Manual:Site identifiers table

The site_identifiers table contains ... DOCUMENT ME!.

si_site
...

si_type
...

si_key
...

Schema summary
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 * Field  | Type             | Null | Key | Default | Extra |
 * si_site | int(10) unsigned | NO  | MUL | NULL    |       |
 * si_type | varchar(32)     | NO   | PRI | NULL    |       |
 * si_key | varchar(32)      | NO   | PRI | NULL    |       |