Fix cannot get foreign keys with same names

[huyleminh01]

Summary

• Short summary of the task, what have been done etc
• Please include screenshots whenever possible (important).

Issue

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Lasting Changes (Technical)

(please list down: code changes/things that have wide-effect; new libraries/functions added that can be used by others; examples below)

• (Added class EmailValidator to validate email address' validity)
• (Added Tenant#is_trial? check)

Checklist

Please check directly on the box once each of these are done

• [ ] Documentation (if necessary)
• [ ] Tests (integration test/unit test)
• [ ] Integration Tests Passed
• [ ] Code Review