feat: add community contribution ranks

apps/gamification/migrations/0001_initial.py

@@ -0,0 +1,47 @@
+# Generated by Django 5.2.5 on 2026-09-29 12:54
+
+import django.db.models.deletion
+import uuid
+from django.conf import settings
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    initial = True
+
+    dependencies = [
+        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='ScoringEpoch',
+            fields=[
+                ('id', models.PositiveSmallIntegerField(default=1, editable=False, primary_key=True, serialize=False)),
+                ('started_at', models.DateTimeField()),
+            ],
+        ),
+        migrations.CreateModel(
+            name='ContributionLedger',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('activity', models.CharField(choices=[('attendance', 'Event attendance'), ('post', 'Published post'), ('comment', 'Approved comment or reply'), ('like', 'Like given or received'), ('save', 'Save given or received')], max_length=20)),
+                ('source_type', models.CharField(max_length=32)),
+                ('source_id', models.CharField(max_length=80)),
+                ('effect_key', models.CharField(db_index=True, max_length=240)),
+                ('role', models.CharField(max_length=20)),
+                ('points', models.IntegerField()),
+                ('idempotency_key', models.UUIDField(default=uuid.uuid4, editable=False, unique=True)),
+                ('reason', models.CharField(blank=True, max_length=120)),
+                ('created_at', models.DateTimeField(auto_now_add=True)),
+                ('reversal_of', models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.PROTECT, related_name='reversals', to='gamification.contributionledger')),
+                ('user', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='contribution_ledger_entries', to=settings.AUTH_USER_MODEL)),
+            ],
+            options={
+                'ordering': ['created_at', 'id'],
+                'indexes': [models.Index(fields=['user', 'activity'], name='gamificatio_user_id_860de2_idx'), models.Index(fields=['source_type', 'source_id'], name='gamificatio_source__6d5f84_idx')],
+                'constraints': [models.CheckConstraint(condition=models.Q(('points', 0), _negated=True), name='gamification_nonzero_ledger_points')],
+            },
+        ),
+    ]