reset opus-magnum sequence

polylan_submitter/opus_magnum/migrations/0019_reset_sequences.py

@@ -0,0 +1,33 @@
+# 0015 copied rows with their ids via raw INSERT ... SELECT *, which doesn't
+# bump postgres sequences -> new inserts collide on the pkey. Resync them.
+
+from django.core.management.color import no_style
+from django.db import migrations
+
+MODEL_NAMES = [
+    "SteamAPIKey",
+    "SteamCollection",
+    "SteamCollectionItem",
+    "Submission",
+    "PuzzleResponse",
+    "SubmissionFile",
+]
+
+
+def reset_sequences(apps, schema_editor):
+    connection = schema_editor.connection
+    models = [apps.get_model("opus_magnum", name) for name in MODEL_NAMES]
+    statements = connection.ops.sequence_reset_sql(no_style(), models)
+    with connection.cursor() as cursor:
+        for sql in statements:
+            cursor.execute(sql)
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("opus_magnum", "0018_event_required"),
+    ]
+
+    operations = [
+        migrations.RunPython(reset_sequences, migrations.RunPython.noop),
+    ]