fix(db): make schema.sql accuratley reflect latest patch state

lib/db/mysql/schema.sql

@@ -41,7 +41,7 @@ CREATE TABLE IF NOT EXISTS tokens (
   FOREIGN KEY (clientId) REFERENCES clients(id) ON DELETE CASCADE,
   userId BINARY(16) NOT NULL,
   INDEX tokens_user_id(userId),
-  email VARCHAR(256),
+  email VARCHAR(256) NOT NULL,
   type VARCHAR(16) NOT NULL,
   scope VARCHAR(256) NOT NULL,
   createdAt TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,