diff --git a/.buildkite/test-nightly.yml b/.buildkite/test-nightly.yml
index ac43b597d..02d8cced4 100644
--- a/.buildkite/test-nightly.yml
+++ b/.buildkite/test-nightly.yml
@@ -110,8 +110,12 @@ steps:
         timeout_in_minutes: 180
         commands:
           - export BENCHMARK_DIR=tests/dfx/perf/results
-          - pytest -s -v tests/dfx/perf/scripts/run_benchmark.py --test-config-file tests/dfx/perf/tests/test_qwen_omni.json
-          - buildkite-agent artifact upload "tests/dfx/perf/results/*.json"
+          - |
+            set +e
+            pytest -s -v tests/dfx/perf/scripts/run_benchmark.py --test-config-file tests/dfx/perf/tests/test_qwen_omni.json
+            EXIT=$$?
+            buildkite-agent artifact upload "tests/dfx/perf/results/*.json"
+            exit $$EXIT
         agents:
           queue: "mithril-h100-pool"
         plugins:
@@ -177,8 +181,12 @@ steps:
         commands:
           - export BENCHMARK_DIR=tests/dfx/perf/results
           - export VLLM_ALLOW_LONG_MAX_MODEL_LEN="1"
-          - pytest -s -v tests/dfx/perf/scripts/run_benchmark.py --test-config-file tests/dfx/perf/tests/test_tts.json
-          - buildkite-agent artifact upload "tests/dfx/perf/results/*.json"
+          - |
+            set +e
+            pytest -s -v tests/dfx/perf/scripts/run_benchmark.py --test-config-file tests/dfx/perf/tests/test_tts.json
+            EXIT=$$?
+            buildkite-agent artifact upload "tests/dfx/perf/results/*.json"
+            exit $$EXIT
         agents:
           queue: "mithril-h100-pool"
         plugins:
@@ -398,6 +406,46 @@ steps:
                       path: /mnt/hf-cache
                       type: DirectoryOrCreate
 
