update db connection for production and add init_db.php

api/init_db.php

@@ -0,0 +1,20 @@
+<?php
+require_once 'db.php';
+
+$sql = "
+CREATE TABLE IF NOT EXISTS features (
+    id VARCHAR(100) PRIMARY KEY,
+    layer VARCHAR(50) NOT NULL,
+    data JSON NOT NULL,
+    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+);
+CREATE INDEX IF NOT EXISTS idx_layer ON features(layer);
+";
+
+try {
+    $pdo->exec($sql);
+    echo "Database table 'features' created successfully.";
+} catch (PDOException $e) {
+    echo "Error creating table: " . $e->getMessage();
+}
+?>