[WIP] Identify and suggest improvements for inefficient code

[Copilot]

Performance Optimization Plan

Issues Identified and Fixes

• Fix inefficient string comparisons in repositories

  • CourseRepository: Use EF.Functions.Like for case-insensitive searches
  • StudentRepository: Use EF.Functions.Like for case-insensitive searches

• Optimize N+1 query pattern in CertificateService

  • Add eager loading with Include() for related entities
  • Refactor MapToDto to avoid repeated lookups

• Add AsNoTracking for read-only queries

  • Add to all repository read methods that don't need change tracking

• Fix in-memory pagination issues

  • CourseService: Apply filters at database level before pagination
  • RegistrationService: Apply filters at database level before pagination

• Remove redundant controller queries

  • CoursesController: Eliminate double query in GetCourseRegistrations

• Simplify AdminAccessChecker

  • Remove redundant validation methods
  • Consolidate duplicate logic

• Run tests and validate changes

  • Build the solution
  • Run existing tests
  • Verify no regressions

Original prompt

Identify and suggest improvements to slow or inefficient code

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