MyClub/DOCS/NEWSLETTER_IMPLEMENTATION_SUMMARY.md

Newsletter Implementation Summary

✅ Implementation Complete

The comprehensive newsletter system has been fully implemented with all requested features.

🎯 Features Implemented

1. Enhanced Subscription Flow

• ✅ Initial email with token for preference setup
• ✅ Welcome email with unsubscribe/manage links
• ✅ Token-based preference management (no login required)
• ✅ Unsubscribe functionality in every email

2. Four Newsletter Types

Týdenní Přehled (Weekly Overview)

• ✅ Sends every Sunday at 9 AM (configurable day/hour in admin)
• ✅ Contains blogs, activities, matches, scores
• ✅ Filtered by user preferences and categories

Nadcházející Zápasy (Upcoming Matches)

• ✅ Sends 2 days before match (configurable lead time)
• ✅ Sends day-of reminder (0-6 hours before)
• ✅ Includes: category, teams, place, time, date
• ✅ Filtered by user-selected categories

Nový Blog (Blog Notifications)

• ✅ Sends immediately when blog is published
• ✅ Includes title, excerpt, tracked link to article
• ✅ Filtered by blog categories
• ✅ Auto-triggered from admin when publishing

Výsledky Zápasu (Match Results)

• ✅ Sends after match finishes (within 6 hours)
• ✅ Includes final score and match details
• ✅ Respects quiet hours (default 22:00-08:00)
• ✅ Filtered by categories

3. Email Analytics & Tracking

• ✅ Open tracking (transparent pixel)
• ✅ Click tracking (all links wrapped)
• ✅ Blog links with tracking parameters
• ✅ Unsubscribe tracking
• ✅ All events logged in email_event table

4. Admin Configuration

• ✅ Master on/off toggle
• ✅ Individual newsletter type toggles
• ✅ Weekly schedule configuration (day + hour)
• ✅ Match reminder lead time setting
• ✅ Quiet hours for result notifications
• ✅ Manual test sending
• ✅ Manual digest sending
• ✅ Newsletter preview
• ✅ Subscriber management

5. Category-Based Filtering

• ✅ Users can specify categories in preferences
• ✅ Comma-separated list (e.g., "MFS A, MFS B, Divize")
• ✅ Applied to matches, results, and blogs
• ✅ Empty = receive all categories

📁 Files Created/Modified

New Files

1. database/migrations/20250930000001_enhance_newsletter_system.up.sql - Migration for tracking tables
2. database/migrations/20250930000001_enhance_newsletter_system.down.sql - Rollback migration
3. internal/services/newsletter_automation.go - Main automation service (550+ lines)
4. NEWSLETTER_SYSTEM.md - Comprehensive documentation
5. NEWSLETTER_IMPLEMENTATION_SUMMARY.md - This file

Modified Files

1. internal/models/email.go - Added tracking models (NewsletterSentLog, MatchNotification, BlogNotification)
2. internal/controllers/base_controller.go - Added blog notification trigger
3. internal/routes/routes.go - Added newsletter automation instance management
4. main.go - Initialize and start newsletter automation
5. internal/models/models.go - Settings table already had newsletter fields

Existing Files Leveraged

1. internal/models/contact.go - NewsletterSubscription model with preferences JSONB
2. internal/controllers/contact_controller.go - Subscription endpoints, preference management
3. internal/services/newsletter_content.go - Content builder for digests
4. internal/services/newsletter_scheduler.go - Legacy weekly scheduler (kept for compatibility)
5. pkg/email/service.go - Email sending with analytics tracking
6. pkg/utils/subscriber_token.go - Token generation/validation
7. templates/emails/newsletter_welcome.html - Welcome template
8. templates/emails/newsletter.html - General newsletter template

🗄️ Database Changes

New Tables (3)

newsletter_sent_log          -- Tracks all sent newsletters
match_notifications          -- Prevents duplicate match alerts
blog_notifications           -- Prevents duplicate blog alerts

Modified Tables

None - all required fields already existed in:

• newsletter_subscriptions (preferences JSONB)
• settings (newsletter configuration fields)
• email_log & email_event (analytics)

