fix: align research metadata with live WorldQuant responses

backend/app/backtests/contracts.py

@@ -23,6 +23,7 @@ class SimulationSettings(Contract):
     language: Literal["FASTEXPR"] = "FASTEXPR"
     visualization: bool = False
     maxTrade: Literal["ON", "OFF"] = "OFF"
+    maxPosition: Literal["ON", "OFF"] = "OFF"
 
 
 class Candidate(Contract):

backend/app/catalog/research_metadata.py

@@ -70,8 +70,16 @@ def setting_rows(data):
         raise HTTPException(502, "平台设置结构无法识别，未发布新快照") from None
 
 
-def normalize_availability(data):
+def normalize_availability(data, *, instrument_type=None):
+    """Use the request's instrument only for the platform field-detail `data` form.
+
+    Legacy availability rows must still state their own instrument. Missing market,
+    delay or universe never inherits the requested scope.
+    """
     raw = data.get("availability")
+    detail_form = raw is None and isinstance(data.get("data"), list)
+    if detail_form:
+        raw = data["data"]
     if not isinstance(raw, list):
         return {"status": "needs_review", "items": [], "reason": "平台未提供可识别的 availability 列表"}
     rows, malformed = [], False
@@ -83,7 +91,7 @@ def normalize_availability(data):
         universes = universes if isinstance(universes, list) else [universes]
         for universe in universes:
             if (
-                item.get("instrumentType") == "EQUITY"
+                item.get("instrumentType", instrument_type if detail_form else None) == "EQUITY"
                 and type(item.get("delay")) is int
                 and item["delay"] in (0, 1)
                 and isinstance(item.get("region"), str)
@@ -227,8 +235,10 @@ class ResearchMetadata:
 
     async def refresh_availability(self, body):
         data = await upstream(self.client.field_availability(body.field_id, body.scope))
+        if data.get("id") is not None and data["id"] != body.field_id:
+            raise HTTPException(502, "平台返回字段与请求不一致，保留原可用性快照")
         content = {
-            **normalize_availability(data),
+            **normalize_availability(data, instrument_type=body.scope.instrument_type),
             "field_id": body.field_id,
             "scope": body.scope.model_dump(),
         }

backend/app/research/experiments.py

@@ -27,6 +27,17 @@ def scope_of(settings):
     }
 
 
+def seed_settings(snapshot):
+    """Decode executable settings, retaining returned historical dates in the parent snapshot.
+
+    startDate/endDate are result window metadata absent from POST settings. Unknown
+    execution parameters still fail strict validation rather than being discarded.
+    """
+    return SimulationSettings.model_validate(
+        {k: v for k, v in snapshot.items() if k not in ("startDate", "endDate")}
+    )
+
+
 class Experiments:
     def __init__(self, db):
         self.db = db
@@ -315,7 +326,7 @@ class Experiments:
             [parent_snapshot] if parent_snapshot is not None else await self.parents([body.alpha_id], [])
         )
         original = parents[0]
-        base = SimulationSettings.model_validate(original["settings"])
+        base = seed_settings(original["settings"])
         expression = original["expression"]
         snapshots, _ = await self.inputs(body.input_ids)
         groups = defaultdict(list)

backend/app/research/runtime.py

@@ -619,12 +619,15 @@ class ResearchRuntime:
         ):
             raise HTTPException(403, "候选不属于此研究运行的固定输入范围")
         if "backtest" not in run.authorization["methods"] or any(
-            c["settings"]
-            not in (
-                run.authorization.get("allowed_settings", [run.authorization["settings"]])
-                if experiment["evidence"].get("method") == "settings"
-                else [run.authorization["settings"]]
-            )
+            SimulationSettings.model_validate(c["settings"]).model_dump(mode="json")
+            not in [
+                SimulationSettings.model_validate(value).model_dump(mode="json")
+                for value in (
+                    run.authorization.get("allowed_settings", [run.authorization["settings"]])
+                    if experiment["evidence"].get("method") == "settings"
+                    else [run.authorization["settings"]]
+                )
+            ]
             or not c.get("input_ids")
             or any(
                 not any(

backend/app/research/workflows.py

@@ -9,7 +9,7 @@ from ..backtests.contracts import SimulationSettings, fingerprint
 from ..backtests.service import uid
 from ..models import Account, ResearchFlowRun, ResearchStepRun
 from .assets import Assets
-from .experiments import Experiments, scope_of
+from .experiments import Experiments, scope_of, seed_settings
 from .serialization import encode_snapshot as jsonable_encoder
 from .workspace_contracts import WorkflowSpec
 
@@ -195,7 +195,7 @@ class Workflows:
         parents = await experiments.parents(body.parent_alpha_ids, [])
         allowed_settings = [body.settings.model_dump(mode="json")]
         if settings_variant:
-            base = SimulationSettings.model_validate(parents[0]["settings"])
+            base = seed_settings(parents[0]["settings"])
             for snapshot in inputs:
                 scope = snapshot["scope"]
                 target = SimulationSettings.model_validate(