Create repetitive thread to retry to persist UsageRecords
|Status:||Closed||Start date:||Nov 12, 2015|
|Priority:||Normal||Due date:||Nov 30, 2015|
|Assignee:||Luca Frosini||% Done:|
|Sprint:||zz - Accounting finishing touch|
accounting-lib need some mechanism to retry to store records which where persisted on fallback (on file).