add metadata_dd_version in the metadata

pyproject.toml

@@ -40,7 +40,7 @@ dependencies = [
     "click_option_group>=0.5",
     "distro>=1.8.0",
     "email-validator>=1.1",
-    "imas-python",
+    "imas-python>=2.0.1",
     "netCDF4>=1.5",
     "numpy>=1.14",
     "pydantic>=2.10.6",

src/simdb/imas/metadata.py

@@ -5,6 +5,7 @@
 import imas
 import imas.dd_zip
 import imas.ids_defs
+from semantic_version import Version
 
 from simdb.remote.models import _array_to_range
 
@@ -121,13 +122,32 @@ def load_imas_metadata(ids_dist, entry) -> dict:
     :return: Dictionary containing metadata.
     """
 
-    metadata = {}
+    latest_dd_version = imas.dd_zip.latest_dd_version()
+    if latest_dd_version is None:
+        raise RuntimeError("Could not determine the data dictionary version.")
+
+    try:
+        parsed_dd_version = Version(latest_dd_version)
+    except ValueError as exc:
+        raise RuntimeError(
+            f"Could not parse the data dictionary version: {latest_dd_version!r}."
+        ) from exc
+
+    dd_major_version = parsed_dd_version.major
+    if not isinstance(dd_major_version, int):
+        raise RuntimeError(
+            f"Could not determine the major data dictionary version from "
+            f"{latest_dd_version!r}."
+        )
+
+    if dd_major_version > 4:
+        raise RuntimeError(
+            f"Unsupported data dictionary version {latest_dd_version!r}: "
+        )
+
+    metadata = {"metadata_dd_version": latest_dd_version}
     for ids_name, _v in ids_dist.items():
         ids = entry.get(ids_name, autoconvert=False)
-        # Explicitly convert the IDS to the target version
-        latest_dd_version = imas.dd_zip.latest_dd_version()
-        if latest_dd_version is None:
-            raise ValueError("Could not determine the latest DD version.")
         ids = imas.convert_ids(ids, latest_dd_version)
         for node in imas.util.tree_iter(ids):
             metadata[extract_ids_path(str(node.coordinates)).replace("/", ".")] = (  # type: ignore