feat(history): add Team filter to /history/ page (and CSV export)

Mirrors the team filter just added to /workers/. WorkLog.team is a
nullable FK, so the filter accepts:
- empty   → all logs (default)
- digit   → logs tagged with that team
- 'none'  → logs with no team set (ad-hoc attendance)

Filter row reflowed to col-md-3 col-lg-2 so all four selects fit on
a single row on wide screens; mobile stacks them. CSV export link
now passes &team=… through. Supervisors only see teams they
supervise in the dropdown.

4 regression tests covering filter narrowing, no-team match,
empty=show-all, and filter_params round-trip for the List/Calendar
toggle links.

core/templates/core/work_history.html

@@ -27,7 +27,7 @@
                     <i class="fas fa-calendar-alt me-1"></i> Calendar
                 </a>
             </div>
-            <a href="{% url 'export_work_log_csv' %}?worker={{ selected_worker }}&project={{ selected_project }}&status={{ selected_status }}"
+            <a href="{% url 'export_work_log_csv' %}?worker={{ selected_worker }}&project={{ selected_project }}&team={{ selected_team }}&status={{ selected_status }}"
                class="btn btn-outline-secondary btn-sm">
                 <i class="fas fa-file-csv me-1"></i> Export CSV
             </a>
@@ -47,7 +47,7 @@
                 <input type="hidden" name="month" value="{{ curr_month }}">
                 {% endif %}
 
-                <div class="col-md-3">
+                <div class="col-md-3 col-lg-2">
                     <label class="form-label">Worker</label>
                     <select name="worker" class="form-select form-select-sm">
                         <option value="">All Workers</option>
@@ -57,7 +57,7 @@
                     </select>
                 </div>
 
-                <div class="col-md-3">
+                <div class="col-md-3 col-lg-2">
                     <label class="form-label">Project</label>
                     <select name="project" class="form-select form-select-sm">
                         <option value="">All Projects</option>
@@ -67,7 +67,20 @@
                     </select>
                 </div>
 
-                <div class="col-md-3">
+                {# === Team filter === #}
+                {# WorkLog.team is a nullable FK; 'none' filters logs whose team is null. #}
+                <div class="col-md-3 col-lg-2">
+                    <label class="form-label">Team</label>
+                    <select name="team" class="form-select form-select-sm">
+                        <option value="">All Teams</option>
+                        <option value="none" {% if selected_team == 'none' %}selected{% endif %}>— No team —</option>
+                        {% for t in filter_teams %}
+                        <option value="{{ t.id }}" {% if selected_team == t.id|stringformat:"d" %}selected{% endif %}>{{ t.name }}</option>
+                        {% endfor %}
+                    </select>
+                </div>
+
+                <div class="col-md-3 col-lg-2">
                     <label class="form-label">Payment Status</label>
                     <select name="status" class="form-select form-select-sm">
                         <option value="" {% if not selected_status %}selected{% endif %}>All</option>
@@ -76,7 +89,7 @@
                     </select>
                 </div>
 
-                <div class="col-md-3 d-flex gap-2">
+                <div class="col-md-12 col-lg-4 d-flex gap-2 align-items-end">
                     <button type="submit" class="btn btn-sm btn-accent">
                         <i class="fas fa-filter me-1"></i> Filter
                     </button>

core/tests.py

@@ -2939,3 +2939,73 @@ class WorkerListTeamFilterTests(TestCase):
         self.assertContains(resp, 'No team assigned')
         self.assertContains(resp, 'Alpha Team')
         self.assertContains(resp, 'Bravo Team')
+
+
+class WorkHistoryTeamFilterTests(TestCase):
+    """The /history/ page accepts ?team=<id> to narrow to logs tagged
+    with that team, ?team=none for logs with no team set, and empty
+    for all logs (default)."""
+
+    @classmethod
+    def setUpTestData(cls):
+        cls.admin = User.objects.create_user(
+            username='admin', password='pw', is_staff=True, is_superuser=True,
+        )
+        cls.project = Project.objects.create(name='Solar Farm Alpha')
+        cls.worker = Worker.objects.create(
+            name='Alpha Worker', id_number='AW1', monthly_salary=Decimal('6000'),
+        )
+        cls.team_a = Team.objects.create(name='Alpha Crew', supervisor=cls.admin)
+        cls.team_b = Team.objects.create(name='Bravo Crew', supervisor=cls.admin)
+        cls.team_a.workers.add(cls.worker)
+        cls.team_b.workers.add(cls.worker)
+
+        cls.log_a = WorkLog.objects.create(
+            date=_date(2026, 5, 10), project=cls.project,
+            team=cls.team_a, supervisor=cls.admin,
+        )
+        cls.log_a.workers.add(cls.worker)
+
+        cls.log_b = WorkLog.objects.create(
+            date=_date(2026, 5, 11), project=cls.project,
+            team=cls.team_b, supervisor=cls.admin,
+        )
+        cls.log_b.workers.add(cls.worker)
+
+        # Log with no team — ad-hoc attendance
+        cls.log_none = WorkLog.objects.create(
+            date=_date(2026, 5, 12), project=cls.project,
+            team=None, supervisor=cls.admin,
+        )
+        cls.log_none.workers.add(cls.worker)
+
+    def setUp(self):
+        self.client.force_login(self.admin)
+
+    def test_team_filter_narrows_to_team(self):
+        resp = self.client.get(f'/history/?team={self.team_a.id}')
+        log_ids = [l.id for l in resp.context['logs']]
+        self.assertIn(self.log_a.id, log_ids)
+        self.assertNotIn(self.log_b.id, log_ids)
+        self.assertNotIn(self.log_none.id, log_ids)
+
+    def test_team_filter_none_shows_logs_with_no_team(self):
+        resp = self.client.get('/history/?team=none')
+        log_ids = [l.id for l in resp.context['logs']]
+        self.assertNotIn(self.log_a.id, log_ids)
+        self.assertNotIn(self.log_b.id, log_ids)
+        self.assertIn(self.log_none.id, log_ids)
+
+    def test_team_filter_empty_shows_all(self):
+        resp = self.client.get('/history/')
+        log_ids = [l.id for l in resp.context['logs']]
+        self.assertIn(self.log_a.id, log_ids)
+        self.assertIn(self.log_b.id, log_ids)
+        self.assertIn(self.log_none.id, log_ids)
+
+    def test_team_filter_propagates_to_filter_params(self):
+        """selected_team round-trips correctly into filter_params for
+        the List/Calendar toggle links."""
+        resp = self.client.get(f'/history/?team={self.team_a.id}')
+        self.assertIn(f'team={self.team_a.id}', resp.context['filter_params'])
+        self.assertEqual(resp.context['selected_team'], str(self.team_a.id))

