Removing Space with multiple Page Templates and multiple page templates versions will fail with Foreign Key Contraints

Cause

org.springframework.dao.DataIntegrityViolationException: Hibernate operation: could not delete: [com.atlassian.confluence.pages.templates.PageTemplate#8782084]; SQL []; ERROR: update or delete on table "pagetemplates" violates foreign key constraint "fkbc7ce96a17d4a070" on table "pagetemplates" Detail: Key (templateid)=(8782084) is still referenced from table "pagetemplates".; nested exception is org.postgresql.util.PSQLException: ERROR: update or delete on table "pagetemplates" violates foreign key constraint "fkbc7ce96a17d4a070" on table "pagetemplates" Detail: Key (templateid)=(8782084) is still referenced from table "pagetemplates".
    at org.springframework.jdbc.support.SQLStateSQLExceptionTranslator.translate(SQLStateSQLExceptionTranslator.java:110)

caused by: org.postgresql.util.PSQLException: ERROR: update or delete on table "pagetemplates" violates foreign key constraint "fkbc7ce96a17d4a070" on table "pagetemplates" Detail: Key (templateid)=(8782084) is still referenced from table "pagetemplates".
    at org.postgresql.core.v3.QueryExecutorImpl.receiveErrorResponse(QueryExecutorImpl.java:2062)
Stack Trace:[hide]

org.springframework.dao.DataIntegrityViolationException: Hibernate operation: could not delete: [com.atlassian.confluence.pages.templates.PageTemplate#8782084]; SQL []; ERROR: update or delete on table "pagetemplates" violates foreign key constraint "fkbc7ce96a17d4a070" on table "pagetemplates"
  Detail: Key (templateid)=(8782084) is still referenced from table "pagetemplates".; nested exception is org.postgresql.util.PSQLException: ERROR: update or delete on table "pagetemplates" violates foreign key constraint "fkbc7ce96a17d4a070" on table "pagetemplates"
  Detail: Key (templateid)=(8782084) is still referenced from table "pagetemplates".
Caused by: org.postgresql.util.PSQLException: ERROR: update or delete on table "pagetemplates" violates foreign key constraint "fkbc7ce96a17d4a070" on table "pagetemplates"
  Detail: Key (templateid)=(8782084) is still referenced from table "pagetemplates".
	at org.postgresql.core.v3.QueryExecutorImpl.receiveErrorResponse(QueryExecutorImpl.java:2062)
	at org.postgresql.core.v3.QueryExecutorImpl.processResults(QueryExecutorImpl.java:1795)
	at org.postgresql.core.v3.QueryExecutorImpl.execute(QueryExecutorImpl.java:257)
	at org.postgresql.jdbc2.AbstractJdbc2Statement.execute(AbstractJdbc2Statement.java:479)
	at org.postgresql.jdbc2.AbstractJdbc2Statement.executeWithFlags(AbstractJdbc2Statement.java:367)
	at org.postgresql.jdbc2.AbstractJdbc2Statement.executeUpdate(AbstractJdbc2Statement.java:321)
	at com.mchange.v2.c3p0.impl.NewProxyPreparedStatement.executeUpdate(NewProxyPreparedStatement.java:105)
	at net.sf.hibernate.impl.NonBatchingBatcher.addToBatch(NonBatchingBatcher.java:22)
	at net.sf.hibernate.persister.EntityPersister.delete(EntityPersister.java:581)
	at net.sf.hibernate.impl.ScheduledDeletion.execute(ScheduledDeletion.java:29)
	at net.sf.hibernate.impl.SessionImpl.execute(SessionImpl.java:2449)
	at net.sf.hibernate.impl.SessionImpl.executeAll(SessionImpl.java:2435)
	at net.sf.hibernate.impl.SessionImpl.execute(SessionImpl.java:2397)
	at net.sf.hibernate.impl.SessionImpl.autoFlushIfRequired(SessionImpl.java:1821)
	at net.sf.hibernate.impl.SessionImpl.getQueries(SessionImpl.java:1578)
	at net.sf.hibernate.impl.SessionImpl.find(SessionImpl.java:1543)
	at net.sf.hibernate.impl.QueryImpl.list(QueryImpl.java:49)
	at org.springframework.orm.hibernate.HibernateTemplate$20.doInHibernate(HibernateTemplate.java:731)
	at org.springframework.orm.hibernate.HibernateTemplate.execute(HibernateTemplate.java:370)
	at org.springframework.orm.hibernate.HibernateTemplate.find(HibernateTemplate.java:717)
	at org.springframework.orm.hibernate.HibernateTemplate.find(HibernateTemplate.java:700)
	at bucket.search.persistence.dao.hibernate.HibernateIndexQueueEntryDao.getNewEntries(HibernateIndexQueueEntryDao.java:49)
	at sun.reflect.GeneratedMethodAccessor311.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:304)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:182)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:149)
	at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:106)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
	at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
	at $Proxy15.getNewEntries(Unknown Source)
	at com.atlassian.confluence.search.lucene.queue.DatabaseIndexTaskQueue.getUnflushedEntries(DatabaseIndexTaskQueue.java:163)
	at com.atlassian.confluence.search.lucene.queue.DatabaseIndexTaskQueue.flushQueue(DatabaseIndexTaskQueue.java:146)
	at com.atlassian.confluence.search.lucene.DefaultConfluenceIndexManager.flushQueue(DefaultConfluenceIndexManager.java:94)
	at sun.reflect.GeneratedMethodAccessor310.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:304)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:182)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:149)
	at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:106)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
	at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
	at $Proxy36.flushQueue(Unknown Source)
	at com.atlassian.confluence.spaces.DefaultSpaceManager.removeSpace(DefaultSpaceManager.java:172)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:304)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:182)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:149)
	at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:106)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
	at com.atlassian.spring.interceptors.SpringProfilingInterceptor.invoke(SpringProfilingInterceptor.java:16)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
	at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
	at $Proxy41.removeSpace(Unknown Source)