Introduced table jsonCache for persisten caching of JSON data

DESC jsonCache;
+-----------------+------------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+-----------------+------------------+------+-----+---------+-------+
| cid | int(10) unsigned | NO | PRI | NULL | |
| user | int(10) unsigned | NO | PRI | NULL | |
| id | varchar(128) | NO | PRI | NULL | |
| json | mediumtext | NO | | NULL | |
| inProgress | tinyint(4) | YES | | 0 | |
| inProgressSince | bigint(64) | YES | | NULL | |
| lastUpdate | bigint(64) | YES | | NULL | |
| took | bigint(64) | YES | | 0 | |
| size | bigint(64) | YES | | 0 | |
+-----------------+------------------+------+-----+---------+-------+