feat(v2): add multiple extra features from the pdf slides

backend/processing/migrations/0002_imagestate.py

@@ -0,0 +1,51 @@
+import django.db.models.deletion
+import uuid
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("processing", "0001_initial"),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name="ImageState",
+            fields=[
+                ("id", models.UUIDField(default=uuid.uuid4, editable=False, primary_key=True, serialize=False)),
+                ("sequence", models.PositiveIntegerField(default=0)),
+                ("label", models.CharField(max_length=120)),
+                ("operation", models.CharField(max_length=96)),
+                ("params", models.JSONField(blank=True, default=dict)),
+                ("image", models.CharField(max_length=255)),
+                ("width", models.PositiveIntegerField()),
+                ("height", models.PositiveIntegerField()),
+                ("channels", models.PositiveSmallIntegerField()),
+                ("color_mode", models.CharField(max_length=16)),
+                ("histogram", models.JSONField(default=dict)),
+                ("created_at", models.DateTimeField(auto_now_add=True)),
+                (
+                    "parent",
+                    models.ForeignKey(
+                        blank=True,
+                        null=True,
+                        on_delete=django.db.models.deletion.SET_NULL,
+                        related_name="children",
+                        to="processing.imagestate",
+                    ),
+                ),
+                (
+                    "session",
+                    models.ForeignKey(
+                        on_delete=django.db.models.deletion.CASCADE,
+                        related_name="states",
+                        to="processing.imagesession",
+                    ),
+                ),
+            ],
+            options={
+                "ordering": ["sequence", "created_at"],
+            },
+        ),
+    ]