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The report stored with a name 'UserSettings_configuration' in the blob archive tables, is not truncated and can take up significant space in the DB.
It should be truncated after 500 rows.
Fixed in 
I noticed the issue looking at monthly archives: where name='UserSettings_configuration', the blob was up to 31K in size, when the second most larger was the 'Page URLs' report Actions_actions_url at 20K