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backend/restart_backend.cmd

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+@echo off
+rem Restart backend: kill old process tree on port 8000, then start uvicorn with --reload.
+rem Log goes to repo root backend_run.log. Usage: cmd /c backend\restart_backend.cmd
+rem NOTE: keep this file ASCII only (cmd.exe reads it as GBK, UTF-8 Chinese breaks parsing).
+cd /d "%~dp0"
+
+rem uvicorn --reload spawns launcher -> reloader -> worker, and the reloader holds the :8000
+rem socket. Killing the listener with /T tears down its worker child too, and the launcher
+rem exits on its own once its child is gone -- so no orphan survives. (Git Bash: restart_backend.sh)
+for /f "tokens=5" %%a in ('netstat -ano ^| findstr /r /c:":8000 .*LISTENING"') do (
+    echo kill old PID %%a
+    taskkill /PID %%a /T /F >nul 2>&1
+)
+rem sleep ~2s (GNU timeout from Git Bash PATH shadows cmd timeout, use ping instead)
+ping -n 3 127.0.0.1 >nul
+
+rem Clear SSLKEYLOGFILE (has U+202A control chars that crash asyncpg, same as env -u)
+set "SSLKEYLOGFILE="
+
+rem redirect must live inside cmd /c - a redirect on the start line is not inherited by the child
+start "stock-backend" /min cmd /c ".venv\Scripts\python.exe -m uvicorn app.main:app --reload --port 8000 > ..\backend_run.log 2>&1"
+echo backend restarting, log: backend_run.log