Just received this email notice from Etsy!thought I would post for you that have accounts.

Dear Etsy seller,
To uphold our commitment to provide you with consistent and awesome Etsy service, we're planning a database upgrade requiring a site outage on Saturday, June 16. The planned outage will begin at 7 a.m. GMT(check your local timezone), and we expect it will last no longer than a few hours. During this time, there will be no access to Etsy.com, the iPhone app, or any apps that rely on the Etsy API.
We regret that this will cause an inconvenience for some of you; that's why we chose a low-traffic time to conduct this maintenance. It's really unusual that we need to interrupt access to Etsy while we improve our technology (it's been over a year since our last planned outage), and we appreciate your patience. This upgrade allows us to launch more product improvements, and ensure a successful upcoming holiday season on Etsy.
Rest assured that all your information will remain completely secure and unaltered and Etsy will come back looking just as you left it. You can follow @EtsyStatus on Twitter for the latest news on this outage.
All the best,
Etsy