[amibroker] Data Plugin / Preserve Database

["Sachin" <sachin_13@xxxxxxxxx>]

How to make AB preserve a database for a streaming real time source
which does not support backfill/hist. data from the remote server and
depends on the current price to build the database and is updated
using ::SendMessage(ParentWn,WM_USER_STREAMING_UPDATE... -> GetQuotes
Mechanism and not the Timer mechanism ?

When writing a RT data plugin nLastValid always is -1 when GetQuotes
is called for the first time so automatically on startup the previous
quotes are deleted

also

when the timer event fires periodically ( Preferences -> Intraday -> 
Realtime chart refresh ) again GetQuotes is called with the value of
nLastValid as -1. 












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