Mirror sync interval specified as duration string (#1407)
* Sync interval specifed as duration string
* Changed mirror interval text
* make fmt
* Add MinInterval for mirror sync
* Use duration internally
* Changed min default to 10m
* make fmt
* Incorrect default
* Removed defaults in MustDuration()
* Add Mirror interval migration
* Default values corrected
* Use transaction during migration
* Change http 500 to page with error message
* Cleanup session.commit()
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