Can LR store samll thumbnails in database or somewhere to have better DAM functions?

I notice that thumbnails is using data in standard preview cache,
so standard preview cache will be very big because for default setup one raw file need around 1.3M, so 10000 photos needs 13G, take too much harddisk space.
If preview cache is deleted and RAW files is archived offline, we will not see thumbnails for the archived raw files (lost files) any more.
we have problems to use LR as DAM tools.
So I like to suggest that
1. LR should store a reasonable size thumbnails in catalog data base or somewhere to let user to import into main catalog or backup easily.
2. Standard view cache also can be discard to save disk space.
3. Have archived mark and linkage info ( Hard disk or DVD volume ) to let user mount related raw files easily.
4. one RAW file with different names should be treated as one file with one record in catalog to solve the rename issue. I think it can be done as in C1, the system use same work file(adjustment data) for raw file with different names.
any comment from your guys?

thanks, jay.
hehe, we may retain thumbnail-cache.db and delete the rest.
BTW, I think it is better to keep in the main directory and have the option to do backup and integrity test.

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