Joseph Tingiris 6285caba52 Hide devices added for devices that existed before #11104 (#11107)
* Migrate devices.inserted to allow null values and set existng row values to null

* Hide Device Added for devices that existed before https://github.com/librenms/librenms/pull/11104

* Don't display any date that stats with a zero

* make schema match migration
2020-02-06 05:44:04 -06:00
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