save play session summary on each change

guild/admin.py

@@ -1,3 +1,19 @@
 from django.contrib import admin
+from guild.models import (
+    Adventure,
+    Character,
+    Player,
+    Reward,
+    Resource,
+    PlaySession,
+    PlaySessionSummaryVersion,
+)
 
 # Register your models here.
+admin.site.register(Adventure)
+admin.site.register(Character)
+admin.site.register(Player)
+admin.site.register(Reward)
+admin.site.register(Resource)
+admin.site.register(PlaySession)
+admin.site.register(PlaySessionSummaryVersion)

guild/migrations/0010_playsessionsummaryversion.py

@@ -0,0 +1,46 @@
+# Generated by Django 4.2.1 on 2023-06-22 18:40
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("guild", "0009_rename_resourceearned_reward_alter_reward_options"),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name="PlaySessionSummaryVersion",
+            fields=[
+                (
+                    "id",
+                    models.BigAutoField(
+                        auto_created=True,
+                        primary_key=True,
+                        serialize=False,
+                        verbose_name="ID",
+                    ),
+                ),
+                ("summary", models.TextField()),
+                (
+                    "created_at",
+                    models.DateTimeField(auto_now_add=True, verbose_name="created at"),
+                ),
+                (
+                    "playsession",
+                    models.ForeignKey(
+                        null=True,
+                        on_delete=django.db.models.deletion.SET_NULL,
+                        to="guild.playsession",
+                        verbose_name="playsession",
+                    ),
+                ),
+            ],
+            options={
+                "verbose_name": "playsession summary version",
+                "verbose_name_plural": "playsession summary versions",
+                "ordering": ["-created_at"],
+            },
+        ),
+    ]

guild/models.py

@@ -132,6 +132,36 @@ class PlaySession(models.Model):
             + str(self.pk)
         )
 
+    def save(self, *args, **kwargs):
+        super().save(*args, **kwargs)
+        PlaySessionSummaryVersion.objects.create(
+            playsession=self,
+            summary=self.summary,
+        )
+
+
+class PlaySessionSummaryVersion(models.Model):
+    playsession = models.ForeignKey(
+        "PlaySession",
+        verbose_name=_("playsession"),
+        on_delete=models.SET_NULL,
+        null=True,
+    )
+    summary = models.TextField()
+
+    created_at = models.DateTimeField(_("created at"), auto_now_add=True)
+
+    class Meta:
+        verbose_name = _("playsession summary version")
+        verbose_name_plural = _("playsession summary versions")
+        ordering = ["-created_at"]
+
+    def __str__(self):
+        return f"{self.playsession} - {self.created_at}"
+
+    def get_absolute_url(self):
+        return reverse("guild:playsession_detail", kwargs={"pk": self.playsession.pk})
+
 
 class Reward(models.Model):
     resource = models.ForeignKey(