feat: create database schema and backend validation for impact

[suzy-g38]

Related Issue

Closes #333

create database schema for backend and also add backend validation schema for impact

Description

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Checklist

• [x] My code adheres to the established style guidelines of the project.
• [x] I have included comments in areas that may be difficult to understand.
• [x] My changes have not introduced any new warnings.
• [x] I have conducted a self-review of my code.

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