Unreasonable use of CPU/memory by postgres / owtf processes

@7a : OWTF and its main process as well as the postgres process misuse CPU and memory, even when workers are idle as illustrated in the screenshot below:
![owtf](https://cloud.githubusercontent.com/assets/4557897/7428605/13a83554-f011-11e4-8705-4f0fc26f3994.png)
