feat: add events app + "multi-tenants" aka multi-events

polylan_submitter/opus_magnum/migrations/0015_migrate_data_from_submissions.py

@@ -3,45 +3,31 @@
 from django.db import migrations
 
 
+TABLE_PAIRS = [
+    ("submissions_steamapikey", "opus_magnum_steamapikey"),
+    ("submissions_steamcollection", "opus_magnum_steamcollection"),
+    ("submissions_steamcollectionitem", "opus_magnum_steamcollectionitem"),
+    ("submissions_submission", "opus_magnum_submission"),
+    ("submissions_puzzleresponse", "opus_magnum_puzzleresponse"),
+    ("submissions_submissionfile", "opus_magnum_submissionfile"),
+]
+
+
 def migrate_data_forward(apps, schema_editor):
-    """Copy data from submissions_* tables to opus_magnum_* tables"""
-    # Use raw SQL to copy data while preserving all fields
+    """Copy data from submissions_* tables to opus_magnum_* tables.
+
+    The source tables only exist on databases that predate the submissions ->
+    opus_magnum rename; a database built fresh from this migration history
+    never has them, so skip pairs whose source table is absent instead of
+    failing.
+    """
+    existing_tables = set(schema_editor.connection.introspection.table_names())
+
     with schema_editor.connection.cursor() as cursor:
-        # Copy SteamAPIKey
-        cursor.execute("""
-            INSERT INTO opus_magnum_steamapikey
-            SELECT * FROM submissions_steamapikey
-        """)
-
-        # Copy SteamCollection
-        cursor.execute("""
-            INSERT INTO opus_magnum_steamcollection
-            SELECT * FROM submissions_steamcollection
-        """)
-
-        # Copy SteamCollectionItem
-        cursor.execute("""
-            INSERT INTO opus_magnum_steamcollectionitem
-            SELECT * FROM submissions_steamcollectionitem
-        """)
-
-        # Copy Submission
-        cursor.execute("""
-            INSERT INTO opus_magnum_submission
-            SELECT * FROM submissions_submission
-        """)
-
-        # Copy PuzzleResponse
-        cursor.execute("""
-            INSERT INTO opus_magnum_puzzleresponse
-            SELECT * FROM submissions_puzzleresponse
-        """)
-
-        # Copy SubmissionFile
-        cursor.execute("""
-            INSERT INTO opus_magnum_submissionfile
-            SELECT * FROM submissions_submissionfile
-        """)
+        for source, dest in TABLE_PAIRS:
+            if source not in existing_tables:
+                continue
+            cursor.execute(f"INSERT INTO {dest} SELECT * FROM {source}")
 
 
 def migrate_data_backward(apps, schema_editor):

polylan_submitter/opus_magnum/migrations/0016_steamcollection_event_submission_event.py

@@ -0,0 +1,34 @@
+# Generated by Django 6.0.5 on 2026-09-15 21:09
+
+import django.db.models.deletion
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("events", "0002_seed_polylan_43"),
+        ("opus_magnum", "0015_migrate_data_from_submissions"),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name="steamcollection",
+            name="event",
+            field=models.ForeignKey(
+                null=True,
+                on_delete=django.db.models.deletion.CASCADE,
+                related_name="steam_collections",
+                to="events.event",
+            ),
+        ),
+        migrations.AddField(
+            model_name="submission",
+            name="event",
+            field=models.ForeignKey(
+                null=True,
+                on_delete=django.db.models.deletion.CASCADE,
+                related_name="opus_magnum_submissions",
+                to="events.event",
+            ),
+        ),
+    ]

polylan_submitter/opus_magnum/migrations/0017_backfill_event.py

@@ -0,0 +1,27 @@
+from django.db import migrations
+
+EVENT_PATH = "polylan-43"
+
+
+def backfill_event(apps, schema_editor):
+    Event = apps.get_model("events", "Event")
+    SteamCollection = apps.get_model("opus_magnum", "SteamCollection")
+    Submission = apps.get_model("opus_magnum", "Submission")
+    event = Event.objects.get(path=EVENT_PATH)
+    SteamCollection.objects.filter(event__isnull=True).update(event=event)
+    Submission.objects.filter(event__isnull=True).update(event=event)
+
+
+def noop(apps, schema_editor):
+    pass
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("opus_magnum", "0016_steamcollection_event_submission_event"),
+        ("events", "0002_seed_polylan_43"),
+    ]
+
+    operations = [
+        migrations.RunPython(backfill_event, noop),
+    ]

polylan_submitter/opus_magnum/migrations/0018_event_required.py

@@ -0,0 +1,29 @@
+import django.db.models.deletion
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("opus_magnum", "0017_backfill_event"),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name="steamcollection",
+            name="event",
+            field=models.ForeignKey(
+                on_delete=django.db.models.deletion.CASCADE,
+                related_name="steam_collections",
+                to="events.event",
+            ),
+        ),
+        migrations.AlterField(
+            model_name="submission",
+            name="event",
+            field=models.ForeignKey(
+                on_delete=django.db.models.deletion.CASCADE,
+                related_name="opus_magnum_submissions",
+                to="events.event",
+            ),
+        ),
+    ]