Comment 18 for bug 897469

you are right:

nailor@needle:~$ ls -lah ~/.cache/simple-scan/autosaves/autosaves.db
-rw-r--r-- 1 nailor nailor 113M Aug 14 17:53 /home/nailor/.cache/simple-scan/autosaves/autosaves.db

nailor@needle:~$ sqlite3 ~/.cache/simple-scan/autosaves/autosaves.db
SQLite version 3.7.9 2011-11-01 00:52:41
Enter ".help" for instructions
Enter SQL statements terminated with a ";"
sqlite> select count(*) from pages;
0
sqlite> .quit

nailor@needle:~$ ls -lah ~/.cache/simple-scan/autosaves/autosaves.db
-rw-r--r-- 1 nailor nailor 113M Aug 14 17:53 /home/nailor/.cache/simple-scan/autosaves/autosaves.db

nailor@needle:~$ sqlite3 ~/.cache/simple-scan/autosaves/autosaves.db
SQLite version 3.7.9 2011-11-01 00:52:41
Enter ".help" for instructions
Enter SQL statements terminated with a ";"
sqlite> VACUUM;
sqlite> .quit

nailor@needle:~$ ls -lah ~/.cache/simple-scan/autosaves/autosaves.db
-rw-r--r-- 1 nailor nailor 2,0K Aug 14 19:12 /home/nailor/.cache/simple-scan/autosaves/autosaves.db