diff --git a/migrations/003-users-unique.sql b/migrations/003-users-unique.sql
new file mode 100644
index 00000000..0ac56285
--- /dev/null
+++ b/migrations/003-users-unique.sql
@@ -0,0 +1,9 @@
+-- Up
+
+CREATE UNIQUE INDEX "users_username" ON "users" ("username");
+CREATE UNIQUE INDEX "users_email" ON "users" ("email");
+
+-- Down
+
+DROP INDEX "users_email";
+DROP INDEX "users_username";