diff --git a/postgres/schema.sql b/postgres/schema.sql
index c62f208..aff6d20 100644
--- a/postgres/schema.sql
+++ b/postgres/schema.sql
@@ -131,7 +131,8 @@ CREATE TABLE nodes (
 );
 
 CREATE TABLE roles (
-	email TEXT PRIMARY KEY,
+	-- email should always be lowercase since that's how the auth function compares it
+	email TEXT PRIMARY KEY CHECK email = lower(email),
 	name TEXT NOT NULL,
 	editor BOOLEAN NOT NULL DEFAULT FALSE,
 	artist BOOLEAN NOT NULL DEFAULT FALSE