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REDIS_CACHE_INDEX.md

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Redis Cache Migration - Complete Documentation Index

Project: Multi-Category VideoMedia Support
Created: December 10, 2025
Status: Ready for Implementation

📚 Documentation Overview

Five comprehensive documents have been created to guide the Redis cache migration:

1. REDIS_CACHE_SUMMARY.md (Executive Summary)

  • Purpose: High-level overview for decision makers and team leads
  • Length: ~300 lines
  • Contains:
    • Executive summary of changes
    • Key facts and figures
    • Implementation timeline
    • Risk assessment
    • FAQ section
    • Success criteria
  • Best For: Getting a quick understanding of the full scope

2. REDIS_CACHE_QUICK_REF.md (Quick Reference Checklist)

  • Purpose: Quick lookup during development
  • Length: ~200 lines
  • Contains:
    • Redis keys requiring changes (organized by type)
    • New Redis keys to add (5 essential + optional)
    • Memory impact summary
    • Cache invalidation strategy
    • Implementation checklist (4 phases)
    • TTL recommendations
    • File list to update
  • Best For: Quick reference during coding, checklists during implementation

3. REDIS_CACHE_MIGRATION.md (Complete Technical Analysis)

  • Purpose: Comprehensive technical deep-dive
  • Length: ~600 lines
  • Contains 8 Sections:
    1. Overview of changes
    2. Redis keys requiring changes (detailed)
    3. New Redis keys to add (detailed)
    4. Cache invalidation strategy (comprehensive)
    5. Memory estimation (with calculations)
    6. Recommended new keys checklist
    7. TTL recommendations
    8. Implementation priority (3 phases)
    9. Sample cache builder code
    10. Summary table
    11. Timeline & effort estimation
  • Best For: Deep technical understanding, architecture decisions

4. REDIS_CACHE_IMPLEMENTATION.md (Step-by-Step Guide)

  • Purpose: Production-ready implementation guide
  • Length: ~700 lines
  • Contains:
    • Phase 1-5 with step-by-step instructions
    • Complete code examples for each builder:
    • TagCacheBuilder (updated)
    • CategoryCacheBuilder (updated)
    • ChannelCacheBuilder (updated)
    • VideoCategoryIndexBuilder (new)
    • VideoCategoriesLookupBuilder (new)
    • CategoryVideoCountBuilder (new)
    • CacheSyncService integration
    • Invalidation logic implementation
    • Testing checklist
    • Deployment checklist
  • Best For: Actual implementation, copy-paste ready code

5. REDIS_CACHE_VISUAL_GUIDE.md (Architecture Diagrams)

  • Purpose: Visual representation of architecture changes
  • Length: ~400 lines
  • Contains:
    • ASCII diagrams of current vs new architecture
    • Key changes matrix
    • Cache key relationships (before/after)
    • Memory layout visualizations
    • Query pattern evolution (before/after)
    • Builder execution order diagram
    • Invalidation flow diagrams
    • TTL lifecycle visualization
    • Implementation timeline diagram
  • Best For: Understanding relationships, presenting to team

🗂️ How to Use This Documentation

For Project Leads

  1. Start with REDIS_CACHE_SUMMARY.md

    • Understand scope, timeline, risks
    • Review success criteria
    • Make Go/No-Go decision

  2. Refer to REDIS_CACHE_QUICK_REF.md

    • Overview of checklist
    • Resource estimation

For Architects

  1. Read REDIS_CACHE_MIGRATION.md (complete analysis)
  2. Review REDIS_CACHE_VISUAL_GUIDE.md (architecture)
  3. Reference REDIS_CACHE_IMPLEMENTATION.md (for detail)

For Developers

  1. Start with REDIS_CACHE_VISUAL_GUIDE.md (understand structure)
  2. Follow REDIS_CACHE_IMPLEMENTATION.md (step-by-step)
  3. Use REDIS_CACHE_QUICK_REF.md (daily reference)
  4. Reference REDIS_CACHE_MIGRATION.md (when questions arise)

For DevOps/SRE

  1. Review REDIS_CACHE_MIGRATION.md (memory section)
  2. Check REDIS_CACHE_IMPLEMENTATION.md (deployment section)
  3. Monitor metrics listed in REDIS_CACHE_SUMMARY.md

📊 Quick Facts at a Glance

Database Changes (Already Completed ✅)

