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Phases 9-15 designed based on "future regret" analysis: - Phase 9: Event journal (append-only mutation history — can't retrofit) - Phase 10: Rich catalog v2 (ownership, sensitivity, lineage, freshness) - Phase 11: Embedding versioning (model-proof vector layer) - Phase 12: Tool registry (governed agent actions via MCP) - Phase 13: Security & access control (field-level, row-level, audit) - Phase 14: Schema evolution with AI migration rules - Phase 15+: Federated query, DB connectors, OCR, fine-tuned models 8 design principles: store truth openly, describe richly, never destroy evidence, secure centrally, expose through tools, version everything, unstructured first-class, separate storage/compute/intelligence. ADR-012 through ADR-016 documenting key future-proofing decisions. Updated benchmarks: 2.47M rows, hot cache 9.8x speedup. Updated operating rules: cheap-now/expensive-later built first. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>