fix bugs

app.py

@@ -44,8 +44,12 @@ def to_json_df(con: Connection, tbl: Table) -> pd.DataFrame:
 
 def from_json_df(con: Connection, df: pd.DataFrame, columns: list[str], dtypes: list[Dtype]) -> Table:
     query = ", ".join(
-        "if(" + col + " IS null, null, (" + col + "::JSON::" + str(dtype) + ")"
-        + ("[2:-2]" if str(dtype) == "VARCHAR" else "")  # remove double quotes at the start and end
+        "if(" + col + " IS null, null, "
+        + (
+            "trim(" + col + """::JSON::VARCHAR, '"')"""
+            if str(dtype) == "VARCHAR"
+            else "(" + col + "::JSON::" + str(dtype) + ")"
+          )  # remove double quotes at the start and end
         + ") AS " + col for col, dtype in zip(columns, dtypes))
     return con.sql(f"SELECT {query} FROM df")
 
@@ -139,7 +143,7 @@ with gr.Blocks(css=css) as demo:
             )
         }
     
-    @dataset_dropdown.select(inputs=[dataset_dropdown], outputs=[session_state, loading_codes_json, subset_dropdown, split_dropdown, dataframe])
+    @dataset_dropdown.select(inputs=[session_state, dataset_dropdown], outputs=[session_state, loading_codes_json, subset_dropdown, split_dropdown, dataframe])
     def _show_subset_dropdown(session: str | None, dataset: str):
         subsets, loading_codes = show_subset_dropdown(dataset)
         splits = show_split_dropdown(subsets["value"], loading_codes)
@@ -185,7 +189,12 @@ with gr.Blocks(css=css) as demo:
             dtypes = empty_dataset_tbl.dtypes
             tbl = from_json_df(con, df, columns=columns, dtypes=dtypes)
             # TODO add edits for page > 1
-            con.sql(f"INSERT OR REPLACE INTO edits SELECT * FROM (SELECT unnest(range({len(df)})) AS rowid) POSITIONAL JOIN tbl")
+            # Note: Here we don't use INSERT OR REPLACE because of Not implemented Error: List Update is not supported.
+            con.sql(f"DELETE FROM edits WHERE rowid IN range({len(df)})")
+            try:
+                con.sql(f"INSERT INTO edits SELECT * FROM (SELECT unnest(range({len(df)})) AS rowid) POSITIONAL JOIN tbl")
+            except duckdb.ConversionException as e:
+                raise gr.Error(str(e).split('\n')[0], title="duckdb.ConversionException")
             print(f"Saved {dataset} edits")