Channel.prisma:   ADD categories, tags, tagNames (JSON)
Category.prisma:  REMOVE channelId; ADD tags (JSON), tagNames
VideoMedia.prisma: CHANGE categoryId → categoryIds
Tag.prisma:       REMOVE channelId

Redis Keys Changes

Type Action Keys Affected Count
Change Update payload app:video:detail, app:category:all, app:tag:all 3
Add New indexes 5 new patterns 5
Change Remove field Tag/Category builders 2

Memory Impact

  • Current: 45 MB
  • After: 80 MB
  • Increase: +35 MB (acceptable)

Timeline

  • Phase 1: 2-3 days (DB migrations)
  • Phase 2: 2-3 days (builder updates)
  • Phase 3: 1-2 days (new builders)
  • Phase 4: 1 day (integration)
  • Phase 5: 2-3 days (testing & deploy)
  • Total: 8-12 days

Team & Risk

  • Team Size: 1-2 backend engineers
  • Risk Level: Medium
  • Critical Success Factor: Thorough testing with 58K videos

🎯 Key Implementation Steps

Phase 1: Database Schema ✅ (DONE)

  • Update Channel.prisma
  • Update Category.prisma
  • Update VideoMedia.prisma
  • Update Tag.prisma
  • Create migration
  • Run migration

Phase 2: Cache Builders 🔄 (NEXT)

  • Update TagCacheBuilder (code provided)
  • Update CategoryCacheBuilder (code provided)
  • Update ChannelCacheBuilder (code provided)
  • Update VideoMedia builder
  • Test with full dataset

Phase 3: Index Builders 🆕 (NEW)

  • Create VideoCategoryIndexBuilder (code provided)
  • Create VideoCategoriesLookupBuilder (code provided)
  • Create CategoryVideoCountBuilder (code provided)
  • Integrate with CacheSyncService

Phase 4: Production Ready 🚀

  • Invalidation logic
  • TTL management
  • Monitoring & alerts
  • Deployment plan

📋 New Redis Keys Summary

Essential (Mandatory)

  1. app:video:category:index:{categoryId}:videos (ZSET)

    • Multi-category video listing
    • Memory: +12.2 MB
    • TTL: 2 hours

  2. app:video:categories:{videoId} (SET)

    • Video→categories lookup
    • Memory: +7.5 MB
    • TTL: 24 hours

  3. app:category:video:count:{categoryId} (STRING)

    • Count for UI display
    • Memory: +80 KB
    • TTL: 1 hour

Optional (Performance)

  1. app:tag:search:{prefix} (SET)

    • Tag autocomplete
    • Memory: +0.5-1 MB
    • TTL: 2 hours

  2. app:category:tagnames:flat:{categoryId} (STRING)

    • Flat tag names for search
    • Memory: +400 KB
    • TTL: 24 hours

✅ Validation Checklist

Before Starting

  • Read REDIS_CACHE_SUMMARY.md
  • Review REDIS_CACHE_VISUAL_GUIDE.md
  • Understand Phase 1-5 in REDIS_CACHE_IMPLEMENTATION.md
  • Ensure Redis headroom: 100+ MB available

During Implementation

  • Follow REDIS_CACHE_IMPLEMENTATION.md step-by-step
  • Reference REDIS_CACHE_QUICK_REF.md for checklists
  • Use code from REDIS_CACHE_IMPLEMENTATION.md
  • Test each phase before proceeding

Before Production

  • Load test with 58K+ videos
  • Verify memory usage < 80 MB
  • Check cache hit rates > 90%
  • Validate response times < 100ms
  • Test invalidation logic thoroughly

🔍 Documentation Cross-References

Finding Information

"How do I implement the builders?" → REDIS_CACHE_IMPLEMENTATION.md, Phase 2-3

"What memory will this use?" → REDIS_CACHE_MIGRATION.md, Part 4

"What are the new Redis keys?" → REDIS_CACHE_QUICK_REF.md, "NEW Redis Keys to Add"

"How does invalidation work?" → REDIS_CACHE_MIGRATION.md, Part 3 → REDIS_CACHE_IMPLEMENTATION.md, Phase 5

