Prefer model_group alias in model-usage aggregation

app/main.py

@@ -1345,7 +1345,12 @@ async def admin_model_usage(request: Request):
             if isinstance(rows, dict):
                 rows = rows.get("data", rows.get("logs", []))
             for row in rows if isinstance(rows, list) else []:
-                model = row.get("model") or row.get("model_group") or "unknown"
+                # Prefer model_group: it carries our provider/model alias (e.g.
+                # greenpt/green-r, publicai/apertus-v1.5-8b) when present; the
+                # raw `model` field holds messy upstream/internal names. Older
+                # rows predating the alias convention have model_group empty,
+                # so fall back to `model` for those.
+                model = row.get("model_group") or row.get("model") or "unknown"
                 m = models.setdefault(model, {"spend": 0.0, "tokens": 0, "requests": 0})
                 m["spend"] += float(row.get("spend") or 0.0)
                 m["tokens"] += int(row.get("total_tokens") or 0)