diff --git a/rowers/dataroutines.py b/rowers/dataroutines.py
index 92c83cb7..154d75f8 100644
--- a/rowers/dataroutines.py
+++ b/rowers/dataroutines.py
@@ -1512,7 +1512,7 @@ def getrowdata_pl(id=0, doclean=False, convertnewtons=True,
 
     
 def read_data(columns, ids=[], doclean=True, workstrokesonly=True, debug=False, for_chart=False, compute=True,
-              startenddict={}):
+              startenddict={}, driveenergy=True):
     if ids:
         csvfilenames = [
             'media/strokedata_{id}.parquet.gz'.format(id=id) for id in ids]
@@ -1520,7 +1520,9 @@ def read_data(columns, ids=[], doclean=True, workstrokesonly=True, debug=False,
         return pl.DataFrame()
 
     data = []
-    columns = [c for c in columns if c != 'None'] + ['distance', 'spm', 'workoutid','workoutstate', 'driveenergy']
+    columns = [c for c in columns if c != 'None'] + ['distance', 'spm', 'workoutid','workoutstate']
+    if driveenergy:
+        columns = columns + ['driveenergy']
     columns = list(set(columns))
 
     for id, f in zip(ids, csvfilenames):
@@ -1583,9 +1585,10 @@ def read_data(columns, ids=[], doclean=True, workstrokesonly=True, debug=False,
     if len(data)==0:
         return pl.DataFrame()
 
+    
     try:
         datadf = pl.concat(data).select(columns)
-    except (SchemaError, ShapeError):
+    except (ShapeError, SchemaError):
         data = [
             df.select(columns)
             for df in data]
@@ -1593,6 +1596,7 @@ def read_data(columns, ids=[], doclean=True, workstrokesonly=True, debug=False,
         # float columns
         floatcolumns = []
         intcolumns = []
+        stringcolumns = []
         for c in columns:
             try:
                 if metricsdicts[c]['numtype'] == 'float':
@@ -1600,7 +1604,11 @@ def read_data(columns, ids=[], doclean=True, workstrokesonly=True, debug=False,
                 if metricsdicts[c]['numtype'] == 'integer':
                     intcolumns.append(c)
             except KeyError:
-                pass
+                if c[0] == 'f':
+                    stringcolumns.append(c)
+                else:
+                    intcolumns.append(c)
+                
         data = [
             df.with_columns(
                 cs.float().cast(pl.Float64)
@@ -1610,6 +1618,8 @@ def read_data(columns, ids=[], doclean=True, workstrokesonly=True, debug=False,
                 cs.by_name(intcolumns).cast(pl.Int64)
             ).with_columns(
                 cs.by_name(floatcolumns).cast(pl.Float64)
+            ).with_columns(
+                cs.by_name(stringcolumns).cast(pl.String)
             )
             for df in data
         ]
diff --git a/rowers/interactiveplots.py b/rowers/interactiveplots.py
index af49c155..2a3769ce 100644
--- a/rowers/interactiveplots.py
+++ b/rowers/interactiveplots.py
@@ -1802,7 +1802,7 @@ def interactive_flexchart_stacked(id, r, xparam='time',
         'metrics': metrics_list,
     }
 
-    script, div = get_chart("/stacked", chart_data, debug=False)
+    script, div = get_chart("/stacked", chart_data, debug=True)
 
     return script, div
 
@@ -2129,16 +2129,20 @@ def interactive_multiple_compare_chart(ids, xparam, yparam, plottype='line',
         compute = True
         doclean = True
 
+    driveenergy = False
+    if 'driveenergy' in columns:
+        driveenergy = True
+
 
     datadf = pl.DataFrame()
     if promember:
         datadf = dataprep.read_data(columns, ids=ids, doclean=doclean,
-                                    compute=compute,
+                                    compute=compute, driveenergy=driveenergy,
                                     workstrokesonly=workstrokesonly, for_chart=True,
                                     startenddict=startenddict)
     else:
         datadf = dataprep.read_data(columns_basic, ids=ids, doclean=doclean,
-                                    compute=compute,
+                                    compute=compute, driveenergy = driveenergy,
                                     workstrokesonly=workstrokesonly, for_chart=True,
                                     startenddict=startenddict)
 
@@ -2165,10 +2169,10 @@ def interactive_multiple_compare_chart(ids, xparam, yparam, plottype='line',
 
     if (xparam == 'time'):
         datadf = datadf.with_columns((pl.col(xparam)-datadf[0,xparam]).alias(xparam))
-    
+
     data_dict = datadf.to_dicts()
 
-    metrics_list = [{'name': name, 'rowingmetrics':d } for name, d in metrics.rowingmetrics]
+    metrics_list = [{'name': name, 'rowingmetrics':{k: v for k, v in d.items() if k != 'numtype_pl'} } for name, d in metrics.rowingmetrics]
 
     try:
         workoutsdict = [{'id': id, 'label': labeldict[id]} for id in ids]
@@ -2185,6 +2189,7 @@ def interactive_multiple_compare_chart(ids, xparam, yparam, plottype='line',
         'workouts': workoutsdict,
     }
 
+
     script, div = get_chart("/compare", chart_data, debug=False)
     return script, div
 
diff --git a/rowers/metrics.py b/rowers/metrics.py
index 3766addb..83299c9c 100644
--- a/rowers/metrics.py
+++ b/rowers/metrics.py
@@ -5,6 +5,7 @@ import numpy as np
 import pandas as pd
 from scipy import optimize
 from django.utils import timezone
+from polars import String, Int32, Float64
 
 from math import log10, log2
 from rowers.mytypes import otwtypes, otetypes
diff --git a/rowers/tests/testdata/testdata.tcx.gz b/rowers/tests/testdata/testdata.tcx.gz
index 8058cd35..cca9807a 100644
Binary files a/rowers/tests/testdata/testdata.tcx.gz and b/rowers/tests/testdata/testdata.tcx.gz differ