feat: Add player positions tracking to database

server/database.js

@@ -133,6 +133,17 @@ export function initializeDatabase() {
     )
   `);
 
+  // Player positions table (for tracking pocket computer users)
+  db.exec(`
+    CREATE TABLE IF NOT EXISTS player_positions (
+      player_id INTEGER PRIMARY KEY,
+      x INTEGER NOT NULL,
+      y INTEGER NOT NULL,
+      z INTEGER NOT NULL,
+      updated_at INTEGER NOT NULL
+    )
+  `);
+
   // Create indexes for better performance
   db.exec(`
     CREATE INDEX IF NOT EXISTS idx_world_blocks_discovered 
@@ -455,6 +466,25 @@ export function getSessionStats(turtleId, limit = 10) {
   return stmt.all(turtleId, limit);
 }
 
+// Player Positions
+export function savePlayerPosition(playerId, position) {
+  const stmt = db.prepare(`
+    INSERT OR REPLACE INTO player_positions (player_id, x, y, z, updated_at)
+    VALUES (?, ?, ?, ?, ?)
+  `);
+  stmt.run(playerId, position.x, position.y, position.z, Date.now());
+}
+
+export function getPlayerPosition(playerId) {
+  const stmt = db.prepare('SELECT x, y, z, updated_at FROM player_positions WHERE player_id = ?');
+  return stmt.get(playerId);
+}
+
+export function getAllPlayerPositions() {
+  const stmt = db.prepare('SELECT player_id, x, y, z, updated_at FROM player_positions');
+  return stmt.all();
+}
+
 // Cleanup function
 export function closeDatabase() {
   db.close();