feat: add person stats to dashboard

app/base/static/css/style.css

@@ -269,6 +269,13 @@ table.clickable tbody>tr:hover {
 .text-green {
   color: #23be58;
 }
+.text-gray {
+  color: #aaa;
+}
+
+#by_month_history td:first-of-type {
+  text-decoration: dotted underline;
+}
 
 #profileMenu {
   position: absolute;

app/base/templates/dashboard.html

@@ -3,6 +3,18 @@
 
 {% block content %}
 
+<h3>Personen</h3>
+<p>
+Personen gesamt: <b>{{person.by_count.total}}</b>
+(davon haben <b>{{person.by_count.single_visit}}</b> die Werkstatt nur 1x besucht
+und <b>{{person.by_count.long_not_seen}}</b> waren seit über einem Jahr nicht mehr da)
+</p>
+<p>
+  <b>{{person.by_count.no_booking}}</b> haben noch nie Werkstattzeit gebucht.
+  <b>{{person.by_count.no_course}}</b> haben nie eine Einweisung gemacht.
+</p>
+
+<h3>Nach Art</h3>
 <div class="div-by-side">
 
 <div>
@@ -42,23 +54,41 @@
 </div>
 
 <h3>{{ head.bookings }}</h3>
-<table class="table table-sm">
-  {% for year, stat in booking.by_month.items reversed %}
+<table id="by_month_history" class="table table-sm">
+  {% for year, stat in by_month %}
   <tr class="thead">
     <th><h4 class="mb-0">{{ year }}</h4></th>
     <th>∑</th><th>Jan</th><th>Feb</th><th>Mär</th><th>Apr</th><th>Mai</th><th>Jun</th><th>Jul</th><th>Aug</th><th>Sep</th><th>Okt</th><th>Nov</th><th>Dez</th>
   </tr>
+  <tr>
+    <th>Personen</th>
+    {% for sum, count, people in stat %}
+    <td{% if not people %} class="text-gray"{% endif %}>
+      {% if people and not forloop.first %}
+      <a href="{% url 'person:list' %}?created.y={{year}}&created.m={{forloop.counter0}}">{{ people }}</a>
+      {% else %}
+      {{ people }}
+      {% endif %}
+    </td>
+    {% endfor %}
+  </tr>
   <tr>
     <th>Buchungen</th>
-    {% for sum, count in stat %}<td>{{ count }}</td>{% endfor %}
+    {% for sum, count, people in stat %}
+    <td{% if not count %} class="text-gray"{% endif %}>{{ count }}</td>
+    {% endfor %}
   </tr>
   <tr>
     <th>Minuten (ø)</th>
-    {% for sum, count in stat %}<td>{{ sum|divide:count|floatformat:1 }}</td>{% endfor %}
+    {% for sum, count, people in stat %}
+    <td{% if not sum %} class="text-gray"{% endif %}>{{ sum|divide:count|floatformat:1 }}</td>
+    {% endfor %}
   </tr>
   <tr>
     <th>Minuten</th>
-    {% for sum, count in stat %}<td>{{ sum }}</td>{% endfor %}
+    {% for sum, count, people in stat %}
+    <td{% if not sum %} class="text-gray"{% endif %}>{{ sum }}</td>
+    {% endfor %}
   </tr>
   <tr class="blank"></tr>
   {% endfor %}

app/base/views/dashboard.py

@@ -1,8 +1,11 @@
 from django.db.models import Q, F, Sum, Count, ExpressionWrapper, IntegerField
 from django.db.models.functions import Substr
+from django.db.models.lookups import LessThan
 from django.views.generic import TemplateView
 
-from app.base.models import Booking, BookingType, Trait, TraitMapping
+from app.base.models import (
+    Booking, BookingType, CourseVisit, Person, Trait, TraitMapping
+)
 from app.base.views.login import LoginRequired
 from app.base.views.model_views.base import ViewOptions
 
