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PR Review: Roadmap Documentation for Rusqlite Migration

Todo List:

• Read and analyze the modified ROADMAP.md file
• Apply 5-phase review methodology
• Assess backlog compliance criteria
• Provide structured review feedback with rating

Root Cause Analysis

Problem Being Solved: The current architecture has both native and WASM engines using better-sqlite3 for DB operations, creating a "dual-SQLite-in-one-process problem" where the native engine could benefit from pure Rust rusqlite operations for better performance. PR #651 introduced rusqlite for bulk AST insertion, but all other DB operations still go through better-sqlite3.

Why This Approach: The planned migration makes architectural sense - segregating DB engines by runtime path (native → rusqlite, WASM → better-sqlite3) would eliminate the dual-connection complexity and unlock Rust-speed for all DB operations on the native path. The phased approach (6.13-6.17) is methodical and reduces risk.

Risk Assessment: Low risk - this is documentation-only planning. The actual implementation will require careful parity testing between engines, but the roadmap properly identifies this need.

Backlog Compliance

• Zero-dep: ✓ — No new runtime dependencies; rusqlite is already introduced in PR perf(ast): bulk-insert AST nodes via native Rust/rusqlite #651
• Foundation-aligned: ✓ — Aligns with P2 (native speed, universal reach) by optimizing native engine performance while maintaining WASM fallback
• Problem-fit: 3 — Improves performance for native engine users but doesn't directly address the core "lost AI agents" problem; more of an optimization than a navigation/context enhancement
• Breaking: No — All changes are internal architecture; CLI/API contracts remain unchanged
• Tier: 1 (zero-dep ✓ + foundation-aligned ✓)

Assessment

Phase 1: Root Cause Analysis ✅

This PR addresses a legitimate architectural concern identified after PR #651. The problem is real - having both SQLite engines in the same process is suboptimal for the native path.

Phase 2: Configuration Change Detection ✅

No configuration changes - this is pure documentation.

Phase 3: Test Integrity ✅

No test changes - documentation only.

Phase 4: Code Quality ✅

Documentation is well-structured, detailed, and follows existing roadmap patterns. The phase breakdown is logical:

• 6.13: Foundation (connection lifecycle)
• 6.14: Read operations migration
• 6.15: Write operations migration
• 6.16: Edge cases and dynamic SQL
• 6.17: Cleanup and isolation

Phase 5: Backlog Compliance ✅

Properly updates phase count from "7 of 12 done" to "7 of 17 done" to reflect new scope.

Critical Concerns

None - this is solid planning documentation.

Final Recommendation

• Rating: ⭐⭐⭐⭐☆ (4/5)
• Action: APPROVE
• Reasoning: Well-planned architectural improvement with clear phases, proper scope expansion documentation, and no breaking changes. Loses one star only because it's an internal optimization rather than a user-facing feature that directly addresses the core AI navigation problem.

Greptile Summary

This PR adds five new roadmap sub-phases (6.13–6.17) to docs/roadmap/ROADMAP.md, planning the full migration of all DB operations from better-sqlite3 to rusqlite on the native engine path. The Phase 6 overview item count is correctly updated from 12 to 17. The previously flagged incorrect "3 → 4 runtime deps" claim in 6.17 has been fixed — the file now explicitly states the dep count stays at 3 since rusqlite is compiled into the native addon.\n\n- Phase 6.13 defines the NativeDatabase napi-rs class as the foundation for all subsequent migrations\n- Phase 6.14 plans migrating all 41 Repository read methods with a parity test suite\n- Phase 6.15 covers all build-pipeline write operations and consolidates scattered rusqlite usage\n- Phase 6.16 handles NodeQuery dynamic SQL edge cases and miscellaneous DB patterns\n- Phase 6.17 is the cleanup phase: lazy-loading better-sqlite3, removing the double-connection pattern, and updating README — dep count correctly noted as unchanged\n\nOne minor overlap was identified: both 6.15 and 6.17 describe consolidating bulk_insert_ast_nodes into the shared NativeDatabase connection, which could confuse the implementer about when that work actually happens.

Confidence Score: 5/5

Docs-only roadmap change; no code modified; prior dep-count concern resolved; safe to merge.

The only changed file is a roadmap Markdown document. The previously raised concern about the incorrect '3→4 deps' claim has been addressed in the latest commit. The single remaining note (task duplication between 6.15 and 6.17) is editorial and does not block merging. Phase numbering is sequential and internally consistent.

No files require special attention — this is a documentation-only PR.

Important Files Changed

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A["6.13 — NativeDatabase class\n(rusqlite connection lifecycle)"]
    B["6.14 — Native Read Queries\n(41 Repository methods → Rust)"]
    C["6.15 — Native Write Operations\n(build-pipeline writes → Rust)"]
    D["6.16 — Dynamic SQL & Edge Cases\n(NodeQuery builder, WAL, advisory locks)"]
    E["6.17 — Cleanup & Isolation\nbetter-sqlite3 lazy-load, README update"]

    A --> B
    A --> C
    B --> D
    C --> D
    D --> E

    subgraph result["End state"]
        F["Native engine → rusqlite only"]
        G["WASM engine → better-sqlite3 only"]
    end
    E --> result

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