+      - label: ":full_moon: Diffusion X2I(&A&T) · Accuracy Test"
+        timeout_in_minutes: 180
+        commands:
+          - pytest -s -v tests/e2e/accuracy/test_qwen_image*.py --run-level advanced_model
+        agents:
+          queue: "mithril-h100-pool"
+        plugins:
+          - kubernetes:
+              podSpec:
+                containers:
+                  - image: 936637512419.dkr.ecr.us-west-2.amazonaws.com/vllm-ci-pull-through-cache/q9t5s3a7/vllm-ci-test-repo:$BUILDKITE_COMMIT
+                    resources:
+                      limits:
+                        nvidia.com/gpu: 1
+                    volumeMounts:
+                      - name: devshm
+                        mountPath: /dev/shm
+                      - name: hf-cache
+                        mountPath: /root/.cache/huggingface
+                    env:
+                      - name: HF_HOME
+                        value: /root/.cache/huggingface
+                      - name: VLLM_HTTP_TIMEOUT_KEEP_ALIVE
+                        value: "120"
+                      - name: HF_TOKEN
+                        valueFrom:
+                          secretKeyRef:
+                            name: hf-token-secret
+                            key: token
+                nodeSelector:
+                  node.kubernetes.io/instance-type: gpu-h100-sxm
+                volumes:
+                  - name: devshm
+                    emptyDir:
+                      medium: Memory
+                  - name: hf-cache
+                    hostPath:
+                      path: /mnt/hf-cache
+                      type: DirectoryOrCreate
+
       - label: ":full_moon: Diffusion X2I(&A&T) · Perf Test"
         key: nightly-diffusion-x2iat-performance
         timeout_in_minutes: 180
@@ -417,11 +465,9 @@ steps:
             EXIT3=$$?
             pytest -s -v tests/dfx/perf/scripts/run_diffusion_benchmark.py --test-config-file tests/dfx/perf/tests/test_qwen_image_layered_vllm_omni.json
             EXIT4=$$?
-            if [ $$EXIT1 -eq 0 ] || [ $$EXIT2 -eq 0 ] || [ $$EXIT3 -eq 0 ] || [ $$EXIT4 -eq 0 ]; then
-              buildkite-agent artifact upload "tests/dfx/perf/results/diffusion_result_*.json"
-              buildkite-agent artifact upload "tests/dfx/perf/results/logs/*.log"
-            fi
-            exit $$((EXIT1 | EXIT2 | EXIT3))
+            buildkite-agent artifact upload "tests/dfx/perf/results/diffusion_result_*.json"
+            buildkite-agent artifact upload "tests/dfx/perf/results/logs/*.log"
+            exit $$((EXIT1 | EXIT2 | EXIT3 | EXIT4))
         agents:
           queue: "mithril-h100-pool"
         plugins:
diff --git a/tests/dfx/perf/scripts/diffusion_result_template.json b/tests/dfx/perf/scripts/diffusion_result_template.json
new file mode 100644
index 000000000..86bdf1bc7
--- /dev/null
+++ b/tests/dfx/perf/scripts/diffusion_result_template.json
@@ -0,0 +1,86 @@
+[
+  {
+    "test_name": null,
+    "backend": null,
+    "timestamp": null,
+    "server_params": {
+      "model": null,
+      "serve_args": {
+        "enable-diffusion-pipeline-profiler": false
+      }
+    },
+    "benchmark_params": {
+      "name": null,
+      "dataset": null,
+      "task": null,
+      "width": 0,
+      "height": 0,
+      "num-inference-steps": 0,
+      "num-prompts": 0,
+      "max-concurrency": 0,
+      "num-input-images": 0,
+      "enable-negative-prompt": false,
