Seeing an error on a node running bitcoin v28.1.knots202503052026-02-22T08:59:28Z Checking all blk files are present...2026-02-22T08:59:32Z Initializing chainstate Chainstate [ibd] @ height -1 (null)2026-02-22T08:59:32Z Opening LevelDB in /mnt/btc/bitcoin/chainstate2026-02-22T08:59:32Z Opened LevelDB successfully2026-02-22T08:59:32Z Using obfuscation key for /mnt/btc/bitcoin/chainstate: 1d24e3daf440ae132026-02-22T08:59:32Z : Error initializing block database.Please restart with -reindex or -reindex-chainstate to recover.: Error initializing block database.Please restart with -reindex or -reindex-chainstate to recover.2026-02-22T08:59:32Z [error] Aborted block database rebuild. Exiting.2026-02-22T08:59:32Z Shutdown: In progress...2026-02-22T08:59:32Z scheduler thread exit2026-02-22T08:59:32Z Flushed fee estimates to fee_estimates.dat.2026-02-22T08:59:33Z Shutdown: doneA reboot happened before this was first seenFeb 21 13:08:44 btc bitcoind[1026]: 2026-02-21T13:08:44Z New outbound-full-relay v1 peer connected: version: 70016, blocks=937663, peer=33Feb 21 13:09:04 btc bitcoind[1026]: 2026-02-21T13:09:04Z New outbound-full-relay v2 peer connected: version: 70016, blocks=937663, peer=35-- Reboot --Feb 21 14:29:48 btc systemd[1]: Started bitcoin.Feb 21 14:29:50 btc bitcoind[1007]: 2026-02-21T14:29:50Z Bitcoin Knots version v28.1.knots20250305 (release build)What is the cause of this error?Is there a way to prevent this?