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docs/en/guide/upgrade.md

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+# Upgrade and Maintenance
+
+## Server Upgrade
+
+Root users can check and upgrade stable Server releases from the console header. Manual binary upload is also supported.
+
+Preview releases require manual selection. Stable releases are recommended for production.
+
+## Agent Upgrade
+
+Agents follow stable releases by default. Preview upgrades must be triggered manually.
+
+The install script can be re-run for reinstall or upgrade:
+
+```bash
+curl -fsSL https://raw.githubusercontent.com/Rain-kl/OpenFlare/main/scripts/install-agent.sh | bash -s -- \
+  --server-url http://your-server:3000 \
+  --agent-token YOUR_AGENT_TOKEN
+```
+
+## Data Maintenance
+
+The settings page controls observability cleanup:
+
+| Option | Description |
+| --- | --- |
+| `DatabaseAutoCleanupEnabled` | Enable daily cleanup |
+| `DatabaseAutoCleanupRetentionDays` | Retention days, minimum 1 |
+
+When enabled, Server cleans access logs, metric snapshots, and request reports at 03:00 every day.
+
+## Validation Commands
+
+```bash
+cd openflare_server
+GOCACHE=/tmp/openflare-go-cache go test ./...
+```
+
+```bash
+cd openflare_agent
+GOCACHE=/tmp/openflare-go-cache go test ./...
+```
+
+```bash
+cd openflare_server/web
+pnpm build
+```