update

backend/main.py

@@ -4,6 +4,8 @@ scrollt je Spalte; Deltas kommen über /ws."""
 
 import asyncio
 import logging
+import subprocess
+from pathlib import Path
 
 from fastapi import FastAPI, HTTPException, WebSocket, WebSocketDisconnect
 from fastapi.middleware.cors import CORSMiddleware
@@ -16,7 +18,7 @@ import db
 import guide
 import ledger
 import pipeline
-from config import FRONTEND_DIST
+from config import FRONTEND_DIST, PROJECT_ROOT
 from ws import hub
 
 logging.basicConfig(level=logging.INFO, format="%(asctime)s %(name)s %(levelname)s %(message)s")
@@ -159,6 +161,30 @@ def health():
     return {"ok": True}
 
 
+# Themen-Transfer nur im lokalen Dev-Betrieb: der Server-Container (erkennbar an
+# /.dockerenv) hat weder ssh-Schlüssel noch das make-Gegenstück.
+_TRANSFER_LOKAL = not Path("/.dockerenv").exists()
+
+
+@app.get("/api/transfer")
+def transfer_info():
+    return {"verfuegbar": _TRANSFER_LOKAL}
+
+
+@app.post("/api/topics/{topic}/transfer/{richtung}")
+async def transfer_ausfuehren(topic: str, richtung: str):
+    if not _TRANSFER_LOKAL:
+        raise HTTPException(403, "Transfer nur lokal verfügbar")
+    if richtung not in ("push", "pull"):
+        raise HTTPException(404, "unbekannte Richtung")
+    res = await asyncio.to_thread(
+        subprocess.run, ["make", f"server-{richtung}", f"TOPIC={topic}"],
+        cwd=PROJECT_ROOT, capture_output=True, text=True, timeout=600)
+    if res.returncode:
+        raise HTTPException(500, (res.stderr or res.stdout)[-400:])
+    return {"ok": True}
+
+
 @app.get("/api/topics/{topic}/guide")
 def guide_holen(topic: str):
     # kein markdown-Feld: das Frontend rendert aus kapitel; Roh-Markdown