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Garry TanandClaude Opus 4.7
0c2b1da72c
Schema migration v56 (code_traversal_cache_v0_34):
- new table: code_traversal_cache (id, symbol_qualified, depth,
source_id, response_json JSONB, max_chunk_updated_at, xmin_max,
cluster_generation, computed_at)
- unique index on (symbol_qualified, depth, source_id)
- secondary index on source_id for cheap source-scoped clears
D3 — generation-counter cache invalidation. cluster_generation is a
BIGINT column on every cache row; bumped once per recompute_code_clusters
phase via bumpClusterGeneration(). Cache rows referencing stale
generations naturally miss on read. Eliminates the bug class where
cluster recompute leaves stale cache entries that reference dropped or
renamed clusters.
D8 — destructive-guard parity. clearTraversalCache requires either
source_id OR all_sources=true. Without either it throws. Mirrors v0.26.5
destructive-guard pattern; the MCP op (code_traversal_cache_clear,
scope: admin, localOnly: true) inherits the gate.
- src/core/code-intel/traversal-cache.ts: cache module with public API
- getClusterGeneration / bumpClusterGeneration (config-backed counter)
- getCachedTraversal / putCachedTraversal (low-level read/write)
- getCachedOrCompute (try-cache-then-compute wrapper for W3 ops)
- clearTraversalCache (admin clear with source-scope gate)
- src/core/operations.ts: code_traversal_cache_clear op registered with
scope: 'admin' + localOnly: true. Dry-run aware; resolves source_id
from params or ctx.
v0.34.0.0 scope: cache writes use xmin_max=0 sentinel (no snapshot
isolation). REPEATABLE READ + xmin_max snapshot isolation + PGLite
serialization_failure retry is wired in the module but disabled by
default; v0.34.1 enables it once W3 ops produce enough load to justify
the correctness gain. Under low-write workloads (the common case for an
agent's plan-mode session, 5-15 blast calls without concurrent sync),
the cache stays correctness-safe via the cluster_generation invalidation
+ the natural UPSERT on conflict.
test/code-intel/traversal-cache.test.ts: 13 hermetic PGLite tests
covering cache hit/miss, D3 generation-counter invalidation, UPSERT
replacement, source-scoped + all-sources clear paths, and getCachedOrCompute
try-cache-then-compute happy path.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>