Support ?days=N filter on /admin/model-usage

app/main.py

@@ -1320,16 +1320,24 @@ async def admin_overview(request: Request):
 
 @app.get("/admin/model-usage")
 @limiter.limit("30/minute")
-async def admin_model_usage(request: Request):
+async def admin_model_usage(request: Request, days: int = 0):
     """Co-op-wide per-model usage from LiteLLM spend logs.
 
-    Authenticated by the X-Admin-Token header. Aggregates every spend-log row
+    Authenticated by the X-Admin-Token header. Aggregates spend-log rows
     (across ALL members) by model: total spend, tokens, and request count,
-    sorted by spend descending. No per-member breakdown — this is co-op-level
+    sorted by spend descending. Optional ?days=N limits to the last N days
+    (0 or omitted = all-time). No per-member breakdown — this is co-op-level
     so admins can see which models the membership actually uses.
     """
     _verify_admin_token(request)
 
+    cutoff = None
+    if days and days > 0:
+        from datetime import datetime, timedelta, timezone
+        cutoff = (datetime.now(timezone.utc) - timedelta(days=days)).strftime(
+            "%Y-%m-%dT%H:%M:%S"
+        )
+
     models = {}
     total_spend = 0.0
     total_tokens = 0
@@ -1350,6 +1358,10 @@ async def admin_model_usage(request: Request):
                 # 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.
+                if cutoff:
+                    started = str(row.get("startTime") or "")
+                    if started and started < cutoff:
+                        continue
                 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)