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Implementation notes
metas
) which collects ids of staged images by time of addition.Cleanup
takes a range from some old date tillnow - TTL
and removes referenced images. This particular approach was chosen because of bolt limitation of only a single read-write transaction. Interval between cleanups might be pretty long (depends on configuration) therefore it might be possible to have quite a big list of staged images, so objective was to avoid iterating over entire list of staged images.