added capture time for every sweep

python_app/storage/npz/snapshot_numpy.py

@@ -124,6 +124,17 @@ def save_trace_history_binary(stage_dir: Path, history: list[SweepCollection], m
                     "capture_start_ns": int(collection.capture_start_ns),
                     "capture_end_ns": int(collection.capture_end_ns),
                     "trace_count": len(collection.traces),
+                    # Also in the .bin trailer; repeated here so per-combo timing is
+                    # readable without decoding the binary payload.
+                    "traces": [
+                        {
+                            "input": int(trace.combo.input),
+                            "output": int(trace.combo.output),
+                            "capture_start_ns": int(trace.capture_start_ns),
+                            "capture_end_ns": int(trace.capture_end_ns),
+                        }
+                        for trace in collection.traces
+                    ],
                 },
                 indent=2,
             ),
@@ -182,6 +193,10 @@ def save_trace_history_numpy(
                     "input": int(trace.combo.input),
                     "output": int(trace.combo.output),
                     "points": int(freq.size),
+                    # When each combo was measured, which in a switched matrix is
+                    # spread across the collection window rather than aligned with it.
+                    "capture_start_ns": int(trace.capture_start_ns),
+                    "capture_end_ns": int(trace.capture_end_ns),
                     "freq_file": f"{tag}_freq.npy",
                     "s11_file": f"{tag}_s11.npy",
                     "s21_file": f"{tag}_s21.npy",