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user_id=4923

It's using gdbm.

There's a problem here, but I screwed up and it's not as
described.
The 1st commit worked, the second fails with "resource
temporarily unavailable" on nodes.keyword. In fact,
nodes.keyword seems now to be permanently unavailable
(except for reading).

I'll close this and open a new one when I figure out what's
really going on.