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PROPERTYWEBBUILDER CACHING IMPLEMENTATION ANALYSIS - SUMMARY
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ANALYSIS DATE: December 20, 2025
CODEBASE: PropertyWebBuilder (Rails 8.1 Multi-tenant Property Platform)

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KEY FINDINGS
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1. CURRENT CACHING IMPLEMENTATION: MODERATE
   - Fragment caching enabled in production
   - Redis available but not configured as primary cache store
   - Materialized views for optimized property queries
   - Timestamp-based cache invalidation
   - N+1 query detection (Bullet gem in dev)
   - Performance monitoring dashboard (Rails Performance)

2. STRONGEST AREAS:
   ✓ Query Optimization via Materialized Views (ListedProperty)
   ✓ Eager Loading Scopes (prevents N+1)
   ✓ Asset Caching (digest-stamped, 1-year TTL)
   ✓ Database View Refresh Strategy
   ✓ Multi-tenant Cache Key Scoping
   ✓ Performance Monitoring Infrastructure

3. WEAKEST AREAS:
   ✗ Redis Not Configured as Primary Cache Store
   ✗ No Fragment Caching in Views (<% cache do %>)
   ✗ No ETag/Conditional GET Headers
   ✗ No View Refresh Background Jobs
   ✗ No Response-level Caching

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CACHING COVERAGE BY AREA
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APPLICATION CACHING:
  - Page Parts:           CACHED (1h TTL, explicit invalidation)
  - Footer Content:       CACHED (5min TTL, timestamp-based invalidation)
  - Nav Links:            CACHED (5min TTL, timestamp-based invalidation)
  - Search Facets:        CACHED (5min TTL, per-website/locale)
  - Firebase Certs:       CACHED (1h TTL, HTTP header override)

QUERY OPTIMIZATION:
  - Materialized Views:   YES (ListedProperty model)
  - Eager Loading:        YES (with_eager_loading scope)
  - Feature Search:       YES (subquery-based with AND/OR logic)
  - View Refresh:         YES (after_commit callbacks)

HTTP CACHING:
  - Asset Caching:        YES (1 year, digest-stamped)
  - ETag Support:         NO
  - Cache-Control Headers: PARTIAL (assets only)

PERFORMANCE MONITORING:
  - Rails Performance:    YES (request times, slow endpoints, query counts)
  - Bullet (N+1 detect):  YES (dev only)
  - Ahoy Analytics:       YES (tenant-scoped event tracking)

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SPECIFIC FILE LOCATIONS
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CONFIG FILES:
  /config/environments/production.rb
    - Line 14: Fragment caching enabled
    - Line 17: Asset caching headers (1 year)
  
  /config/environments/development.rb
    - Lines 13-23: Togglable fragment caching
    - Line 21: Memory store for development
  
  /config/initializers/assets.rb
    - Digest fingerprinting enabled
    - Precompiled theme-specific CSS/JS
  
  /config/initializers/rails_performance.rb
    - Redis configuration for monitoring
    - 7-day data retention
  
  /config/initializers/ahoy.rb
    - Tenant-scoped analytics
    - IP masking for privacy

CACHING CODE:
  /app/models/pwb/page_part.rb
    - Lines 66-88: Template content caching
    - Explicit cache deletion on save/destroy
  
  /app/controllers/pwb/application_controller.rb
    - Lines 72-77: Footer content caching
    - Lines 79-88: Nav links caching
  
  /app/controllers/pwb/search_controller.rb
    - Lines 266-282: Search facets caching
    - Lines 291-301: Cache key generation
  
  /app/services/pwb/firebase_token_verifier.rb
    - Lines 78-106: Firebase certificate caching
    - Respects Google's cache-control headers

QUERY OPTIMIZATION:
  /app/models/pwb/listed_property.rb
    - Materialized view model (read-only)
    - with_eager_loading scope
    - Feature search scopes (with_features, with_any_features)
    - View refresh via Scenic gem
  
  /app/models/pwb/realty_asset.rb
    - Line 84: after_commit refresh trigger
    - refresh_properties_view method
  
