Not able to see my Query list and Alerts



Yesterday I was not able to run my queries and they were getting stuck in queue. So, I executed supervisorctl restart all and redash_supervisord restart . They got executed successfully and my queries no longer got stuck in queue and they started executing fine.
But, since then, I am not able to view my queries either in My Queries or All queries section on Redash. Even when I go to alerts section, it does not show me any alerts.
I have about 500 queries which are scheduled and run on daily basis.

When I try and create a new query, it does not show me list of my “Database sources” in “Data Source”

Please help.