🔧 Configuration

Required Settings in Database (settings table)

newsletter_enabled = true                -- Master toggle
enable_weekly = true                     -- Enable weekly digest
enable_match_reminders = true            -- Enable match alerts
enable_results = true                    -- Enable result notifications
newsletter_weekly_day = 'sun'            -- Day for weekly (sun/mon/tue/wed/thu/fri/sat)
newsletter_weekly_hour = 9               -- Hour for weekly (0-23)
newsletter_reminder_lead_hours = 48      -- Hours before match for first alert
newsletter_quiet_start = 22              -- Don't send results between these hours
newsletter_quiet_end = 8                 -- (22:00 - 08:00)

Environment Variables (Optional)

NEWSLETTER_ENABLED=true                  # Can be overridden by DB setting
NEWSLETTER_INTERVAL_HOURS=24             # Legacy setting for old scheduler

🚀 How to Use

1. Run Migration

export RUN_MIGRATIONS=true
./main

2. Enable in Admin

curl -X PATCH http://localhost:8080/api/v1/admin/newsletter/enable \
  -H "Authorization: Bearer YOUR_ADMIN_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{"enabled": true}'

3. Configure Settings

Update the settings table via admin API or directly in database.

4. Test

curl -X POST http://localhost:8080/api/v1/admin/newsletter/test \
  -H "Authorization: Bearer YOUR_ADMIN_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{"email": "test@example.com", "type": "weekly"}'

🔄 Automation Schedule

The system runs checks every 15 minutes and:

1. Checks if it's time for weekly digest (matches configured day/hour)
2. Scans upcoming matches for reminder opportunities
3. Scans finished matches for result notifications
4. Blog notifications trigger immediately on publish (not on schedule)

⚠️ Important Notes

Duplicate Prevention

• Each notification type has tracking to prevent duplicates
• Unique constraints on match_id + notification_type and article_id

Rate Limiting

• 200ms delay between individual emails to avoid SMTP throttling
• Consider using a dedicated SMTP service for large subscriber lists

Token Security

• Subscriber tokens expire after 30 days
• Tokens are JWT-based with HMAC signing
• Use JWT_SECRET environment variable (never leave as default in production)

Blog Notifications

• Only trigger when published changes from false to true
• Manual DB updates won't trigger (only through admin API/UI)

Match Data

• Relies on cached FACR data in cache/prefetch/facr_club_info.json
• Ensure prefetch service is running and cache is fresh

📊 Monitoring

Check System Status

-- Active subscribers
SELECT COUNT(*) FROM newsletter_subscriptions WHERE is_active = true;

-- Sent newsletters today
SELECT newsletter_type, COUNT(*), SUM(recipients_count) 
FROM newsletter_sent_log 
WHERE DATE(sent_at) = CURRENT_DATE 
GROUP BY newsletter_type;

-- Recent blog notifications
SELECT article_id, sent_at, recipients_count 
FROM blog_notifications 
ORDER BY sent_at DESC LIMIT 10;

-- Recent match notifications
SELECT match_id, notification_type, sent_at, recipients_count 
FROM match_notifications 
ORDER BY sent_at DESC LIMIT 10;

-- Email analytics
SELECT event_type, COUNT(*) 
FROM email_event 
WHERE DATE(created_at) = CURRENT_DATE 
GROUP BY event_type;

Admin API

GET /api/v1/admin/newsletter/status

🐛 Troubleshooting

Issue	Solution
No emails sent	Check newsletter_enabled and individual type flags in settings
Duplicate emails	Check tracking tables for existing notifications
Wrong schedule	Verify timezone, day, and hour settings
Blog notification not sent	Ensure article was published via API (not manual DB update)
Match data missing	Verify prefetch cache is populated

📖 Full Documentation

See NEWSLETTER_SYSTEM.md for:

• Detailed API reference
• Database schema documentation
• Email template variables
• Security considerations
• Future enhancement ideas

✨ Next Steps

1. Run migration to create tracking tables
2. Enable system via admin API
3. Configure settings for your club's schedule
4. Test each newsletter type individually
5. Monitor logs for first automated sends
6. Gather user feedback and adjust settings

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Implementation Date: 2025-09-30
Status: ✅ Complete and Ready for Production
Developer Notes: All requested features implemented. System is modular, well-documented, and ready for deployment.