nerves-project / property_table / 37c85533-4492-43e5-a1b2-2710b972efa8

93%

main: 94%

Pull #95

circleci

Set event previous timestamps as best as possible

Previously when events were sent on a property for the first time, the
`previous_timestamp` was `nil`. This was a typespec violation, but it
also made it hard to know how long the property was in the unknown
state. Depending on the use, an application could infer a default value
on the property. It could also assign an "unknown" value. Either way, it
could be useful to know how long it was in this state and `nil` didn't
help.

A side effect of this change is that all values set explicitly or
implicitly at startup will have the same timestamp. This could come in
handy.

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