+      "baseline": {
+        "throughput_qps": 0,
+        "latency_mean": 0,
+        "peak_memory_mb_max": 0,
+        "peak_memory_mb_mean": 0
+      }
+    },
+    "result": {
+      "duration": 0,
+      "completed_requests": 0,
+      "failed_requests": 0,
+      "throughput_qps": 0,
+      "latency_mean": 0,
+      "latency_median": 0,
+      "latency_p99": 0,
+      "latency_p95": 0,
+      "latency_p50": 0,
+      "peak_memory_mb_max": 0,
+      "peak_memory_mb_mean": 0,
+      "peak_memory_mb_median": 0,
+      "stage_durations_mean": {},
+      "stage_durations_p50": {},
+      "stage_durations_p99": {},
+      "backend": null,
+      "model": null,
+      "dataset": null,
+      "task": null
+    },
+    "log_file": null,
+    "Model": null,
+    "Framework": null,
+    "Hardware": null,
+    "Deployment": null,
+    "Task": null,
+    "Dataset": null,
+    "resolution": null,
+    "Parallelism": null,
+    "max_concurrency": 0,
+    "Cache": null,
+    "Quantization": null,
+    "offload": null,
+    "compile": null,
+    "Attn_backend": null,
+    "num_inference_steps": 0,
+    "completed": 0,
+    "failed": 0,
+    "throughput_qps": 0,
+    "latency_mean": 0,
+    "latency_median": 0,
+    "latency_p99": 0,
+    "latency_p95": 0,
+    "latency_p50": 0,
+    "peak_memory_mb_max": 0,
+    "peak_memory_mb_mean": 0,
+    "peak_memory_mb_median": 0,
+    "stage_durations_mean": {},
+    "stage_durations_p50": {},
+    "stage_durations_p99": {},
+    "commit_sha": null,
+    "build_id": null,
+    "build_url": null,
+    "source_file": null
+  }
+]
diff --git a/tests/dfx/perf/scripts/result_omni_template.json b/tests/dfx/perf/scripts/result_omni_template.json
new file mode 100644
index 000000000..1d6132140
--- /dev/null
+++ b/tests/dfx/perf/scripts/result_omni_template.json
@@ -0,0 +1,55 @@
+{
+  "date": null,
+  "endpoint_type": null,
+  "backend": null,
+  "label": null,
+  "model_id": null,
+  "tokenizer_id": null,
+  "num_prompts": 0,
+  "request_rate": null,
+  "burstiness": 0,
+  "max_concurrency": 0,
+  "duration": 0,
+  "completed": 0,
+  "failed": 0,
+  "total_input_tokens": 0,
+  "total_output_tokens": 0,
+  "request_throughput": 0,
+  "request_goodput": null,
+  "output_throughput": 0,
+  "total_token_throughput": 0,
+  "total_audio_duration_s": 0,
+  "total_audio_frames": 0,
+  "audio_throughput": 0,
+  "max_output_tokens_per_s": 0,
+  "max_concurrent_requests": 0,
+  "rtfx": 0,
+  "mean_ttft_ms": 0,
+  "median_ttft_ms": 0,
+  "p99_ttft_ms": 0,
+  "mean_tpot_ms": 0,
+  "median_tpot_ms": 0,
+  "p99_tpot_ms": 0,
+  "mean_itl_ms": 0,
+  "median_itl_ms": 0,
+  "p99_itl_ms": 0,
+  "mean_e2el_ms": 0,
+  "median_e2el_ms": 0,
+  "p99_e2el_ms": 0,
+  "mean_audio_rtf": 0,
+  "median_audio_rtf": 0,
+  "p99_audio_rtf": 0,
+  "mean_audio_ttfp_ms": 0,
+  "median_audio_ttfp_ms": 0,
+  "p99_audio_ttfp_ms": 0,
+  "mean_audio_duration_s": 0,
+  "median_audio_duration_s": 0,
+  "p99_audio_duration_s": 0,
+  "baseline": {
+    "mean_ttft_ms": 0,
+    "mean_audio_ttfp_ms": 0,
+    "mean_audio_rtf": 0
+  },
+  "random_input_len": 0,
+  "random_output_len": 0
+}
diff --git a/tests/dfx/perf/scripts/run_benchmark.py b/tests/dfx/perf/scripts/run_benchmark.py
index d5ef1b49e..bea46f684 100644
--- a/tests/dfx/perf/scripts/run_benchmark.py
+++ b/tests/dfx/perf/scripts/run_benchmark.py
@@ -45,6 +45,8 @@ if CONFIG_FILE_PATH is None:
     CONFIG_FILE_PATH = _DEFAULT_CONFIG_FILE
 
