Retrieval + Ranking

VaultCrux retrieval is hybrid:

• Vector similarity from pgvector adapter
• Lexical relevance from Postgres full-text (ts_rank)
• Recency decay score

Final score uses weighted fusion:

• vector: 0.58
• lexical: 0.32
• recency: 0.10

Lane controls:

• light
• verified
• audit

Lane configs are defined in VaultCrux/packages/core/src/laneConfig.ts.

Vector backend controls:

• FEATURE_QDRANT_READ=true switches retrieval vector reads to Qdrant.
• FEATURE_VECTOR_DUAL_WRITE=true writes vectors to pgvector and Qdrant in parallel.