"What's the timeline?" → REDIS_CACHE_SUMMARY.md, Implementation Timeline

"Show me the architecture" → REDIS_CACHE_VISUAL_GUIDE.md, all sections

"Where are the code examples?" → REDIS_CACHE_IMPLEMENTATION.md, Phase 2-3

"What should I test?" → REDIS_CACHE_IMPLEMENTATION.md, Phase 6

"How do I deploy?" → REDIS_CACHE_IMPLEMENTATION.md, Deployment Checklist

📑 File Locations

All files are in the repository root:

box-nestjs-monorepo/
├── REDIS_CACHE_SUMMARY.md                 (Start here)
├── REDIS_CACHE_QUICK_REF.md               (Quick lookup)
├── REDIS_CACHE_MIGRATION.md               (Deep analysis)
├── REDIS_CACHE_IMPLEMENTATION.md          (Step-by-step)
├── REDIS_CACHE_VISUAL_GUIDE.md            (Diagrams)
└── REDIS_CACHE_INDEX.md                   (This file)

🚀 Quick Start (5 Minutes)

  1. Read: REDIS_CACHE_SUMMARY.md (10 min)
  2. Skim: REDIS_CACHE_VISUAL_GUIDE.md (5 min)
  3. Decision: Go/No-Go based on timeline and resources
  4. Start: Follow Phase 1 in REDIS_CACHE_IMPLEMENTATION.md

📞 Questions & Answers

Q: Which document should I read first?

A: REDIS_CACHE_SUMMARY.md for overview, then REDIS_CACHE_VISUAL_GUIDE.md for understanding

Q: Where are the code examples?

A: REDIS_CACHE_IMPLEMENTATION.md has complete production-ready code for all builders

Q: Can I copy-paste the code?

A: Yes, all code in REDIS_CACHE_IMPLEMENTATION.md is copy-paste ready

Q: How much time will this take?

A: 8-12 days for full implementation (see REDIS_CACHE_SUMMARY.md)

Q: What's the risk level?

A: Medium (well-mitigated with comprehensive guides provided)

Q: Do I need to update application code?

A: Yes, code using categoryId must change to categoryIds (array)

Q: Can I rollback if issues occur?

A: Yes, rollback plan is documented in REDIS_CACHE_SUMMARY.md

🎓 Learning Path

Beginner:
  1. REDIS_CACHE_SUMMARY.md (overview)
  2. REDIS_CACHE_VISUAL_GUIDE.md (architecture)
  3. REDIS_CACHE_QUICK_REF.md (quick facts)

Intermediate:
  4. REDIS_CACHE_MIGRATION.md (technical detail)
  5. REDIS_CACHE_QUICK_REF.md (checklists)

Advanced:
  6. REDIS_CACHE_IMPLEMENTATION.md (code)
  7. Deep code review and testing

✨ Key Highlights

What's Great About This Migration

✅ Multi-category support enables flexible content organization
✅ Denormalization improves query performance
✅ New indexes support efficient multi-category queries
✅ Backward compatible migration path
✅ Comprehensive documentation provided

What Requires Attention

⚠️ Memory increases by 66% (plan accordingly)
⚠️ All cache builders need updates
⚠️ Thorough testing critical with 58K videos
⚠️ Application code needs updates
⚠️ Invalidation logic must be precise

📞 Support Resources

In This Documentation

  • ✅ Complete analysis and reasoning
  • ✅ Step-by-step implementation guide
  • ✅ Production-ready code examples
  • ✅ Testing and deployment checklists
  • ✅ Architecture diagrams
  • ✅ Quick reference guides

External Resources

🎯 Success Metrics

Track these after deployment:

  1. Cache Hit Rate (target: >90%)
  2. Memory Usage (target: <80 MB)
  3. Query Response Time (target: <100ms)
  4. Index Freshness (target: <2 hours old)
  5. Zero Errors in application logs

📝 Notes

  • Prisma schema files already updated ✅
  • This documentation is comprehensive and ready to use
  • No external dependencies beyond what's already in the project
  • Timeline is realistic with proper team coordination
  • Risk is manageable with thorough testing

START HERE: Read REDIS_CACHE_SUMMARY.md first

THEN: Review REDIS_CACHE_VISUAL_GUIDE.md for architecture understanding

FINALLY: Follow REDIS_CACHE_IMPLEMENTATION.md for step-by-step implementation

Total Documentation: ~2000+ lines
Code Examples Provided: 6 complete builders
Ready to Implement: Yes ✅