The old database is created by 2.3.6. And recreate the database by doctor is useless. But the other version such as 2.3.7 works fine. So we believe 2.3.7_08 has a bug.
A few entities loss after update to 2.3.7_08!
#1
codefad
#2
support
More details are required in order to understand the problem.
ObjectDB Support