.docker/extra_requirements.txt

-uwsgi==2.0.25.1
+uwsgi==2.0.29

.gitlab-ci.yml

-image: python:3.9
+image: python:3.11
 
 services:
   - mysql
@@ -26,10 +26,9 @@ cache:
     - pip install pylint-gitlab pylint-django
     - mysql --version
 
-check:
+migrations:
   extends: .before_script_template
   script:
-    - ./Utils/check.sh --all
     - source venv/bin/activate
     - ./manage.py makemigrations --dry-run --check
 
@@ -38,7 +37,7 @@ test:
   script:
     - source venv/bin/activate
     - echo "GRANT ALL on *.* to '${MYSQL_USER}';"| mysql -u root --password="${MYSQL_ROOT_PASSWORD}" -h mysql
-    - pip install pytest-cov unittest-xml-reporting
+    - pip install pytest-cov
     - coverage run --source='.' manage.py test --settings AKPlanning.settings_ci
   after_script:
     - source venv/bin/activate

AKDashboard/tests.py

 import zoneinfo
+
 from django.apps import apps
-from django.test import TestCase, override_settings
+from django.test import override_settings, TestCase
 from django.urls import reverse
 from django.utils.timezone import now
 
 from AKDashboard.models import DashboardButton
-from AKModel.models import Event, AK, AKCategory
-from AKModel.tests import BasicViewTests
+from AKModel.models import AK, AKCategory, Event
+from AKModel.tests.test_views import BasicViewTests
 
 
 class DashboardTests(TestCase):
     """
     Specific Dashboard Tests
     """
+
     @classmethod
     def setUpTestData(cls):
         """
@@ -20,17 +22,17 @@ class DashboardTests(TestCase):
         """
         super().setUpTestData()
         cls.event = Event.objects.create(
-            name="Dashboard Test Event",
-            slug="dashboardtest",
-            timezone=zoneinfo.ZoneInfo("Europe/Berlin"),
-            start=now(),
-            end=now(),
-            active=True,
-            plan_hidden=False,
+                name="Dashboard Test Event",
+                slug="dashboardtest",
+                timezone=zoneinfo.ZoneInfo("Europe/Berlin"),
+                start=now(),
+                end=now(),
+                active=True,
+                plan_hidden=False,
         )
         cls.default_category = AKCategory.objects.create(
-            name="Test Category",
-            event=cls.event,
+                name="Test Category",
+                event=cls.event,
         )
 
     def test_dashboard_view(self):
@@ -62,12 +64,12 @@ class DashboardTests(TestCase):
 
         # History should be empty
         response = self.client.get(url)
-        self.assertQuerysetEqual(response.context["recent_changes"], [])
+        self.assertQuerySetEqual(response.context["recent_changes"], [])
 
         AK.objects.create(
-            name="Test AK",
-            category=self.default_category,
-            event=self.event,
+                name="Test AK",
+                category=self.default_category,
+                event=self.event,
         )
 
         # History should now contain one AK (Test AK)
@@ -154,8 +156,8 @@ class DashboardTests(TestCase):
         self.assertNotContains(response, "Dashboard Button Test")
 
         DashboardButton.objects.create(
-            text="Dashboard Button Test",
-            event=self.event
+                text="Dashboard Button Test",
+                event=self.event
         )
 
         response = self.client.get(url_event_dashboard)

AKModel/admin.py

@@ -2,6 +2,8 @@ from django import forms
 from django.apps import apps
 from django.contrib import admin, messages
 from django.contrib.admin import SimpleListFilter, RelatedFieldListFilter, action, display
+from django.contrib.auth.admin import UserAdmin as BaseUserAdmin
+from django.contrib.auth.models import User # pylint: disable=E5142
 from django.db.models import Count, F
 from django.http import HttpResponseRedirect
 from django.shortcuts import render, redirect
@@ -15,7 +17,7 @@ from simple_history.admin import SimpleHistoryAdmin
 from AKModel.availability.models import Availability
 from AKModel.forms import RoomFormWithAvailabilities
 from AKModel.models import Event, AKOwner, AKCategory, AKTrack, AKRequirement, AK, AKSlot, Room, AKOrgaMessage, \
-    ConstraintViolation, DefaultSlot, AKType
+    ConstraintViolation, DefaultSlot, AKType, EventParticipant, AKPreference
 from AKModel.urls import get_admin_urls_event_wizard, get_admin_urls_event
 from AKModel.views.ak import AKResetInterestView, AKResetInterestCounterView
 from AKModel.views.manage import CVMarkResolvedView, CVSetLevelViolationView, CVSetLevelWarningView
@@ -568,3 +570,85 @@ class DefaultSlotAdmin(EventTimezoneFormMixin, admin.ModelAdmin):
     list_display = ['start_simplified', 'end_simplified', 'event']
     list_filter = ['event']
     form = DefaultSlotAdminForm
+
+
+@admin.register(EventParticipant)
+class EventParticipantAdmin(PrepopulateWithNextActiveEventMixin, admin.ModelAdmin):
+    """
+    Admin interface for EventParticipant
+    """
+    model = EventParticipant
+    list_display = ['name', 'institution', 'event']
+    list_filter = ['event', 'institution']
+    list_editable = []
+    ordering = ['name']
+
+
+class AKPreferenceAdminForm(forms.ModelForm):
+    """
+    Adapted admin form for AK preferences for usage in :class:`AKPreferenceAdmin`)
+    """
+    class Meta:
+        widgets = {
+            'participant': forms.Select,
+            'slot': forms.Select,
+        }
+
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        # Filter possible values for foreign keys & m2m when event is specified
+        if hasattr(self.instance, "event") and self.instance.event is not None:
+            self.fields["participant"].queryset = EventParticipant.objects.filter(event=self.instance.event)
+            self.fields["slot"].queryset = AKSlot.objects.filter(event=self.instance.event)
+
+
+@admin.register(AKPreference)
+class AKPreferenceAdmin(PrepopulateWithNextActiveEventMixin, admin.ModelAdmin):
+    """
+    Admin interface for AK preferences.
+    Uses an adapted form (see :class:`AKPreferenceAdminForm`)
+    """
+    model = AKPreference
+    form = AKPreferenceAdminForm
+    list_display = ['preference', 'participant', 'slot', 'event']
+    list_filter = ['event', 'slot', 'participant']
+    list_editable = []
+    ordering = ['participant', 'preference', 'slot']
+
+
+# Define a new User admin
+class UserAdmin(BaseUserAdmin):
+    """
+    Admin interface for Users
+    Enhances the built-in UserAdmin with additional actions to activate and deactivate users and a custom selection
+    of displayed properties in overview list
+    """
+    list_display = ["username", "email", "is_active", "is_staff", "is_superuser"]
+    actions = ['activate', 'deactivate']
+
+    @admin.action(description=_("Activate selected users"))
+    def activate(self, request, queryset):
+        """
+        Bulk activate users
+
+        :param request: HTTP request
+        :param queryset: queryset containing all users that should be activated
+        """
+        queryset.update(is_active=True)
+        self.message_user(request, _("The selected users have been activated."))
+
+    @admin.action(description=_("Deactivate selected users"))
+    def deactivate(self, request, queryset):
+        """
+        Bulk deactivate users
+
+        :param request: HTTP request
+        :param queryset: queryset containing all users that should be deactivated
+        """
+        queryset.update(is_active=False)
+        self.message_user(request, _("The selected users have been deactivated."))
+
+
+# Re-register UserAdmin
+admin.site.unregister(User)
+admin.site.register(User, UserAdmin)

AKModel/availability/forms.py

@@ -183,7 +183,7 @@ class AvailabilitiesFormMixin(forms.Form):
         for avail in availabilities:
             setattr(avail, reference_name, instance.id)
 
-    def _replace_availabilities(self, instance, availabilities: [Availability]):
+    def _replace_availabilities(self, instance, availabilities: list[Availability]):
         """
         Replace the existing list of availabilities belonging to an entity with a new, updated one
 

AKModel/availability/models.py

@@ -10,7 +10,7 @@ from django.db import models
 from django.utils.functional import cached_property
 from django.utils.translation import gettext_lazy as _
 
-from AKModel.models import Event, AKOwner, Room, AK, AKCategory
+from AKModel.models import Event, AKOwner, Room, AK, AKCategory, EventParticipant
 
 zero_time = datetime.time(0, 0)
 
@@ -24,6 +24,7 @@ zero_time = datetime.time(0, 0)
 # enable availabilities for AKs and AKCategories
 # add verbose names and help texts to model attributes
 # adapt or extemd documentation
+# add participants
 
 
 class Availability(models.Model):
@@ -79,20 +80,48 @@ class Availability(models.Model):
         verbose_name=_('AK Category'),
         help_text=_('AK Category whose availability this is'),
     )
+    participant = models.ForeignKey(
+        to=EventParticipant,
+        related_name='availabilities',
+        on_delete=models.CASCADE,
+        null=True,
+        blank=True,
+        verbose_name=_('Participant'),
+        help_text=_('Participant whose availability this is'),
+    )
     start = models.DateTimeField()
     end = models.DateTimeField()
 
     def __str__(self) -> str:
         person = self.person.name if self.person else None
+        participant = self.participant.name if self.participant else None
         room = getattr(self.room, 'name', None)
         event = getattr(getattr(self, 'event', None), 'name', None)
         ak = getattr(self.ak, 'name', None)
         ak_category = getattr(self.ak_category, 'name', None)
-        return f'Availability(event={event}, person={person}, room={room}, ak={ak}, ak category={ak_category})'
+        arg_list = [
+            f"event={event}",
+            f"person={person}",
+            f"room={room}",
+            f"ak={ak}",
+            f"ak category={ak_category}",
+            f"participant={participant}",
+        ]
+        return f'Availability({", ".join(arg_list)})'
 
     def __hash__(self):
         return hash(
-            (getattr(self, 'event', None), self.person, self.room, self.ak, self.ak_category, self.start, self.end))
+            (
+                getattr(self, 'event', None),
+                self.person,
+                self.room,
+                self.ak,
+                self.ak_category,
+                self.participant,
+                self.start,
+                self.end,
+            )
+        )
 
     def __eq__(self, other: 'Availability') -> bool:
         """Comparisons like ``availability1 == availability2``.
@@ -103,7 +132,7 @@ class Availability(models.Model):
         return all(
             (
                 getattr(self, attribute, None) == getattr(other, attribute, None)
-                for attribute in ['event', 'person', 'room', 'ak', 'ak_category', 'start', 'end']
+                for attribute in ['event', 'person', 'room', 'ak', 'ak_category', 'participant', 'start', 'end']
             )
         )
 
@@ -151,9 +180,12 @@ class Availability(models.Model):
         if not other.overlaps(self, strict=False):
             raise Exception('Only overlapping Availabilities can be merged.')
 
