Debugging Code Contamination: How Legacy Features Sneak Into New Projects

Had one of those satisfying debugging sessions today where everything just clicks into place.

I've been working on cleaning up some template contamination across three new verticals I'm building - electricians, dentists, and IV hydration services. The issue? Code artifacts from an old photo booth project had somehow made their way into these completely unrelated templates.

Turns out all three verticals had the exact same contamination pattern across 5 files each. Classic copy-paste inheritance gone wrong. The photo booth code was littered throughout:

• bpPackageDetails references that should have been ivServiceDetails
• Random $city_event_vibe declarations that made zero sense for medical services
• Broken event references and inline render blocks
• Misnamed section IDs and onclick handlers

What I love about this kind of work is the detective aspect. Once I spotted the pattern in the first vertical, I knew exactly what to look for in the others. Same 5 files, same contamination points, same fixes needed.

The cleanup was methodical:

• Renamed all the photo booth package details to proper service details
• Stripped out the event vibe stuff completely (4 locations in the city template alone)
• Fixed all the broken event references
• Gave each vertical its own namespace (el= for electricians, dt= for dentists, iv= for IV hydration)

All three verticals are now clean and ready for deployment whenever I provision the infrastructure. There's something deeply satisfying about taking messy, contaminated code and making it pristine again.

Next up is either spinning up the Cloudways infrastructure or pushing these fixes live to the Workers deployment. The foundation is solid now - time to build on it.