Clean up codebase: remove dead code, fix SQL injection, simplify complex methods

[Copilot]

Removed tech debt across Python, C#, and JavaScript codebases.

Security Fixes

• SQL Injection Vulnerabilities (python/sql.py)
  • Replaced string concatenation with parameterized queries in search_user() and add_user()
  • Fixed missing parentheses in add_user() connection instantiation

# Before
query = "SELECT * FROM users WHERE username = '" + username + "'"
cursor.execute(query)

# After  
query = "SELECT * FROM users WHERE username = %s"
cursor.execute(query, (username,))

Code Simplification

• TaskItem.CalculateTaskScore (DotnetApp/Models/TaskItem.cs)
  • Extracted CalculateHighPriorityScore() and CalculateMediumPriorityScore() methods
  • Replaced nested if-else chains with early returns and switch expressions
  • Reduced cognitive complexity: 110 lines → 66 lines

Dead Code Removal

• Deleted 3 empty files: python/point.py, terraform/iac.tf, python/tests/test_calculator.py
• Removed unused imports from DotnetApp/Program.cs (System.IO, Microsoft.Extensions.FileProviders)

JavaScript Quality

• list-utils.js: Fixed linting violations (unused vars, var→const/let, shadowing, ==→===)
• math-utils.js: Removed module-level side effects (console.log on import)

Net: -53 lines, 2 security fixes, 0 new test failures

Original prompt

Can you clean up this codebase for me?

Custom agent used: Janitor
Perform janitorial tasks on any codebase including cleanup, simplification, and tech debt remediation.

---

✨ Let Copilot coding agent set things up for you — coding agent works faster and does higher quality work when set up for your repo.

[sonarqubecloud]

Quality Gate failed

Failed conditions
E Security Rating on New Code (required ≥ A)

See analysis details on SonarQube Cloud

Catch issues before they fail your Quality Gate with our IDE extension SonarQube for IDE