diff --git a/backend/migrations/202511010002_set_assigned_by_on_delete_set_null/down.sql b/backend/migrations/202511010002_set_assigned_by_on_delete_set_null/down.sql
new file mode 100644
index 0000000..58f08d3
--- /dev/null
+++ b/backend/migrations/202511010002_set_assigned_by_on_delete_set_null/down.sql
@@ -0,0 +1,13 @@
+ALTER TABLE tenant.document_tags
+    DROP CONSTRAINT IF EXISTS document_tags_assigned_by_fkey,
+    ADD CONSTRAINT document_tags_assigned_by_fkey
+        FOREIGN KEY (assigned_by)
+        REFERENCES shared.users (id)
+        ON DELETE NO ACTION;
+
+ALTER TABLE tenant.document_correspondents
+    DROP CONSTRAINT IF EXISTS document_correspondents_assigned_by_fkey,
+    ADD CONSTRAINT document_correspondents_assigned_by_fkey
+        FOREIGN KEY (assigned_by)
+        REFERENCES shared.users (id)
+        ON DELETE NO ACTION;
diff --git a/backend/migrations/202511010002_set_assigned_by_on_delete_set_null/up.sql b/backend/migrations/202511010002_set_assigned_by_on_delete_set_null/up.sql
new file mode 100644
index 0000000..cbdf1db
--- /dev/null
+++ b/backend/migrations/202511010002_set_assigned_by_on_delete_set_null/up.sql
@@ -0,0 +1,13 @@
+ALTER TABLE tenant.document_tags
+    DROP CONSTRAINT IF EXISTS document_tags_assigned_by_fkey,
+    ADD CONSTRAINT document_tags_assigned_by_fkey
+        FOREIGN KEY (assigned_by)
+        REFERENCES shared.users (id)
+        ON DELETE SET NULL;
+
+ALTER TABLE tenant.document_correspondents
+    DROP CONSTRAINT IF EXISTS document_correspondents_assigned_by_fkey,
+    ADD CONSTRAINT document_correspondents_assigned_by_fkey
+        FOREIGN KEY (assigned_by)
+        REFERENCES shared.users (id)
+        ON DELETE SET NULL;