Method getNodesByIds

src/db/queries.ts:453–488

* Batch lookup: fetch many nodes by ID in a single SQL round-trip. * * Replaces the N+1 pattern in graph traversal where every edge would * trigger its own `getNodeById` call. For a function with 50 callers * this collapses 50 point reads into one IN-list query (~10-50x * faster end-t

(ids: readonly string[])

   * the SQL query only touches the misses.
   */
  getNodesByIds(ids: readonly string[]): Map<string, Node> {
    const out = new Map<string, Node>();
    if (ids.length === 0) return out;

    // Serve cache hits first; build the miss list for SQL.
    const misses: string[] = [];
    for (const id of ids) {
      const cached = this.nodeCache.get(id);
      if (cached !== undefined) {
        // LRU touch
        this.nodeCache.delete(id);
        this.nodeCache.set(id, cached);
        out.set(id, cached);
      } else {
        misses.push(id);
      }
    }
    if (misses.length === 0) return out;

    // Chunk under SQLite's parameter limit (default 999, raised to 32766
    // in better-sqlite3 builds — chunk at 500 for safety across both
    // backends and to keep the query plan simple).
    for (let i = 0; i < misses.length; i += SQLITE_PARAM_CHUNK_SIZE) {
      const chunk = misses.slice(i, i + SQLITE_PARAM_CHUNK_SIZE);
      const placeholders = chunk.map(() => '?').join(',');
      const rows = this.db
        .prepare(`SELECT * FROM nodes WHERE id IN (${placeholders})`)
        .all(...chunk) as NodeRow[];
      for (const row of rows) {
        const node = rowToNode(row);
        out.set(node.id, node);
        this.cacheNode(node);
      }
    }
    return out;
  }

  private getExistingNodeIds(ids: readonly string[]): Set<string> {
    const out = new Set<string>();