KeyError: 'query_href'

[ThurnerRupert <rupert.thurner@…>]

after upgrading to 0.10.1-dev we get frequently an error

Traceback (most recent call last):
  File "/usr/local/lib/python2.4/site-packages/trac/web/main.py", line 356, in dispatch_request
    dispatcher.dispatch(req)
  File "/usr/local/lib/python2.4/site-packages/trac/web/main.py", line 224, in dispatch
    resp = chosen_handler.process_request(req)
  File "/usr/local/lib/python2.4/site-packages/trac/ticket/web_ui.py", line 326, in process_request
    add_link(req, 'up', req.session['query_href'])
KeyError: 'query_href'

what could this be?

upgrade from 0.10 was done by run python setup again (without deleting the files already there).

[ThurnerRupert]

the trac database got corrupted, even if we have no idea why.

the symptom was that we could not enter session data like email address and name. doing a select showed other users rows as result. deleting these other users rows had the effect that another users rows where shown:

sqlite> select * from session_attribute where sid = 'my-id';
sid   ...   
---------------------
some  ...   ...

the following solved the problem:

$ sqlite3 wfi/db/trac.db

sqlite> PRAGMA integrity_check;
*** in database main ***
On tree page 15580 cell 62: 2nd reference to page 15574
On tree page 15580 cell 62: Child page depth differs

sqlite> vacuum;

sqlite> PRAGMA integrity_check;
ok