Could not reflect the database: Too many tables in datasource. Max is 1000

Chartio limits the number of tables in a database schema to 1,000 and the number of total columns to 10,000.  It is very unlikely that your organization would want to visualize data from all of the tables in your database.  There is likely a subset of tables or views that you will be reporting on.

The best way to resolve this issue is to grant the database user Chartio will be using access to only the tables and views you would like to report on.  For more information see the article on limiting user access to certain tables.