one registry per pgroup

stand.py

@@ -1,5 +1,6 @@
 #!/usr/bin/env python
 
+from collections import defaultdict
 from datetime import datetime
 from typing import Annotated, Any
 
@@ -26,7 +27,7 @@ lib = ac.get_library(
 
 
 router = APIRouter()
-grids = Registry()
+grids = defaultdict(Registry)
 
 
 OPTIONS = {
@@ -62,9 +63,8 @@ def update_adb(evt):
 
 def update_grids(evt):
     sender = evt.sender
-    for grid in grids:
-        if grid.options["context"]["pgroup"] != evt.args["context"]["pgroup"]:
-            continue
+    pgroup = evt.args["context"]["pgroup"]
+    for grid in grids[pgroup]:
         grid.set_cell_server(evt)
         if grid == sender:
             # the sender is already up-to-date
@@ -93,7 +93,7 @@ def page(pgroup: PGroup):
     grid.classes("h-[calc(100vh-2rem)]") # full height minus padding
     grid.on("cellValueChanged", update_adb)
     grid.on("cellValueChanged", update_grids)
-    grids.add(grid)
+    grids[pgroup].add(grid)
 
 
 @router.post("/{pgroup}/append/")
@@ -107,9 +107,7 @@ def append(pgroup: PGroup, row: dict[str, Any]):
     row = {"index": now, **row} # setdefault would not force index to be the first column
 
     res = []
-    for grid in grids:
-        if grid.options["context"]["pgroup"] != pgroup:
-            continue
+    for grid in grids[pgroup]:
         grid.append(row)
         res.append(grid.options)