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docs: add node role constraint to backup design spec

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root 2026-04-26 18:55:04 +08:00
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docs/superpowers/specs/2026-04-26-database-backup-snapshot-design.md
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@ -19,6 +19,16 @@ Add backup, scheduled snapshot, export (download), and restore functionality for
- Backup retention policy (keep last N backups)
- Existing `getDb`/`importDB` endpoints remain unchanged for SQLite raw .db file operations
## Node Role Constraint
In MariaDB multi-node mode, the database is shared. Backup and restore operations are restricted to the **master node only**:
- Worker nodes: backup/restore endpoints and CLI commands return an error: "Backup and restore can only be performed on the master node"
- Panel UI on worker nodes: backup tab is hidden or disabled with the above message
- x-ui.sh on worker nodes: `backup`/`restore`/`list-backups` commands show the restriction message
- SQLite mode: no restriction (SQLite is always single-node)
- Node role is read from the JSON config (`nodeRole`: `"master"` or `"worker"`)
## Architecture
### New Files
@ -217,6 +227,7 @@ New items after existing 1-16:
## Error Handling
- Worker node attempts backup/restore → reject: "Backup and restore can only be performed on the master node"
- `mysqldump` or `sqlite3` not found on system → clear error message with install instructions
- Disk full → reject backup, notify user
- Backup file corrupted (invalid tar.gz or missing metadata.json) → reject restore