diff --git a/client/jsFiles/SEAWebClientCommunication.js b/client/jsFiles/SEAWebClientCommunication.js
index 3cbacde..c95612e 100644
--- a/client/jsFiles/SEAWebClientCommunication.js
+++ b/client/jsFiles/SEAWebClientCommunication.js
@@ -406,8 +406,9 @@ function successHandler(s, message) {
         begin = timeRange[0] - timeRange[1];
         select.value = begin;
         // Server-request for variable-list.*/
+        console.log('TIME', window['clientTags'], timeRange)
         reqJSONPOST(0, "http://" + hostPort + "/getvars",
-                "time=" + timeRange[1]
+                "time=" + timeRange[0] + ',' + timeRange[1]
                 + window['clientTags']
                 + "&userconfiguration=" + JSON.stringify(getFormattedUserConfigurationFromLocalStorage())
                 + "&id=" + clientID, successHandler, errorHandler);
diff --git a/client/jsFiles/SEAWebClientGraphics.js b/client/jsFiles/SEAWebClientGraphics.js
index 6a80407..572a228 100644
--- a/client/jsFiles/SEAWebClientGraphics.js
+++ b/client/jsFiles/SEAWebClientGraphics.js
@@ -1073,7 +1073,7 @@ let graphs = (function (){
             currentMaxTime = maxTime;
             currentMinTime = minTime;
         }
-        AJAX("http://" + hostPort + "/gettime?time=-1800,0&id="+ clientID).getJSON().then(function(data){
+        AJAX("http://" + hostPort + "/gettime?time=" + window['timerange'] + "&id="+ clientID).getJSON().then(function(data){
             startTime = data.time[1]*1000;
             maxTime = startTime;
             currentMaxTime = maxTime + 60000;
diff --git a/client/jsFiles/SEAWebClientMain.js b/client/jsFiles/SEAWebClientMain.js
index b54fabd..52f5e2a 100644
--- a/client/jsFiles/SEAWebClientMain.js
+++ b/client/jsFiles/SEAWebClientMain.js
@@ -93,7 +93,8 @@ new Settings()
     .treat("showAsync", "sa", to_bool, false)
     .treat("device", "dev", 0, "*")
     .treat("server", "srv", 0, "*")
-    .treat("instrument", "ins", 0, "")
+    .treat("instrument", "instrument", 0, "")
+    .treat("timerange", "time", 0, "-1800,0")
 
 if (window['instrument']) {
      window['clientTags'] = "&instrument=" + window["instrument"];
@@ -111,11 +112,11 @@ function loadFirstBlocks() {
     if (showMain) pushInitCommand("getblock?path=main&", "main")
     if (showConsole) pushInitCommand("console?", "console")
     if (nColumns == 1) { // probably mobile phone}
-        if (showGraphics) pushInitCommand("gettime?time=-1800,0&", "graphics")
+        if (showGraphics) pushInitCommand("gettime?time=" + window["timerange"] + "&", "graphics")
         if (showOverview) pushInitCommand("getblock?path=_overview&", "overview")
     } else {
         if (showOverview) pushInitCommand("getblock?path=_overview&", "overview")
-        if (showGraphics) pushInitCommand("gettime?time=-1800,0&", "graphics")
+        if (showGraphics) pushInitCommand("gettime?time=" + window["timerange"] + "&", "graphics")
         // last is shown first
     }
 }
diff --git a/influxgraph.py b/influxgraph.py
index 7ad9a10..d57254d 100644
--- a/influxgraph.py
+++ b/influxgraph.py
@@ -5,7 +5,7 @@ import io
 import uuid
 from configparser import ConfigParser
 from math import ceil
-from sehistory.influx import InfluxDBWrapper
+from sehistory.seinflux import SEHistory
 from colors import assign_colors_to_curves
 from chart_config import ChartConfig
 from base import Instrument, get_abs_time
@@ -84,8 +84,10 @@ class InfluxGraph:
         logging.info('LIVE %g %g %d %d', end, now, end >= now, self.livemode)
         if interval:
             interval = float(interval)
+        print('CURVES', start - now, end - now, self.tags)
         result = self.db.curves(start, end, queried_variables, merge='_measurement',
                                 interval=interval or None, **self.tags)
+        print('LEN', len(result))
         self.update_last(result)
         self.db.complete(result, self.last_time, 'stream')
         self.last_minute = now // 60
@@ -145,19 +147,19 @@ class InfluxGraph:
 
         self.tags = split_tags(tags)
         if instrument:
-            tags['stream'] = list(self.db.get_streams(instrument))
-        print('GETAV', self.tags)
+            self.tags['stream'] = list(self.db.get_streams(instrument))
+        print('TAGS', self.tags)
         blocks = self.get_available_variables(start_time, end_time, self.chart_configs, userconfiguration)
-        device_name = tags.get('device', '<unknown>')
+        device_name = self.tags.get('device', '<unknown>')
         # initialize self.last_values to keep track of the available variables
         self.last_values = {var["name"]: [0, None] for block in blocks for var in block["curves"]}
         assign_colors_to_curves(blocks)
         result = dict(type='var_list')
         result['blocks'] = blocks
         result['device'] = device_name
-        print('DEVICE', device_name, tags)
-        for block in blocks:
-            print(block['tag'], [c['name'] for c in block['curves']])
+        # print('DEVICE', device_name, tags)
+        # for block in blocks:
+        #     print(block['tag'], [c['name'] for c in block['curves']])
         return result
 
