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THE REAL PROBLEM: Every new data source produces different doc_id prefixes in vector indexes (W-, W500K-, W5K-, CAND-). Hybrid search had to hardcode strip_prefix for each one. New datasets broke hybrid until someone added another prefix. This violates "any data source without pre-defined schemas." THE FIX: IndexMeta.id_prefix — the catalog records what prefix each index uses. Hybrid search reads it and strips automatically. Legacy indexes fall back to heuristic stripping. New indexes can set id_prefix=None to use raw IDs (no prefix, no stripping needed). This means: ingest a new dataset, embed it, hybrid search works immediately without code changes. The system is truly source-agnostic. Also: full ADR document at docs/ADR-020-universal-id-mapping.md with the three options considered and rationale for the chosen approach. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>