feat: add stats summary and timeseries API endpoints

cmd/query-api/main.go

@@ -209,6 +209,33 @@ func main() {
 		httpx.WriteJSON(w, http.StatusOK, map[string]any{"run": run, "spans": spans})
 	})
 
+	r.Get("/v1/stats/summary", func(w http.ResponseWriter, r *http.Request) {
+		summary, err := db.GetSummary(r.Context())
+		if err != nil {
+			httpx.WriteJSON(w, http.StatusInternalServerError, map[string]any{"error": "db_error"})
+			return
+		}
+		httpx.WriteJSON(w, http.StatusOK, summary)
+	})
+
+	r.Get("/v1/stats/timeseries", func(w http.ResponseWriter, r *http.Request) {
+		window := r.URL.Query().Get("window")
+		switch window {
+		case "1h", "6h", "24h", "7d":
+		case "":
+			window = "1h"
+		default:
+			httpx.WriteJSON(w, http.StatusBadRequest, map[string]any{"error": "invalid_window"})
+			return
+		}
+		timeseries, err := db.GetTimeseries(r.Context(), window)
+		if err != nil {
+			httpx.WriteJSON(w, http.StatusInternalServerError, map[string]any{"error": "db_error"})
+			return
+		}
+		httpx.WriteJSON(w, http.StatusOK, timeseries)
+	})
+
 	log.Printf("query-api listening on %s", addr)
 	log.Fatal(http.ListenAndServe(addr, r))
 }