**Motivations:**
- Export Signet and mining wallet backups to git with only 2 versions kept
- Document and add backup/restore scripts for signet and mining wallet
**Correctifs:**
- Backup-to-git uses SSH URL for passwordless cron; copy timestamped files only; prune to 2 versions; remove *-latest from backup repo
**Evolutions:**
- data/backup-to-git-cron.sh: daily export to git.4nkweb.com/4nk/backup
- save-signet-datadir-backup.sh, restore-signet-from-backup.sh, export-mining-wallet.sh, import-mining-wallet.sh
- features/backup-to-git-daily-cron.md, docs/MAINTENANCE.md backup section
- .gitignore: data/backup-to-git.log
**Pages affectées:**
- .gitignore, data/backup-to-git-cron.sh, docs/MAINTENANCE.md, features/backup-to-git-daily-cron.md
- save-signet-datadir-backup.sh, restore-signet-from-backup.sh, export-mining-wallet.sh, import-mining-wallet.sh
- Plus autres fichiers modifiés ou non suivis déjà présents dans le working tree
**Motivations:**
- Miner stopped producing blocks after bitcoind and mempool restart
- PSBT signing failed with "PSBT signing failed" error
- descriptorprocesspsbt failed with "Argument list too long" error due to large PSBT size (1.5MB)
**Root causes:**
- descriptorprocesspsbt called via command line exceeded argument length limit when PSBT is large
- walletprocesspsbt succeeded but could not mark PSBT as complete because it cannot sign artificial signet transactions (to_spend/spend) which are not real UTXOs in wallet
- After restart, the miner needed descriptorprocesspsbt to sign artificial signet transactions, but command line approach failed
**Correctifs:**
- Modified miner to use JSON-RPC HTTP API directly for descriptorprocesspsbt instead of command line
- PSBT is now passed via HTTP request body, avoiding command line argument length limit
- Added fallback to walletprocesspsbt if HTTP RPC fails
- Updated mine.sh to use -rpcwallet and -datadir correctly for wallet operations
**Evolutions:**
- Miner now uses HTTP JSON-RPC for large PSBTs, making it more robust for signet mining with many transactions
- Improved error handling with fallback mechanisms
**Pages affectées:**
- miner: Modified PSBT signing logic to use HTTP JSON-RPC for descriptorprocesspsbt
- mine.sh: Updated to use -rpcwallet and -datadir correctly
