For SLE 15 SP4 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/devel:openQA:SLE-15/SLE_15_SP4/devel:openQA:SLE-15.repo
zypper refresh
zypper install perl-DBIx-Class-OptimisticLocking
For SLE 15 SP3 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/devel:openQA:SLE-15/SLE_15_SP3/devel:openQA:SLE-15.repo
zypper refresh
zypper install perl-DBIx-Class-OptimisticLocking
For SLE 15 SP2 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/devel:openQA:SLE-15/SLE_15_SP2/devel:openQA:SLE-15.repo
zypper refresh
zypper install perl-DBIx-Class-OptimisticLocking