Maximum size of ContentProperties stored with a page

The docs say that 32kb of ContentProperty can be stored with each piece of content.
Is this the total amount per key value pair or the total amount of all key value pairs stored with a page (which I may not know, because different plugins or macros may store some own data). I just want to make sure that I don‘t run out of storage space when my custom macro stores data with a page.

I have the same problem. If I try to publish a page with a ContentProperty of 300 characters, I get:

PSQLException: ERROR: value too long for type character varying(255)

And sure enough, the column in the database is only VARCHAR 255 (I have Confluence 6.9.0-beta1).

            Table "public.contentproperties"
    Column    |            Type             | Modifiers 
 propertyid   | bigint                      | not null
 propertyname | character varying(255)      | not null
 stringval    | character varying(255)      | 
 longval      | bigint                      | 
 dateval      | timestamp without time zone | 
 contentid    | bigint                      | 

So, indeed, does Confluence really allow 32kb of Content Properties ?

The documentation for confluence server does not specify the size of the contentproperties. These are meant for small amounts of data, not for storing blobs.

If you have a large amount of data, please consider using Active Objects