Never mind, it's sorted out. After about 15 minutes, calibre returned the message "sqlite3.OperationalError: database is locked" My database in ~/library1.db is a symlink to the 'real' db on an nfs volume. Apparently my power failure left a lock file existing somewhere that I need to find and nuke. I copied the actual library1.db file to my home directory and calibre started fine.
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