feat(activities): Add Activity models

activities/admin.py

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

activities/apps.py

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+from django.apps import AppConfig
+
+
+class ActivitiesConfig(AppConfig):
+    name = 'activities'

activities/migrations/0001_initial.py

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+# Generated by Django 2.2.9 on 2020-02-14 09:47
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    initial = True
+
+    dependencies = [
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='ActivitySeries',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('name', models.CharField(max_length=1023)),
+            ],
+            options={
+                'verbose_name_plural': 'activity series',
+            },
+        ),
+        migrations.CreateModel(
+            name='Activity',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('name', models.CharField(max_length=1023)),
+                ('series', models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.PROTECT, related_name='instances', to='activities.ActivitySeries')),
+            ],
+            options={
+                'verbose_name_plural': 'activities',
+            },
+        ),
+    ]

activities/models.py

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+from django.db import models
+
+
+class ActivitySeries(models.Model):
+    """
+    A series of related :class:`Activity`s
+    """
+    
+    class Meta:
+        verbose_name_plural = 'activity series'
+
+    #: Name of activity series
+    name = models.CharField(max_length=1023,
+                            blank=False, null=False)
+
+
+class Activity(models.Model):
+    """
+    An instance of an activity - e.g. a workshop
+    """
+    
+    class Meta:
+        verbose_name_plural = 'activities'
+
+    #: Name of activity
+    name = models.CharField(max_length=1023,
+                            blank=False, null=False)
+
+    #: Optional :class:`ActivitySeries` to which this activity belongs
+    series = models.ForeignKey(ActivitySeries, related_name='instances',
+                               on_delete=models.PROTECT,
+                               blank=True, null=True)