diff --git a/app/data/__init__.py b/app/data/__init__.py
index b7010b9..56160d5 100644
--- a/app/data/__init__.py
+++ b/app/data/__init__.py
@@ -286,12 +286,11 @@ def get_total_administrations(area=None):
             {'$group': {'_id': '{}', 'tot': {'$sum': '$totale'}}}
         ]
     try:
-
         cursor = VAX_SUMMARY_COLL.aggregate(pipeline=pipe)
         tot_adms = next(cursor)['tot']
     except Exception as e:
         app.logger.error(f"While getting total admins: {e}")
-    return tot_adms
+    return int(tot_adms)
 
 
 def get_age_chart_data(area=None):
@@ -326,7 +325,7 @@ def get_category_chart_data(area=None):
     """Return category series data"""
     chart_data = []
     if area is not None:
-        match = {'$match': {VAX_AREA_KEY: area}},
+        match = {'$match': {VAX_AREA_KEY: area}}
         group = {
             '$group': {
                 '_id': f'${VAX_AREA_KEY}',
diff --git a/app/data/etl.py b/app/data/etl.py
index ffca76c..cca6eef 100644
--- a/app/data/etl.py
+++ b/app/data/etl.py
@@ -455,10 +455,21 @@ def augment_summary_vax_df(df):
         - column population based on mapping of VAX_AREA_KEY
           to config ITALY_POPULATION
     """
-    df['_id'] = (
-            df[VAX_DATE_KEY].apply(lambda x: x.strftime(VAX_DATE_FMT)) +
-            df[VAX_AREA_KEY]
+    out_df = pd.DataFrame()
+    for r in df[VAX_AREA_KEY].unique():
+        reg_df = df[df[VAX_AREA_KEY] == r]
+        reg_df = reg_df.set_index(VAX_DATE_KEY).resample('1D').asfreq()
+        for col in reg_df:
+            if isinstance(reg_df[col].values[-1], str):
+                reg_df[col].ffill(inplace=True)
+        else:
+            reg_df.fillna(0, inplace=True)
+        out_df = out_df.append(reg_df)
+    out_df.reset_index(inplace=True)
+    out_df['_id'] = (
+            out_df[VAX_DATE_KEY].apply(lambda x: x.strftime(VAX_DATE_FMT)) +
+            out_df[VAX_AREA_KEY]
     )
-    df[POP_KEY] = df[VAX_AREA_KEY].apply(
+    out_df[POP_KEY] = out_df[VAX_AREA_KEY].apply(
         lambda x: ITALY_POPULATION[OD_TO_PC_MAP[x]])
-    return df
+    return out_df
diff --git a/app/db/update.py b/app/db/update.py
index 1238fb6..a6636ae 100644
--- a/app/db/update.py
+++ b/app/db/update.py
@@ -3,7 +3,7 @@
 """
 import pandas as pd
 from flask import current_app as app
-from pymongo import UpdateOne
+from pymongo import UpdateOne, InsertOne
 
 from app.data import (
     NAT_DATA_COLL, NAT_TRENDS_COLL, NAT_SERIES_COLL, REG_DATA_COLL,
@@ -353,7 +353,7 @@ def update_provincial_series_or_trends_collection(coll_type):
 def update_vax_collection(summary=False):
     """Update vax / vax_summary collection"""
     response = {"status": "ko", "n_inserted_docs": 0, "errors": []}
-    inserted_ids = []
+    operations = []
     if not summary:
         collection = VAX_COLL
         url = URL_VAX_DATA
@@ -365,38 +365,22 @@ def update_vax_collection(summary=False):
         df = pd.read_csv(url, parse_dates=[VAX_DATE_KEY])
         df = augment_summary_vax_df(df)
     try:
-        records_in_db = list(collection.find())
-        if records_in_db:
-            df_mongo = pd.DataFrame(records_in_db)
-            latest_dt_target = df_mongo[VAX_DATE_KEY].max()
-            latest_dt_source = df[VAX_DATE_KEY].max()
-            # latest_dt_target > latest_dt source is not an option
-            if latest_dt_target < latest_dt_source:
-                df_to_db = df[df[VAX_DATE_KEY] > latest_dt_target]
-                new_records = df_to_db.to_dict(orient='records')
-                r = collection.insert_many(new_records, ordered=True)
-                inserted_ids.extend(r.inserted_ids)
-            if latest_dt_target == latest_dt_source:
-                df = df[df[VAX_DATE_KEY] == latest_dt_source]
-                operations = []
-                for index, row in df.iterrows():
-                    _id = row['_id']
-                    new_value = row.to_dict()
-                    operations.append(
-                        UpdateOne({'_id': _id}, {'$set': new_value})
-                    )
-                r = collection.bulk_write(operations)
-                response['bulk_update'] = r.bulk_api_result
-            response["status"] = "ok"
-        else:
-            msg = f"Filling empty {collection.name}"
-            app.logger.warning(msg)
-            r = collection.insert_many(df.to_dict(orient='records'))
-            inserted_ids.extend(r.inserted_ids)
-            response["status"] = "ok"
-            response["msg"] = msg
-        response["n_inserted_docs"] = len(inserted_ids)
-        msg = f"{len(inserted_ids)} docs updated in {collection.name}"
+        for index, row in df.iterrows():
+            _id = row['_id']
+            cursor = collection.find({'_id': _id})
+            new_value = row.to_dict()
+            try:
+                next(cursor)
+                operations.append(UpdateOne({'_id': _id}, {'$set': new_value}))
+            except StopIteration:
+                operations.append(InsertOne(new_value))
+        r = collection.bulk_write(operations)
+        bulk_result = r.bulk_api_result
+        response['bulk_update'] = bulk_result
+        response["status"] = "ok"
+        n_inserted = bulk_result['nInserted']
+        n_modified = bulk_result['nModified']
+        msg = f"{n_inserted} inserted and {n_modified} modified"
         app.logger.warning(msg)
     except Exception as e:
         app.logger.error(f"While updating vax collection: {e}")
diff --git a/app/static/js/vaccines-charts.js b/app/static/js/vaccines-charts.js
index 8ab3fa0..1056ff1 100644
--- a/app/static/js/vaccines-charts.js
+++ b/app/static/js/vaccines-charts.js
@@ -70,6 +70,16 @@ if (!REGIONS.includes(area)) {
                 text: adminsTimeseriesyAxisTitle
             }
         },
+        tooltip: {
+            crosshairs: {
+                width: 1,
+                color: 'gray',
+                dashStyle: 'ShortDashDot'
+            },
+            shared: true,
+            split: false,
+            enabled: true
+        },
         legend: {
             enabled: false
         },
@@ -178,8 +188,6 @@ let adminsPerCategory = {
         data: adminsPerCategoryData
     }],
     subtitle: subtitle,
-    credits: {
-        enabled: false
-    }
+    credits: credits
 }
 Highcharts.chart('chart-pie-categories', adminsPerCategory);