Expected Behavior

If the clock lands 1 days before Extended Maintenance, specifically at 11:00 am ET / 12:00 am jst:

• is1DaybeforeExtendedMaintenance will set to true.
• Tweet will be posted because extendedMaintenancePostedFlags.posted24HourWarning is false.
• extendedMaintenancePostedFlags.posted24HourWarning will be set to true.

If the app crashes, the tweet should not post again and should wait for the next checkpoint, extendedMaintenancePostedFlags.posted2HourWarning

Actual Behavior

If the app crashes & reboots, assuming the 1 day warning has been posted already:

• is1DaybeforeExtendedMaintenance will be re-initialized to false.
• Tweet will attempt to post again
• Twitter returns a "duplicate status" rejected attempt, closing connection to the API. This causes extended downtime on the bot.
• App crashes, repeats cycle

Steps to reproduce bug

1. Allow a warning tweet to be posted, e.g. 11AM ET for the 2 hour warning
2. End the Express instance
3. Set clock to 10:58AM ET and restart the Express instance
4. Take note of Twitter's "duplicate status" rejected attempt

example crash logs from a 1 day warning double post

2022-10-17T02:06:31.246937+00:00 app[worker.1]:     'x-response-time': '102',
2022-10-17T02:06:31.246937+00:00 app[worker.1]:     'x-connection-hash': '2a0792015ff665fb2086d0ae79c31bfb53bbd67f7dac7ec7c89181fa28ec373e',
2022-10-17T02:06:31.246937+00:00 app[worker.1]:     connection: 'close'
2022-10-17T02:06:31.246938+00:00 app[worker.1]:   },
2022-10-17T02:06:31.246938+00:00 app[worker.1]:   rateLimit: undefined,
2022-10-17T02:06:31.246938+00:00 app[worker.1]:   data: { errors: [ { code: 187, message: 'Status is a duplicate.' } ] },
2022-10-17T02:06:31.246938+00:00 app[worker.1]:   errors: [ { code: 187, message: 'Status is a duplicate.' } ]
2022-10-17T02:06:31.246939+00:00 app[worker.1]: }
2022-10-17T02:06:31.403329+00:00 heroku[worker.1]: Process exited with status 1
2022-10-17T02:06:31.503170+00:00 heroku[worker.1]: State changed from up to crashed

Specs

Version: Express 4.18.2
Platform: Heroku

Suggestions

Write and load the extendedMaintenancePostedFlags to/from an external file so that state is preserved
AND OR
Guard the postTweet function with an additional condition; one that checks that it is no more than a minute past the time. For example,

const is2HoursBeforeExtendedMaintenance = isTodayExtendedMaintenance && extendedMaintenanceDay.getUTCHours() === 0 && currentDate.getMinutes() < 1;