diff --git a/bin/start-backend b/bin/start-backend
index 3926df3fd0b..56bdc6aecb4 100755
--- a/bin/start-backend
+++ b/bin/start-backend
@@ -1,4 +1,4 @@
 #!/bin/bash
 set -e
 
-python manage.py runserver
\ No newline at end of file
+python3 manage.py runserver
\ No newline at end of file
diff --git a/latest_migrations.manifest b/latest_migrations.manifest
index 51a9acc5373..c6a1e3af468 100644
--- a/latest_migrations.manifest
+++ b/latest_migrations.manifest
@@ -3,7 +3,7 @@ auth: 0012_alter_user_first_name_max_length
 axes: 0006_remove_accesslog_trusted
 contenttypes: 0002_remove_content_type_name
 ee: 0005_project_based_permissioning
-posthog: 0179_add_group_type_mapping
+posthog: 0180_person_version
 rest_hooks: 0002_swappable_hook_model
 sessions: 0001_initial
 social_django: 0010_uid_db_index
diff --git a/posthog/migrations/0180_person_version.py b/posthog/migrations/0180_person_version.py
new file mode 100644
index 00000000000..134b562253b
--- /dev/null
+++ b/posthog/migrations/0180_person_version.py
@@ -0,0 +1,14 @@
+# Generated by Django 3.2.5 on 2021-10-25 11:26
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("posthog", "0179_add_group_type_mapping"),
+    ]
+
+    operations = [
+        migrations.AddField(model_name="person", name="version", field=models.BigIntegerField(blank=True, null=True),)
+    ]
diff --git a/posthog/models/person.py b/posthog/models/person.py
index 13e08ea7eef..a4bf8656d24 100644
--- a/posthog/models/person.py
+++ b/posthog/models/person.py
@@ -78,6 +78,9 @@ class Person(models.Model):
     is_identified: models.BooleanField = models.BooleanField(default=False)
     uuid = models.UUIDField(db_index=True, default=UUIDT, editable=False)
 
+    # current version of the person, used to sync with ClickHouse and collapse rows correctly
+    version: models.BigIntegerField = models.BigIntegerField(null=True, blank=True)
+
     # Has an index on properties -> email from migration 0121, (team_id, id DESC) from migration 0164