Заменил используемую СУБД Postgres на MySQL

https://spring.io/guides/gs/accessing-data-mysql

src/main/resources/application.properties

@@ -1,6 +1,6 @@
-spring.jpa.hibernate.ddl-auto = update
-spring.datasource.url=jdbc:postgresql://localhost:5454/sweater_db
+spring.jpa.hibernate.ddl-auto=update
+spring.datasource.url=jdbc:mysql://${MYSQL_HOST:localhost}:3306/sweater_db
 spring.datasource.username=user
 spring.datasource.password=123456
-spring.datasource.driver-class-name=org.postgresql.Driver
-spring.jpa.show-sql: true
+spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
+