bugfix: check if user exists before create a new refresh token

[Cristhianzl]

This pull request introduces a new validation step before creating a new refresh token. Additionally, improvements have been made to the interceptor functionality.

Changes:

• User Existence Check:

Added a check to verify if the user exists in the database before generating a new refresh token. This ensures that tokens are only created for valid users.

• Interceptor Improvements:

Applied several enhancements to the interceptor to improve its performance and reliability.

[github-actions[bot]]

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_{Last Modified at 30 Jul 24 15:57 UTC}

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