Clear out old job logs

[ShaneMcC]

We should clear out old job logs that we no longer care about rather than retaining them forever.

These use up a significant amount of space for no reason.

mysql> SELECT       table_schema as `Database`,       table_name AS `Table`,       round(((data_length + index_length) / 1024 / 1024), 2) `Size in MB`  FROM information_schema.TABLES  WHERE `table_schema` = 'dnsapi' ORDER BY (data_length + index_length) DESC;
+----------+----------------------+------------+
| Database | Table                | Size in MB |
+----------+----------------------+------------+
| dnsapi   | joblogs              |    2467.67 |
| dnsapi   | jobs                 |      63.58 |
| dnsapi   | records              |       1.70 |
| dnsapi   | zonekeys             |       1.53 |
| dnsapi   | domains              |       0.09 |
| dnsapi   | userdomaincustomdata |       0.08 |
| dnsapi   | twofactordevices     |       0.08 |
| dnsapi   | apikeys              |       0.05 |
| dnsapi   | usercustomdata       |       0.05 |
| dnsapi   | domainkeys           |       0.05 |
| dnsapi   | twofactorkeys        |       0.05 |
| dnsapi   | users                |       0.03 |
| dnsapi   | job_depends          |       0.03 |
| dnsapi   | domainhooks          |       0.03 |
| dnsapi   | domain_access        |       0.03 |
| dnsapi   | permissions          |       0.02 |
| dnsapi   | __MetaData           |       0.02 |
| dnsapi   | blockregexes         |       0.02 |
| dnsapi   | articles             |       0.02 |
+----------+----------------------+------------+
19 rows in set (0.05 sec)

mysql>