fix concurrent TimeClock issue

[bseber]

fixes #765 (related #755)

Here are some things you should have thought about:

Multi-Tenancy

• [ ] Extended new entities with AbstractTenantAwareEntity?
• [ ] New entity added to TenantAwareDatabaseConfiguration?
• [ ] Tested with dev-multitenant profile?

refs #755

[sonarcloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

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