@zgyivi First off, welcome to the Rockstor community forum and thanks for reporting your findings.
I’m pretty sure this is related to a similar report we received yesterday so linking to that report from this thread:
“Null value in column “pqgroup_eusage” violates not-null constraintDETAIL: Failing row contains (6, 4, 0/259, data1, null, 4831838208, root, root, 755, 2017-02-14 17:12:34.201143 00, data1, f, no, 0, 0, 2015/4, null, null)”
It could be that this is related to some recent share size calculation changes and I believe the intrepid @Flyer is gathering ‘angles’, hence my link.
Thanks again for your detailed report.