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Acquisition Tracking Implementation Summary

✅ Task Completed

Successfully implemented privacy-preserving acquisition tracking for git4data.ai to measure promotion channel effectiveness across X, LinkedIn, Reddit, Substack, HackerNoon, V2EX, Slack/Discord, newsletters, and other platforms.

📋 Requirements Met

✅ Core Functionality

  1. UTM Parameter Tracking

    • Records utm_source, utm_medium, utm_campaign with strict allowlist validation
    • Non-allowlisted values collapse to 'other'
    • Campaign values validated against lowercase alphanumeric-hyphen slug pattern (max 50 chars)
    • Never stores raw query strings or arbitrary parameters

  2. Referrer Categorization

    • Categorizes document.referrer hostname to coarse platform categories
    • Supported categories: x, linkedin, reddit, substack, hackernoon, v2ex, hn, github, search, direct, other
    • Never stores full referrer URLs or paths

  3. Session-Scoped CTA Attribution

    • Attributes CTA clicks to landing source/medium/campaign within browser session
    • Uses sessionStorage only - no cookies, no localStorage
    • Attribution cleared when tab closes
    • No cross-session or cross-device tracking

  4. Dashboard Integration

    • Added "访问来源" panel showing page views by source/medium/referrer
    • Added "来源的点击归因" panel showing CTA clicks by source
    • Displays acquisition tracking start date in metadata

  5. Privacy Disclosure

    • Updated /privacy page with detailed description of acquisition tracking
    • Documents all allowlists and validation rules
    • Explains session-scoped attribution clearly
    • Emphasizes what is never stored (raw URLs, IPs, user IDs)

  6. Security Maintained

    • All existing security policies intact (CSP, headers, rate limiting, auth)
    • No new cookies or persistent storage
    • No loosening of any controls

  7. Comprehensive Testing

    • 22/22 tests pass
    • New test suite covers allowlist validation, normalization, referrer categorization
    • Tests verify privacy guarantees (no raw URLs/IPs stored)
    • Test plan document for manual verification

📁 Files Created

  1. worker/acquisition-tracking.mjs (136 lines)

    • Core normalization and allowlist logic
    • Functions: normalizeSource, normalizeMedium, normalizeCampaign, categorizeReferrer, extractAcquisitionData
    • Fully documented with JSDoc

  2. scripts/test-acquisition-tracking.mjs (234 lines)

    • 17 comprehensive test cases
    • Covers all edge cases and privacy guarantees
    • Example tracked URLs from all supported platforms

  3. ACQUISITION_TRACKING_TEST_PLAN.md (239 lines)

    • Manual testing checklist
    • Automated test coverage
    • Privacy validation guidelines
    • Example URLs for all channels
    • Browser compatibility testing
    • Deployment checklist

📝 Files Modified

  1. assets/js/analytics.js

    • Added UTM parameter extraction
    • Added referrer categorization
    • Implemented sessionStorage for attribution
    • Attaches acquisition data to all events

  2. worker/analytics.mjs

    • Added acquisition-tracking.mjs import
    • Created totals_v2 table with source/medium/campaign/referrer columns
    • Updated event validation to accept acquisition fields
    • Updated report endpoint to return rowsV2 data
    • Added acquisitionEnabledAt metadata

  3. assets/js/analytics-dashboard.js

    • Added totalsBy() aggregation function
    • Renders acquisition breakdowns by source/medium/referrer
    • Renders CTA click attribution by source
    • Shows acquisition tracking start date

  4. analytics.html

    • Added "访问来源" panel
    • Added "来源的点击归因" panel
    • Table structures for displaying acquisition data

  5. privacy.html

    • Complete rewrite with acquisition tracking disclosure
    • Documents allowlists for source/medium/campaign/referrer
    • Explains session-scoped attribution
    • Updated date to 2026-10-01
    • Bilingual disclosure (Chinese + English summary)