-        return Availability(
+        avail = Availability(
             start=min(self.start, other.start), end=max(self.end, other.end)
         )
+        if self.event == other.event:
+            avail.event = self.event
+        return avail
 
     def __or__(self, other: 'Availability') -> 'Availability':
         """Performs the merge operation: ``availability1 | availability2``"""
@@ -168,9 +200,12 @@ class Availability(models.Model):
         if not other.overlaps(self, False):
             raise Exception('Only overlapping Availabilities can be intersected.')
 
-        return Availability(
+        avail = Availability(
             start=max(self.start, other.start), end=min(self.end, other.end)
         )
+        if self.event == other.event:
+            avail.event = self.event
+        return avail
 
     def __and__(self, other: 'Availability') -> 'Availability':
         """Performs the intersect operation: ``availability1 &
@@ -247,7 +282,15 @@ class Availability(models.Model):
                 f'{self.end.astimezone(self.event.timezone).strftime("%a %H:%M")}')
 
     @classmethod
-    def with_event_length(cls, event, person=None, room=None, ak=None, ak_category=None):
+    def with_event_length(
+        cls,
+        event: Event,
+        person: AKOwner | None = None,
+        room: Room | None = None,
+        ak: AK | None = None,
+        ak_category: AKCategory | None = None,
+        participant: EventParticipant | None = None,
+    ) -> "Availability":
         """
         Create an availability covering exactly the time between event start and event end.
         Can e.g., be used to create default availabilities.
@@ -265,7 +308,31 @@ class Availability(models.Model):
         timeframe_end = event.end  # adapt to our event model
         timeframe_end = timeframe_end + datetime.timedelta(days=1)
         return Availability(start=timeframe_start, end=timeframe_end, event=event, person=person,
-                                    room=room, ak=ak, ak_category=ak_category)
+                                    room=room, ak=ak, ak_category=ak_category, participant=participant)
+
+    def is_covered(self, availabilities: List['Availability']):
+        """Check if list of availibilities cover this object.
+
+        :param availabilities: availabilities to check.
+        :return: whether the availabilities cover full event.
+        :rtype: bool
+        """
+        avail_union = Availability.union(availabilities)
+        return any(avail.contains(self) for avail in avail_union)
+
+    @classmethod
+    def is_event_covered(cls, event: Event, availabilities: List['Availability']) -> bool:
+        """Check if list of availibilities cover whole event.
+
+        :param event: event to check.
+        :param availabilities: availabilities to check.
+        :return: whether the availabilities cover full event.
+        :rtype: bool
+        """
+        # NOTE: Cannot use `Availability.with_event_length` as its end is the
+        #       event end + 1 day
+        full_event = Availability(event=event, start=event.start, end=event.end)
+        return full_event.is_covered(availabilities)
 
     class Meta:
         verbose_name = _('Availability')

AKModel/fixtures/model.json

@@ -93,7 +93,7 @@
     "model": "AKModel.akcategory",
     "pk": 1,
     "fields": {
-        "name": "Spa▀",
+        "name": "Spaß",
         "color": "275246",
         "description": "",
         "present_by_default": true,
@@ -115,7 +115,7 @@
     "model": "AKModel.akcategory",
     "pk": 3,
     "fields": {
-        "name": "Spa▀/Kultur",
+        "name": "Spaß/Kultur",
         "color": "333333",
         "description": "",
         "present_by_default": true,
@@ -214,7 +214,6 @@
         "reso": false,
         "present": true,
         "notes": "",
-        "interest": -1,
         "category": 4,
         "track": null,
         "event": 2,
@@ -237,7 +236,6 @@
         "reso": false,
         "present": true,
         "notes": "",
-        "interest": -1,
         "category": 4,
         "track": null,
         "event": 2,
@@ -260,7 +258,6 @@
         "reso": false,
         "present": null,
         "notes": "",
-        "interest": -1,
         "category": 5,
         "track": null,
         "event": 2,
@@ -283,7 +280,6 @@
         "reso": false,
         "present": null,
         "notes": "",
-        "interest": -1,
         "category": 5,
         "track": null,
         "event": 2,
@@ -306,7 +302,6 @@
         "reso": false,
         "present": null,
         "notes": "We need to find a volunteer first...",
-        "interest": -1,
         "category": 3,
         "track": null,
         "event": 2,
@@ -329,7 +324,6 @@
         "reso": false,
         "present": null,
         "notes": "We need to find a volunteer first...",
-        "interest": -1,
         "category": 3,
         "track": null,
         "event": 2,
@@ -352,7 +346,6 @@
         "reso": false,
         "present": null,
         "notes": "",
-        "interest": -1,
         "category": 5,
         "track": 1,
         "event": 2,
@@ -444,6 +437,62 @@
         ]
     }
 },
+{
+    "model": "AKModel.ak",
+    "pk": 4,
+    "fields": {
+        "name": "Test AK fixed slots",
+        "short_name": "testfixed",
+        "description": "",
+        "link": "",
+        "protocol_link": "",
+        "category": 4,
+        "track": null,
+        "reso": false,
+        "present": true,
+        "notes": "",
+        "interest": -1,
+        "interest_counter": 0,
+        "include_in_export": false,
+        "event": 2,
+        "owners": [
+            1
+        ],
+        "requirements": [
+            3
+        ],
+        "conflicts": [],
+        "prerequisites": []
+    }
+},
+{
+    "model": "AKModel.ak",
+    "pk": 5,
+    "fields": {
+        "name": "Test AK Ernst",
+        "short_name": "testernst",
+        "description": "",
+        "link": "",
+        "protocol_link": "",
+        "category": 2,
+        "track": null,
+        "reso": false,
+        "present": true,
+        "notes": "",
+        "interest": -1,
+        "interest_counter": 0,
+        "include_in_export": false,
+        "event": 1,
+        "owners": [
+            3
+        ],
+        "requirements": [
+            2
+        ],
+        "conflicts": [],
+        "prerequisites": []
+    }
+},
 {
     "model": "AKModel.room",
     "pk": 1,
@@ -468,6 +517,19 @@
         "properties": []
     }
 },
+{
+    "model": "AKModel.room",
+    "pk": 3,
+    "fields": {
+        "name": "BBB Session 1",
+        "location": "",
+        "capacity": -1,
+        "event": 1,
+        "properties": [
+            2
+        ]
+    }
+},
 {
     "model": "AKModel.akslot",
     "pk": 1,
@@ -533,6 +595,58 @@
         "updated": "2022-12-02T12:23:11.856Z"
     }
 },
+{
+    "model": "AKModel.akslot",
+    "pk": 6,
+    "fields": {
+        "ak": 4,
+        "room": null,
+        "start": "2020-11-08T18:30:00Z",
+        "duration": "2.00",
+        "fixed": true,
+        "event": 2,
+        "updated": "2022-12-02T12:23:11.856Z"
+    }
+},
+{
+    "model": "AKModel.akslot",
+    "pk": 7,
+    "fields": {
+        "ak": 4,
+        "room": 2,
+        "start": null,
+        "duration": "2.00",
+        "fixed": true,
+        "event": 2,
+        "updated": "2022-12-02T12:23:11.856Z"
+    }
+},
+{
+    "model": "AKModel.akslot",
+    "pk": 8,
+    "fields": {
+        "ak": 4,
+        "room": 2,
+        "start": "2020-11-07T16:00:00Z",
+        "duration": "2.00",
+        "fixed": true,
+        "event": 2,
+        "updated": "2022-12-02T12:23:11.856Z"
+    }
+},
+{
+    "model": "AKModel.akslot",
+    "pk": 9,
+    "fields": {
+        "ak": 5,
+        "room": null,
+        "start": null,
+        "duration": "2.00",
+        "fixed": false,
+        "event": 1,
+        "updated": "2022-12-02T12:23:11.856Z"
+    }
+},
 {
     "model": "AKModel.constraintviolation",
     "pk": 1,
@@ -676,5 +790,71 @@
         "start": "2020-11-07T18:30:00Z",
         "end": "2020-11-07T21:30:00Z"
     }
+},
+{
+    "model": "AKModel.availability",
+    "pk": 7,
+    "fields": {
+        "event": 1,
+        "person": null,
+        "room": null,
+        "ak": 5,
+        "ak_category": null,
+        "start": "2020-10-01T17:41:22Z",
+        "end": "2020-10-04T17:41:30Z"
+    }
+},
+{
+    "model": "AKModel.availability",
+    "pk": 8,
+    "fields": {
+        "event": 1,
+        "person": null,
+        "room": 3,
+        "ak": null,
+        "ak_category": null,
+        "start": "2020-10-01T17:41:22Z",
+        "end": "2020-10-04T17:41:30Z"
+    }
+},
+{
+    "model": "AKModel.defaultslot",
+    "pk": 1,
+    "fields": {
+        "event": 2,
+        "start": "2020-11-07T08:00:00Z",
+        "end": "2020-11-07T12:00:00Z",
+        "primary_categories": [5]
+    }
+},
+{
+    "model": "AKModel.defaultslot",
+    "pk": 2,
+    "fields": {
+        "event": 2,
+        "start": "2020-11-07T14:00:00Z",
+        "end": "2020-11-07T17:00:00Z",
+        "primary_categories": [4]
+    }
+},
+{
+    "model": "AKModel.defaultslot",
+    "pk": 3,
+    "fields": {
+        "event": 2,
+        "start": "2020-11-08T08:00:00Z",
+        "end": "2020-11-08T19:00:00Z",
+        "primary_categories": [4, 5]
+    }
+},
+{
+    "model": "AKModel.defaultslot",
+    "pk": 4,
+    "fields": {
+        "event": 2,
+        "start": "2020-11-09T17:00:00Z",
+        "end": "2020-11-10T01:00:00Z",
+        "primary_categories": [4, 5, 3]
+    }
 }
 ]

