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The general idea is to assume that all nodes are not working, except if they reported as working in the last 16 minutes.
Also I suggest to change on daemon app interval for sending uptime to 15 min, like it is for balance and block.
Then if no record is inserted into the DB in the last 15 min, then the new SQL query is triggered because of the 16 min mark,
isWorking: false
is inserted into the DB and at the cronjob time mark a notification mail is going to be sent.