Convert model name from PascalCase to snake_case (table name).

src/Libs/Model.php

@@ -287,7 +287,14 @@ class Model {
      */
     public static function className(): string
     {
-        return strtolower(substr(strrchr(get_called_class(), '\\'), 1));
+        return strtolower(
+            preg_replace(
+                '/(?<!^)[A-Z]/', '_$0',
+                substr(
+                    strrchr(get_called_class(), '\\'), 1
+                )
+            )
+        );
     }
 
     /**