====== Database ======
===== Cizí klíč (Foreign Key) =====
  * 1:1
  * 1:N
  * N:M

===== reset AUTO INCREMENT =====
   ALTER TABLE tablename AUTO_INCREMENT = 1

Zdroj: https://www.viralpatel.net/reseting-mysql-autoincrement-column/ a https://stackoverflow.com/questions/8923114/how-to-reset-auto-increment-in-mysql