Akonadi-db-migrator fails

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Hi,
for a long time I’ve been running akonadi with postgres as a backend, now I’m finally taking the time to migrate to sqlite. However, akonadi-db-migrator --newengine sqlite fails.

log snippet:

org.kde.pim.akonadiserver:   Error code: "42703"
org.kde.pim.akonadiserver:   DB error:  "ERROR:  column \"pimitemflagrelation\" of relation \"pimitemflagrelation\" does not exist\nLINE 1: ...E qpsqlpstmt_1f AS UPDATE PimItemFlagRelation SET PimItemFla...\n                                                             ^\nHINT:  SET target columns cannot be qualified with the relation name.\n(42703)"

Full log in pastebin:

Any ideas? Thanks.