pruneblockchain height
Arguments:
1. height (numeric, required) The block height to prune up to. May be set to a discrete height, or to a UNIX epoch time
to prune blocks whose block time is at least 2 hours older than the provided timestamp.
Result:
n (numeric) Height of the last block pruned
Examples:
> bitcoin-cli pruneblockchain 1000
> curl --user myusername --data-binary '{"jsonrpc": "1.0", "id": "curltest", "method": "pruneblockchain", "params": [1000]}' -H 'content-type: text/plain;' http://127.0.0.1:8332/