diff --git a/src/servers/sidecar/music/index.ts b/src/servers/sidecar/music/index.ts
index 90917117..1f5a73df 100644
--- a/src/servers/sidecar/music/index.ts
+++ b/src/servers/sidecar/music/index.ts
@@ -74,6 +74,10 @@ const port = getFreePort();
 const server = Bun.serve({
   port,
   hostname: '127.0.0.1',
+  // A blocking /reindex (esp. the one-time full rebuild) and long range/SSE reads far outlast Bun's
+  // default 10s request idle-timeout, which would drop them mid-flight. 255s is Bun's max; a build that
+  // still outruns it completes in the background anyway (the promise isn't cancelled by a closed socket).
+  idleTimeout: 255,
   async fetch(req) {
     const url = new URL(req.url);
     const json = (data: unknown, init?: ResponseInit) =>