core/views.py

@@ -887,9 +887,12 @@ def work_history(request):
     # Validate numeric params to prevent 500 errors from bad/malformed URLs.
     worker_filter = request.GET.get('worker', '')
     project_filter = request.GET.get('project', '')
+    team_filter = (request.GET.get('team', '') or '').strip()
     status_filter = request.GET.get('status', '')
 
-    # Validate: worker and project must be numeric IDs (or empty)
+    # Validate: worker and project must be numeric IDs (or empty).
+    # team_filter is left as a raw string so we can also accept 'none'
+    # (meaning "logs with no team assigned"); the digit check happens below.
     try:
         worker_filter = str(int(worker_filter)) if worker_filter else ''
     except (ValueError, TypeError):
@@ -908,6 +911,17 @@ def work_history(request):
     if project_filter:
         logs = logs.filter(project__id=project_filter)
 
+    # === Team filter ===
+    # WorkLog.team is a nullable FK — some logs were created without
+    # picking a team (e.g. ad-hoc attendance). 'none' is the special
+    # value matching those. A numeric value matches the team's PK.
+    if team_filter == 'none':
+        logs = logs.filter(team__isnull=True)
+    elif team_filter.isdigit():
+        logs = logs.filter(team_id=int(team_filter))
+    else:
+        team_filter = ''  # treat garbage input as no filter
+
     if status_filter == 'paid':
         # "Paid" = has at least one PayrollRecord linked
         logs = logs.filter(payroll_records__isnull=False).distinct()
@@ -916,7 +930,7 @@ def work_history(request):
         logs = logs.filter(payroll_records__isnull=True)
 
     # Track whether any filter is active (for showing feedback in the template)
-    has_active_filters = bool(worker_filter or project_filter or status_filter)
+    has_active_filters = bool(worker_filter or project_filter or team_filter or status_filter)
 
     # Count filtered results BEFORE adding joins (more efficient SQL)
     filtered_log_count = logs.count() if has_active_filters else 0
@@ -936,6 +950,7 @@ def work_history(request):
     if is_admin(user):
         filter_workers = Worker.objects.filter(active=True).order_by('name')
         filter_projects = Project.objects.filter(active=True).order_by('name')
+        filter_teams = Team.objects.filter(active=True).order_by('name')
     else:
         supervised_teams = Team.objects.filter(supervisor=user, active=True)
         filter_workers = Worker.objects.filter(
@@ -944,6 +959,8 @@ def work_history(request):
         filter_projects = Project.objects.filter(
             active=True, supervisors=user
         ).order_by('name')
+        # Supervisors see only the teams they actually supervise in the filter.
+        filter_teams = supervised_teams.order_by('name')
 
     # --- View mode: list or calendar ---
     view_mode = request.GET.get('view', 'list')
@@ -956,6 +973,8 @@ def work_history(request):
         filter_params += '&worker=' + worker_filter
     if project_filter:
         filter_params += '&project=' + project_filter
+    if team_filter:
+        filter_params += '&team=' + team_filter
     if status_filter:
         filter_params += '&status=' + status_filter
 
@@ -963,8 +982,10 @@ def work_history(request):
         'logs': logs,
         'filter_workers': filter_workers,
         'filter_projects': filter_projects,
+        'filter_teams': filter_teams,
         'selected_worker': worker_filter,
         'selected_project': project_filter,
+        'selected_team': team_filter,
         'selected_status': status_filter,
         'is_admin': is_admin(user),
         'view_mode': view_mode,
@@ -1297,12 +1318,18 @@ def export_work_log_csv(request):
 
     worker_filter = request.GET.get('worker', '')
     project_filter = request.GET.get('project', '')
+    team_filter = (request.GET.get('team', '') or '').strip()
     status_filter = request.GET.get('status', '')
 
     if worker_filter:
         logs = logs.filter(workers__id=worker_filter).distinct()
     if project_filter:
         logs = logs.filter(project__id=project_filter)
+    # Mirror the team-filter semantics from work_history: 'none' = no team.
+    if team_filter == 'none':
+        logs = logs.filter(team__isnull=True)
+    elif team_filter.isdigit():
+        logs = logs.filter(team_id=int(team_filter))
     if status_filter == 'paid':
         logs = logs.filter(payroll_records__isnull=False).distinct()
     elif status_filter == 'unpaid':