Avoid multiple notifications to the same alert
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Suggestion
Considering that user has the following alerts saved: 3.65, 3.70. Dollert should notify when dollar reaches 3.65. On the next request, Dollert should not notify the user if the dollar value continues the same. So, in this case, the user only will get notified again if dollar reaches 3.70. This exact same behaviour will be applied to 3.70.
In cases where user has just one alert, the way suggested above will make user never being notified after the first notification. So, a good addition to those requisites would be silent the last notified alert during 30 minutes. Then, if that same alert (that only one alert the user saved) is reached after 31 minutes from first notification, user is notified about that same USD value again.