first commit

backend/internal/service/ops_window_stats.go

@@ -0,0 +1,24 @@
+package service
+
+import (
+	"context"
+	"time"
+
+	infraerrors "github.com/Wei-Shaw/sub2api/internal/pkg/errors"
+)
+
+// GetWindowStats returns lightweight request/token counts for the provided window.
+// It is intended for realtime sampling (e.g. WebSocket QPS push) without computing percentiles/peaks.
+func (s *OpsService) GetWindowStats(ctx context.Context, startTime, endTime time.Time) (*OpsWindowStats, error) {
+	if err := s.RequireMonitoringEnabled(ctx); err != nil {
+		return nil, err
+	}
+	if s.opsRepo == nil {
+		return nil, infraerrors.ServiceUnavailable("OPS_REPO_UNAVAILABLE", "Ops repository not available")
+	}
+	filter := &OpsDashboardFilter{
+		StartTime: startTime,
+		EndTime:   endTime,
+	}
+	return s.opsRepo.GetWindowStats(ctx, filter)
+}