Automatische DB-Backups: nächtlich, gzip, Rotation, optional Discord-Upload

- SQLite-Online-Backup (WAL-sicher) täglich 03:00 → data/backups/*.db.gz, 14 Tage Rotation
- Optional Offsite-Kopie als Upload in einen privaten Discord-Kanal (Setting)
- Setup-Seite: Toggle, Upload-Kanal, 'Backup jetzt'-Button; letztes Backup im Status-Panel

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/web/api.js

@@ -147,6 +147,8 @@ ${rssItems}
             watchdog_urls: getSetting('watchdog_urls') ?? '',
             public_url: publicUrl(),
             gitea_url: getSetting('gitea_url') ?? config.giteaUrl,
+            backup_enabled: getSetting('backup_enabled') !== '0',
+            backup_channel_id: getSetting('backup_channel_id') ?? '',
         };
     }
 
@@ -163,6 +165,7 @@ ${rssItems}
                 uptimeSeconds: Math.floor(process.uptime()),
                 guilds: client.guilds.cache.size,
                 giteaTokenConfigured: Boolean(config.giteaApiToken),
+                lastBackup: getSetting('last_backup'),
                 ...stats,
             },
         };
@@ -173,11 +176,11 @@ ${rssItems}
 
         const body = request.body ?? {};
 
-        // Kanäle: müssen existierende Textkanäle sein (release darf leer sein = deaktiviert)
-        for (const key of ['commit_channel_id', 'devlog_channel_id', 'release_channel_id']) {
+        // Kanäle: müssen existierende Textkanäle sein (release/backup dürfen leer sein = aus)
+        for (const key of ['commit_channel_id', 'devlog_channel_id', 'release_channel_id', 'backup_channel_id']) {
             if (body[key] === undefined) continue;
             const value = String(body[key]);
-            if (value === '' && key === 'release_channel_id') {
+            if (value === '' && ['release_channel_id', 'backup_channel_id'].includes(key)) {
                 setSetting(key, '');
                 continue;
             }
@@ -209,6 +212,9 @@ ${rssItems}
         if (body.devlog_threads_enabled !== undefined) {
             setSetting('devlog_threads_enabled', body.devlog_threads_enabled ? '1' : '0');
         }
+        if (body.backup_enabled !== undefined) {
+            setSetting('backup_enabled', body.backup_enabled ? '1' : '0');
+        }
         for (const key of ['commit_branch_filter', 'ignored_repos', 'bug_report_repo', 'watchdog_urls']) {
             if (body[key] !== undefined) {
                 setSetting(key, String(body[key]).trim());
@@ -275,6 +281,18 @@ ${rssItems}
                 return reply.code(502).send({ error: 'Senden fehlgeschlagen' });
             }
         }
+
+        // Sonderfall: Backup sofort erstellen
+        if (target === 'backup') {
+            try {
+                const { runBackup } = await import('../backup.js');
+                const result = await runBackup(client);
+                return { ok: true, sizeBytes: result.sizeBytes };
+            } catch (error) {
+                request.log.error({ err: error }, 'Backup-Test fehlgeschlagen');
+                return reply.code(502).send({ error: 'Backup fehlgeschlagen' });
+            }
+        }
         const channelId =
             target === 'commit' ? commitChannelId()
             : target === 'devlog' ? devlogChannelId()