fix: Using current time in UTC as default in Postgresql

[weichou1229]

Using current time in UTC as default in Postgresql for created and modified time.

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• I am not introducing a breaking change (if you are, flag in conventional commit message with BREAKING CHANGE: describing the break)
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Testing Instructions

Test with core service and support scheduler.

New Dependency Instructions (If applicable)

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

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

See analysis details on SonarQube Cloud

[cloudxxx8]

LGTM