There are no triggers on the table.

The table has records periodically imported into it, every 5 minutes. Records were created as follows:

integrationQueueID, Created

7002 - 7018, 11:20am

7019 -7023, 11:25am

7024 - 7029, 11:30am

7030 - 7032, 11:35am

On the 11:40 attempt the sequence somehow had been reset to 7002 and the duplicate primary key error occurred.

The import had worked for days and then suddenly the sequence reset to something that had been generated 4 iteration earlier.