Trying to delete a page with id "foobar_2013" results in a PicklingError for a class that is no longer part of the buildout. Running zodbverify, I was able to find a reference to it.
```
Could not process <class 'z3c.relationfield.relation.RelationValue'> record '\x00\x00\x00\x00\x00\x03\xf4\x1e':
INFO:zodbverify:'cz3c.relationfield.relation\nRelationValue\nq\x01.}q\x02(U\x05to_idq\x03NU\x08_from_idq\x04J\xb9w\xfd\x0fU\x0efrom_attributeq\x05U\risReferencingq\x06U\n__parent__q\x07(U\x08\x00\x00\x00\x00\x00\x03\xfe\x1dcProducts.DecisionLog.content\nDecision\nq\x08tq\tQU\x0f_broken_to_pathq\nU\x1dfoobar-2013_MIGRATION_q\x0bu.'
INFO:zodbverify:Traceback (most recent call last):
File "/sprj/st_zope_plone5/buildouts/eggs/zodbverify-1.0.2-py2.7.egg/zodbverify/verify.py", line 60, in verify_record
unpickler.load()
ImportError: No module named DecisionLog.content
0: } EMPTY_DICT
1: q BINPUT 2
3: ( MARK
4: U SHORT_BINSTRING 'to_id'
11: q BINPUT 3
13: N NONE
14: U SHORT_BINSTRING '_from_id'
24: q BINPUT 4
26: J BININT 268269497
31: U SHORT_BINSTRING 'from_attribute'
47: q BINPUT 5
49: U SHORT_BINSTRING 'isReferencing'
64: q BINPUT 6
66: U SHORT_BINSTRING '__parent__'
78: q BINPUT 7
80: ( MARK
81: U SHORT_BINSTRING '\x00\x00\x00\x00\x00\x03\xfe\x1d'
91: c GLOBAL 'Products.DecisionLog.content Decision'
130: q BINPUT 8
132: t TUPLE (MARK at 80)
133: q BINPUT 9
135: Q BINPERSID
136: U SHORT_BINSTRING '_broken_to_path'
153: q BINPUT 10
155: U SHORT_BINSTRING 'foobar-2013_MIGRATION_'
186: q BINPUT 11
188: u SETITEMS (MARK at 3)
189: . STOP
highest protocol among opcodes = 1
> /sprj/st_zope_plone5/buildouts/eggs/zodbverify-1.0.2-py2.7.egg/zodbverify/verify.py(79)verify_record()
-> msg = "{}: {}".format(e.__class__.__name__, str(e))
```
The "foobar-2013_MIGRATION_" name gives a hint that this is from Products.contentmigration when migrating from 4.x to 5.0. We're now on 5.1.5. So I have the oid, how can I remove it? app._p_jar['\x00\x00\x00\x00\x00\x03\xfe\x1d'] gives a key error.
I do see this in the zc.relation catalog, but I'm unable to remove it.
>>> rel.from_path
''
>>> rel.to_path
'acrylonitrile-2013_MIGRATION_'
>>> catalog.unindex(rel)
Traceback (most recent call last):
File "<console>", line 1, in <module>
File "/sprj/st_zope_plone5/buildouts/eggs/zc.relation-1.0-py2.7.egg/zc/relation/catalog.py", line 546, in unindex
self.unindex_doc(self._relTools['dump'](rel, self, {}))
File "/sprj/st_zope_plone5/buildouts/eggs/z3c.relationfield-0.7-py2.7.egg/z3c/relationfield/index.py", line 13, in dump
return intids.getId(obj)
File "/sprj/st_zope_plone5/buildouts/eggs/five.intid-1.1.2-py2.7.egg/five/intid/intid.py", line 41, in getId
return z3IntIds.getId(self, ob)
File "/sprj/st_zope_plone5/buildouts/eggs/zope.intid-3.7.2-py2.7.egg/zope/intid/__init__.py", line 89, in getId
raise KeyError(ob)
KeyError: <z3c.relationfield.relation.RelationValue object at 0x7f79af5a1de8>
>>>