diff --git a/apis_instance_nsvis/migrations/0001_initial.py b/apis_instance_nsvis/migrations/0001_initial.py
index a269d8f..907be20 100644
--- a/apis_instance_nsvis/migrations/0001_initial.py
+++ b/apis_instance_nsvis/migrations/0001_initial.py
@@ -1,7 +1,6 @@
-# Generated by Django 5.1.2 on 2024-10-24 10:57
+# Generated by Django 5.1.2 on 2024-11-13 07:37
 
 import apis_core.generic.abc
-import apis_instance_nsvis.models
 import django.db.models.deletion
 import simple_history.models
 from django.conf import settings
@@ -40,7 +39,7 @@ class Migration(migrations.Migration):
             bases=('relations.relation',),
         ),
         migrations.CreateModel(
-            name='Collaboration',
+            name='CollaboratesWith',
             fields=[
                 ('relation_ptr', models.OneToOneField(auto_created=True, on_delete=django.db.models.deletion.CASCADE, parent_link=True, primary_key=True, serialize=False, to='relations.relation')),
             ],
@@ -55,17 +54,24 @@ class Migration(migrations.Migration):
             options={
                 'abstract': False,
             },
-            bases=('apis_metainfo.rootobject', models.Model, apis_instance_nsvis.models.MongoDbDataMixin),
+            bases=('apis_metainfo.rootobject', models.Model),
         ),
         migrations.CreateModel(
-            name='LivesIn',
+            name='IsInventoriedIn',
             fields=[
                 ('relation_ptr', models.OneToOneField(auto_created=True, on_delete=django.db.models.deletion.CASCADE, parent_link=True, primary_key=True, serialize=False, to='relations.relation')),
             ],
             bases=('relations.relation',),
         ),
         migrations.CreateModel(
-            name='Membership',
+            name='IsMemberOf',
+            fields=[
+                ('relation_ptr', models.OneToOneField(auto_created=True, on_delete=django.db.models.deletion.CASCADE, parent_link=True, primary_key=True, serialize=False, to='relations.relation')),
+            ],
+            bases=('relations.relation',),
+        ),
+        migrations.CreateModel(
+            name='LivesIn',
             fields=[
                 ('relation_ptr', models.OneToOneField(auto_created=True, on_delete=django.db.models.deletion.CASCADE, parent_link=True, primary_key=True, serialize=False, to='relations.relation')),
             ],
@@ -85,7 +91,7 @@ class Migration(migrations.Migration):
             options={
                 'abstract': False,
             },
-            bases=('apis_metainfo.rootobject', models.Model, apis_instance_nsvis.models.MongoDbDataMixin),
+            bases=('apis_metainfo.rootobject', models.Model),
         ),
         migrations.CreateModel(
             name='Place',
@@ -98,7 +104,7 @@ class Migration(migrations.Migration):
             options={
                 'abstract': False,
             },
-            bases=('apis_metainfo.rootobject', models.Model, apis_instance_nsvis.models.MongoDbDataMixin),
+            bases=('apis_metainfo.rootobject', models.Model),
         ),
         migrations.CreateModel(
             name='WorksIn',
@@ -113,8 +119,8 @@ class Migration(migrations.Migration):
                 ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
                 ('data', models.JSONField()),
                 ('filename', models.TextField(max_length=32)),
-                ('object_id', models.PositiveIntegerField()),
-                ('content_type', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='contenttypes.contenttype')),
+                ('object_id', models.PositiveIntegerField(null=True)),
+                ('content_type', models.ForeignKey(null=True, on_delete=django.db.models.deletion.CASCADE, to='contenttypes.contenttype')),
             ],
         ),
         migrations.CreateModel(
diff --git a/apis_instance_nsvis/migrations/0002_alter_mongodbmodel_content_type_and_more.py b/apis_instance_nsvis/migrations/0002_alter_mongodbmodel_content_type_and_more.py
deleted file mode 100644
index e6cdea5..0000000
--- a/apis_instance_nsvis/migrations/0002_alter_mongodbmodel_content_type_and_more.py
+++ /dev/null
@@ -1,25 +0,0 @@
-# Generated by Django 5.1.2 on 2024-11-11 09:26
-
-import django.db.models.deletion
-from django.db import migrations, models
-
-
-class Migration(migrations.Migration):
-
-    dependencies = [
-        ('apis_instance_nsvis', '0001_initial'),
-        ('contenttypes', '0002_remove_content_type_name'),
-    ]
-
-    operations = [
-        migrations.AlterField(
-            model_name='mongodbmodel',
-            name='content_type',
-            field=models.ForeignKey(null=True, on_delete=django.db.models.deletion.CASCADE, to='contenttypes.contenttype'),
-        ),
-        migrations.AlterField(
-            model_name='mongodbmodel',
-            name='object_id',
-            field=models.PositiveIntegerField(null=True),
-        ),
-    ]
diff --git a/apis_instance_nsvis/migrations/0003_rename_collaboration_collaborateswith.py b/apis_instance_nsvis/migrations/0003_rename_collaboration_collaborateswith.py
deleted file mode 100644
index a4585d9..0000000
--- a/apis_instance_nsvis/migrations/0003_rename_collaboration_collaborateswith.py
+++ /dev/null
@@ -1,18 +0,0 @@
-# Generated by Django 5.1.2 on 2024-11-13 07:05
-
-from django.db import migrations
-
-
-class Migration(migrations.Migration):
-
-    dependencies = [
-        ('apis_instance_nsvis', '0002_alter_mongodbmodel_content_type_and_more'),
-        ('relations', '0001_initial'),
-    ]
-
-    operations = [
-        migrations.RenameModel(
-            old_name='Collaboration',
-            new_name='CollaboratesWith',
-        ),
-    ]
diff --git a/apis_instance_nsvis/migrations/0004_rename_membership_ismemberof.py b/apis_instance_nsvis/migrations/0004_rename_membership_ismemberof.py
deleted file mode 100644
index a06efee..0000000
--- a/apis_instance_nsvis/migrations/0004_rename_membership_ismemberof.py
+++ /dev/null
@@ -1,18 +0,0 @@
-# Generated by Django 5.1.2 on 2024-11-13 07:05
-
-from django.db import migrations
-
-
-class Migration(migrations.Migration):
-
-    dependencies = [
-        ('apis_instance_nsvis', '0003_rename_collaboration_collaborateswith'),
-        ('relations', '0001_initial'),
-    ]
-
-    operations = [
-        migrations.RenameModel(
-            old_name='Membership',
-            new_name='IsMemberOf',
-        ),
-    ]