Extension:PropertySuggester/wbs propertypairs table

mysql> describe wbs_propertypairs; +-+-+--+-+-++ +-+-+--+-+-++ +-+-+--+-+-++
 * Field      | Type                | Null | Key | Default | Extra          |
 * row_id     | bigint(20) unsigned | NO   | PRI | NULL    | auto_increment |
 * pid1       | int(10) unsigned    | NO   | MUL | NULL    |                |
 * qid1       | int(10) unsigned    | YES  |     | NULL    |                |
 * pid2       | int(10) unsigned    | NO   |     | NULL    |                |
 * count      | int(10) unsigned    | NO   |     | NULL    |                |
 * probability | float              | NO   |     | NULL    |                |
 * context    | varbinary(32)       | NO   |     | NULL    |                |