Is possible such thing:?two columns: first is bitcoin address, second is index 1,2,3..(0 is reserved for no_found)
map address->index:we get row with address and have index; if not found address we add new row with index computed by:
- max (index)+1 or -size table +1 If possible fast read this?
And backward: we have index and we must get row with index. Is something like "natural index" = 0,1,2,3.... ?
