[CHIA-1927] add tool to roll-back a blockchain database file to a previous height

[arvidn]

if --rollback is not specified, prints the peak height and hash.

If --rollback is specified with a height lower than the current peak, the database is updated like this:

• the peak is updated to point to the block at the specified height
• all blocks with a height greater than the new peak are marked as in_main_chain=0
• all coins created after the new peak are deleted from the coin_records table
• all coins spent after the new peak are marked as unspent

Example use:

cargo run --release --bin rollback-blockchain-db -- --rollback 6255740 ~/.chia/mainnet/db/blockchain_v2_mainnet.sqlite

Example output:

opening blockchain database file: /home/arvid/.chia/mainnet/db/blockchain_v2_mainnet.sqlite
peak height: 6267502
peak hash: 9fb57e29c398ffa69895d31a81af033e7a10cbf37625dcecd52307dfbefaa467
Rolling back to height 6255740
updating new peak to 9fb57e29c398ffa69895d31a81af033e7a10cbf37625dcecd52307dfbefaa467
clearing in_main_chain for all blocks with height above 6255740
deleting all coins created after height 6255740
unspending all coins spent after height 6255740

[coveralls-official]

Pull Request Test Coverage Report for Build 12084580048

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 84.054%

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Totals
Change from base Build 12070655746:	0.0%
Covered Lines:	13004
Relevant Lines:	15471

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💛 - Coveralls

[AmineKhaldi]

Is there anything preventing us from having these queries as part of a chia db command (chia db rollback for example) so that it can conveniently benefit the community right from the chia-blockchain repo?

[arvidn]

Is there anything preventing us from having these queries as part of a chia db command (chia db rollback for example) so that it can conveniently benefit the community right from the chia-blockchain repo?

It would be more work and I don't think it's a priority. the community can use this tool too