*api-gateway - typescript nodejs - all request goes through this - and it's resposible for orchestrating authentication and authorization
*user-auth - typescript nodejs - user-auth service maintains users and authentication and authorization
*book - golang - book service maintains books and authors
*library - golang - library service maintains book loans
1.Improve excel export by using worker process to generate excel and generate at timeinterval ex-hourly,
save the file and serve that saved file, NOT ON REQUEST TRANSACTION
2.Implement saga to maintain bookloans data consistency in (Book & Library) service