feat: Add turtle state persistence functions for saving, retrieving, and deleting turtle states

server/database.js

@@ -666,5 +666,40 @@ export function deleteBlocksInArea(fromX, fromY, fromZ, toX, toY, toZ) {
   );
 }
 
+// ========== BLOCK DELETION ==========
+
+export function deleteBlock(x, y, z) {
+  const stmt = db.prepare('DELETE FROM world_blocks WHERE x = ? AND y = ? AND z = ?');
+  return stmt.run(x, y, z);
+}
+
+// ========== TURTLE STATE PERSISTENCE ==========
+
+export function saveTurtleState(turtleId, stateName, stateData = {}) {
+  const stmt = db.prepare(`
+    INSERT OR REPLACE INTO turtle_state (turtle_id, state_name, state_data, updated_at)
+    VALUES (?, ?, ?, ?)
+  `);
+  stmt.run(turtleId, stateName, JSON.stringify(stateData), Date.now());
+}
+
+export function getTurtleState(turtleId) {
+  const stmt = db.prepare('SELECT * FROM turtle_state WHERE turtle_id = ?');
+  const row = stmt.get(turtleId);
+  if (row) {
+    return {
+      stateName: row.state_name,
+      stateData: JSON.parse(row.state_data),
+      updatedAt: row.updated_at,
+    };
+  }
+  return null;
+}
+
+export function deleteTurtleState(turtleId) {
+  const stmt = db.prepare('DELETE FROM turtle_state WHERE turtle_id = ?');
+  return stmt.run(turtleId);
+}
+
 // Export database instance for custom queries if needed
 export { db };