phase3: add normalized domain schema, admin, services, and multistage docker build

apps/providers/migrations/0001_initial.py

@@ -0,0 +1,35 @@
+# Generated by Django 5.2.12 on 2026-03-10 09:33
+
+import django.db.models.deletion
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    initial = True
+
+    dependencies = [
+        ('contenttypes', '0002_remove_content_type_name'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='ExternalMapping',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('provider_namespace', models.CharField(max_length=80)),
+                ('external_id', models.CharField(max_length=160)),
+                ('external_secondary_id', models.CharField(blank=True, max_length=160)),
+                ('object_id', models.PositiveBigIntegerField()),
+                ('raw_payload', models.JSONField(blank=True, default=dict)),
+                ('last_seen_at', models.DateTimeField(auto_now=True)),
+                ('is_active', models.BooleanField(default=True)),
+                ('created_at', models.DateTimeField(auto_now_add=True)),
+                ('content_type', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='contenttypes.contenttype')),
+            ],
+            options={
+                'indexes': [models.Index(fields=['provider_namespace', 'external_id'], name='providers_e_provide_8e3a4f_idx'), models.Index(fields=['content_type', 'object_id'], name='providers_e_content_f29ca2_idx'), models.Index(fields=['is_active'], name='providers_e_is_acti_8ef53c_idx')],
+                'constraints': [models.UniqueConstraint(fields=('provider_namespace', 'external_id'), name='uq_mapping_provider_external_id'), models.UniqueConstraint(fields=('provider_namespace', 'content_type', 'object_id'), name='uq_mapping_provider_entity')],
+            },
+        ),
+    ]