     def get_available_variables(self, start_time, end_time, chart_configs=None, user_config=None):
@@ -307,7 +309,7 @@ class InfluxGraph:
             # the server is only waiting after a None return
             # this avoids to many queries with expected empty result
             return None
-        last_time = int(min(self.last_time.values()))
+        last_time = int(min(self.last_time.values(), default=now-3600))
         # if len(self.last_time) > 1:
         #     print('time_poll_jitter', max(self.last_time.values()) - min(self.last_time.values()))
         prev_minute, self.last_minute = self.last_minute, now // 60
@@ -416,7 +418,7 @@ class SecopInfluxInstrument(SecopInstrument):
         config.optionxform = str
         config.read("./config/influx.ini")
         section = config["INFLUX"]
-        self.db = InfluxDBWrapper('linse-c')
+        self.db = SEHistory()
         # self.db = InfluxDBWrapper(uri=section["url"], token=section["token"],
         #                           org=section["org"], bucket=section['bucket'])
         # self.influx_data_getter = InfluxDataGetter(self.db, inst_name)
@@ -425,7 +427,9 @@ class SecopInfluxInstrument(SecopInstrument):
     def new_client(self):
         return self.register(SecopInfluxClient(self))
 
-    def get_stream_tags(self, timestamp=None):
+    def get_streams(self, timestamp=None):
         return self.db.get_streams(None, timestamp)
 
+    def get_experiments(self, start=None, stop=None):
+        return self.db.get_experiments(start, stop)
 
diff --git a/webserver.py b/webserver.py
index 9ba7bda..2924b31 100755
--- a/webserver.py
+++ b/webserver.py
@@ -88,7 +88,6 @@ def get_update(path=None):
             logging.info('CLOSED %s', client.id)
             print('CLOSE client')
             instrument.remove(client)
-            pass
         except Exception as e:
             logging.info('error')
             logging.error('%s', traceback.format_exc())
@@ -211,21 +210,21 @@ def replace_by_empty(file):
 
 
 @app.route('/')
-def main():
+def default():
     return general_file('SEAWebClient.html')
 
 
-@app.route('/select')
-def default():
+@app.route('/select_instrument')
+def select_instrument():
     out = ['''<html><body><table>
 <style>
 th {
   text-align: left;
 }
 </style>
-<tr><th>Instrument</th><th colspan=99>Devices</th></tr>''']
+<tr><th>instrument</th><th colspan=99>devices</th></tr>''']
     result = {}
-    for stream, tags in instrument.get_stream_tags().items():
+    for stream, tags in instrument.get_streams().items():
         ins = tags.get('instrument', '0')
         result.setdefault(ins, []).append((stream, tags.get('device')))
     bare_streams = result.pop('0', [])
@@ -235,7 +234,76 @@ th {
         out.append('</tr>')
     for stream, device in bare_streams:
         out.append(f'<tr><td><a href="/?srv={stream}">{stream}</a></td><td>{device}</td><tr>')
-    out.extend(['</table></body?</html>', ''])
+    out.extend(['</table></body></html>', ''])
+    return '\n'.join(out)
+
+
+@app.route('/select_experiment')
+def select_experiment():
+    out = ['''<html><body>
+<style>
+th {
+  text-align: left;
+  background-color: #cccccc;
+}
+a {
+  text-decoration: none;
+}
+</style><table>
+''']
+    showtitle = 0
+    ONEMONTH = 30 * 24 * 3600
+
+    def title(text):
+        out.append(f'<tr><td colspan=2><b>{text}</b></td></tr>')
+
+    # TODO: sort this by (instrument / device) and list dates
+    # period format: Ymd..Ymd, Ymd (single date), Ymd..now, HM..now
+    try:
+        now = time.time()
+        timerange = flask.request.values.get('time')
+        if timerange == 'all':
+            starttime, endtime = None, None
+        elif timerange:
+            timerange = timerange.split(',')
+            starttime, endtime = [None if timerange[i] == '0' else int(timerange[i]) for i in (0, -1)]
+        else:
+            starttime, endtime = now - ONEMONTH, now
+
+        chunk_list = []
+        for key, chunk_dict in instrument.get_experiments(starttime, endtime).items():
+            for (streams, devices), chunks in chunk_dict.items():
+                chunk_list.extend((r[1], r[0], key, devices) for r in chunks)
+        chunk_list.sort(reverse=True)
+        for end, beg, key, devices in chunk_list:
+            today, begdate, enddate = (time.strftime("%Y-%m-%d", time.localtime(t)) for t in (now, beg, end))
+            args = ['='.join(key)]
+            if end > now:
+                if begdate == today:
+                    daterange = f'since {time.strftime("%H:%M", time.localtime(beg))}'
+                else:
+                    daterange = f'since {begdate}'
+                if showtitle == 0:
+                    title('currently running')
+                    showtitle = 1
+            else:
+                daterange = begdate if begdate == enddate else f'{begdate}...{enddate}'
+                if end > now - ONEMONTH:
+                    if showtitle == 1:
+                        title('older than 30 days')
+                        showtitle = 2
+
+            print('A', args)
+            out.append(f'<tr><th><a href="/?{"&".join(args)}">{key[1]} / {" ".join(devices)}</a></th>')
+            out.append(f'<td>{daterange}</td></tr>')
+        if timerange:
+            out.append(f'<h3><a href="/select_experiment?time=all">earlier dates</a></h3><br>')
+        out.extend(['</table></body></html>', ''])
+    except Exception as e:
+        logging.error('%s', traceback.format_exc())
+        circularlog.log()
+        out = [f"ERROR {e!r}"]
+
     return '\n'.join(out)