Synchronizing database query with update notifications via AQ

I am building a financial system and want to keep all my reference data in the database.
If one user updates a piece of data, I need all users that use that data to be notified of the change.
I know I can do this using triggers and publish-subscribe, but I have a synchronization problem:
A client comes up, queries initial value via select, then (or before) subscribe to updates.
Since the AQ channel is seperate from the regulal DB connection, I do not know if I missed an update notification that happened just after I queried, but before my subscription came into effect, or I might even get an update that is older then my query.
I know I can add sequance numbers to all updates, and force an initial update each time a new client connects, but that is both slow and complex.
Can anybody think of a simple way to have a database query synchronized with updates?

A query with different syntax would result in a different hash value.
Stored outlines work based on hash value.
Your question is probably answered now.
Sybrand Bakker
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The Link I gave you above won't tweak Firefox but rather give you a brief overview on what's new in Firefox 29.
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Synchronizing database query with update notifications via AQ

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