Extend notification property values column length

[mikron]

There are situations when the email notification property values are longer than varchar 255, would be nice to have this values extended to the 32k or even biger.

[mikron]

This are the comments from documentation of RDBMses
PostgreSQL - In any case, the longest possible character string that can be stored is about 1 GB
MySQL - 65,535
So I would suggest to update 65,534

[dnavre]

This are the comments from documentation of RDBMses
PostgreSQL - In any case, the longest possible character string that can be stored is about 1 GB
MySQL - 65,535
So I would suggest to update 65,534

What if we use different limitations on different databases? The only tricky thing is that when exceeding the limit we'll have to detect the error and raise the correct exception.