Initial public commit

Daybook: a self-hosted, multi-user Django + DRF app where agents, scripts,
or people publish artifacts and each logged-in user browses their own
time-ordered, label-filterable feed.

This squashes prior local development history (kept privately on a separate
branch) into a single clean starting point for the public repository.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

artifacts/migrations/0010_backfill_sizes_and_profiles.py

@@ -0,0 +1,43 @@
+from pathlib import Path
+
+from django.conf import settings
+from django.db import migrations
+
+
+def backfill(apps, schema_editor):
+    Artifact = apps.get_model("artifacts", "Artifact")
+    User = apps.get_model("auth", "User")
+    UserProfile = apps.get_model("artifacts", "UserProfile")
+
+    root = Path(settings.ARTIFACTS_ROOT)
+    for artifact in Artifact.objects.all():
+        total = 0
+        primary = root / artifact.path
+        if primary.exists():
+            total += primary.stat().st_size
+        if artifact.kind == "markdown":
+            sidecar = primary.with_suffix(".md")
+            if sidecar.exists():
+                total += sidecar.stat().st_size
+        if artifact.size_bytes != total:
+            artifact.size_bytes = total
+            artifact.save(update_fields=["size_bytes"])
+
+    default_quota = 1024 * 1024 * 1024  # 1 GB
+    for user in User.objects.all():
+        UserProfile.objects.get_or_create(user=user, defaults={"quota_bytes": default_quota})
+
+
+def noop_reverse(apps, schema_editor):
+    pass
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("artifacts", "0009_quota_and_keep"),
+    ]
+
+    operations = [
+        migrations.RunPython(backfill, noop_reverse),
+    ]