++

backend/app/main.py

@@ -5,7 +5,7 @@ import os
 from contextlib import asynccontextmanager
 from pathlib import Path
 
-from fastapi import FastAPI
+from fastapi import FastAPI, Request
 from fastapi.middleware.cors import CORSMiddleware
 from fastapi.staticfiles import StaticFiles
 from fastapi.responses import FileResponse
@@ -23,6 +23,7 @@ from app.services.research import ResearchService
 from app.services.gossip import GossipEngine
 from app.services.life_engine import LifeEngine
 from app.services.forecast import ForecastService
+from app.services.i18n import parse_accept_language
 from app.api.simulate import router as simulate_router
 from app.api.agents import router as agents_router
 from app.api.gallery import router as gallery_router
@@ -40,6 +41,17 @@ async def lifespan(app: FastAPI):
     store = SimulationStore(settings.database_dir)
     await store.init()
 
+    # Sweep up any simulations that were "running" when the previous process
+    # died — without this they'd stay stuck in `running` forever and clients
+    # polling /report would never see a terminal status. We mark them
+    # `interrupted` so the API can surface a clear error.
+    try:
+        interrupted = await store.sweep_orphan_running_sims()
+        if interrupted:
+            logger.warning("Marked %d orphan simulations as interrupted", interrupted)
+    except Exception as e:  # pragma: no cover - best effort
+        logger.warning("Orphan sweep failed: %s", e)
+
     llm = LLMClient(
         api_key=settings.llm_api_key,
         base_url=settings.llm_base_url,
@@ -86,6 +98,15 @@ app.add_middleware(
     allow_headers=["*"],
 )
 
+
+@app.middleware("http")
+async def locale_middleware(request: Request, call_next):
+    """Resolve Accept-Language once per request and stash it for handlers."""
+    request.state.locale = parse_accept_language(request.headers.get("accept-language"))
+    response = await call_next(request)
+    response.headers.setdefault("Content-Language", request.state.locale)
+    return response
+
 app.include_router(simulate_router)
 app.include_router(agents_router)
 app.include_router(gallery_router)