeField(db_index=True)),
+                ("confirmation_key", models.CharField(db_index=True, max_length=40)),
+                (
+                    "content_type",
+                    models.ForeignKey(
+                        on_delete=django.db.models.deletion.CASCADE, to="contenttypes.contenttype"
+                    ),
+                ),
+                ("type", models.PositiveSmallIntegerField()),
+                (
+                    "realm",
+                    models.ForeignKey(
+                        null=True, on_delete=django.db.models.deletion.CASCADE, to="zerver.realm"
+                    ),
+                ),
+                ("expiry_date", models.DateTimeField(db_index=True, null=True)),
+            ],
+            options={
+                "unique_together": {("type", "confirmation_key")},
+                "indexes": [
+                    models.Index(
+                        fields=["content_type", "object_id"], name="confirmatio_content_80155a_idx"
+                    )
+                ],
+            },
+        ),
+    ]