Hey Peter,
this is suprisingly trickier than one might think, not from a technical point of view but rather semantic/organizational point.
What we have is this comment field for tables, which is first and foremost a comment field for your model (and the particular table). For that task the comment is not limited.
However, this comment is also synchronized to the schema and there it has a limit.
The validation feature in the SE version of MySQL Workbench can catch this case and warn if the comment is too long. OSS users have to take care themself. In order to help managing that we will change the handling for this comment. Only the first line (up to the first line break) will be used as table comment (it can even be empty) and the rest is for the model only. But that'll take a bit time until it is available.
Mike
Mike Lischke, MySQL Developer Tools
Oracle Corporation
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