* **max_processes_backend** - Maximum number of concurrent database processes for background tasks. Default value is 5.
* **max_processes_frontend** - Maximum number of concurrent database processes for foreground tasks. Default value is 20.
* **min_poll_interval** - minimal distance in minutes between two polls for a contact. Default is 1. Reasonable values are between 1 and 59.
* **max_processes_backend** - Maximum number of concurrent database processes for background tasks. Default value is 5.
* **max_processes_frontend** - Maximum number of concurrent database processes for foreground tasks. Default value is 20.
* **min_poll_interval** - minimal distance in minutes between two polls for a contact. Default is 1. Reasonable values are between 1 and 59.