Fix Lint Errors

[Naseem77]

Too Many Local Variables
Too Many Argument
Too Many Statements
Raise Missing From
Invalid Name
Unused Variable

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[Copilot]

Pull Request Overview

This PR addresses multiple lint errors throughout the codebase by implementing code quality improvements. The changes focus on reducing complexity, improving exception handling, and following Python best practices.

Key changes:

• Refactored large functions into smaller, more manageable helper functions
• Added custom exception classes for better error handling specificity
• Fixed broad exception catching with appropriate pylint disable comments

Reviewed Changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
api/loaders/postgres_loader.py	Added custom exception classes, improved exception handling with proper chaining
api/loaders/mysql_loader.py	Added custom exception classes, simplified exception handling logic
api/loaders/init.py	Added module docstring
api/graph.py	Added pylint disable comment for broad exception handling
api/auth/user_management.py	Major refactoring to break down complex function into smaller helpers, improved validation
api/agents/analysis_agent.py	Refactored schema formatting into smaller, focused methods