remove archive index sqlite connection pool for simplicity #2274
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Coming from #2273 (comment), I saw that creating the sqlite connection does make a 10x difference (8µs vs 80µs), but since these are _micro_seconds I think we can simplify our code by doing this.
Like this we can manually copy / delete / fix cached archive index files and will directly see the effect. Also this will reduce the number of threads & open files, though that doesn't matter much.
We will still have the issue of the actual cached index files being outdated when the rebuild is done by the second builder, or when we will have multiple webservers.