You can create custom tables in the database, however do not use any name any table currently in place or similar as the entire backend SQL database is being reworked. If you have to add anything custom, use a common name for all tables like Custom-TableName to easily identify the tables/views or Stored Procedures that you may create. We have had customers create tables, viwes and stored procedures for various tasks. As long as you are not attempting to restructure the database or change anything that the products created you are fine to customize.
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