Restore saved sessions from disk on server startup

web/app.py

@@ -662,6 +662,44 @@ async def get_results(sid: str):
     }
 
 
+@app.on_event("startup")
+async def restore_sessions():
+    """Restore saved sessions from results/ on startup."""
+    results_dir = PROJECT_ROOT / "results"
+    if not results_dir.exists():
+        return
+    for d in results_dir.iterdir():
+        if not d.is_dir():
+            continue
+        raw = d / "raw_results.json"
+        cohort_file = d / "cohort.json"
+        meta_file = d / "meta.json"
+        if raw.exists() and cohort_file.exists():
+            try:
+                with open(raw) as f:
+                    eval_results = json.load(f)
+                with open(cohort_file) as f:
+                    cohort = json.load(f)
+                entity_text = ""
+                if meta_file.exists():
+                    with open(meta_file) as f:
+                        meta = json.load(f)
+                    entity_text = meta.get("entity", "")
+                sid = d.name.replace("web_", "")
+                sessions[sid] = {
+                    "id": sid,
+                    "entity_text": entity_text,
+                    "cohort": cohort,
+                    "eval_results": eval_results,
+                    "gradient": None,
+                    "created": "",
+                }
+                valid = [r for r in eval_results if isinstance(r, dict) and "score" in r]
+                print(f"  Restored session {sid}: {len(valid)} results, {len(cohort)} cohort")
+            except Exception as e:
+                print(f"  Failed to restore {d.name}: {e}")
+
+
 if __name__ == "__main__":
     import uvicorn
     print(f"\n  SGO Web Interface")