 BENCHMARK_CONFIGS = load_configs(CONFIG_FILE_PATH)
+OMNI_RESULT_TEMPLATE_PATH = Path(__file__).parent / "result_omni_template.json"
+
 
 STAGE_CONFIGS_DIR = Path(__file__).parent.parent / "stage_configs"
 test_params = create_unique_server_params(BENCHMARK_CONFIGS, STAGE_CONFIGS_DIR)
@@ -64,7 +66,7 @@ def omni_server(request):
 
         print(f"Starting OmniServer with test: {test_name}, model: {model}")
 
-        server_args = ["--stage-init-timeout", "300", "--init-timeout", "900"]
+        server_args = ["--stage-init-timeout", "600", "--init-timeout", "900"]
         if stage_config_path:
             server_args = ["--stage-configs-path", stage_config_path] + server_args
         with OmniServer(model, server_args) as server:
@@ -141,8 +143,17 @@ def run_benchmark(
         result_dir = "./"
 
     result_path = os.path.join(result_dir, result_filename)
-    with open(result_path, encoding="utf-8") as f:
-        result = json.load(f)
+    if not os.path.exists(result_path):
+        with open(OMNI_RESULT_TEMPLATE_PATH, encoding="utf-8") as f:
+            template_result: dict[str, Any] = json.load(f)
+        Path(result_path).parent.mkdir(parents=True, exist_ok=True)
+        with open(result_path, "w", encoding="utf-8") as f:
+            json.dump(template_result, f, ensure_ascii=False, indent=2)
+        print(f"Benchmark result file not generated, fallback to template: {result_path}")
+        result = template_result
+    else:
+        with open(result_path, encoding="utf-8") as f:
+            result = json.load(f)
 
     if baseline_config:
         result["baseline"] = _baseline_thresholds_for_step(
diff --git a/tests/dfx/perf/scripts/run_diffusion_benchmark.py b/tests/dfx/perf/scripts/run_diffusion_benchmark.py
index 8eeeec8df..23efa8bb0 100644
--- a/tests/dfx/perf/scripts/run_diffusion_benchmark.py
+++ b/tests/dfx/perf/scripts/run_diffusion_benchmark.py
@@ -52,6 +52,7 @@ BENCHMARK_SCRIPT = str(
 _SESSION_TIMESTAMP = datetime.now().strftime("%Y%m%d-%H%M%S")
 _RESULT_LOCK = threading.Lock()
 _BRANCHPOINT_COMMIT_SHA: str | None = None
+DIFFUSION_RESULT_TEMPLATE_PATH = Path(__file__).parent / "diffusion_result_template.json"
 
 
 def _get_config_file_from_argv() -> str | None:
@@ -563,10 +564,17 @@ def run_benchmark(
 
     if process.returncode != 0:
         tmp_result_file.unlink(missing_ok=True)
-        raise RuntimeError(f"Benchmark script exited with code {process.returncode}")
+        print(f"ERROR:Benchmark script exited with code {process.returncode}")
 
