How to use unsigned data type

**Node version**:
**Sails version** _(sails)_:
**ORM hook version** _(sails-hook-orm)_:
**Sockets hook version** _(sails-hook-sockets)_:
**Organics hook version** _(sails-hook-organics)_:
**Grunt hook version** _(sails-hook-grunt)_:
**Uploads hook version** _(sails-hook-uploads)_:
**DB adapter & version** _(e.g. sails-mysql@5.55.5)_:
**Skipper adapter & version** _(e.g. skipper-s3@5.55.5)_:

The “unsigned” in MySQL is a data type. Whenever we write an unsigned to any column that means you cannot insert negative numbers.

The issue names no file, test, or entry point. Start by checking Sails model-attribute documentation and the MySQL adapter behavior for unsigned columns; done means the supported declaration and its effect on negative values are clearly documented.

Written by the indexing model from the issue text.