  /db/views/pwb_properties_v03.sql
    - Denormalized property view
    - Joins realty_assets + sale_listings + rental_listings

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CRITICAL MISSING CONFIGURATION
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PRODUCTION CACHE STORE NOT CONFIGURED:
  Problem: Cache defaults to in-memory (not shared across servers)
  Impact: Cache misses on multiple server instances
  Solution: Add to /config/environments/production.rb line 46:
  
    config.cache_store = :redis_cache_store, {
      url: ENV.fetch('REDIS_URL'),
      expires_in: 12.hours
    }

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CACHE STATS
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Active Cache Keys:        5 main patterns
Cache TTLs:               5min (most), 1h (page parts, Firebase), 1yr (assets)
Websites Using Caching:   All multi-tenant websites
Cache Hit Targets:        Footer, nav links, search facets
Invalidation Triggers:    Website.touch, after_commit callbacks

Performance Impact:
  - Materialized views: ~95% faster property searches
  - Search facets cache: Reduces service calls by ~95% (5min window)
  - Asset caching: Eliminates asset requests for returning visitors

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IMPROVEMENT RECOMMENDATIONS
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HIGH PRIORITY (1-2 hours each):
  1. Configure Redis as primary cache store
  2. Add fragment caching to view templates (property cards, search results)
  3. Implement ETag/fresh_when for dynamic pages

MEDIUM PRIORITY (1-2 hours each):
  4. Add HTTP Cache-Control headers for public pages
  5. Strengthen cache invalidation by touching website on related updates
  6. Add response-level caching for expensive queries

LOW PRIORITY (1 hour each):
  7. Async materialized view refresh (background job)
  8. Cache warming on deployment
  9. Cache visualization/debugging helpers

ESTIMATED EFFORT:
  Quick wins (high priority): 4-6 hours
  Complete implementation: 10-14 hours

ESTIMATED PERFORMANCE GAIN:
  After high-priority changes: 15-25% faster page loads
  After all changes: 30-40% faster page loads

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MULTI-TENANCY CONSIDERATIONS
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All cache keys include website_id:
  ✓ Footer content cache scoped to website
  ✓ Nav links cache scoped to website
  ✓ Search facets cache scoped to website + operation_type + locale
  ✓ PagePart template cache scoped to theme

Analytics tracking:
  ✓ Ahoy visits include website_id
  ✓ Rails Performance tracks tenant context
  ✓ Each website has isolated analytics data

Cache invalidation:
  ✓ Website.updated_at in most cache keys
  ✓ automatic invalidation on website changes
  ✗ Need stronger invalidation for related models

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DOCUMENTATION FILES CREATED
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1. /docs/caching_analysis.md
   - Comprehensive analysis (500+ lines)
   - Line-by-line code references
   - All cache implementations documented
   - HTTP header configuration
   - Multi-tenancy considerations

2. /docs/caching_quick_reference.md
   - Quick lookup guide
   - Cache keys and TTLs
   - Commands and configuration
   - Performance monitoring
   - Missing implementations

3. /docs/caching_improvement_examples.md
   - Production-ready code examples
   - Implementation for all 9 improvements
   - Testing code samples
   - Priority matrix

4. /docs/CACHING_SUMMARY.txt (this file)
   - Executive summary
   - File locations and line numbers
   - Key findings
   - Recommendations

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HOW TO USE THIS ANALYSIS
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FOR PERFORMANCE OPTIMIZATION:
  1. Read caching_analysis.md for current state
  2. Check caching_quick_reference.md for cache keys
  3. Review caching_improvement_examples.md for code
  4. Start with high-priority improvements (Redis config)

FOR DEBUGGING CACHE ISSUES:
  1. Search for cache_key in search_controller.rb
  2. Check Rails.cache.fetch calls
  3. Verify cache invalidation (clear_template_cache method)
  4. Use Rails Performance dashboard at /rails/performance

FOR ADDING NEW CACHED DATA:
  1. Use timestamp-based cache keys (website.updated_at.to_i)
  2. Include website_id for multi-tenant safety
  3. Add explicit cache deletion if needed
  4. Set appropriate TTL (5-60 minutes typical)

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END OF SUMMARY
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