feat: update proposal's value

[wa0x6e]

Enhanced Proposal Value Calculation System

This PR refines the proposal value tracking system by implementing standardized precision and centralized
calculation logic for proposal USD values.

Key Features

🎯 Core Enhancement

• Update scores_total_value column precision from DECIMAL(64,30) to DECIMAL(13,3) for optimized storage and performance (feat: set vote fiat value #566)
• Implement centralized proposal value calculation logic in dedicated helper functions for improved maintainability

🔧 Technical Implementation

• Centralized Logic: Consolidated value calculation in src/helpers/entityValue.ts creating a single source of truth for all value operations
• Helper Functions: New dedicated functions for proposal value computation improving code organization and reusability (will be useful later, when introducing batch refresh of all proposals)

Database Changes

• Modified scores_total_value column from DECIMAL(64,30) to DECIMAL(13,3) optimizing storage while maintaining appropriate precision for USD values

Testing

Update the db with

  ALTER TABLE proposals MODIFY COLUMN scores_total_value DECIMAL(13,3) NOT NULL DEFAULT 0.000;

• create a proposal with erc-20 strategies
• vote
• when proposal close, it should update the scores_total_value column, with the voter's total voting power x strategy value

[Copilot]

Pull Request Overview

This PR updates proposal value calculation functionality by implementing a new system to calculate and store the USD value of a proposal's total voting power. The change reduces database precision from 30 to 3 decimal places for better USD representation and adds comprehensive value calculation logic.

Key changes:

• Implements getProposalValue function to calculate proposal USD values based on voting power and strategy values
• Updates database schema to use DECIMAL(13,3) precision for scores_total_value column
• Integrates value calculation into the proposal scoring workflow

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 3 comments.

File	Description
src/helpers/entityValue.ts	New helper function to calculate proposal values with validation and error handling
src/scores.ts	Integration of value calculation into proposal update workflow
test/schema.sql	Database schema update to reduce decimal precision from (64,30) to (13,3)
test/unit/helpers/entityValue.test.ts	Comprehensive test coverage for the new value calculation function