diff --git a/bayer/migrations/0003_package_data_pool.py b/bayer/migrations/0003_package_data_pool.py
new file mode 100644
index 00000000..35d2b433
--- /dev/null
+++ b/bayer/migrations/0003_package_data_pool.py
@@ -0,0 +1,20 @@
+# Generated by Django 6.0.3 on 2026-04-14 19:07
+
+import django.db.models.deletion
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('bayer', '0002_initial'),
+        ('epdb', '0023_alter_compoundstructure_options_and_more'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='package',
+            name='data_pool',
+            field=models.ForeignKey(blank=True, default=None, null=True, on_delete=django.db.models.deletion.SET_NULL, to='epdb.group', verbose_name='Data pool'),
+        ),
+    ]
diff --git a/bayer/models.py b/bayer/models.py
index 07f499da..aa075692 100644
--- a/bayer/models.py
+++ b/bayer/models.py
@@ -29,6 +29,9 @@ class Package(EnviPathModel):
         default=Classification.RESTRICTED,
     )
 
+    data_pool = models.ForeignKey("epdb.Group", on_delete=models.SET_NULL, blank=True, null=True,
+                                  verbose_name="Data pool", default=None)
+
     def delete(self, *args, **kwargs):
         # explicitly handle related Rules
         for r in self.rules.all():
diff --git a/epdb/migrations/0023_alter_compoundstructure_options_and_more.py b/epdb/migrations/0023_alter_compoundstructure_options_and_more.py
new file mode 100644
index 00000000..af9d5559
--- /dev/null
+++ b/epdb/migrations/0023_alter_compoundstructure_options_and_more.py
@@ -0,0 +1,50 @@
+# Generated by Django 6.0.3 on 2026-04-14 19:07
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('epdb', '0022_alter_classifierpluginmodel_data_packages_and_more'),
+    ]
+
+    operations = [
+        migrations.AlterModelOptions(
+            name='compoundstructure',
+            options={},
+        ),
+        migrations.AlterModelOptions(
+            name='epmodel',
+            options={},
+        ),
+        migrations.AlterModelOptions(
+            name='parallelrule',
+            options={},
+        ),
+        migrations.AlterModelOptions(
+            name='rule',
+            options={},
+        ),
+        migrations.AlterModelOptions(
+            name='sequentialrule',
+            options={},
+        ),
+        migrations.AlterModelOptions(
+            name='simpleambitrule',
+            options={},
+        ),
+        migrations.AlterModelOptions(
+            name='simplerdkitrule',
+            options={},
+        ),
+        migrations.AlterModelOptions(
+            name='simplerule',
+            options={},
+        ),
+        migrations.AddField(
+            model_name='group',
+            name='secret',
+            field=models.BooleanField(default=False, verbose_name='Secret Group'),
+        ),
+    ]
diff --git a/epdb/models.py b/epdb/models.py
index 30d7b200..cf1b71a8 100644
--- a/epdb/models.py
+++ b/epdb/models.py
@@ -203,6 +203,7 @@ class Group(TimeStampedModel):
     name = models.TextField(blank=False, null=False, verbose_name="Group name")
     owner = models.ForeignKey("User", verbose_name="Group Owner", on_delete=models.CASCADE)
     public = models.BooleanField(verbose_name="Public Group", default=False)
+    secret = models.BooleanField(verbose_name="Secret Group", default=False)
     description = models.TextField(
         blank=False, null=False, verbose_name="Descriptions", default="no description"
     )