feat: integrate WorldBlockCache for efficient world block management and update logging

server/server.js

@@ -5,6 +5,7 @@ import { createServer } from 'http';
 import * as db from './database.js';
 import { Turtle } from './Turtle.js';
 import { TaskDispatcher } from './TaskDispatcher.js';
+import { WorldBlockCache } from './WorldBlockCache.js';
 
 const app = express();
 const PORT = 3001;
@@ -49,14 +50,14 @@ db.initializeDatabase();
 // Load persisted data from database
 console.log('📂 Loading persisted data from database...');
 const savedHomes = db.getAllTurtleHomes();
-const savedBlocks = db.getWorldBlocks();
+const blockCount = db.getWorldBlockCount();
 console.log(`   Loaded ${savedHomes.length} turtle homes`);
-console.log(`   Loaded ${savedBlocks.length} world blocks`);
+console.log(`   ${blockCount} world blocks in database (demand-loaded)`);
 
 // Store connected web clients and turtle data
 const webClients = new Set();
 const turtles = new Map(); // turtleID -> Turtle instance
-const worldBlocks = new Map(); // "x,y,z" -> {name, metadata, discoveredBy, timestamp}
+const worldBlocks = new WorldBlockCache(db, parseInt(process.env.BLOCK_CACHE_SIZE || '50000', 10));
 const turtleHomes = new Map(); // turtleID -> {x, y, z} home position
 const turtleConfig = new Map(); // turtleID -> {maxDistance, facing, etc}
 
@@ -65,17 +66,6 @@ for (const home of savedHomes) {
   turtleHomes.set(home.turtle_id, { x: home.x, y: home.y, z: home.z });
 }
 
-// Load saved blocks into memory
-for (const block of savedBlocks) {
-  const key = `${block.x},${block.y},${block.z}`;
-  worldBlocks.set(key, {
-    name: block.block_name,
-    metadata: block.metadata,
-    discoveredBy: block.discovered_by,
-    timestamp: block.discovered_at
-  });
-}
-
 // Timeout for considering turtles offline (30 seconds)
 const TURTLE_TIMEOUT = 30000;