chore: snapshot main sync

apps/control/src/services/retention.ts

@@ -141,8 +141,10 @@ export function trimCapture(captureJson: string | null, sizeKB: number): string
   if (!captureJson) return null;
   const sizeBytes = Buffer.byteLength(captureJson, 'utf8');
   if (sizeBytes <= sizeKB * 1024) return captureJson;
-  // Trim the capture to fit within the cap.
-  return captureJson.slice(0, Math.floor(sizeKB * 1024));
+  // Trim by BYTES, not JS chars: a char-index slice can split a multi-byte
+  // codepoint and emit invalid UTF-8 (DB write error / corruption). Buffer
+  // subarray + toString('utf8') truncates at the last whole codepoint.
+  return Buffer.from(captureJson, 'utf8').subarray(0, Math.floor(sizeKB * 1024)).toString('utf8');
 }
 
 /**