     if not tmp_result_file.exists():
-        raise FileNotFoundError(f"Benchmark result file not found: {tmp_result_file}")
+        with open(DIFFUSION_RESULT_TEMPLATE_PATH, encoding="utf-8") as f:
+            template_payload = json.load(f)
+        # Template schema is fixed and owned by this repo:
+        # ``diffusion_result_template.json`` is a one-item list and metrics live at [0]["result"].
+        template_metrics: dict[str, Any] = template_payload[0]["result"]
+        with open(tmp_result_file, "w", encoding="utf-8") as f:
+            json.dump(template_metrics, f, ensure_ascii=False, indent=2)
+        print(f"Benchmark result file not generated, fallback to template: {tmp_result_file}")
 
     try:
         with open(tmp_result_file, encoding="utf-8") as f:
diff --git a/tests/test_generate_nightly_perf_excel.py b/tests/test_generate_nightly_perf_excel.py
new file mode 100644
index 000000000..9b05d6de0
--- /dev/null
+++ b/tests/test_generate_nightly_perf_excel.py
@@ -0,0 +1,71 @@
+import importlib.util
+import json
+import sys
+from pathlib import Path
+
+import pytest
+from openpyxl import load_workbook
+
+pytestmark = [pytest.mark.core_model, pytest.mark.cpu]
+
+
+def _load_excel_module():
+    repo_root = Path(__file__).resolve().parents[1]
+    module_path = repo_root / "tools" / "nightly" / "generate_nightly_perf_excel.py"
+    spec = importlib.util.spec_from_file_location("generate_nightly_perf_excel", module_path)
+    module = importlib.util.module_from_spec(spec)
+    sys.modules[spec.name] = module
+    spec.loader.exec_module(module)
+    return module
+
+
+def _cell_value_by_header(ws, header_name: str, row_idx: int = 2):
+    headers = [c.value for c in ws[1]]
+    col_idx = headers.index(header_name) + 1
+    return ws.cell(row=row_idx, column=col_idx).value
+
+
+def test_generate_excel_report_with_perf_templates(tmp_path: Path):
+    module = _load_excel_module()
+    repo_root = Path(__file__).resolve().parents[1]
+    perf_scripts_dir = repo_root / "tests" / "dfx" / "perf" / "scripts"
+
+    omni_template_path = perf_scripts_dir / "result_omni_template.json"
+    diffusion_template_path = perf_scripts_dir / "diffusion_result_template.json"
+
+    omni_record = json.loads(omni_template_path.read_text(encoding="utf-8"))
+    diffusion_records = json.loads(diffusion_template_path.read_text(encoding="utf-8"))
+
+    input_dir = tmp_path / "input"
+    diffusion_input_dir = tmp_path / "diffusion_input"
+    input_dir.mkdir()
+    diffusion_input_dir.mkdir()
+
+    # Keep file names compatible with parser conventions in generate_nightly_perf_excel.py
+    omni_result_file = input_dir / "result_test_perf_random_1_4_in2500_out900_20260415-185642.json"
+    diffusion_result_file = diffusion_input_dir / "diffusion_result_qwen_image_edit_20260415-193200.json"
+    omni_result_file.write_text(json.dumps(omni_record, ensure_ascii=False, indent=2), encoding="utf-8")
+    diffusion_result_file.write_text(json.dumps(diffusion_records, ensure_ascii=False, indent=2), encoding="utf-8")
+
+    output_file = tmp_path / "nightly_perf.xlsx"
+    module.generate_excel_report(
+        input_dir=str(input_dir),
+        diffusion_input_dir=str(diffusion_input_dir),
+        output_file=str(output_file),
+        commit_sha="test_commit_sha",
+        build_id="test_build_id",
+        build_url="https://example.com/build/123",
+    )
+
+    assert output_file.exists()
+
+    wb = load_workbook(output_file)
+    assert set(wb.sheetnames) >= {"omni_summary", "diffusion_summary", "omni_raw", "diffusion_raw"}
+
+    ws_omni_raw = wb["omni_raw"]
+    baseline_cell = _cell_value_by_header(ws_omni_raw, "baseline")
+    assert baseline_cell == json.dumps(omni_record["baseline"], ensure_ascii=False, sort_keys=True)
+
+    ws_omni_summary = wb["omni_summary"]
+    assert _cell_value_by_header(ws_omni_summary, "commit_sha") == "test_commit_sha"
+    assert _cell_value_by_header(ws_omni_summary, "build_id") == "test_build_id"
diff --git a/tests/test_generate_nightly_perf_html.py b/tests/test_generate_nightly_perf_html.py
new file mode 100644
index 000000000..4e77eb3ad
--- /dev/null
+++ b/tests/test_generate_nightly_perf_html.py
@@ -0,0 +1,54 @@
+import importlib.util
+import json
+import sys
+from pathlib import Path
+
+import pytest
+
+pytestmark = [pytest.mark.core_model, pytest.mark.cpu]
+
+
+def _load_html_module():
+    repo_root = Path(__file__).resolve().parents[1]
+    module_path = repo_root / "tools" / "nightly" / "generate_nightly_perf_html.py"
+    spec = importlib.util.spec_from_file_location("generate_nightly_perf_html", module_path)
+    module = importlib.util.module_from_spec(spec)
+    sys.modules[spec.name] = module
+    spec.loader.exec_module(module)
+    return module
+
+
+def test_generate_html_report_with_perf_templates(tmp_path: Path):
+    module = _load_html_module()
+    repo_root = Path(__file__).resolve().parents[1]
+    perf_scripts_dir = repo_root / "tests" / "dfx" / "perf" / "scripts"
+
+    omni_template_path = perf_scripts_dir / "result_omni_template.json"
+    diffusion_template_path = perf_scripts_dir / "diffusion_result_template.json"
+
+    omni_record = json.loads(omni_template_path.read_text(encoding="utf-8"))
+    diffusion_records = json.loads(diffusion_template_path.read_text(encoding="utf-8"))
+
+    input_dir = tmp_path / "input"
+    diffusion_input_dir = tmp_path / "diffusion_input"
+    input_dir.mkdir()
+    diffusion_input_dir.mkdir()
+
+    omni_result_file = input_dir / "result_test_perf_random_1_4_in2500_out900_20260415-185642.json"
+    diffusion_result_file = diffusion_input_dir / "diffusion_result_qwen_image_edit_20260415-193200.json"
+    omni_result_file.write_text(json.dumps(omni_record, ensure_ascii=False, indent=2), encoding="utf-8")
+    diffusion_result_file.write_text(json.dumps(diffusion_records, ensure_ascii=False, indent=2), encoding="utf-8")
+
+    output_file = tmp_path / "nightly_perf_v2.html"
+    module.generate_html_report(
+        input_dir=str(input_dir),
+        diffusion_input_dir=str(diffusion_input_dir),
+        output_file=str(output_file),
+    )
+
+    assert output_file.exists()
+    html = output_file.read_text(encoding="utf-8")
+    assert "Nightly Performance Report" in html
+    assert "Omni records <strong>1</strong>" in html
+    assert f"Diffusion records <strong>{len(diffusion_records)}</strong>" in html
+    assert "const DIFF_DATA =" in html
diff --git a/tools/nightly/generate_nightly_perf_excel.py b/tools/nightly/generate_nightly_perf_excel.py
index 4bb778531..6ba1d1eef 100644
--- a/tools/nightly/generate_nightly_perf_excel.py
+++ b/tools/nightly/generate_nightly_perf_excel.py
@@ -665,6 +665,21 @@ def _to_float_if_numeric(value: Any) -> Any:
     return value
 
