It's a trap (especially early in a project where a lot of things are simplified placeholders) to prematurely combine previously decoupled parts of a system due

It's a trap (especially early in a project where a lot of things are simplified placeholders) to prematurely combine previously decoupled parts of a system due to some superficial similarities. "Hey, so our 'customer' object and our 'stock_item' object both have ID, name, comment, and location code, we should have a 'handled_entity' table to store both of them." No, bad!