Add taxonomy creation to db loader

[galshubeli]

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Project	Deployment	Preview	Comments	Updated (UTC)
queryweaver	Ready	Preview	Comment	Aug 24, 2025 6:36pm

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[Copilot]

Pull Request Overview

This PR adds taxonomy creation functionality to database loaders by implementing distinct value extraction capabilities. The purpose is to enhance database schema understanding by automatically collecting and storing distinct values from columns that meet specific criteria (low uniqueness and manageable count).

Key changes:

• Implements distinct value extraction logic in base loader with database-specific implementations
• Adds configuration parameters for controlling distinct value collection thresholds
• Updates taxonomy agent to accept explanation parameter for better clarification generation

Reviewed Changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
api/loaders/base_loader.py	Adds abstract methods and core logic for extracting distinct values from database columns
api/loaders/postgres_loader.py	Implements PostgreSQL-specific distinct value extraction methods and integrates with column info extraction
api/loaders/mysql_loader.py	Implements MySQL-specific distinct value extraction methods and integrates with column info extraction
api/config.py	Adds configuration parameters for distinct value collection thresholds
api/agents/taxonomy_agent.py	Updates taxonomy agent to accept explanation parameter for enhanced clarification
tests/test_postgres_loader.py	Updates test mock to handle multiple database queries for distinct value extraction

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