Add project schema version

clips/migrations/0006_project_schema_version.py

@@ -0,0 +1,15 @@
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("clips", "0005_footage_stream_alter_footage_video"),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name="project",
+            name="schema_version",
+            field=models.PositiveIntegerField(default=1),
+        ),
+    ]

clips/models.py

@@ -199,14 +199,14 @@ class Block(models.Model):
 class Project(models.Model):
     """Tier 1: the document's root.
 
-    `seq` is the monotonic project version docs/architecture.md asks for. Every
-    write bumps it, and a client that sees `seq > local + 1` refetches — which is
-    what makes staleness self-healing rather than permanent once there is a
-    broadcast to miss.
+    `schema_version` identifies the stored document format. `seq` counts writes
+    to this particular project; it is not a format version. Every write bumps
+    `seq`, and a client that sees `seq > local + 1` refetches once broadcasts exist.
     """
 
     id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
     name = models.CharField(max_length=200, default="untitled")
+    schema_version = models.PositiveIntegerField(default=1)
     seq = models.PositiveBigIntegerField(default=0)
     palette = models.CharField(max_length=64, default="arthur/default")
     created = models.DateTimeField(auto_now_add=True)

clips/tests/test_api.py

@@ -379,6 +379,7 @@ class DocumentTests(TestCase):
         self.assertEqual(5, len(response.json()["written"]))
 
         loaded = self.client.get(f"/api/projects/{self.project.id}").json()
+        self.assertEqual(1, loaded["schema_version"])
         self.assertEqual(1, len(loaded["clips"]))
         clip = loaded["clips"][0]
         self.assertEqual("c1", clip["cid"])

clips/views.py

@@ -571,6 +571,7 @@ def _project_json(project: Project):
     return {
         "id": str(project.id),
         "name": project.name,
+        "schema_version": project.schema_version,
         "seq": project.seq,
         "palette": project.palette,
         "clips": clips,
@@ -583,7 +584,8 @@ def projects(request):
         return JsonResponse(
             {
                 "projects": [
-                    {"id": str(p.id), "name": p.name, "seq": p.seq,
+                    {"id": str(p.id), "name": p.name,
+                     "schema_version": p.schema_version, "seq": p.seq,
                      "updated": p.updated.isoformat()}
                     for p in Project.objects.all()[:100]
                 ]
@@ -690,6 +692,7 @@ def _save(project: Project, data):
     return JsonResponse(
         {
             "id": str(project.id),
+            "schema_version": project.schema_version,
             "seq": seq,
             "written": sorted(written),
             "removed": sorted(removed),