teernisse 0e9091f56e feat: add SQLite cache store for incremental session persistence ...

Implement the caching layer that enables fast subsequent runs by
persisting parsed session data in SQLite:

- store/schema.go: DDL for three tables — sessions (primary metrics
  with file_mtime_ns/file_size for change detection), session_models
  (per-model breakdown, FK cascade on delete), and file_tracker
  (path -> mtime+size mapping for cache invalidation). Indexes on
  start_time and project for efficient time-range and filter queries.

- store/cache.go: Cache struct wrapping database/sql with WAL mode
  and synchronous=normal for concurrent read safety and write
  performance. Key operations:

  * Open: creates the cache directory, opens/creates the database,
    and ensures the schema is applied (idempotent via IF NOT EXISTS).

  * GetTrackedFiles: returns the mtime/size map used by the pipeline
    to determine which files need reparsing.

  * SaveSession: transactional upsert of session stats + model
    breakdown + file tracker entry. Uses INSERT OR REPLACE to handle
    both new files and files that changed since last parse.

  * LoadAllSessions: batch-loads all cached sessions with a two-pass
    strategy — first loads session rows, then batch-loads model data
    with an index map for O(1) join, avoiding N+1 queries.

  Uses modernc.org/sqlite (pure-Go, no CGO) for zero-dependency
  cross-platform builds.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

2026-02-19 13:01:40 -05:00

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