AKModel/forms.py

@@ -4,13 +4,17 @@ Central and admin forms
 
 import csv
 import io
+import json
 
 from django import forms
+from django.core.exceptions import ValidationError
 from django.forms.utils import ErrorList
 from django.utils.translation import gettext_lazy as _
+from jsonschema.exceptions import best_match
 
 from AKModel.availability.forms import AvailabilitiesFormMixin
 from AKModel.models import Event, AKCategory, AKRequirement, Room, AKType
+from AKModel.utils import construct_schema_validator
 
 
 class DateTimeInput(forms.DateInput):
@@ -281,3 +285,88 @@ class RoomFormWithAvailabilities(AvailabilitiesFormMixin, RoomForm):
         # Filter possible values for m2m when event is specified
         if hasattr(self.instance, "event") and self.instance.event is not None:
             self.fields["properties"].queryset = AKRequirement.objects.filter(event=self.instance.event)
+
+
+class JSONScheduleImportForm(AdminIntermediateForm):
+    """Form to import an AK schedule from a json file."""
+    json_data = forms.CharField(
+        required=False,
+        widget=forms.Textarea,
+        label=_("JSON data"),
+        help_text=_("JSON data from the scheduling solver"),
+    )
+
+    json_file = forms.FileField(
+        required=False,
+        label=_("File with JSON data"),
+        help_text=_("File with JSON data from the scheduling solver"),
+    )
+
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        self.json_schema_validator = construct_schema_validator(
+            schema="solver-output.schema.json"
+        )
+
+    def _check_json_data(self, data: str):
+        """Validate `data` against our JSON schema.
+
+        :param data: The JSON string to validate using `self.json_schema_validator`.
+        :type data: str
+        :raises ValidationError: if the validation fails, with a description of the cause.
+        :return: The parsed JSON dict, if validation is successful.
+        """
+        try:
+            schedule = json.loads(data)
+        except json.JSONDecodeError as ex:
+            raise ValidationError(_("Cannot decode as JSON"), "invalid") from ex
+
+        error = best_match(self.json_schema_validator.iter_errors(schedule))
+        if error:
+            raise ValidationError(
+                _("Invalid JSON format: %(msg)s at %(error_path)s"),
+                "invalid",
+                params={
+                    "msg": error.message,
+                    "error_path": error.json_path
+                }
+            ) from error
+
+        return schedule
+
+    def clean(self):
+        """Extract and validate entered JSON data.
+
+        We allow entering of the schedule from two sources:
+        1. from an uploaded file
+        2. from a text field.
+
+        This function checks that data is entered from exactly one source.
+        If so, the entered JSON string is validated against our schema.
+        Any errors are reported at the corresponding form field.
+        """
+        cleaned_data = super().clean()
+        if cleaned_data.get("json_file") and cleaned_data.get("json_data"):
+            err = ValidationError(
+                _("Please enter data as a file OR via text, not both."), "invalid"
+            )
+            self.add_error("json_data", err)
+            self.add_error("json_file", err)
+        elif not (cleaned_data.get("json_file") or cleaned_data.get("json_data")):
+            err = ValidationError(
+                _("No data entered. Please enter data as a file or via text."), "invalid"
+            )
+            self.add_error("json_data", err)
+            self.add_error("json_file", err)
+        else:
+            source_field = "json_data"
+            data = cleaned_data.get(source_field)
+            if not data:
+                source_field = "json_file"
+                with cleaned_data.get(source_field).open() as ff:
+                    data = ff.read()
+            try:
+                cleaned_data["data"] = self._check_json_data(data)
+            except ValidationError as ex:
+                self.add_error(source_field, ex)
+        return cleaned_data

AKModel/locale/de_DE/LC_MESSAGES/django.po

@@ -2,7 +2,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: PACKAGE VERSION\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2025-02-25 22:33+0100\n"
+"POT-Creation-Date: 2025-03-03 20:47+0100\n"
 "PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
 "Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
 "Language-Team: LANGUAGE <LL@li.org>\n"
@@ -11,7 +11,7 @@ msgstr ""
 "Content-Type: text/plain; charset=UTF-8\n"
 "Content-Transfer-Encoding: 8bit\n"
 
-#: AKModel/admin.py:86 AKModel/admin.py:96
+#: AKModel/admin.py:88 AKModel/admin.py:98
 #: AKModel/templates/admin/AKModel/event_wizard/activate.html:35
 #: AKModel/templates/admin/AKModel/event_wizard/created_prepare_import.html:51
 #: AKModel/templates/admin/AKModel/event_wizard/finish.html:21
@@ -21,69 +21,85 @@ msgstr ""
 msgid "Status"
 msgstr "Status"
 
-#: AKModel/admin.py:98
+#: AKModel/admin.py:100
 msgid "Toggle plan visibility"
 msgstr "Plansichtbarkeit ändern"
 
-#: AKModel/admin.py:110 AKModel/admin.py:121 AKModel/views/manage.py:138
+#: AKModel/admin.py:112 AKModel/admin.py:123 AKModel/views/manage.py:138
 msgid "Publish plan"
 msgstr "Plan veröffentlichen"
 
-#: AKModel/admin.py:113 AKModel/admin.py:129 AKModel/views/manage.py:151
+#: AKModel/admin.py:115 AKModel/admin.py:131 AKModel/views/manage.py:151
 msgid "Unpublish plan"
 msgstr "Plan verbergen"
 
-#: AKModel/admin.py:168 AKModel/models.py:381 AKModel/models.py:707
+#: AKModel/admin.py:170 AKModel/models.py:396 AKModel/models.py:736
 #: AKModel/templates/admin/AKModel/aks_by_user.html:12
 #: AKModel/templates/admin/AKModel/status/event_aks.html:10
 #: AKModel/views/manage.py:73 AKModel/views/status.py:102
 msgid "AKs"
 msgstr "AKs"
 
-#: AKModel/admin.py:234
+#: AKModel/admin.py:236
 msgid "Wish"
 msgstr "AK-Wunsch"
 
-#: AKModel/admin.py:240
+#: AKModel/admin.py:242
 msgid "Is wish"
 msgstr "Ist ein Wunsch"
 
-#: AKModel/admin.py:241
+#: AKModel/admin.py:243
 msgid "Is not a wish"
 msgstr "Ist kein Wunsch"
 
-#: AKModel/admin.py:301
+#: AKModel/admin.py:303
 msgid "Export to wiki syntax"
 msgstr "In Wiki-Syntax exportieren"
 
-#: AKModel/admin.py:318
+#: AKModel/admin.py:320
 msgid "Cannot export AKs from more than one event at the same time."
 msgstr "Kann nicht AKs von mehreren Events zur selben Zeit exportieren."
 
-#: AKModel/admin.py:333 AKModel/views/ak.py:99
+#: AKModel/admin.py:335 AKModel/views/ak.py:99
 msgid "Reset interest in AKs"
 msgstr "Interesse an AKs zurücksetzen"
 
-#: AKModel/admin.py:343 AKModel/views/ak.py:114
+#: AKModel/admin.py:345 AKModel/views/ak.py:114
 msgid "Reset AKs' interest counters"
 msgstr "Interessenszähler der AKs zurücksetzen"
 
-#: AKModel/admin.py:442 AKModel/admin.py:456
+#: AKModel/admin.py:444 AKModel/admin.py:458
 msgid "AK Details"
 msgstr "AK-Details"
 
-#: AKModel/admin.py:518 AKModel/views/manage.py:99
+#: AKModel/admin.py:520 AKModel/views/manage.py:99
 msgid "Mark Constraint Violations as manually resolved"
 msgstr "Markiere Constraintverletzungen als manuell behoben"
 
-#: AKModel/admin.py:527 AKModel/views/manage.py:112
+#: AKModel/admin.py:529 AKModel/views/manage.py:112
 msgid "Set Constraint Violations to level \"violation\""
 msgstr "Constraintverletzungen auf Level \"Violation\" setzen"
 
-#: AKModel/admin.py:536 AKModel/views/manage.py:125
+#: AKModel/admin.py:538 AKModel/views/manage.py:125
 msgid "Set Constraint Violations to level \"warning\""
 msgstr "Constraintverletzungen auf Level \"Warning\" setzen"
 
+#: AKModel/admin.py:585
+msgid "Activate selected users"
+msgstr "Ausgewählte Benutzer*innen aktivieren"
+
+#: AKModel/admin.py:594
+msgid "The selected users have been activated."
+msgstr "Benutzer*innen aktiviert"
+
+#: AKModel/admin.py:596
+msgid "Deactivate selected users"
+msgstr "Ausgewählte Benutzer*innen deaktivieren"
+
+#: AKModel/admin.py:605
+msgid "The selected users have been deactivated."
+msgstr "Benutzer*innen deaktiviert"
+
 #: AKModel/availability/forms.py:25 AKModel/availability/models.py:271
 msgid "Availability"
 msgstr "Verfügbarkeit"
@@ -109,19 +125,19 @@ msgstr "Die eingegebene Verfügbarkeit enthält ein ungültiges Datum."
 msgid "Please fill in your availabilities!"
 msgstr "Bitte Verfügbarkeiten eintragen!"
 
