.agents/memory/2026-03-01-umap-projection-database-schema-bug.md

2026-03-01 Session Notes

UMAP Projection Database Schema Bug

Investigated a critical UMAP projection failure in the signetai daemon deployed on macOS. The error was a SQLiteError indicating the query referenced a non-existent column e.vector in the embeddings table schema. The issue occurred in the computeProjection function within packages/daemon/src/umap-projection.ts when processing embeddings for the memory projection visualization.

The debugging approach involved:

1. Grepping for e.vector references across the codebase (found 6 files)
2. Grepping for computeProjection function (found 2 files: daemon.ts and umap-projection.ts)
3. Beginning source code inspection of the problematic UMAP projection module

The root cause appeared to be a schema mismatch between the query being executed and the actual database schema, likely a migration gap or column naming inconsistency. Investigation was ongoing at session end.