v0.2 Preview: Construction Plan.

backend/engagement/admin.py

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+from django.contrib import admin
+
+# Register your models here.

backend/engagement/apps.py

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+from django.apps import AppConfig
+
+
+class EngagementConfig(AppConfig):
+    default_auto_field = 'django.db.models.BigAutoField'
+    name = 'engagement'

backend/engagement/migrations/0001_initial.py

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+# Generated by Django 4.2.23 on 2026-08-08 11:15
+
+from django.conf import settings
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    initial = True
+
+    dependencies = [
+        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='Notification',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('category', models.CharField(max_length=40)),
+                ('title', models.CharField(max_length=120)),
+                ('body', models.TextField()),
+                ('is_read', models.BooleanField(default=False)),
+                ('created_at', models.DateTimeField(auto_now_add=True)),
+                ('user', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='notifications', to=settings.AUTH_USER_MODEL)),
+            ],
+        ),
+        migrations.CreateModel(
+            name='DailyCheckIn',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('date', models.DateField()),
+                ('streak', models.PositiveIntegerField(default=1)),
+                ('reward', models.JSONField(default=dict)),
+                ('created_at', models.DateTimeField(auto_now_add=True)),
+                ('user', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='checkins', to=settings.AUTH_USER_MODEL)),
+            ],
+        ),
+        migrations.AddConstraint(
+            model_name='dailycheckin',
+            constraint=models.UniqueConstraint(fields=('user', 'date'), name='unique_user_daily_checkin'),
+        ),
+    ]

backend/engagement/models.py

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+from django.conf import settings
+from django.db import models
+
+
+class DailyCheckIn(models.Model):
+    user = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE, related_name="checkins")
+    date = models.DateField()
+    streak = models.PositiveIntegerField(default=1)
+    reward = models.JSONField(default=dict)
+    created_at = models.DateTimeField(auto_now_add=True)
+
+    class Meta:
+        constraints = [
+            models.UniqueConstraint(fields=("user", "date"), name="unique_user_daily_checkin")
+        ]
+
+
+class Notification(models.Model):
+    user = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE, related_name="notifications")
+    category = models.CharField(max_length=40)
+    title = models.CharField(max_length=120)
+    body = models.TextField()
+    is_read = models.BooleanField(default=False)
+    created_at = models.DateTimeField(auto_now_add=True)

backend/engagement/tests.py

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+from django.test import TestCase
+
+# Create your tests here.

backend/engagement/views.py

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+from django.shortcuts import render
+
+# Create your views here.