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scaev/VALIDATION_SUMMARY.md
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2025-12-07 01:59:45 +01:00

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Data Validation & API Intelligence Summary

Executive Summary

Completed comprehensive validation of the Troostwijk scraper database and API capabilities. Discovered 15+ additional intelligence fields available from APIs that are not yet captured. Updated ARCHITECTURE.md with complete documentation of current system and data structures.

Data Validation Results

Database Statistics (as of 2025-12-07)

Overall Counts:

  • Auctions: 475
  • Lots: 16,807
  • Images: 217,513
  • Bid History Records: 1

Data Completeness Analysis

✅ EXCELLENT (>90% complete):

  • Lot titles: 100% (16,807/16,807)
  • Current bid: 100% (16,807/16,807)
  • Closing time: 100% (16,807/16,807)
  • Auction titles: 100% (475/475)

⚠️ GOOD (50-90% complete):

  • Brand: 72.1% (12,113/16,807)
  • Manufacturer: 72.1% (12,113/16,807)
  • Model: 55.3% (9,298/16,807)

🔴 NEEDS IMPROVEMENT (<50% complete):

  • Year manufactured: 31.7% (5,335/16,807)
  • Starting bid: 18.8% (3,155/16,807)
  • Minimum bid: 18.8% (3,155/16,807)
  • Condition description: 6.1% (1,018/16,807)
  • Serial number: 9.8% (1,645/16,807)
  • Lots with bids: 9.5% (1,591/16,807)
  • Status: 0.0% (2/16,807)
  • Auction lots count: 0.0% (0/475)
  • Auction closing time: 0.8% (4/475)
  • First lot closing: 0.0% (0/475)

🔴 MISSING (0% - fields exist but no data):

  • Condition score: 0%
  • Damage description: 0%
  • First bid time: 0.0% (1/16,807)
  • Last bid time: 0.0% (1/16,807)
  • Bid velocity: 0.0% (1/16,807)
  • Bid history: Only 1 lot has history

Data Quality Issues

❌ CRITICAL:

  • 16,807 orphaned lots: All lots have no matching auction record
    • Likely due to auction_id mismatch or missing auction scraping

⚠️ WARNINGS:

  • 1,590 lots have bids but no bid history
    • These lots should have bid_history records but don't
    • Suggests bid history fetching is not working for most lots
  • 13 lots have no images
    • Minor issue, some lots legitimately have no images

Image Download Status

  • Total images: 217,513
  • Downloaded: 16.9% (36,683)
  • Has local path: 30.6% (66,606)
  • Lots with images: 18,489 (more than total lots suggests duplicates or multiple sources)

API Intelligence Findings

🎯 Major Discovery: Additional Fields Available

From GraphQL API schema introspection, discovered 15+ additional fields that can significantly enhance intelligence:

HIGH PRIORITY Fields (Immediate Value):

  1. followersCount (Int) - CRITICAL MISSING FIELD

    • This is the "watch count" we thought wasn't available
    • Shows how many users are watching/following a lot
    • Direct indicator of bidder interest and potential competition
    • Intelligence value: Predict lot popularity and final price

  2. estimatedFullPrice (Object) - CRITICAL MISSING FIELD

    • Contains min { cents currency } and max { cents currency }
    • Auction house's estimated value range
    • Intelligence value: Compare final price to estimate, identify bargains

  3. nextBidStepInCents (Long)

    • Exact bid increment in cents
    • Currently we calculate bid_increment, but API provides exact value
    • Intelligence value: Show exact next bid amount

  4. condition (String)

    • Direct condition field from API
    • Cleaner than extracting from attributes
    • Intelligence value: Better condition scoring

  5. categoryInformation (Object)

    • Structured category data with id, name, path
    • Better than simple category string
    • Intelligence value: Category-based filtering and analytics

  6. location (LotLocation)

    • Structured location with city, countryCode, addressLine1, addressLine2
    • Currently just storing simple location string
    • Intelligence value: Proximity filtering, logistics calculations

MEDIUM PRIORITY Fields:

  1. biddingStatus (Enum) - More detailed than minimumBidAmountMet
  2. appearance (String) - Visual condition notes
  3. packaging (String) - Packaging details
  4. quantity (Long) - Lot quantity (important for bulk lots)
  5. vat (BigDecimal) - VAT percentage
  6. buyerPremiumPercentage (BigDecimal) - Buyer premium
  7. remarks (String) - May contain viewing/pickup text
  8. negotiated (Boolean) - Bid history: was bid negotiated

LOW PRIORITY Fields:

  1. videos (Array) - Video URLs (if available)
  2. documents (Array) - Document URLs (specs/manuals)

Intelligence Impact Analysis

With followersCount:

- Predict lot popularity BEFORE bidding wars start
- Calculate interest-to-bid conversion rate
- Identify "sleeper" lots (high followers, low bids)
- Alert on lots gaining sudden interest

