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Delayed 15-minute data

When reading the DB at 10:00Z (right after scanning), the following records get extracted into both sgv-*.json files:

[
{"device":"LibreLink-DB-hist","rssi":99,"date":1590483686000,"dateString":"2020-05-26T09:01:26.0Z","type":"sgv","sgv":116.0},
{"device":"LibreLink-DB-hist","rssi":99,"date":1590484559000,"dateString":"2020-05-26T09:15:59.0Z","type":"sgv","sgv":113.0},
{"device":"LibreLink-DB-hist","rssi":99,"date":1590485465000,"dateString":"2020-05-26T09:31:05.0Z","type":"sgv","sgv":111.0}
]

[
{"device":"LibreLink-DB-real","rssi":99,"date":1590483795000,"dateString":"2020-05-26T09:03:15.0Z","type":"sgv","sgv":117.0},
{"device":"LibreLink-DB-real","rssi":99,"date":1590485006000,"dateString":"2020-05-26T09:23:26.0Z","type":"sgv","sgv":114.0},
{"device":"LibreLink-DB-real","rssi":99,"date":1590485191000,"dateString":"2020-05-26T09:26:31.0Z","type":"sgv","sgv":114.0},
{"device":"LibreLink-DB-real","rssi":99,"date":1590485879000,"dateString":"2020-05-26T09:37:59.0Z","type":"sgv","sgv":107.0},
{"device":"LibreLink-DB-real","rssi":99,"date":1590486079000,"dateString":"2020-05-26T09:41:19.0Z","type":"sgv","sgv":107.0},
{"device":"LibreLink-DB-real","rssi":99,"date":1590487145000,"dateString":"2020-05-26T09:59:05.0Z","type":"sgv","sgv":115.0}
]

The current code uses the latest uploaded sgv value. After uploading the above data, this will skip the 15-minute record that's expected for ~09:46 but hasn't been provided yet.

Since much attention has been paid not to upload records twice, a possible compatible workaround would be to drop all "real" (scanned) records that are newer than the latest "hist" record.

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