Add methods to retrieve and analyze product sales data, send department statistics to Slack, and implement scheduled messaging logic

services/nginx/app/classes/db.php

@@ -22,6 +22,17 @@ class db
         $this->database = $config['database'];
     }
 
+    public static function getPDO(): \PDO
+    {
+        global $config;
+        $dsn = "mysql:host={$config['db']['host']};dbname={$config['db']['database']};charset=utf8mb4";
+        return new \PDO($dsn, $config['db']['user'], $config['db']['password'], [
+            \PDO::ATTR_ERRMODE => \PDO::ERRMODE_EXCEPTION,
+            \PDO::ATTR_DEFAULT_FETCH_MODE => \PDO::FETCH_ASSOC,
+            \PDO::ATTR_EMULATE_PREPARES => false,
+        ]);
+    }
+
     public function connect(): void
     {
         global $response;