Add new files and make code improvements

include/bd_pdo_rest.php

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+<?php
+require_once "/usr/share/nginx/html/paad/vendor/autoload.php";
+$dotenv = Dotenv\Dotenv::createImmutable(__DIR__);
+$dotenv->load();
+use \SeinopSys\PostgresDb;
+
+# Connect to the database
+try {
+    // Postgres
+    $pdo = new PDO("pgsql:host=" . $_ENV['DB_HOST'] . ";dbname=" . $_ENV['DB_NAME'], $_ENV['DB_USER'], $_ENV['DB_PASS']);
+    $pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
+
+    $db = new PostgresDb();
+    $db->setConnection($pdo);
+} catch (PDOException $e) {
+    echo "Error: " . $e->getMessage();
+}
+
+// check recursivelly if the array has only empty strings
+function is_response_empty($array)
+{
+    foreach ($array as $value) {
+        if (is_array($value)) {
+            if (!is_response_empty($value)) {
+                return false;
+            }
+        } else {
+            if (!empty($value)) {
+                return false;
+            }
+        }
+    }
+    return true;
+}
+
+// SQL function
+function query(string $sql, array $params = null, bool $single = true)
+{
+    global $pdo;
+    try {
+        $stmt = $pdo->prepare($sql);
+        $stmt->execute($params);
+        $response = $single ? $stmt->fetch(PDO::FETCH_ASSOC) : $stmt->fetchAll(PDO::FETCH_ASSOC);
+
+        return $response;
+    } catch (PDOException $e) {
+        echo "Error: " . $e->getMessage();
+        return false;
+    } finally {
+        $stmt->closeCursor();
+        $stmt = null;
+    }
+}
+
+function queryAll(string $sql, array $params = null)
+{
+    return query($sql, $params, false);
+}
+
+function toSQLArray(array $array): string
+{
+    return sprintf("{%s}", implode(", ", $array));
+}

include/db/postgrest.conf

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+# postgrest.conf
+
+# The standard connection URI format, documented at
+# https://www.postgresql.org/docs/current/libpq-connect.html#LIBPQ-CONNSTRING
+db-uri       = "postgres://postgres:4ud1t0rf4lt4$$@localhost:5432/paad_pruebas"
+
+# The database role to use when no client authentication is provided.
+# Should differ from authenticator
+db-anon-role = "postgres"
+
+# The secret to verify the JWT for authenticated requests with.
+# Needs to be 32 characters minimum.
+jwt-secret           = "reallyreallyreallyreallyverysafe"
+jwt-secret-is-base64 = false
+
+# Port the postgrest process is listening on for http requests
+server-port = 3000
+
+# the location root is /api 
+server-host = "*"