-#: AKModel/availability/models.py:43 AKModel/models.py:60 AKModel/models.py:174
-#: AKModel/models.py:251 AKModel/models.py:270 AKModel/models.py:296
-#: AKModel/models.py:315 AKModel/models.py:371 AKModel/models.py:517
-#: AKModel/models.py:556 AKModel/models.py:646 AKModel/models.py:703
-#: AKModel/models.py:894
+#: AKModel/availability/models.py:43 AKModel/models.py:71 AKModel/models.py:187
+#: AKModel/models.py:264 AKModel/models.py:283 AKModel/models.py:309
+#: AKModel/models.py:328 AKModel/models.py:386 AKModel/models.py:546
+#: AKModel/models.py:585 AKModel/models.py:675 AKModel/models.py:732
+#: AKModel/models.py:923
 msgid "Event"
 msgstr "Event"
 
-#: AKModel/availability/models.py:44 AKModel/models.py:175
-#: AKModel/models.py:252 AKModel/models.py:271 AKModel/models.py:297
-#: AKModel/models.py:316 AKModel/models.py:372 AKModel/models.py:518
-#: AKModel/models.py:557 AKModel/models.py:647 AKModel/models.py:704
-#: AKModel/models.py:895
+#: AKModel/availability/models.py:44 AKModel/models.py:188
+#: AKModel/models.py:265 AKModel/models.py:284 AKModel/models.py:310
+#: AKModel/models.py:329 AKModel/models.py:387 AKModel/models.py:547
+#: AKModel/models.py:586 AKModel/models.py:676 AKModel/models.py:733
+#: AKModel/models.py:924
 msgid "Associated event"
 msgstr "Zugehöriges Event"
 
@@ -133,8 +149,8 @@ msgstr "Person"
 msgid "Person whose availability this is"
 msgstr "Person deren Verfügbarkeit hier abgebildet wird"
 
-#: AKModel/availability/models.py:61 AKModel/models.py:521
-#: AKModel/models.py:546 AKModel/models.py:713
+#: AKModel/availability/models.py:61 AKModel/models.py:550
+#: AKModel/models.py:575 AKModel/models.py:742
 msgid "Room"
 msgstr "Raum"
 
@@ -142,8 +158,8 @@ msgstr "Raum"
 msgid "Room whose availability this is"
 msgstr "Raum dessen Verfügbarkeit hier abgebildet wird"
 
-#: AKModel/availability/models.py:70 AKModel/models.py:380
-#: AKModel/models.py:545 AKModel/models.py:641
+#: AKModel/availability/models.py:70 AKModel/models.py:395
+#: AKModel/models.py:574 AKModel/models.py:670
 msgid "AK"
 msgstr "AK"
 
@@ -151,8 +167,8 @@ msgstr "AK"
 msgid "AK whose availability this is"
 msgstr "Verfügbarkeiten"
 
-#: AKModel/availability/models.py:79 AKModel/models.py:255
-#: AKModel/models.py:719
+#: AKModel/availability/models.py:79 AKModel/models.py:268
+#: AKModel/models.py:748
 msgid "AK Category"
 msgstr "AK-Kategorie"
 
@@ -226,7 +242,7 @@ msgstr ""
 "fürWünsche markieren, z.B. um während der Präsentation auf einem Touchscreen "
 "ausgefüllt zu werden?"
 
-#: AKModel/forms.py:198 AKModel/models.py:888
+#: AKModel/forms.py:198 AKModel/models.py:917
 msgid "Default Slots"
 msgstr "Standardslots"
 
@@ -265,7 +281,40 @@ msgstr "Standardverfügbarkeiten für alle Räume anlegen?"
 msgid "CSV must contain a name column"
 msgstr "CSV muss eine name-Spalte enthalten"
 
-#: AKModel/metaviews/admin.py:156 AKModel/models.py:29
+#: AKModel/forms.py:281
+msgid "JSON data"
+msgstr "JSON-Daten"
+
+#: AKModel/forms.py:282
+msgid "JSON data from the scheduling solver"
+msgstr "JSON-Daten, die der scheduling-solver produziert hat"
+
+#: AKModel/forms.py:299
+msgid "File with JSON data"
+msgstr "Datei mit JSON-Daten"
+
+#: AKModel/forms.py:300
+msgid "File with JSON data from the scheduling solver"
+msgstr "Datei mit JSON-Daten, die der scheduling-solver produziert hat"
+
+#: AKModel/forms.py:307
+msgid "Cannot decode as JSON"
+msgstr "Dekodierung als JSON fehlgeschlagen"
+
+#: AKModel/forms.py:311
+#, python-format
+msgid "Invalid JSON format: %(msg)s at %(error_path)s"
+msgstr "Ungültige JSON-Eingabe: %(msg)s bei %(error_path)s"
+
+#: AKModel/forms.py:321
+msgid "Please enter data as a file OR via text, not both."
+msgstr "Gib die Daten bitte als Datei oder als Text ein, nicht beides."
+
+#: AKModel/forms.py:327
+msgid "No data entered. Please enter data as a file or via text."
+msgstr "Keine Daten eingegeben. Gib die Daten bitte als Datei oder als Text ein."
+
+#: AKModel/metaviews/admin.py:156 AKModel/models.py:40
 msgid "Start"
 msgstr "Start"
 
@@ -290,67 +339,75 @@ msgstr "Aktivieren?"
 msgid "Finish"
 msgstr "Abschluss"
 
-#: AKModel/models.py:20 AKModel/models.py:243 AKModel/models.py:267
-#: AKModel/models.py:294 AKModel/models.py:313 AKModel/models.py:331
-#: AKModel/models.py:507
+#: AKModel/models.py:21
+msgid "May not contain quotation marks"
+msgstr "Darf keine Anführungszeichen enthalten"
+
+#: AKModel/models.py:24
+msgid "Must contain at least one letter or digit"
+msgstr "Muss mindestens einen Buchstaben oder eine Ziffer enthalten"
+
+#: AKModel/models.py:31 AKModel/models.py:256 AKModel/models.py:280
+#: AKModel/models.py:307 AKModel/models.py:326 AKModel/models.py:344
+#: AKModel/models.py:536
 msgid "Name"
 msgstr "Name"
 
-#: AKModel/models.py:21
+#: AKModel/models.py:32
 msgid "Name or iteration of the event"
 msgstr "Name oder Iteration des Events"
 
-#: AKModel/models.py:22
+#: AKModel/models.py:33
 msgid "Short Form"
 msgstr "Kurzer Name"
 
-#: AKModel/models.py:23
+#: AKModel/models.py:34
 msgid "Short name of letters/numbers/dots/dashes/underscores used in URLs."
 msgstr ""
 "Kurzname bestehend aus Buchstaben, Nummern, Punkten und Unterstrichen zur "
 "Nutzung in URLs"
 
-#: AKModel/models.py:25
+#: AKModel/models.py:36
 msgid "Place"
 msgstr "Ort"
 
-#: AKModel/models.py:26
+#: AKModel/models.py:37
 msgid "City etc. the event takes place in"
 msgstr "Stadt o.ä. in der das Event stattfindet"
 
-#: AKModel/models.py:28
+#: AKModel/models.py:39
 msgid "Time Zone"
 msgstr "Zeitzone"
 
-#: AKModel/models.py:28
+#: AKModel/models.py:39
 msgid "Time Zone where this event takes place in"
 msgstr "Zeitzone in der das Event stattfindet"
 
-#: AKModel/models.py:29
+#: AKModel/models.py:40
 msgid "Time the event begins"
 msgstr "Zeit zu der das Event beginnt"
 
-#: AKModel/models.py:30
+#: AKModel/models.py:41
 msgid "End"
 msgstr "Ende"
 
-#: AKModel/models.py:30
+#: AKModel/models.py:41
 msgid "Time the event ends"
 msgstr "Zeit zu der das Event endet"
 
-#: AKModel/models.py:31
+#: AKModel/models.py:42
 msgid "Resolution Deadline"
 msgstr "Resolutionsdeadline"
 
-#: AKModel/models.py:32
+#: AKModel/models.py:43
 msgid "When should AKs with intention to submit a resolution be done?"
 msgstr "Wann sollen AKs mit Resolutionsabsicht stattgefunden haben?"
 
-#: AKModel/models.py:34
+#: AKModel/models.py:45
 msgid "Interest Window Start"
 msgstr "Beginn Interessensbekundung"
 
-#: AKModel/models.py:36
+#: AKModel/models.py:47
 msgid ""
 "Opening time for expression of interest. When left blank, no interest "
 "indication will be possible."
@@ -358,71 +415,83 @@ msgstr ""
 "Öffnungszeitpunkt für die Angabe von Interesse an AKs.Wenn das Feld leer "
 "bleibt, wird keine Abgabe von Interesse möglich sein."
 
-#: AKModel/models.py:38
+#: AKModel/models.py:49
 msgid "Interest Window End"
 msgstr "Ende Interessensbekundung"
 
-#: AKModel/models.py:39
+#: AKModel/models.py:50
 msgid "Closing time for expression of interest."
 msgstr "Öffnungszeitpunkt für die Angabe von Interesse an AKs."
 
