Harbor database Corruption state

[gmadu123]

I tried to upgrade from 1.5.2 to 1.7.4 bosh harbor deployment. It failed and i try to restore back to old version. now i see it got back to fresh install without data. I see db_backup folder in side /data folder. Need to know how to recover data first so that we can be healthy on 1.5.2 and then need help to upgrade to latest version(1.7.4)

drwxr-xr-x 2 10000 10000 4096 Aug 23 2018 ca_download
-rw------- 1 10000 10000 16 Aug 23 2018 secretkey
-rw------- 1 10000 10000 8 Aug 23 2018 defaultalias
drwxr-xr-x 2 999 root 4096 Aug 23 2018 redis
drwxr-xr-x 2 10000 10000 4096 Aug 23 2018 config
drwxr-xr-x 2 10000 10000 4096 Aug 23 2018 psc
drwxr-xr-x 3 10000 10000 4096 Aug 23 2018 registry
drwxr-xr-x 2 root root 4096 Apr 19 01:57 cert
-rw-r--r-- 1 root root 6 Apr 22 17:23 harbor_version
drwxr-xr-x 2 10000 10000 77824 Apr 22 17:29 job_logs
drwx------ 19 999 admin 4096 Apr 22 17:40 clair-db
drwxr-xr-x 6 10000 10000 4096 Apr 22 17:40 notary-db
drwx------ 22 10000 10000 4096 Apr 22 17:40 database
drwxr-xr-x 2 root root 4096 Apr 22 17:59 db_backup