@@ -23,30 +26,20 @@ class DashboardView(DashboardOptions, TemplateView):
         book_types = dict(BookingType.objects.values_list('key', 'label'))
         trait_types = dict(Trait.objects.values_list('key', 'label'))
 
-        # Booking stats
-
-        book_by_type = stats_for_booking('type')
-        book_by_month = {}
-
-        for stat in stats_for_booking('month'):
-            year, month = stat['month'].split('-')
-            if year not in book_by_month:
-                book_by_month[year] = [[0, 0] for x in range(13)]
-            book_by_month[year][0][0] += stat['sum']
-            book_by_month[year][0][1] += stat['count']
-            book_by_month[year][int(month)][0] += stat['sum']
-            book_by_month[year][int(month)][1] += stat['count']
-
         context['booking'] = {
             'labels': book_types,
-            'by_type': book_by_type,
-            'by_month': book_by_month,
+            'by_type': stats_for_booking('type'),
         }
         context['trait'] = {
             'labels': trait_types,
             'by_type': stats_for_traits(),
         }
+        context['person'] = {
+            'by_count': stats_for_person_count(),
+        }
+        context['by_month'] = stats_by_month()
         context['head'] = {
+            'person': Person._meta.verbose_name_plural,
             'bookings': Booking._meta.verbose_name_plural,
             'booking_types': BookingType._meta.verbose_name_plural,
             'traits': Trait._meta.verbose_name_plural,
@@ -55,9 +48,59 @@ class DashboardView(DashboardOptions, TemplateView):
         return context
 
 
+def stats_for_person_count():
+    today = date.today()
+    last_year = today.replace(year=today.year - 1)
+
+    stats = Person.objects.aggregate(
+        total=Count(1),
+        single_visit=Sum(LessThan(
+            # TODO: other DBs dont use microseconds
+            ExpressionWrapper(F('last_visit') - F('created'),
+                              output_field=IntegerField()),
+            3 * 86_400_000_000)),  # 3 days
+        long_not_seen=Sum(Q(last_visit__lt=last_year)),
+    )
+
+    stats['no_booking'] = stats['total'] - Booking.objects.aggregate(
+        c=Count('user', distinct=True))['c']
+    stats['no_course'] = stats['total'] - CourseVisit.objects.aggregate(
+        c=Count('participant', distinct=True))['c']
+
+    return stats
+
+
+def stats_by_month():
+    stats = {}
+
+    for stat in stats_for_person_by_month():
+        year, month = stat['month'].split('-')
+        if year not in stats:
+            stats[year] = [[0, 0, 0] for x in range(13)]
+        stats[year][0][2] += stat['count']
+        stats[year][int(month)][2] += stat['count']
+
+    for stat in stats_for_booking('month'):
+        year, month = stat['month'].split('-')
+        if year not in stats:
+            stats[year] = [[0, 0, 0] for x in range(13)]
+        stats[year][0][0] += stat['sum']
+        stats[year][0][1] += stat['count']
+        stats[year][int(month)][0] += stat['sum']
+        stats[year][int(month)][1] += stat['count']
+
+    return sorted(stats.items(), reverse=True)
+
+
+def stats_for_person_by_month():
+    return Person.objects.values(
+        month=Substr('created', 1, 7),  # YYYY-MM
+    ).annotate(count=Count(1)).order_by('month')
+
+
 def stats_for_booking(groupby: str):
     _Q = Booking.objects.filter(Q(end_time__isnull=False)).annotate(
-        # for whatever reason django uses nano seconds
+        # TODO: other DBs dont use microseconds
         diff=ExpressionWrapper(
             (F('end_time') - F('begin_time')) / 60_000_000,
             output_field=IntegerField()),

app/base/views/model_views/person.py

@@ -33,6 +33,9 @@ class PersonOptions(ViewOptions[Person], LoginRequired):
     list_filter = {
         'trait': 'traits__pk',
         'course': 'courses__pk',
+        'created': 'created',
+        'created.y': 'created__year',
+        'created.m': 'created__month',
     }
     list_columns = ['display_name', 'birth_date', 'last_visit']
     list_render = {