-#: AKModel/models.py:41
+#: AKModel/models.py:52
 msgid "Public event"
 msgstr "Öffentliches Event"
 
-#: AKModel/models.py:42
+#: AKModel/models.py:53
 msgid "Show this event on overview page."
 msgstr "Zeige dieses Event auf der Übersichtseite an"
 
-#: AKModel/models.py:44
+#: AKModel/models.py:55
 msgid "Active State"
 msgstr "Aktiver Status"
 
-#: AKModel/models.py:44
+#: AKModel/models.py:55
 msgid "Marks currently active events"
 msgstr "Markiert aktuell aktive Events"
 
-#: AKModel/models.py:45
+#: AKModel/models.py:56
 msgid "Plan Hidden"
 msgstr "Plan verborgen"
 
-#: AKModel/models.py:45
+#: AKModel/models.py:56
 msgid "Hides plan for non-staff users"
 msgstr "Verbirgt den Plan für Nutzer*innen ohne erweiterte Rechte"
 
-#: AKModel/models.py:47
+#: AKModel/models.py:58
 msgid "Plan published at"
 msgstr "Plan veröffentlicht am/um"
 
-#: AKModel/models.py:48
+#: AKModel/models.py:59
 msgid "Timestamp at which the plan was published"
 msgstr "Zeitpunkt, zu dem der Plan veröffentlicht wurde"
 
-#: AKModel/models.py:50
+#: AKModel/models.py:61
 msgid "Base URL"
 msgstr "URL-Prefix"
 
-#: AKModel/models.py:50
+#: AKModel/models.py:61
 msgid "Prefix for wiki link construction"
 msgstr "Prefix für die automatische Generierung von Wiki-Links"
 
-#: AKModel/models.py:51
+#: AKModel/models.py:62
 msgid "Wiki Export Template Name"
 msgstr "Wiki-Export Templatename"
 
-#: AKModel/models.py:52
+#: AKModel/models.py:63
 msgid "Default Slot Length"
 msgstr "Standardslotlänge"
 
-#: AKModel/models.py:53
+#: AKModel/models.py:64
 msgid "Default length in hours that is assumed for AKs in this event."
 msgstr "Standardlänge von Slots (in Stunden) für dieses Event"
 
-#: AKModel/models.py:55
+#: AKModel/models.py:154
+msgid "Export Slot Length"
+msgstr "Export-Slotlänge"
+
+#: AKModel/models.py:156
+msgid ""
+"Slot duration in hours that is used in the timeslot discretization, when "
+"this event is exported for the solver."
+msgstr ""
+"Länge von Slots (in Stunden) in der Zeitslot-Diskretisierung beim "
+"JSON-Export dieses Events."
+
+#: AKModel/models.py:161
 msgid "Contact email address"
 msgstr "E-Mail Kontaktadresse"
 
-#: AKModel/models.py:56
+#: AKModel/models.py:67
 msgid ""
 "An email address that is displayed on every page and can be used for all "
 "kinds of questions"
@@ -430,75 +499,115 @@ msgstr ""
 "Eine Mailadresse die auf jeder Seite angezeigt wird und für alle Arten von "
 "Fragen genutzt werden kann"
 
-#: AKModel/models.py:61
+#: AKModel/models.py:72
 msgid "Events"
 msgstr "Events"
 
-#: AKModel/models.py:169
+#: AKModel/models.py:427
+msgid "Cannot parse malformed JSON input."
+msgstr "Kann fehlerhafte JSON-Eingabe nicht verarbeiten"
+
+#: AKModel/models.py:430
+msgid "Data has changed since the export. Reexport and run the solver again."
+msgstr "Seit dem Export wurden die Daten verändert. Wiederhole den Export und führe den Solver erneut aus."
+
+#: AKModel/models.py:430
+#, python-brace-format
+msgid "AK {ak_name} is not assigned any timeslot by the solver"
+msgstr "Dem AK {ak_name} wurde vom Solver kein Zeitslot zugewiesen"
+
+#: AKModel/models.py:440
+#, python-brace-format
+msgid ""
+"Duration of AK {ak_name} assigned by solver ({solver_duration} hours) is "
+"less than the duration required by the slot ({slot_duration} hours)"
+msgstr ""
+"Die dem AK {ak_name} vom Solver zugewiesene Dauer ({solver_duration} Stunden) ist "
+"kürzer als die aktuell vorgesehene Dauer des Slots ({slot_duration} Stunden)"
+
+#: AKModel/models.py:454
+#, python-brace-format
+msgid ""
+"Fixed AK {ak_name} assigned by solver to room {solver_room} is fixed to room "
+"{slot_room}"
+msgstr ""
+"Dem fix geplanten AK {ak_name} wurde vom Solver Raum {solver_room} zugewiesen, "
+"dabei ist der AK bereits fix in Raum {slot_room} eingeplant."
+
+#: AKModel/models.py:465
+#, python-brace-format
+msgid ""
+"Fixed AK {ak_name} assigned by solver to start at {solver_start} is fixed to "
+"start at {slot_start}"
+msgstr ""
+"Dem fix geplanten AK {ak_name} wurde vom Solver die Startzeit {solver_start} zugewiesen, "
+"dabei ist der AK bereits für {slot_start} eingeplant."
+
+#: AKModel/models.py:180
 msgid "Nickname"
 msgstr "Spitzname"
 
-#: AKModel/models.py:169
+#: AKModel/models.py:182
 msgid "Name to identify an AK owner by"
 msgstr "Name, durch den eine AK-Leitung identifiziert wird"
 
-#: AKModel/models.py:170
+#: AKModel/models.py:183
 msgid "Slug"
 msgstr "Slug"
 
-#: AKModel/models.py:170
+#: AKModel/models.py:183
 msgid "Slug for URL generation"
 msgstr "Slug für URL-Generierung"
 
-#: AKModel/models.py:171
+#: AKModel/models.py:184
 msgid "Institution"
 msgstr "Instutution"
 
-#: AKModel/models.py:171
+#: AKModel/models.py:184
 msgid "Uni etc."
 msgstr "Universität o.ä."
 
-#: AKModel/models.py:172 AKModel/models.py:340
+#: AKModel/models.py:185 AKModel/models.py:355
 msgid "Web Link"
 msgstr "Internet Link"
 
-#: AKModel/models.py:172
+#: AKModel/models.py:185
 msgid "Link to Homepage"
 msgstr "Link zu Homepage oder Webseite"
 
-#: AKModel/models.py:178 AKModel/models.py:712
+#: AKModel/models.py:191 AKModel/models.py:741
 msgid "AK Owner"
 msgstr "AK-Leitung"
 
-#: AKModel/models.py:179
+#: AKModel/models.py:192
 msgid "AK Owners"
 msgstr "AK-Leitungen"
 
-#: AKModel/models.py:243
+#: AKModel/models.py:256
 msgid "Name of the AK Category"
 msgstr "Name der AK-Kategorie"
 
-#: AKModel/models.py:244 AKModel/models.py:268
+#: AKModel/models.py:257 AKModel/models.py:281
 msgid "Color"
 msgstr "Farbe"
 
-#: AKModel/models.py:244 AKModel/models.py:268
+#: AKModel/models.py:257 AKModel/models.py:281
 msgid "Color for displaying"
 msgstr "Farbe für die Anzeige"
 
-#: AKModel/models.py:245 AKModel/models.py:334
+#: AKModel/models.py:258 AKModel/models.py:349
 msgid "Description"
 msgstr "Beschreibung"
 
-#: AKModel/models.py:246
+#: AKModel/models.py:259
 msgid "Short description of this AK Category"
 msgstr "Beschreibung der AK-Kategorie"
 
-#: AKModel/models.py:247
+#: AKModel/models.py:260
 msgid "Present by default"
 msgstr "Defaultmäßig präsentieren"
 
-#: AKModel/models.py:248
+#: AKModel/models.py:261
 msgid ""
 "Present AKs of this category by default if AK owner did not specify whether "
 "this AK should be presented?"
@@ -506,152 +615,152 @@ msgstr ""
 "AKs dieser Kategorie standardmäßig vorstellen, wenn die Leitungen das für "
 "ihren AK nicht explizit spezifiziert haben?"
 
-#: AKModel/models.py:256
+#: AKModel/models.py:269
 msgid "AK Categories"
 msgstr "AK-Kategorien"
 
-#: AKModel/models.py:267
+#: AKModel/models.py:280
 msgid "Name of the AK Track"
 msgstr "Name des AK-Tracks"
 
-#: AKModel/models.py:274
+#: AKModel/models.py:287
 msgid "AK Track"
 msgstr "AK-Track"
 
-#: AKModel/models.py:275
+#: AKModel/models.py:288
 msgid "AK Tracks"
 msgstr "AK-Tracks"
 
-#: AKModel/models.py:294
+#: AKModel/models.py:307
 msgid "Name of the Requirement"
 msgstr "Name der Anforderung"
 
-#: AKModel/models.py:300 AKModel/models.py:716
+#: AKModel/models.py:313 AKModel/models.py:745
 msgid "AK Requirement"
 msgstr "AK-Anforderung"
 
-#: AKModel/models.py:301
+#: AKModel/models.py:314
 msgid "AK Requirements"
 msgstr "AK-Anforderungen"
 
-#: AKModel/models.py:313
+#: AKModel/models.py:326
 msgid "Name describing the type"
 msgstr "Name, der den Typ beschreibt"
 
-#: AKModel/models.py:319
+#: AKModel/models.py:332
 msgid "AK Type"
 msgstr "AK Typ"
 
-#: AKModel/models.py:320
+#: AKModel/models.py:333
 msgid "AK Types"
 msgstr "AK-Typen"
 
-#: AKModel/models.py:331
+#: AKModel/models.py:344
 msgid "Name of the AK"
 msgstr "Name des AKs"
 
-#: AKModel/models.py:332
+#: AKModel/models.py:346
 msgid "Short Name"
 msgstr "Kurzer Name"
 
-#: AKModel/models.py:333
+#: AKModel/models.py:348
 msgid "Name displayed in the schedule"
 msgstr "Name zur Anzeige im AK-Plan"
 
