[YouTube-API] query with DEVELOPER_TAG_SCHEME after uploaded

after video is uploaded. how many hours need to wait until can do
query with DEVELOPER_TAG_SCHEME to get the result?

question 1:
I need advice, should i keep records of each files uploaded into
youtube or just do query with DEVELOPER_TAG_SCHEME to get all videos ?
which is better? if i do the prior technique. what if the video is
deleted by youtube. i think the latter will only display result of
viewable video DEVELOPER_TAG_SCHEME.

question 2:
can i use unlimited different DEVELOPER_TAG_SCHEME for each page to
identified video upload through each page?

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