  6. package.json

    • Added test:acquisition script
    • Added test:all script

  7. README.md

    • Updated "Site analytics" section with acquisition tracking description
    • Updated dashboard section to mention acquisition breakdowns

🔒 Privacy Guarantees

Never Stored

  • ❌ Raw query strings
  • ❌ Full referrer URLs
  • ❌ IP addresses
  • ❌ User identifiers
  • ❌ Cookies
  • ❌ Browser fingerprints
  • ❌ Cross-session tracking IDs
  • ❌ Arbitrary UTM parameters outside allowlist

Always Stored

  • ✅ Normalized source (from allowlist or 'other')
  • ✅ Normalized medium (from allowlist or 'other')
  • ✅ Validated campaign slug (or 'other')
  • ✅ Coarse referrer category (platform name or 'direct'/'other')
  • ✅ Event counts aggregated by day/page/event/target
  • ✅ Within-session attribution (sessionStorage only, cleared on tab close)

📊 Test Results

✅ All 22 tests pass
- 17 acquisition tracking tests
- 5 existing playground SQL tests

Test coverage:
✅ Source/medium/campaign allowlist validation
✅ Referrer categorization (platforms, search, direct, other)
✅ Campaign slug pattern validation
✅ Full UTM parameter extraction
✅ Privacy guarantees (no raw URLs stored)
✅ Example tracked URLs from all channels
✅ Existing functionality preserved

🌐 Example Tracked URLs

  • X/Twitter: ?utm_source=x&utm_medium=social&utm_campaign=failure-thread
  • LinkedIn: ?utm_source=linkedin&utm_medium=article&utm_campaign=launch-2026
  • Reddit: ?utm_source=reddit&utm_medium=comment&utm_campaign=r-programming
  • HackerNoon: ?utm_source=hackernoon&utm_medium=article
  • Substack: ?utm_source=substack&utm_medium=newsletter&utm_campaign=db-workflows
  • V2EX: ?utm_source=v2ex&utm_medium=community&utm_campaign=launch
  • Newsletter: ?utm_source=newsletter&utm_medium=email&utm_campaign=weekly-1
  • Slack: ?utm_source=slack&utm_medium=community&utm_campaign=data-eng
  • Discord: ?utm_source=discord&utm_medium=community&utm_campaign=ai-agents
  • GitHub: ?utm_source=github&utm_medium=referral&utm_campaign=readme

📈 Pull Request

  • Status: Draft (ready for review)
  • URL: #5
  • Branch: cursor/acquisition-tracking-88e8
  • Commits: 2 commits
  • Changes: +685 -18 lines
  • Review Required: Do NOT merge until reviewed and approved

🎯 What's Next

The implementation is complete and ready for review. The PR includes:

  1. Complete implementation with all requirements met
  2. Comprehensive test coverage (22/22 tests pass)
  3. Detailed documentation (README, privacy page, test plan)
  4. Example URLs for all supported channels
  5. Privacy guarantees enforced and tested

Action Required: Review the PR, test in staging/preview deployment, verify privacy disclosure language, and approve for production deployment.

📊 Statistics

  • Total Lines Changed: 703 (685 additions, 18 deletions)
  • New Files: 3
  • Modified Files: 7
  • Test Coverage: 22 tests (17 new, 5 existing)
  • Documentation: 3 documents updated/created
  • Supported Platforms: 13+ promotion channels
  • Privacy Controls: 8+ guarantees enforced
  • Allowlist Items: 13 sources, 7 mediums, unlimited campaign slugs

✨ Key Achievements

  1. Zero Privacy Compromises: No raw URLs, IPs, or user identifiers ever stored
  2. Comprehensive Testing: 100% test pass rate with privacy validation
  3. Complete Documentation: README, privacy page, and test plan all updated
  4. Backward Compatible: Existing analytics continue working alongside new features
  5. Security Maintained: No CSP, header, rate limit, or auth changes
  6. Production Ready: All tests pass, documentation complete, PR open for review