-#: AKModel/models.py:334
+#: AKModel/models.py:349
 msgid "Description of the AK"
 msgstr "Beschreibung des AKs"
 
-#: AKModel/models.py:336
+#: AKModel/models.py:351
 msgid "Owners"
 msgstr "Leitungen"
 
-#: AKModel/models.py:337
+#: AKModel/models.py:352
 msgid "Those organizing the AK"
 msgstr "Menschen, die den AK organisieren und halten"
 
-#: AKModel/models.py:340
+#: AKModel/models.py:355
 msgid "Link to wiki page"
 msgstr "Link zur Wiki Seite"
 
-#: AKModel/models.py:341
+#: AKModel/models.py:356
 msgid "Protocol Link"
 msgstr "Protokolllink"
 
-#: AKModel/models.py:341
+#: AKModel/models.py:356
 msgid "Link to protocol"
 msgstr "Link zum Protokoll"
 
-#: AKModel/models.py:343
+#: AKModel/models.py:358
 msgid "Category"
 msgstr "Kategorie"
 
-#: AKModel/models.py:344
+#: AKModel/models.py:359
 msgid "Category of the AK"
 msgstr "Kategorie des AKs"
 
-#: AKModel/models.py:345
+#: AKModel/models.py:360
 msgid "Types"
 msgstr "Typen"
 
-#: AKModel/models.py:346
+#: AKModel/models.py:361
 msgid "This AK is"
 msgstr "Dieser AK ist"
 
-#: AKModel/models.py:347
+#: AKModel/models.py:362
 msgid "Track"
 msgstr "Track"
 
-#: AKModel/models.py:348
+#: AKModel/models.py:363
 msgid "Track the AK belongs to"
 msgstr "Track zu dem der AK gehört"
 
-#: AKModel/models.py:350
+#: AKModel/models.py:365
 msgid "Resolution Intention"
 msgstr "Resolutionsabsicht"
 
-#: AKModel/models.py:351
+#: AKModel/models.py:366
 msgid "Intends to submit a resolution"
 msgstr "Beabsichtigt eine Resolution einzureichen"
 
-#: AKModel/models.py:352
+#: AKModel/models.py:367
 msgid "Present this AK"
 msgstr "AK präsentieren"
 
-#: AKModel/models.py:353
+#: AKModel/models.py:368
 msgid "Present results of this AK"
 msgstr "Die Ergebnisse dieses AKs vorstellen"
 
-#: AKModel/models.py:355 AKModel/views/status.py:167
+#: AKModel/models.py:370 AKModel/views/status.py:167
 msgid "Requirements"
 msgstr "Anforderungen"
 
-#: AKModel/models.py:356
+#: AKModel/models.py:371
 msgid "AK's Requirements"
 msgstr "Anforderungen des AKs"
 
-#: AKModel/models.py:358
+#: AKModel/models.py:373
 msgid "Conflicting AKs"
 msgstr "AK-Konflikte"
 
-#: AKModel/models.py:359
+#: AKModel/models.py:374
 msgid "AKs that conflict and thus must not take place at the same time"
 msgstr ""
 "AKs, die Konflikte haben und deshalb nicht gleichzeitig stattfinden dürfen"
 
-#: AKModel/models.py:360
+#: AKModel/models.py:375
 msgid "Prerequisite AKs"
 msgstr "Vorausgesetzte AKs"
 
-#: AKModel/models.py:361
+#: AKModel/models.py:376
 msgid "AKs that should precede this AK in the schedule"
 msgstr "AKs die im AK-Plan vor diesem AK stattfinden müssen"
 
-#: AKModel/models.py:363
+#: AKModel/models.py:378
 msgid "Organizational Notes"
 msgstr "Notizen zur Organisation"
 
-#: AKModel/models.py:364
+#: AKModel/models.py:379
 msgid ""
 "Notes to organizers. These are public. For private notes, please use the "
 "button for private messages on the detail page of this AK (after creation/"
@@ -661,295 +770,370 @@ msgstr ""
 "Anmerkungen bitte den Button für Direktnachrichten verwenden (nach dem "
 "Anlegen/Bearbeiten)."
 
-#: AKModel/models.py:367
+#: AKModel/models.py:382
 msgid "Interest"
 msgstr "Interesse"
 
-#: AKModel/models.py:367
+#: AKModel/models.py:382
 msgid "Expected number of people"
 msgstr "Erwartete Personenzahl"
 
-#: AKModel/models.py:368
+#: AKModel/models.py:383
 msgid "Interest Counter"
 msgstr "Interessenszähler"
 
-#: AKModel/models.py:369
+#: AKModel/models.py:384
 msgid "People who have indicated interest online"
 msgstr "Anzahl Personen, die online Interesse bekundet haben"
 
-#: AKModel/models.py:374
+#: AKModel/models.py:389
 msgid "Export?"
 msgstr "Export?"
 
-#: AKModel/models.py:375
+#: AKModel/models.py:390
 msgid "Include AK in wiki export?"
 msgstr "AK bei Wiki-Export berücksichtigen?"
 
-#: AKModel/models.py:507
+#: AKModel/models.py:536
 msgid "Name or number of the room"
 msgstr "Name oder Nummer des Raums"
 
-#: AKModel/models.py:508
+#: AKModel/models.py:537
 msgid "Location"
 msgstr "Ort"
 
-#: AKModel/models.py:509
+#: AKModel/models.py:538
 msgid "Name or number of the location"
 msgstr "Name oder Nummer des Ortes"
 
-#: AKModel/models.py:510
+#: AKModel/models.py:539
 msgid "Capacity"
 msgstr "Kapazität"
 
-#: AKModel/models.py:511
+#: AKModel/models.py:540
 msgid "Maximum number of people (-1 for unlimited)."
 msgstr "Maximale Personenzahl (-1 wenn unbeschränkt)."
 
-#: AKModel/models.py:512
+#: AKModel/models.py:541
 msgid "Properties"
 msgstr "Eigenschaften"
 
-#: AKModel/models.py:513
+#: AKModel/models.py:542
 msgid "AK requirements fulfilled by the room"
 msgstr "AK-Anforderungen, die dieser Raum erfüllt"
 
-#: AKModel/models.py:522 AKModel/views/status.py:59
+#: AKModel/models.py:551 AKModel/views/status.py:59
 msgid "Rooms"
 msgstr "Räume"
 
-#: AKModel/models.py:545
+#: AKModel/models.py:574
 msgid "AK being mapped"
 msgstr "AK, der zugeordnet wird"
 
-#: AKModel/models.py:547
+#: AKModel/models.py:576
 msgid "Room the AK will take place in"
 msgstr "Raum in dem der AK stattfindet"
 
-#: AKModel/models.py:548 AKModel/models.py:891
+#: AKModel/models.py:577 AKModel/models.py:920
 msgid "Slot Begin"
 msgstr "Beginn des Slots"
 
-#: AKModel/models.py:548 AKModel/models.py:891
+#: AKModel/models.py:577 AKModel/models.py:920
 msgid "Time and date the slot begins"
 msgstr "Zeit und Datum zu der der AK beginnt"
 
-#: AKModel/models.py:550
+#: AKModel/models.py:579
 msgid "Duration"
 msgstr "Dauer"
 
-#: AKModel/models.py:551
+#: AKModel/models.py:580
 msgid "Length in hours"
 msgstr "Länge in Stunden"
 
-#: AKModel/models.py:553
+#: AKModel/models.py:582
 msgid "Scheduling fixed"
 msgstr "Planung fix"
 
-#: AKModel/models.py:554
+#: AKModel/models.py:583
 msgid "Length and time of this AK should not be changed"
 msgstr "Dauer und Zeit dieses AKs sollten nicht verändert werden"
 
-#: AKModel/models.py:559
+#: AKModel/models.py:588
 msgid "Last update"
 msgstr "Letzte Aktualisierung"
 
-#: AKModel/models.py:562
+#: AKModel/models.py:591
 msgid "AK Slot"
 msgstr "AK-Slot"
 
-#: AKModel/models.py:563 AKModel/models.py:709
+#: AKModel/models.py:592 AKModel/models.py:738
 msgid "AK Slots"
 msgstr "AK-Slot"
 
-#: AKModel/models.py:585 AKModel/models.py:594
+#: AKModel/models.py:614 AKModel/models.py:623
 msgid "Not scheduled yet"
 msgstr "Noch nicht geplant"
 
-#: AKModel/models.py:642
+#: AKModel/models.py:671
 msgid "AK this message belongs to"
 msgstr "AK zu dem die Nachricht gehört"
 
-#: AKModel/models.py:643
+#: AKModel/models.py:672
 msgid "Message text"
 msgstr "Nachrichtentext"
 
-#: AKModel/models.py:644
+#: AKModel/models.py:673
 msgid "Message to the organizers. This is not publicly visible."
 msgstr ""
 "Nachricht an die Organisator*innen. Diese ist nicht öffentlich sichtbar."
 
