partially done bulk update

parsers/survex.py

@@ -1821,8 +1821,10 @@ class LoadingSurvex:
         nlegstotal = 0
         self.relativefilename = path
 
-        # Cache for parent blocks to save at the end
+        # Cache for parent survex blocks to save at the end
         self._pending_parent_saves = set()
+        # Cache for survexblocks to save at the end (legsall/legslength)
+        self._pending_block_saves = set()
         #self.IdentifyCave(path, svxid, depth)  # this will produce null for survex files which are geographic collections
 
         self.currentsurvexfile = survexblock.survexfile
@@ -2106,14 +2108,23 @@ class LoadingSurvex:
             self.legsnumber = nlegstotal
             self.slength = slengthtotal
 
-        # At the end, save all cached parent blocks
-        for parent in getattr(self, '_pending_parent_saves', set()):
-            try:
-                parent.save(update_fields=None)
-            except Exception as e:
-                print(f"Error saving parent block {parent}: {e}", file=sys.stderr)
 
-        # ...timing removed...
+        # At the end, save all cached survexblocks using bulk_update
+        blocks = list(getattr(self, '_pending_block_saves', set()))
+        if blocks:
+            try:
+                SurvexBlock.objects.bulk_update(blocks, ["legsall", "legslength"])
+            except Exception as e:
+                print(f"Error in bulk_update for survexblocks: {e}", file=sys.stderr)
+
+        # Then save all cached parent survexblocks using bulk_update
+        parents = list(getattr(self, '_pending_parent_saves', set()))
+        if parents:
+            try:
+                SurvexBlock.objects.bulk_update(parents)
+                # SurvexBlock.objects.bulk_update(parents, [f.name for f in SurvexBlock._meta.fields if f.name != 'id'])
+            except Exception as e:
+                print(f"Error in bulk_update for parent blocks: {e}", file=sys.stderr)
 
     def PushdownStackScan(self, survexblock, path, finname, flinear, io_collate):
         """Follows the *include links in all the survex files from the root file  (usually 1623.svx)