diff --git a/backend/src/main/resources/db/migration/V3__unique_admin_social.sql b/backend/src/main/resources/db/migration/V3__unique_admin_social.sql
new file mode 100644
index 000000000..2b47d2cd6
--- /dev/null
+++ b/backend/src/main/resources/db/migration/V3__unique_admin_social.sql
@@ -0,0 +1,5 @@
+alter table admin
+    add constraint UNIQUE_USERNAME unique (username);
+
+alter table member
+    add constraint UNIQUE_SOCIAL unique (social_id, social_type);