-#: AKModel/models.py:648
+#: AKModel/models.py:677
 msgid "Resolved"
 msgstr "Erledigt"
 
-#: AKModel/models.py:649
+#: AKModel/models.py:678
 msgid "This message has been resolved (no further action needed)"
 msgstr ""
 "Diese Nachricht wurde vollständig bearbeitet (keine weiteren Aktionen "
 "notwendig)"
 
-#: AKModel/models.py:652
+#: AKModel/models.py:681
 msgid "AK Orga Message"
 msgstr "AK-Organachricht"
 
-#: AKModel/models.py:653
+#: AKModel/models.py:682
 msgid "AK Orga Messages"
 msgstr "AK-Organachrichten"
 
-#: AKModel/models.py:670
+#: AKModel/models.py:699
 msgid "Constraint Violation"
 msgstr "Constraintverletzung"
 
-#: AKModel/models.py:671
+#: AKModel/models.py:700
 msgid "Constraint Violations"
 msgstr "Constraintverletzungen"
 
-#: AKModel/models.py:678
+#: AKModel/models.py:707
 msgid "Owner has two parallel slots"
 msgstr "Leitung hat zwei Slots parallel"
 
-#: AKModel/models.py:679
+#: AKModel/models.py:708
 msgid "AK Slot was scheduled outside the AK's availabilities"
 msgstr "AK Slot wurde außerhalb der Verfügbarkeit des AKs platziert"
 
-#: AKModel/models.py:680
+#: AKModel/models.py:709
 msgid "Room has two AK slots scheduled at the same time"
 msgstr "Raum hat zwei AK Slots gleichzeitig"
 
-#: AKModel/models.py:681
+#: AKModel/models.py:710
 msgid "Room does not satisfy the requirement of the scheduled AK"
 msgstr "Room erfüllt die Anforderungen des platzierten AKs nicht"
 
-#: AKModel/models.py:682
+#: AKModel/models.py:711
 msgid "AK Slot is scheduled at the same time as an AK listed as a conflict"
 msgstr ""
 "AK Slot wurde wurde zur gleichen Zeit wie ein Konflikt des AKs platziert"
 
-#: AKModel/models.py:683
+#: AKModel/models.py:712
 msgid "AK Slot is scheduled before an AK listed as a prerequisite"
 msgstr "AK Slot wurde vor einem als Voraussetzung gelisteten AK platziert"
 
-#: AKModel/models.py:685
+#: AKModel/models.py:714
 msgid ""
 "AK Slot for AK with intention to submit a resolution is scheduled after "
 "resolution deadline"
 msgstr ""
 "AK Slot eines AKs mit Resoabsicht wurde nach der Resodeadline platziert"
 
-#: AKModel/models.py:686
+#: AKModel/models.py:715
 msgid "AK Slot in a category is outside that categories availabilities"
 msgstr "AK Slot wurde außerhalb der Verfügbarkeiten seiner Kategorie"
 
-#: AKModel/models.py:687
+#: AKModel/models.py:716
 msgid "Two AK Slots for the same AK scheduled at the same time"
 msgstr "Zwei AK Slots eines AKs wurden zur selben Zeit platziert"
 
-#: AKModel/models.py:688
+#: AKModel/models.py:717
 msgid "Room does not have enough space for interest in scheduled AK Slot"
 msgstr "Room hat nicht genug Platz für das Interesse am geplanten AK-Slot"
 
-#: AKModel/models.py:689
+#: AKModel/models.py:718
 msgid "AK Slot is scheduled outside the event's availabilities"
 msgstr "AK Slot wurde außerhalb der Verfügbarkeit des Events platziert"
 
-#: AKModel/models.py:695
+#: AKModel/models.py:724
 msgid "Warning"
 msgstr "Warnung"
 
-#: AKModel/models.py:696
+#: AKModel/models.py:725
 msgid "Violation"
 msgstr "Verletzung"
 
-#: AKModel/models.py:698
+#: AKModel/models.py:727
 msgid "Type"
 msgstr "Art"
 
-#: AKModel/models.py:699
+#: AKModel/models.py:728
 msgid "Type of violation, i.e. what kind of constraint was violated"
 msgstr "Art der Verletzung, gibt an welche Art Constraint verletzt wurde"
 
-#: AKModel/models.py:700
+#: AKModel/models.py:729
 msgid "Level"
 msgstr "Level"
 
-#: AKModel/models.py:701
+#: AKModel/models.py:730
 msgid "Severity level of the violation"
 msgstr "Schweregrad der Verletzung"
 
-#: AKModel/models.py:708
+#: AKModel/models.py:737
 msgid "AK(s) belonging to this constraint"
 msgstr "AK(s), die zu diesem Constraint gehören"
 
-#: AKModel/models.py:710
+#: AKModel/models.py:739
 msgid "AK Slot(s) belonging to this constraint"
 msgstr "AK Slot(s), die zu diesem Constraint gehören"
 
-#: AKModel/models.py:712
+#: AKModel/models.py:741
 msgid "AK Owner belonging to this constraint"
 msgstr "AK Leitung(en), die zu diesem Constraint gehören"
 
-#: AKModel/models.py:714
+#: AKModel/models.py:743
 msgid "Room belonging to this constraint"
 msgstr "Raum, der zu diesem Constraint gehört"
 
-#: AKModel/models.py:717
+#: AKModel/models.py:746
 msgid "AK Requirement belonging to this constraint"
 msgstr "AK Anforderung, die zu diesem Constraint gehört"
 
-#: AKModel/models.py:719
+#: AKModel/models.py:748
 msgid "AK Category belonging to this constraint"
 msgstr "AK Kategorie, di zu diesem Constraint gehört"
 
-#: AKModel/models.py:721
+#: AKModel/models.py:750
 msgid "Comment"
 msgstr "Kommentar"
 
-#: AKModel/models.py:721
+#: AKModel/models.py:750
 msgid "Comment or further details for this violation"
 msgstr "Kommentar oder weitere Details zu dieser Vereletzung"
 
-#: AKModel/models.py:724
+#: AKModel/models.py:753
 msgid "Timestamp"
 msgstr "Timestamp"
 
-#: AKModel/models.py:724
+#: AKModel/models.py:753
 msgid "Time of creation"
 msgstr "Zeitpunkt der ERstellung"
 
-#: AKModel/models.py:725
+#: AKModel/models.py:754
 msgid "Manually Resolved"
 msgstr "Manuell behoben"
 
-#: AKModel/models.py:726
+#: AKModel/models.py:755
 msgid "Mark this violation manually as resolved"
 msgstr "Markiere diese Verletzung manuell als behoben"
 
-#: AKModel/models.py:753 AKModel/templates/admin/AKModel/aks_by_user.html:22
+#: AKModel/models.py:782 AKModel/templates/admin/AKModel/aks_by_user.html:22
 #: AKModel/templates/admin/AKModel/requirements_overview.html:27
 msgid "Details"
 msgstr "Details"
 
-#: AKModel/models.py:887
+#: AKModel/models.py:916
 msgid "Default Slot"
 msgstr "Standardslot"
 
-#: AKModel/models.py:892
+#: AKModel/models.py:921
 msgid "Slot End"
 msgstr "Ende des Slots"
 
-#: AKModel/models.py:892
+#: AKModel/models.py:921
 msgid "Time and date the slot ends"
 msgstr "Zeit und Datum zu der der Slot endet"
 
-#: AKModel/models.py:897
+#: AKModel/models.py:926
 msgid "Primary categories"
 msgstr "Primäre Kategorien"
 
-#: AKModel/models.py:898
+#: AKModel/models.py:927
 msgid "Categories that should be assigned to this slot primarily"
 msgstr "Kategorieren, die diesem Slot primär zugewiesen werden sollen"
 
-#: AKModel/site.py:14
+#: AKModel/models.py:936
+msgid "Conflicts"
+msgstr "Konflikte"
+
+#: AKModel/models.py:939
+msgid "Prerequisites"
+msgstr "Voraussetzungen"
+
+#: AKModel/availability/models.py:89 AKModel/models.py:1358
+#: AKModel/models.py:1435
+msgid "Participant"
+msgstr "Teilnehmer*in"
+
+#: AKModel/availability/models.py:90
+msgid "Participant whose availability this is"
+msgstr "Teilnehmer*in, deren Verfügbarkeit hier abgebildet wird"
+
+#: AKModel/models.py:1359
+msgid "Participants"
+msgstr "Teilnehmende"
+
+#: AKModel/models.py:1363
+msgid ""
+"Name to identify a participant by (in case of questions from the organizers)"
+msgstr "Name, zur Identifikation bei Rückfragen von den Organisator*innen"
+
+#: AKModel/models.py:1370
+msgid "Participant's Requirements"
+msgstr "Anforderungen der Teilnehmer*in"
+
+#: AKModel/models.py:1370
+#, python-brace-format
+msgid "Anonymous {pk}"
+msgstr "Anonym {pk}"
+
+#: AKModel/models.py:1428
+msgid "AK Preference"
+msgstr "AK Präferenz"
+
+#: AKModel/models.py:1429
+msgid "AK Preferences"
+msgstr "AK Präferenzen"
+
+#: AKModel/models.py:1436
+msgid "Participant this preference belongs to"
+msgstr "Teilnehmer*in, zu der die Präferenz gehört"
+
+#: AKModel/models.py:1439
+msgid "AK Slot this preference belongs to"
+msgstr "AK-Slot zu dem die Präferenz gehört"
+
+#: AKModel/models.py:1445
+msgid "Ignore"
+msgstr "Ignorieren"
+
+#: AKModel/models.py:1446
+msgid "Prefer"
+msgstr "Präferenz"
+
+#: AKModel/models.py:1447
+msgid "Strong prefer"
+msgstr "Große Präferenz"
+
+#: AKModel/models.py:1448
+msgid "Required"
+msgstr "Erforderlich"
+
+#: AKModel/models.py:1450
+msgid "Preference"
+msgstr "Präferenz"
+
+#: AKModel/models.py:1451
+msgid "Preference level for the AK"
+msgstr "Präferenz-Level für den AK"
+
+#: AKModel/site.py:13 AKModel/site.py:14
 msgid "Administration"
 msgstr "Verwaltung"
 
@@ -1160,7 +1344,15 @@ msgstr "Anforderungen für das Event"
 msgid "AK CSV Export"
 msgstr "AK-CSV-Export"
 
-#: AKModel/views/ak.py:48
+#: AKModel/views/ak.py:50
+msgid "AK JSON Export"
+msgstr "AK-JSON-Export"
+
+#: AKModel/views/ak.py:64
+msgid "Exporting AKs for the solver failed! Reason: "
+msgstr "Daten für den Solver exportieren fehlgeschlagen! Grund: "
+
+#: AKModel/views/ak.py:133
 msgid "AK Wiki Export"
 msgstr "AK-Wiki-Export"
 
