Fix: Campaign Builder inactivity filter uses wrong date field (FA-19)

[konard]

Summary

Fixes the Campaign Segment Builder's "No activity in last X days" filter which was incorrectly returning the same subscribers regardless of the number of days specified.

Root cause: The filter was using subscriber_drips.updated_at which tracks when the drip record was last modified (stage changes, etc.), NOT when the subscriber was last emailed.

Solution

Track email sends in SQLite to enable accurate inactivity filtering:

1. New email_sends Table

Added SQLite table to track all email sends:

• subscriber_id - SQLite subscriber ID
• email_type - Type: 'drip', 'dunning', or 'campaign'
• product_id - For drip emails
• campaign_id - For campaign emails
• template_id - Listmonk template ID
• sent_at - Timestamp of send

2. Track Drip/Dunning Sends

Updated DripProcessor and DunningProcessor to log sends to the new table after each successful email send.

3. Track Campaign Sends (via Listmonk Messenger)

Added /api/webhook/messenger endpoint that receives campaign send notifications from Listmonk's messenger system. This allows tracking of all campaign emails sent via this custom messenger.

Setup: Configure a new messenger in Listmonk pointing to https://your-domain/api/webhook/messenger

4. Updated Inactivity Query

Changed the filter in home.php to query the new email_sends table:

NOT EXISTS (
    SELECT 1 FROM email_sends e
    WHERE e.subscriber_id = s.id
      AND e.sent_at >= datetime('now', '-X days')
)

Files Changed

• shared/src/SequenceDatabase.php - Added email_sends table and methods
• campaign-list-builder/public/index.php - Added messenger webhook endpoint
• campaign-list-builder/templates/home.php - Updated inactivity filter SQL
• drip-controller/src/DripProcessor.php - Log drip sends
• drip-controller/src/DunningProcessor.php - Log dunning sends

Test Plan

• Verify email_sends table is created on database initialization
• Send a drip email and verify it's logged in email_sends
• Send a dunning email and verify it's logged in email_sends
• Configure Listmonk messenger and send a campaign, verify sends are logged
• Test inactivity filter with different day values - should now return different results
• Verify existing functionality (drip processing, dunning, segment builder) still works

Note on Migration

For existing subscribers who have received emails before this change, the email_sends table will be empty. The inactivity filter will correctly identify them as inactive (no email send records). You may want to backfill data if historical accuracy is important.

Fixes #2

🤖 Generated with Claude Code

[konard]

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