Added id to sessions for consistency

migrations/20250914121222_main.up.sql

@@ -15,6 +15,7 @@ CREATE TABLE IF NOT EXISTS users (
 );
 
 CREATE TABLE IF NOT EXISTS sessions (
+    id BIGSERIAL NOT NULL PRIMARY KEY,
     user_id BIGINT NOT NULL,
     session_key TEXT NOT NULL UNIQUE,
     expires BIGINT NOT NULL,