diff --git a/src/emcommon/metrics/metrics_summaries.py b/src/emcommon/metrics/metrics_summaries.py
index ca34178..e7d50b0 100644
--- a/src/emcommon/metrics/metrics_summaries.py
+++ b/src/emcommon/metrics/metrics_summaries.py
@@ -4,20 +4,39 @@
 
 
 # @memoize
-def labeled_mode_for_trip(composite_trip: dict, trip_labels_map: dict[str, any]) -> str:
+def label_for_trip(composite_trip: dict, label_key: str, trip_labels_map: dict[str, any] = None) -> str:
     """
     :param composite_trip: composite trip
+    :param label_key: which type of label to get ('mode', 'purpose', or 'replaced_mode')
     :param trip_labels_map: trip labels map
-    :return: labeled mode for the trip, derived from the trip's user_input if available, or the trip_labels_map if available, or 'unlabeled' otherwise
+    :return: the label for the trip, derived from the trip's user_input if available, or the trip_labels_map if available, or 'unlabeled' otherwise
     """
+    label_key = label_key.upper()
+    label_key_confirm = label_key.lower() + '_confirm'
     UNLABELED = 'unlabeled'
     if not composite_trip:
         return UNLABELED
-    if 'user_input' in composite_trip and 'mode_confirm' in composite_trip['user_input']:
-        return composite_trip['user_input']['mode_confirm']
+    if 'user_input' in composite_trip and label_key_confirm in composite_trip['user_input']:
+        return composite_trip['user_input'][label_key_confirm]
     if trip_labels_map and composite_trip['_id']['$oid'] in trip_labels_map:
-        if 'MODE' in trip_labels_map[composite_trip['_id']['$oid']]:
-            return trip_labels_map[composite_trip['_id']['$oid']]['MODE']['data']['label']
+        if label_key_upper in trip_labels_map[composite_trip['_id']['$oid']]:
+            return trip_labels_map[composite_trip['_id']['$oid']][label_key_upper]['data']['label']
+    return UNLABELED
+
+def labeled_purpose_for_trip(composite_trip: dict, trip_labels_map: dict[str, any] = None) -> str:
+    """
+    :param composite_trip: composite trip
+    :param trip_labels_map: trip labels map
+    :return: labeled purpose for the trip, derived from the trip's user_input if available, or the trip_labels_map if available, or 'unlabeled' otherwise
+    """
+    UNLABELED = 'unlabeled'
+    if not composite_trip:
+        return UNLABELED
+    if 'user_input' in composite_trip and 'purpose_confirm' in composite_trip['user_input']:
+        return composite_trip['user_input']['purpose_confirm']
+    if trip_labels_map and composite_trip['_id']['$oid'] in trip_labels_map:
+        if 'PURPOSE' in trip_labels_map[composite_trip['_id']['$oid']]:
+            return trip_labels_map[composite_trip['_id']['$oid']]['PURPOSE']['data']['label']
     return UNLABELED
 
 
@@ -26,7 +45,7 @@ def generate_summaries(metrics: list[str], composite_trips: list, trip_labels_ma
     return {metric: get_summary_for_metric(metric, composite_trips, trip_labels_map) for metric in metrics}
 
 
-def value_of_metric_for_trip(metric: str, trip: dict, trip_labels_map: dict[str, any]):
+def value_of_metric_for_trip(metric: str, trip: dict):
     if metric == 'distance':
         return trip['distance']
     elif metric == 'count':
@@ -36,7 +55,7 @@ def value_of_metric_for_trip(metric: str, trip: dict, trip_labels_map: dict[str,
     return None
 
 
-def get_summary_for_metric(metric: str, composite_trips: list, trip_labels_map: dict[str, any]):
+def get_summary_for_metric(metric: str, composite_trips: list, trip_labels_map: dict[str, any] = None):
     days_of_metrics_data = {}
     for trip in composite_trips:
         date = trip['start_fmt_time'].split('T')[0]
@@ -54,19 +73,24 @@ def get_summary_for_metric(metric: str, composite_trips: list, trip_labels_map:
         days_summaries.append(summary_for_day)
     return days_summaries
 
-
-def metric_summary_by_mode(metric: str, composite_trips: list, trip_labels_map: dict[str, any]):
+def metric_summary_by_mode(metric: str, composite_trips: list, trip_labels_map = None):
     """
     :param composite_trips: list of composite trips
     :return: a dict of mode keys to the metric total for that mode
     """
+    grouping_fields = {
+        'mode_confirm': lambda trip: label_for_trip(trip, 'mode', trip_labels_map),
+        'purpose_confirm': lambda trip: label_for_trip(trip, 'purpose', trip_labels_map),
+        'replaced_mode_confirm': lambda trip: label_for_trip(trip, 'replaced_mode', trip_labels_map),
+    }
+
     mode_to_metric_map = {}
     if not composite_trips:
         return mode_to_metric_map
     for trip in composite_trips:
-        mode_key = 'mode_' + labeled_mode_for_trip(trip, trip_labels_map)
-        if mode_key not in mode_to_metric_map:
-            mode_to_metric_map[mode_key] = 0
-        mode_to_metric_map[mode_key] += value_of_metric_for_trip(
-            metric, trip, trip_labels_map)
+        for grouping_field, field_for_trip_fn in grouping_fields.items():
+            grouping_key = grouping_field + '_' + field_for_trip_fn(trip)
+            if grouping_key not in mode_to_metric_map:
+                mode_to_metric_map[grouping_key] = 0
+            mode_to_metric_map[grouping_key] += value_of_metric_for_trip(metric, trip)
     return mode_to_metric_map
diff --git a/src/emcommon/util.py b/src/emcommon/util.py
index d056362..6045a28 100644
--- a/src/emcommon/util.py
+++ b/src/emcommon/util.py
@@ -12,3 +12,18 @@ def wrapper(*args, **kwargs):
     return wrapper
 
 # __pragma__('nokwargs')
+
+
+# e-mission-phone www/js/diary/timelineHelper.ts unpackServerData()
+def flatten_db_entry(entry: dict) -> dict:
+    '''
+    DB entries retrieved from the server have '_id', 'metadata', and 'data' fields.
+    This function returns a shallow copy of the obj, which flattens the 'data' field into the top
+    level, while also including '_id', 'metadata.key', and 'metadata.origin_key'.
+    '''
+    return {
+        **entry['data'],
+        '_id': entry['_id'],
+        'key': entry['metadata']['key'],
+        'origin_key': entry['metadata']['origin_key'] if 'origin_key' in entry['metadata'] else entry['metadata']['key']
+    }