fix(sql-playground): fix Online-Marktplatzsystem template #1262

Job	Run time
API Docs Validation	8s
Gradle Wrapper Validation	5s
fbs-core.api / DB Migration Validation	2s
fbs-eat / Lint	24s
fbs-eat / Test	28s
fbs-sql-checker / Lint	25s
fbs-sql-checker / Test	29s
Build Docker images	5m 22s
fbs-core.api / Test	2m 28s
fbs-core.api / Lint	42s
fbs-core.web / Lint	1m 16s
fbs-core.web / Test	2m 21s
fbs-runner.checker / Lint	21s
fbs-runner.checker / Test	34s
	15m 5s

Provide feedback