Calculating remaining_hours after plugin migration failure.

[dlcron]

Migration finished with no errors.

0.9.26 -> 1.0.6 (redmine backlogs)
2.0.0 -> 2.3.2 (redmine)

After redmine_backlogs migration the data migrated for purposes of burdawn charts differ. I tried to find solution on my own, getting through RbIssueHistory migration function, but no success. I am sure it's migration fault, because new table was added to store information like remaining hours, and the values there differ.

Can you help me? Screens example:

Hope it's enough info.
Marcin