Added get a total count records

Signed-off-by: Valentin Popov <info@valentineus.link>

classes/local/api.php

@@ -187,6 +187,18 @@ final class api {
         return $services;
     }
 
+    /**
+     * Get a total count of existing records.
+     *
+     * @return int
+     * @throws \dml_exception
+     */
+    public static function get_total_count(): int {
+        global $DB;
+
+        return $DB->count_records(LW_TABLE_SERVICES);
+    }
+
     /**
      * Update an existing record in the database.
      *