Andrea Maria Piana b27779aa4e
Add Mailserver Request Gaps service (#1596)
This commits add some endpoints to store mailserver request gaps,
and provides 4 endpoints:

```
AddMailserverRequestGaps(gaps []MailserverRequestGap) error
GetMailserverRequestGaps(chatID string) []MailserverRequestGap
DeleteMailserverRequestGaps(ids []string) error
DeleteMailserverRequestGapsByChatID(id string) error
```
2019-09-04 12:04:17 +02:00
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