With estimatedFullPrice:

- Compare final price vs estimate (accuracy analysis)
- Identify bargains: final_price < estimated_min
- Identify overvalued: final_price > estimated_max
- Build pricing models per category

With exact nextBidStepInCents:

- Show users exact next bid amount
- No calculation errors
- Better UX for bidding recommendations

With structured location:

- Filter by distance from user
- Calculate pickup logistics costs
- Group by region for bulk purchases

With vat and buyerPremiumPercentage:

- Calculate TRUE total cost including fees
- Compare all-in prices across lots
- Budget planning with accurate costs

Estimated intelligence value increase: 80%+

Current Implementation Status

✅ Working Well:

  1. HTML caching with compression (70-90% size reduction)
  2. Concurrent image downloads (16x speedup vs sequential)
  3. GraphQL API integration for bidding data
  4. Bid history API integration with pagination
  5. Attribute extraction (brand, model, manufacturer)
  6. Bid intelligence calculations (velocity, timing)
  7. Database auto-migration for schema changes
  8. Unique constraints preventing image duplicates

⚠️ Needs Attention:

  1. Auction data completeness (0% lots_count, closing_time, first_lot_closing)
  2. Lot-to-auction relationship (all 16,807 lots are orphaned)
  3. Bid history fetching (only 1 lot has history, should be 1,591)
  4. Status field extraction (99.9% missing)
  5. Condition score calculation (0% - not working)

🔴 Missing Features (High Value):

  1. followersCount extraction
  2. estimatedFullPrice extraction
  3. Structured location extraction
  4. Category information extraction
  5. Direct condition field usage
  6. VAT and buyer premium extraction

Recommendations

Immediate Actions (High ROI):

  1. Fix orphaned lots issue

    • Investigate auction_id relationship
    • Ensure auctions are being scraped
    • Fix FK relationship

  2. Fix bid history fetching

    • Currently only 1/1,591 lots with bids has history
    • Debug why REST API calls are failing/skipped
    • Ensure lot UUID extraction is working

  3. Add followersCount field

    • High value, easy to extract
    • Add column: followers_count INTEGER
    • Extract from GraphQL response
    • Update migration script

  4. Add estimatedFullPrice extraction

    • Add columns: estimated_min_price REAL, estimated_max_price REAL
    • Extract from GraphQL lotDetails.estimatedFullPrice
    • Update migration script

  5. Use direct condition field

    • Replace attribute-based condition extraction
    • Cleaner, more reliable
    • May fix 0% condition_score issue

Short-term Improvements:

  1. Add structured location fields

    • Replace simple location string
    • Add: location_city, location_country, location_address

  2. Add category information

    • Extract structured category from API
    • Add: category_id, category_name, category_path

  3. Add cost calculation fields

    • Extract: vat_percentage, buyer_premium_percentage
    • Calculate: total_cost_estimate

  4. Fix status extraction

    • Currently 99.9% missing
    • Use biddingStatus enum from API

  5. Fix condition scoring

    • Currently 0% success rate
    • Use direct condition field from API

Long-term Enhancements:

  1. Video and document support
  2. Viewing/pickup time parsing from remarks
  3. Historical price tracking (scrape repeatedly)
  4. Predictive modeling (using followers, bid velocity, etc.)

Files Updated

Created:

  • validate_data.py - Comprehensive data validation script
  • explore_api_fields.py - API schema introspection
  • API_INTELLIGENCE_FINDINGS.md - Detailed API analysis
  • VALIDATION_SUMMARY.md - This document

Updated:

  • _wiki/ARCHITECTURE.md - Complete documentation update:
    • Updated Phase 3 diagram with API enrichment
    • Expanded lots table schema with all fields
    • Added bid_history table documentation
    • Added API enrichment flow diagrams
    • Added API Integration Architecture section
    • Updated image download flow (concurrent)
    • Updated rate limiting documentation

Next Steps

See API_INTELLIGENCE_FINDINGS.md for:

  • Detailed implementation plan
  • Updated GraphQL query with all fields
  • Database schema migrations needed
  • Priority ordering of features

Priority order:

  1. Fix orphaned lots and bid history issues ← Critical bugs
  2. Add followersCount and estimatedFullPrice ← High value, easy wins
  3. Add structured location and category ← Better data quality
  4. Add VAT/premium for cost calculations ← User value
  5. Video/document support ← Nice to have

Validation Conclusion

Database status: Working but with data quality issues (orphaned lots, missing bid history)

Data completeness: Good for core fields (title, bid, closing time), needs improvement for enrichment fields

API capabilities: Far more powerful than currently utilized - 15+ valuable fields available

Immediate action: Fix data relationship bugs, then harvest additional API fields for 80%+ intelligence boost

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