Keep daemon logs after a button restart

CURRENT.md

@@ -40,6 +40,9 @@ mobile draft at 390px.
   - [x] C11 preview caching: Discord-hosted image/GIF previews (WebP 320px, hash-addressed, 5 MiB
     cap, one attempt) run after every walk in both modes. Live run `...-20260916090722`:
     `previewed: 2`; thumbs served over `/api/media/<scrape>/<item>/thumb` (200).
+  - [x] C41 Restart keeps its logs. A button restart spawned the replacement with `stdio: ignore`,
+    so anything after the restart vanished. The replacement now appends to `daemon.log` beside the
+    token file (`VESKSLOP_DAEMON_LOG` overrides); documented in [docs/daemon.md](docs/daemon.md).
   - [x] C40 Stale scrape states. Two `general_chut` scrapes showed `running` because the daemons
     that owned them were killed mid-job; the state file kept the last written value. On daemon
     start the engine now reconciles `running`/`queued` scrapes to `paused`, and History has a

docs/daemon.md

@@ -145,6 +145,14 @@ Core tab and the `/api/core/*` routes use it.
 Verified live on 2026-09-13: the web UI started the client under auto-Xvfb, the bridge connected,
 `state.get` returned the real account and guilds, and stop exited with code 0.
 
+## Self-restart
+
+`POST /api/daemon/restart` (Settings → Server → **Restart daemon**) replaces the daemon process
+without touching the client. The replacement detaches, so the terminal or parent shell can close.
+It appends stdout and stderr to `daemon.log` next to the token file (`poc/daemon.log` by default;
+`VESKSLOP_DAEMON_LOG` overrides). On start it pauses scrapes still marked `running` by a previous
+daemon, so a hard kill never leaves ghost jobs.
+
 ## Health endpoint
 
 `GET /health` returns the core connection state, the socket path, the owner ID, and the query count.

poc/src/control-bridge.ts

@@ -10,6 +10,7 @@
  */
 
 import { spawn } from "node:child_process";
+import { closeSync, openSync } from "node:fs";
 import { config as loadEnv } from "dotenv";
 import { createMcpExpressApp } from "@modelcontextprotocol/sdk/server/express.js";
 import { McpServer } from "@modelcontextprotocol/sdk/server/mcp.js";
@@ -1051,14 +1052,18 @@ function restartDaemon(): void {
     const args = [...process.execArgv, ...process.argv.slice(1)];
     const command = `${quote(process.execPath)} ${args.map(quote).join(" ")}`;
 
-    console.log("[daemon] restart requested: spawning a replacement");
+    const logPath = process.env.VESKSLOP_DAEMON_LOG ?? join(dirname(tokenFile), "daemon.log");
+    console.log(`[daemon] restart requested: spawning a replacement, appending to ${logPath}`);
+
+    const logFd = openSync(logPath, "a");
     const child = spawn("sh", ["-c", `sleep 2; exec ${command}`], {
         detached: true,
-        stdio: "ignore",
+        stdio: ["ignore", logFd, logFd],
         cwd: process.cwd(),
         env: { ...process.env, VESKSLOP_DAEMON_RESTART: "1" }
     });
     child.unref();
+    closeSync(logFd);
 
     setTimeout(() => shutdown(true), 300);
 }