openclaw - 💡(How to fix) Fix [Bug]: mem0 plugin 'ghost writes' - memory_add returns success but database remains empty [2 comments, 2 participants]

Description

The @mem0/openclaw-mem0 plugin is exhibiting 'ghost write' behavior. The memory_add tool returns a success message (e.g., 'Stored...'), but the underlying SQLite database remains empty.

Evidence

1. Tool Output: memory_add returns success.
2. Database State: Running sqlite3 ~/.mem0/vector_store.db 'SELECT count(*) FROM vectors;' consistently returns 0, even immediately after a perceived successful write.
3. Migration Failure: A full migration of MEMORY.md and daily logs was attempted via sub-agent; while the sub-agent reported success, the DB remained empty.

Potential Relation

This may be related to #77822, where duplicate register() calls cause closure variables to be unsynchronized, potentially leading to the plugin writing to a volatile or incorrect instance of the memory manager.

Environment

• OS: Linux
• Plugin: openclaw-mem0