Method cacheNode

src/db/queries.ts:855–864

* Add a node to the cache, evicting oldest if needed

(node: Node)

   * Add a node to the cache, evicting oldest if needed
   */
  private cacheNode(node: Node): void {
    if (this.nodeCache.size >= this.maxCacheSize) {
      // Evict oldest (first) entry
      const firstKey = this.nodeCache.keys().next().value;
      if (firstKey) {
        this.nodeCache.delete(firstKey);
      }
    }
    this.nodeCache.set(node.id, node);
  }

  /**
   * Clear the node cache