ERROR: insert or update on table "notifications" violates foreign key constraint "fk_eventid3"

This was seen at a customer running trunk:

org.postgresql.util.PSQLException: ERROR: insert or update on table "notifications" violates foreign key
constraint "fk_eventid3"
Detail: Key (eventid)=(<event id>) is not present in table "events".
at org.postgresql.core.v3.QueryExecutorImpl.receiveErrorResponse(QueryExecutorImpl.java:1525)
at org.postgresql.core.v3.QueryExecutorImpl.processResults(QueryExecutorImpl.java:1309)
at org.postgresql.core.v3.QueryExecutorImpl.execute(QueryExecutorImpl.java:188)
at org.postgresql.jdbc2.AbstractJdbc2Statement.execute(AbstractJdbc2Statement.java:452)
at org.postgresql.jdbc2.AbstractJdbc2Statement.executeWithFlags(AbstractJdbc2Statement.java:
354)
at org.postgresql.jdbc2.AbstractJdbc2Statement.executeUpdate(AbstractJdbc2Statement.java:308)
at com.mchange.v2.c3p0.impl.NewProxyPreparedStatement.executeUpdate
(NewProxyPreparedStatement.java:105)
at org.opennms.netmgt.config.NotificationManager.insertNotice(NotificationManager.java:628)
at org.opennms.netmgt.notifd.BroadcastEventProcessor.scheduleNoticesForEvent
(BroadcastEventProcessor.java:496)
at org.opennms.netmgt.notifd.BroadcastEventProcessor.onEvent(BroadcastEventProcessor.java:
216)
at org.opennms.netmgt.eventd.EventIpcManagerDefaultImpl$ListenerThread.run
(EventIpcManagerDefaultImpl.java:172)
at java.lang.Thread.run(Thread.java:595)