PostgreSQL arrays (e.g., text []) are marked as errors by dbdiagram.io. They’ve been around since version 7. Recognizing arrays is absolutely critical to my schemas (and to my continued use of dbdiagram.io)!
You can try again with text[].
On the other hand, you can use a workaround for un-supported settings by adding the setting name into the column type name, such as name “text []”.