Cannot delete some Datasources

[knusperkrone]

This is the case for UI and explicit API calls, the frontend also does not show any error message

org.postgresql.util.PSQLException: ERROR: update or delete on table "datasource" violates foreign key constraint "fkdhr9x05byn63qfej3i1vw975a" on table "data_import"
  Detail: Key (id)=(9) is still referenced from table "data_import".
	at org.postgresql.core.v3.QueryExecutorImpl.receiveErrorResponse(QueryExecutorImpl.java:2553) ~[postgresql-42.2.18.jar!/:42.2.18]
	at org.postgresql.core.v3.QueryExecutorImpl.processResults(QueryExecutorImpl.java:2285) ~[postgresql-42.2.18.jar!/:42.2.18]
	at org.postgresql.core.v3.QueryExecutorImpl.execute(QueryExecutorImpl.java:323) ~[postgresql-42.2.18.jar!/:42.2.18]
	at org.postgresql.jdbc.PgStatement.executeInternal(PgStatement.java:473) ~[postgresql-42.2.18.jar!/:42.2.18]
	at org.postgresql.jdbc.PgStatement.execute(PgStatement.java:393) ~[postgresql-42.2.18.jar!/:42.2.18]
	at org.postgresql.jdbc.PgPreparedStatement.executeWithFlags(PgPreparedStatement.java:164) ~[postgresql-42.2.18.jar!/:42.2.18]
	at org.postgresql.jdbc.PgPreparedStatement.executeUpdate(PgPreparedStatement.java:130) ~[postgresql-42.2.18.jar!/:42.2.18]
	at com.zaxxer.hikari.pool.ProxyPreparedStatement.executeUpdate(ProxyPreparedStatement.java:61) ~[HikariCP-3.4.5.jar!/:na]
	at com.zaxxer.hikari.pool.HikariProxyPreparedStatement.executeUpdate(HikariProxyPreparedStatement.java) ~[HikariCP-3.4.5.jar!/:na]
	at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.executeUpdate(ResultSetReturnImpl.java:197) ~[hibernate-core-5.4.28.Final.jar!/:5.4.28.Final]
	at org.hibernate.engine.jdbc.batch.internal.NonBatchingBatch.addToBatch(NonBatchingBatch.java:46) ~[hibernate-core-5.4.28.Final.jar!/:5.4.28.Final]
...

[georg-schwarz]

Thx!