dump on demand

stand.py

@@ -47,9 +47,6 @@ if not new_df.equals(df) and not changed:
     restapi.data = df = new_df
 
 
-restapi.dfh.dump()
-
-
 print(">>> end of streamlit run")
 
 

tableapi.py

@@ -19,7 +19,11 @@ class TableAPI:
 
     @data.setter
     def data(self, df):
+        if self.dfh.df.equals(df):
+            print("<<< skipping dump because dataframe did not change")
+            return
         self.dfh.df = df
+        self.dfh.dump()
 
 
     def GET(self):
@@ -30,6 +34,7 @@ class TableAPI:
         kwargs = kwargs or cp.request.json
         self.dfh.append(kwargs)
         self._trigger_changed()
+        self.dfh.dump()
         return str(self.dfh.df)
 
     def DELETE(self):