chore: refactor code structure for improved readability and maintenability

[erickarugu]

Description

Type of Change

• 🚀 New feature (non-breaking change which adds functionality)
• 🐛 Bug fix (non-breaking change which fixes an issue)
• 💥 Breaking change (fix or feature that would cause existing functionality to not work as expected)
• 📝 Documentation update
• 🔧 Chore (maintenance, dependencies, refactoring)
• ⚡ Performance improvement
• 🧪 Test coverage

Related Issue

Closes #

Changes Made

Testing

• Unit tests added/updated
• E2E tests added/updated
• Manual testing performed
• All existing tests pass

Test Instructions

Database Changes

• Migration files included
• Schema changes documented
• Backwards compatible
• N/A - No database changes

API Changes

• New endpoints added
• Existing endpoints modified
• Breaking API changes
• Swagger documentation updated
• N/A - No API changes

Security Considerations

• Input validation implemented
• Authentication/Authorization checks added
• Sensitive data properly handled
• No security concerns
• N/A

Checklist

• Code follows project style guidelines (ESLint/Prettier)
• Self-review of code completed
• Code is well-commented where necessary
• No console.log statements
• Changes generate no new warnings/errors
• Tests added/updated and passing
• Documentation updated (if needed)
• Branch naming follows convention (type/description)

Screenshots/Videos

Additional Notes

Deployment Notes

• Environment variables updated in .env.example
• No deployment concerns
• Special deployment steps required (describe below)

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Reviewer Notes:

[Copilot]

Pull request overview

This PR refactors the codebase to improve readability and maintainability (note: PR title has a typo - "maintenability" should be "maintainability"). The changes add infrastructure for production readiness including health checks, metrics monitoring, error handling, and improved build processes.

Key Changes:

• Added health check infrastructure with database and optional Redis monitoring using @nestjs/terminus
• Integrated Prometheus metrics collection via @willsoto/nestjs-prometheus
• Implemented global HTTP exception filter for standardized error responses
• Enhanced Docker configuration with OCI labels and health checks
• Added migration management scripts and lint-staged pre-commit hooks

Reviewed changes

Copilot reviewed 13 out of 14 changed files in this pull request and generated 12 comments.

Show a summary per file

File	Description
package.json	Added new dependencies (terminus, prometheus, ioredis, rimraf, lint-staged), migration scripts, lint-staged configuration, and prebuild script
pnpm-lock.yaml	Updated lockfile with new dependencies and their transitive dependencies
libs/shared/src/http/http-exception.filter.ts	New global exception filter for standardizing error responses across the application
libs/shared/src/index.ts	Export new HTTP exception filter
libs/shared/src/config/index.ts	Added optional REDIS_URL environment variable to schema
libs/core/src/prometheus/prometheus.module.ts	New module configuring Prometheus metrics with default metrics enabled at /metrics endpoint
libs/core/src/index.ts	Export new Prometheus module
libs/core/src/core.module.ts	Import and register Prometheus module
apps/anchorpay/src/main.ts	Added global exception filter, enabled URI-based versioning, and imported versioning types
apps/anchorpay/src/health/redis-health.indicator.ts	New health indicator for Redis connectivity checks
apps/anchorpay/src/health/health.module.ts	Added TerminusModule and RedisHealthIndicator provider
apps/anchorpay/src/health/health.controller.ts	Refactored to use @nestjs/terminus for database and conditional Redis health checks
Dockerfile	Added OCI metadata labels and health check configuration
.husky/pre-commit	Added shebang and lint-staged execution

Files not reviewed (1)

• pnpm-lock.yaml: Language not supported

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[Copilot]

Pull request overview

Copilot reviewed 16 out of 17 changed files in this pull request and generated 7 comments.

Files not reviewed (1)

• pnpm-lock.yaml: Language not supported

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[Copilot]

Pull request overview

Copilot reviewed 16 out of 17 changed files in this pull request and generated 9 comments.

Files not reviewed (1)

• pnpm-lock.yaml: Language not supported

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[Copilot]

@erickarugu I've opened a new pull request, #6, to work on those changes. Once the pull request is ready, I'll request review from you.