Moods Bi-Directional Sync - Implementation Complete ✅#

Date: 2025-10-14

Summary#

Successfully implemented bi-directional sync between MongoDB and ATProto for aesthetic.computer moods, including migration of existing data and cleanup of duplicates.

What Was Done#

1. Dual-Write Implementation ✅#

Created mood-atproto.mjs helper module with sync functions
Updated mood.mjs Netlify function to write to both MongoDB and ATProto
Added error handling (ATProto failures don't block mood creation)
MongoDB updated with atproto.rkey after successful ATProto sync

2. Migration & Sync ✅#

Created sync-mongodb-from-atproto.mjs to sync existing ATProto records back to MongoDB
Migrated all 222 @jeffrey moods successfully
MongoDB now has atproto: { rkey } field for all moods
ATProto has mongoId field for all moods

3. Duplicate Cleanup ✅#

Found and deleted 140 duplicate ATProto records (from interrupted migration)
Kept only the records referenced by MongoDB
Verified: 222 moods in both systems, no duplicates

Current State#

MongoDB Schema#

{
  _id: ObjectId("..."),
  user: "auth0|...",
  mood: "text content",
  when: ISODate("..."),
  atproto: {
    rkey: "3m36qcr3bg22g"  // 13 bytes reference to ATProto record
  }
}

ATProto Schema (computer.aesthetic.mood)#

{
  $type: "computer.aesthetic.mood",
  mood: "text content",     // max 5000 chars
  when: "2025-10-09T...",   // ISO 8601
  mongoId: "68e8064c..."    // reference to MongoDB _id
}

Files Created/Modified#

New Files#

/system/backend/mood-atproto.mjs - ATProto sync helper functions
/system/backend/sync-mongodb-from-atproto.mjs - Sync MongoDB from existing ATProto records
/system/backend/delete-atproto-duplicates.mjs - Clean up duplicate ATProto records
/at/scripts/check-mood-sync.mjs - Verify MongoDB sync status
/at/scripts/check-atproto-moods.mjs - Query ATProto PDS for moods
/at/scripts/check-atproto-duplicates.mjs - Detect duplicate ATProto records

Modified Files#

/system/netlify/functions/mood.mjs - Added dual-write logic in POST handler

Migration Results - @jeffrey#

Metric	Count
Total MongoDB moods	222
Moods synced to ATProto	222
ATProto records (after cleanup)	222
Duplicates removed	140

How It Works#

New Mood Flow#

User posts mood via API (POST /api/mood)
Mood inserted into MongoDB → gets _id
createMoodOnAtproto() called with mongoId
ATProto record created → returns rkey
MongoDB updated: { atproto: { rkey } }
If ATProto fails: mood still saved in MongoDB, error logged

Bi-Directional Sync Benefits#

Fast lookups both ways: MongoDB→ATProto and ATProto→MongoDB
Resilience: Either system can rebuild from the other
Data integrity: Cross-references validate consistency
Migration safety: Can verify sync status anytime

Next Steps#

Immediate#

Test dual-write with a real mood post via web interface
Verify new mood appears on both MongoDB and ATProto

Before Migrating Other Users#

Test with 1-2 more users to validate process
Update delete-erase-and-forget-me.mjs to delete from ATProto
Consider rate limiting (ATProto may have API limits)

Later#

Migrate remaining users' moods
Add ATProto deletion to user account deletion
Monitor dual-write success rate
Consider batch sync job for any failed writes

Scripts for Ongoing Maintenance#

# Check sync status for a user
cd /workspaces/aesthetic-computer/at
node scripts/check-mood-sync.mjs <handle>

# Check ATProto moods
node scripts/check-atproto-moods.mjs <handle>

# Check for duplicates
node scripts/check-atproto-duplicates.mjs <handle>

# Sync MongoDB from ATProto (if needed)
cd /workspaces/aesthetic-computer/system
node backend/sync-mongodb-from-atproto.mjs <handle>

# Clean up duplicates
node backend/delete-atproto-duplicates.mjs <handle> --delete

Technical Notes#

Why Minimal Nested Approach?#

Only stores atproto.rkey in MongoDB (13 bytes)
Alternative (full ATProto URI, DID, etc.) would be 170+ bytes
Keeps MongoDB documents lean
Can reconstruct full URI: at://${did}/computer.aesthetic.mood/${rkey}

Error Handling Strategy#

ATProto failures don't block MongoDB writes
Ensures service availability even if ATProto is down
Can backfill ATProto records later from MongoDB
Logs errors for monitoring

Script Exit Issues Fixed#

Added process.exit(0) to all scripts
Previously hung due to open database connections
Scripts now exit cleanly after completing

Testing Checklist#

MongoDB has all moods with atproto.rkey
ATProto has all moods with mongoId
No duplicate ATProto records
Scripts exit cleanly
New mood via web interface creates both records
ATProto failure doesn't break mood posting
Second user migration works correctly

Status: ✅ Core implementation complete, ready for production testing

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