Cleanup Gwibber's database to reduce CPU consumption

#!/bin/bash
# $Id: cleanup-gwibber,v 1.1 2013/04/26 15:00:20 elias Exp $
# Remove obsolete junk from gwibber's sqlite database
#
# Sorry, I do my calculations in bash syntax.
#
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#
# Configuration
# -------------
#
# Directory for Gwibber's database
#
db_dir=~/.config/gwibber
#
# Name of Gwibber's database
#
db_name=gwibber.sqlite
#
# Number of days messages should be kept in the database
#
db_keepdays=30
#
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#
# Program
# -------
#
db_path=$db_dir/$db_name
db_keepsecs=$(($db_keepdays * 24 * 60 * 60))
db_deletebefore=$((`date +%s` - $db_keepsecs))
#
sqlite3 "$db_path" <<EOF
delete from messages where time < $db_deletebefore;
vacuum;
EOF
#
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