Hey Mark,
This is Ani, I read your blogpost on play app signing and decided to be a member here. I also attended your session on App security android dev summit.

I have SQLITE/Room related question.
In my app, I have many records, with potential of several thousands of them, stored in sqlite3.
The data is simple in itself, say _id (primary key, auto increment), _data (text, non null).
My question is, I want to sort the data on the basis of last updated item, say the recently updated items should come before the others.
I can manually enter the updated timestamp in sqlite, but wanted to avoid being in that situation for the following reasons:
1. I wanted to explore is there is any such support in sqlite. SO far I didn’t find it.
2. To avoid user resetting clock/timezone issues and what not, I wanted to resort to something more like Logical timestamp than actual time stamp.
Do you have any suggestions on how to go about it?
On top of it, since we are on a  mobile device, I dont want to fetch every record there is on the device, rather I want to be able to paginate.
If I pick option 2, I can then say:

First page : Select * from data_table where LOGICAL_TIMESTAMP > 0 LIMIT 25
Second page : Select * from data_table where LOGICAL_TIMESTAMP > {logical timestamp of last entry in previous query’s result} LIMIT 25

Logical timestamp: I meant something along the lines of Lamport Timestamp
Increment timestamp on every event..

about your point `for data in a database, we normally think of the data having lifetimes measured in days/weeks/months/years, so we cannot use something like SystemClock.elapsedRealtime()`
Can you please elaborate a little?