Part of the md_docs_storage_propertyinfo storage system.

Fields:

pi_property_id - Numeric representation of the Pid. P64 -> 64.
- Can be joined against page.page_title if the namespace for Properties is known.
pi_type - The data type of the property.
- This is repeated from the content of pi_info to allow properties to be queried by type efficiently.
pi_info - A JSON BLOB containing information associated with the property.

+----------------+------------------+------+-----+---------+-------+
| Field          | Type             | Null | Key | Default | Extra |
+----------------+------------------+------+-----+---------+-------+
| pi_property_id | int(10) unsigned | NO   | PRI | NULL    |       |
| pi_type        | varbinary(32)    | NO   | MUL | NULL    |       |
| pi_info        | blob             | NO   |     | NULL    |       |
+----------------+------------------+------+-----+---------+-------+

Extra Indexes:

pi_type - Allowing queries by Property type (Eg. string, url etc.)

Example data:

pi_property_id	pi_type	pi_info
18	commonsMedia	{"type":"commonsMedia","formatterURL":"https:\/\/commons.wikimedia.org\/wiki\/File:$1"}
20	wikibase-item	{"type":"wikibase-item"}
353	external-id	{"type":"external-id","formatterURL":"https:\/\/www.genenames.org\/tools\/search\/#!\/all?query=$1"}