 
+def _to_excel_compatible(value: Any) -> Any:
+    """Convert non-scalar objects to JSON string for openpyxl cell values."""
+    if isinstance(value, (dict, list, tuple)):
+        try:
+            return json.dumps(value, ensure_ascii=False, sort_keys=True)
+        except (TypeError, ValueError):
+            return str(value)
+    if isinstance(value, set):
+        try:
+            return json.dumps(sorted(value), ensure_ascii=False)
+        except (TypeError, ValueError):
+            return str(value)
+    return value
+
+
 def _write_sheet(
     ws,
     columns: Sequence[str],
@@ -680,6 +695,7 @@ def _write_sheet(
             v = record.get(col)
             if col in numeric_set:
                 v = _to_float_if_numeric(v)
+            v = _to_excel_compatible(v)
             row_values.append(v)
         ws.append(row_values)
 
diff --git a/tools/nightly/generate_nightly_perf_html.py b/tools/nightly/generate_nightly_perf_html.py
index dd5ece790..a50a46255 100644
--- a/tools/nightly/generate_nightly_perf_html.py
+++ b/tools/nightly/generate_nightly_perf_html.py
@@ -17,7 +17,7 @@ from typing import Any
 LOGGER = logging.getLogger(__name__)
 
 _RESULT_JSON_PREFIX = "result_test_"
-_DIFFUSION_JSON_PREFIX = "diffusion_perf_"
+_DIFFUSION_JSON_PREFIXES = ("diffusion_perf_", "diffusion_result_")
 DEFAULT_INPUT_DIR = os.getenv("DEFAULT_INPUT_DIR") or "tests"
 DEFAULT_OUTPUT_DIR = os.getenv("DEFAULT_OUTPUT_DIR") or "tests"
 DEFAULT_DIFFUSION_INPUT_DIR = os.getenv("DIFFUSION_BENCHMARK_DIR")
@@ -51,7 +51,7 @@ def _default_diffusion_input_dir(input_dir: str) -> str:
     return DEFAULT_DIFFUSION_INPUT_DIR if DEFAULT_DIFFUSION_INPUT_DIR else input_dir
 
 
-def _load_json_file(path: str) -> dict[str, Any] | None:
+def _load_json_file(path: str) -> dict[str, Any] | list[Any] | None:
     try:
         with open(path, encoding="utf-8") as f:
             data = json.load(f)
@@ -59,8 +59,8 @@ def _load_json_file(path: str) -> dict[str, Any] | None:
         LOGGER.warning("failed to load json '%s': %s", path, exc)
         return None
 
-    if not isinstance(data, dict):
-        LOGGER.warning("json root in '%s' is not an object, skip", path)
+    if not isinstance(data, (dict, list)):
+        LOGGER.warning("json root in '%s' is not an object or list, skip", path)
         return None
 
     return data
@@ -170,9 +170,10 @@ def _iter_omni_json_records(input_dir: str) -> Iterable[dict[str, Any]]:
 
 def _parse_diffusion_from_filename(filename: str) -> dict[str, Any]:
     name, ext = os.path.splitext(filename)
-    if ext != ".json" or not name.startswith(_DIFFUSION_JSON_PREFIX):
+    if ext != ".json" or not any(name.startswith(prefix) for prefix in _DIFFUSION_JSON_PREFIXES):
         return {}
-    core = name[len(_DIFFUSION_JSON_PREFIX) :]
+    matched_prefix = next(prefix for prefix in _DIFFUSION_JSON_PREFIXES if name.startswith(prefix))
+    core = name[len(matched_prefix) :]
     parts = core.split("_")
     if len(parts) < 2:
         return {}
@@ -195,7 +196,7 @@ def _iter_diffusion_json_records(input_dir: str) -> Iterable[dict[str, Any]]:
         return
 
     for entry in sorted(os.listdir(input_dir)):
-        if not entry.endswith(".json") or not entry.startswith(_DIFFUSION_JSON_PREFIX):
+        if not entry.endswith(".json") or not any(entry.startswith(prefix) for prefix in _DIFFUSION_JSON_PREFIXES):
             continue
         full_path = os.path.join(input_dir, entry)
         if not os.path.isfile(full_path):
@@ -204,17 +205,32 @@ def _iter_diffusion_json_records(input_dir: str) -> Iterable[dict[str, Any]]:
         if data is None:
             continue
 
-        record: dict[str, Any] = dict(data)
         filename_meta = _parse_diffusion_from_filename(os.path.basename(full_path))
-        if "date" not in record or not record.get("date"):
-            record["date"] = filename_meta.get("date") or datetime.now(
-                timezone.utc,
-            ).strftime("%Y%m%d-%H%M%S")
-        if "test_name" not in record or not record.get("test_name"):
-            if "test_name" in filename_meta:
-                record["test_name"] = filename_meta["test_name"]
-        record["source_file"] = os.path.basename(full_path)
-        yield record
+        if isinstance(data, dict):
+            records = [data]
+        elif isinstance(data, list):
+            records = [r for r in data if isinstance(r, dict)]
+        else:
+            records = []
+
+        if not records:
+            LOGGER.warning("diffusion json '%s' has no valid records, skip", full_path)
+            continue
+
+        for record in records:
+            flat: dict[str, Any] = dict(record)
+            result = flat.pop("result", None)
+            if isinstance(result, dict):
+                flat.update(result)
+            if "date" not in flat or not flat.get("date"):
+                flat["date"] = filename_meta.get("date") or datetime.now(
+                    timezone.utc,
+                ).strftime("%Y%m%d-%H%M%S")
+            if "test_name" not in flat or not flat.get("test_name"):
+                if "test_name" in filename_meta:
+                    flat["test_name"] = filename_meta["test_name"]
+            flat["source_file"] = os.path.basename(full_path)
+            yield flat
 
 
 def _collect_omni_records(input_dir: str) -> list[dict[str, Any]]: