Installed 3.0.6 beta APK as soon as I got it. Something interesting happened when I used the clean DB function for the first time.
I have 0.99GB free space on the internal app storage, as reported by Android. CC database has 9517 books total in it. Cleaning the database took ~8 minutes: I started at 1614 hours, and finished at 1621 hours, close to 1622 hours.
I took note of CC's vital stats before installing 3.0.6:
CC Data size on 3.0.5:
Storage
Total: 175MB
App: 1.44MB
USB storage app: 4.09MB
Data: 169MB
Installed 3.0.6, checked again to make sure nothing else changed. As expected, nothing changed.
On 3.0.6 before cleaning DB:
Total: 175MB
App: 1.44 MB
USB storage app: 4.09MB
Data: 169 MB
Clean started 1614, ended 1621: Cleaning time ~8 minutes
After cleaning:
Total: 269MB
App: 1.44MB
USB storage app: 4.09MB
Data: 263 MB
What? I noticed that after the cleaning, CC also became sluggish, then unresponsive when I tried to use it to browse my collection-- it did that a few times, before finally stopping. My device also stalled, several background apps reporting they'd stopped. I decided to reboot to see if things made a difference.
After reboot, looking again at CC stats:
Total: 164MB
App: 1.44MB
USB storage app: 4.09 MB
Data: 159MB
It may be that rebooting the device is a good idea after cleaning. Going to try that again before sending any new books over tonight.