docs: data-management column lookup via options_json

scripts/db/display_metadata_validator.py

@@ -196,7 +196,7 @@ def _default_uses_unixepoch(default_value: object) -> bool:
 
 
 def validate_options_json(options_json: str | None) -> tuple[list[str], list[str]]:
-    """校验枚举 options_json 可被解析为 [{value, label}, ...] 结构。"""
+    """校验 options_json：静态枚举数组，或 lookup 对象。"""
     errors: list[str] = []
     warnings: list[str] = []
     if options_json is None or str(options_json).strip() == "":
@@ -206,8 +206,24 @@ def validate_options_json(options_json: str | None) -> tuple[list[str], list[str
     except json.JSONDecodeError as exc:
         errors.append(f"options_json 不是合法 JSON：{exc}")
         return errors, warnings
+
+    if isinstance(parsed, dict):
+        for key in ("ref_table", "value_column", "label_column"):
+            if not str(parsed.get(key) or "").strip():
+                errors.append(f"options_json lookup 必须包含非空 {key}")
+        ident = re.compile(r"^[a-zA-Z_][a-zA-Z0-9_]*$")
+        for key in ("ref_table", "value_column", "label_column", "filter_column"):
+            raw = parsed.get(key)
+            if raw is None or raw == "":
+                continue
+            if not ident.match(str(raw)):
+                errors.append(f"options_json.{key} 必须是安全标识符，当前为 {raw!r}")
+        if parsed.get("filter_column") not in (None, "") and "filter_value" not in parsed:
+            warnings.append("options_json lookup 声明了 filter_column 但未提供 filter_value")
+        return errors, warnings
+
     if not isinstance(parsed, list):
-        errors.append("options_json 必须是 JSON 数组")
+        errors.append("options_json 必须是 JSON 数组（静态枚举）或对象（lookup）")
         return errors, warnings
     for index, item in enumerate(parsed):
         if not isinstance(item, dict):