feat(sequelize): introduce front validation mechanism and enhance current agent validation

[Thenkei]

Definition of Done

General

• [ ] Write an explicit title for the Pull Request, following Conventional Commits specification
• [ ] Test manually the implemented changes
• [ ] Validate the code quality (indentation, syntax, style, simplicity, readability)

Security

• [ ] Consider the security impact of the changes made

[codeclimate[bot]]

Code Climate has analyzed commit d37110bf and detected 0 issues on this pull request.

The test coverage on the diff in this pull request is 96.8% (98% is the threshold).

This pull request will bring the total coverage in the repository to 97.5%.

View more on Code Climate.

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:tada: This PR is included in version 1.11.3 :tada:

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:tada: This PR is included in version 1.8.39 :tada:

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:tada: This PR is included in version 1.3.25 :tada:

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:tada: This PR is included in version 1.9.0 :tada:

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:tada: This PR is included in version 1.14.13 :tada:

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:tada: This PR is included in version 1.3.14 :tada:

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