unique index on TextField
MySQL is very strange!
 I think this should probably be rolled into a larger issue to refactor the DDL generation code.
 Closing in favor of 261.

MySQL requires a maximum number of characters that will be relevant for an unique index on longtext fields, whilst the actual field may and will be much larger. Seems this is not possible to define in pw while creating a new table. I am not aware of the same issue in supported rdbms, but is there a possibility to add this now already, or in a future release? 