@@ -1286,6 +1478,19 @@ msgid "Updated {u} slot(s). created {c} new slot(s) and deleted {d} slot(s)"
 msgstr ""
 "{u} Slot(s) aktualisiert, {c} Slot(s) hinzugefügt und {d} Slot(s) gelöscht"
 
+#: AKModel/views/manage.py:257
+msgid "AK Schedule JSON Import"
+msgstr "AK-Plan JSON-Import"
+
+#: AKModel/views/manage.py:265
+#, python-brace-format
+msgid "Successfully imported {n} slot(s)"
+msgstr "Erfolgreich {n} Slot(s) importiert"
+
+#: AKModel/views/manage.py:271
+msgid "Importing an AK schedule failed! Reason: "
+msgstr "AK-Plan importieren fehlgeschlagen! Grund: "
+
 #: AKModel/views/room.py:37
 #, python-format
 msgid "Created Room '%(room)s'"
@@ -1337,10 +1542,18 @@ msgstr "Interesse erfassen"
 msgid "Manage ak tracks"
 msgstr "AK-Tracks verwalten"
 
+#: AKModel/views/status.py:142
+msgid "Import AK schedule from JSON"
+msgstr "AK-Plan aus JSON importieren"
+
 #: AKModel/views/status.py:142
 msgid "Export AKs as CSV"
 msgstr "AKs als CSV exportieren"
 
+#: AKModel/views/status.py:145
+msgid "Export AKs as JSON"
+msgstr "AKs als JSON exportieren"
+
 #: AKModel/views/status.py:146
 msgid "Export AKs for Wiki"
 msgstr "AKs im Wiki-Format exportieren"
@@ -1353,6 +1566,10 @@ msgstr "Zu Anforderungen gehörige AKs anzeigen"
 msgid "Event Status"
 msgstr "Eventstatus"
 
+#, python-format
+#~ msgid "Invalid JSON format: field '%(field)s' is missing"
+#~ msgstr "Ungültige JSON-Eingabe: das Feld '%(field)s' fehlt"
+
 #~ msgid "Opening time for expression of interest."
 #~ msgstr "Öffnungszeitpunkt für die Angabe von Interesse an AKs."
 

AKModel/migrations/0062_interest_no_history.py

+# Generated by Django 4.2.13 on 2025-02-26 22:35
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('AKModel', '0061_types'),
+    ]
+
+    operations = [
+        migrations.RemoveField(
+            model_name='historicalak',
+            name='interest',
+        ),
+    ]

AKModel/migrations/0063_field_validators.py

+# Generated by Django 4.2.13 on 2025-03-03 19:59
+
+import django.core.validators
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('AKModel', '0062_interest_no_history'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='ak',
+            name='name',
+            field=models.CharField(help_text='Name of the AK', max_length=256, validators=[django.core.validators.RegexValidator(inverse_match=True, message='May not contain quotation marks', regex='[\'\\"´`]+'), django.core.validators.RegexValidator(message='Must contain at least one letter or digit', regex='[\\w\\s]+')], verbose_name='Name'),
+        ),
+        migrations.AlterField(
+            model_name='ak',
+            name='short_name',
+            field=models.CharField(blank=True, help_text='Name displayed in the schedule', max_length=64, validators=[django.core.validators.RegexValidator(inverse_match=True, message='May not contain quotation marks', regex='[\'\\"´`]+')], verbose_name='Short Name'),
+        ),
+        migrations.AlterField(
+            model_name='akowner',
+            name='name',
+            field=models.CharField(help_text='Name to identify an AK owner by', max_length=64, validators=[django.core.validators.RegexValidator(inverse_match=True, message='May not contain quotation marks', regex='[\'\\"´`]+'), django.core.validators.RegexValidator(message='Must contain at least one letter or digit', regex='[\\w\\s]+')], verbose_name='Nickname'),
+        ),
+        migrations.AlterField(
+            model_name='historicalak',
+            name='name',
+            field=models.CharField(help_text='Name of the AK', max_length=256, validators=[django.core.validators.RegexValidator(inverse_match=True, message='May not contain quotation marks', regex='[\'\\"´`]+'), django.core.validators.RegexValidator(message='Must contain at least one letter or digit', regex='[\\w\\s]+')], verbose_name='Name'),
+        ),
+        migrations.AlterField(
+            model_name='historicalak',
+            name='short_name',
+            field=models.CharField(blank=True, help_text='Name displayed in the schedule', max_length=64, validators=[django.core.validators.RegexValidator(inverse_match=True, message='May not contain quotation marks', regex='[\'\\"´`]+')], verbose_name='Short Name'),
+        ),
+    ]

AKModel/migrations/0064_event_export_slot.py

+# Generated by Django 5.1.6 on 2025-03-29 22:05
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("AKModel", "0063_field_validators"),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name="event",
+            name="export_slot",
+            field=models.DecimalField(
+                decimal_places=2,
+                default=1,
+                help_text="Slot duration in hours that is used in the timeslot discretization, when this event is exported for the solver.",
+                max_digits=4,
+                verbose_name="Export Slot Length",
+            ),
+        ),
+    ]

AKModel/migrations/0065_eventparticipant_akpreference_and_more.py

+# Generated by Django 4.2.13 on 2025-02-10 10:23
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("AKModel", "0064_event_export_slot"),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name="EventParticipant",
+            fields=[
+                (
+                    "id",
+                    models.AutoField(
+                        auto_created=True,
+                        primary_key=True,
+                        serialize=False,
+                        verbose_name="ID",
+                    ),
+                ),
+                (
+                    "name",
+                    models.CharField(
+                        blank=True,
+                        help_text="Name to identify a participant by (in case of questions from the organizers)",
+                        max_length=64,
+                        verbose_name="Nickname",
+                    ),
+                ),
+                (
+                    "institution",
+                    models.CharField(
+                        blank=True,
+                        help_text="Uni etc.",
+                        max_length=128,
+                        verbose_name="Institution",
+                    ),
+                ),
+                (
+                    "event",
+                    models.ForeignKey(
+                        help_text="Associated event",
+                        on_delete=django.db.models.deletion.CASCADE,
+                        to="AKModel.event",
+                        verbose_name="Event",
+                    ),
+                ),
+            ],
+            options={
+                "verbose_name": "Participant",
+                "verbose_name_plural": "Participants",
+                "ordering": ["name"],
+            },
+        ),
+        migrations.CreateModel(
+            name="AKPreference",
+            fields=[
+                (
+                    "id",
+                    models.AutoField(
+                        auto_created=True,
+                        primary_key=True,
+                        serialize=False,
+                        verbose_name="ID",
+                    ),
+                ),
+                (
+                    "preference",
+                    models.PositiveSmallIntegerField(
+                        choices=[
+                            (0, "Ignore"),
+                            (1, "Prefer"),
+                            (2, "Strong prefer"),
+                            (3, "Required"),
+                        ],
+                        default=0,
+                        help_text="Preference level for the AK",
+                        verbose_name="Preference",
+                    ),
+                ),
+                (
+                    "ak",
+                    models.ForeignKey(
+                        help_text="AK this preference belongs to",
+                        on_delete=django.db.models.deletion.CASCADE,
+                        to="AKModel.ak",
+                        verbose_name="AK",
+                    ),
+                ),
+                (
+                    "event",
+                    models.ForeignKey(
+                        help_text="Associated event",
+                        on_delete=django.db.models.deletion.CASCADE,
+                        to="AKModel.event",
+                        verbose_name="Event",
+                    ),
+                ),
+                (
+                    "participant",
+                    models.ForeignKey(
+                        help_text="Participant this preference belongs to",
+                        on_delete=django.db.models.deletion.CASCADE,
+                        to="AKModel.eventparticipant",
+                        verbose_name="Participant",
+                    ),
+                ),
+            ],
+            options={
+                "verbose_name": "AK Preference",
+                "verbose_name_plural": "AK Preferences",
+            },
+        ),
+        migrations.AddField(
+            model_name="availability",
+            name="participant",
+            field=models.ForeignKey(
+                blank=True,
+                help_text="Participant whose availability this is",
+                null=True,
+                on_delete=django.db.models.deletion.CASCADE,
+                related_name="availabilities",
+                to="AKModel.eventparticipant",
+                verbose_name="Participant",
+            ),
+        ),
+    ]

AKModel/migrations/0066_akpreference_slot_alter_akpreference_unique_together_and_more.py

+# Generated by Django 4.2.13 on 2025-02-10 22:31
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("AKModel", "0065_eventparticipant_akpreference_and_more"),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name="akpreference",
+            name="slot",
+            field=models.ForeignKey(
+                default=None,
+                help_text="AKSlot this preference belongs to",
+                on_delete=django.db.models.deletion.CASCADE,
+                to="AKModel.akslot",
+                verbose_name="AKSlot",
+            ),
+            preserve_default=False,
+        ),
+        migrations.AlterUniqueTogether(
+            name="akpreference",
+            unique_together={("event", "participant", "slot")},
+        ),
+        migrations.RemoveField(
+            model_name="akpreference",
+            name="ak",
+        ),
+    ]

AKModel/migrations/0067_eventparticipant_requirements_and_more.py

+# Generated by Django 4.2.13 on 2025-02-11 00:23
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        (
+            "AKModel",
+            "0066_akpreference_slot_alter_akpreference_unique_together_and_more",
+        ),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name="eventparticipant",
+            name="requirements",
+            field=models.ManyToManyField(
+                blank=True,
+                help_text="Participant's Requirements",
+                to="AKModel.akrequirement",
+                verbose_name="Requirements",
+            ),
+        ),
+        migrations.AlterField(
+            model_name="akpreference",
+            name="slot",
+            field=models.ForeignKey(
+                help_text="AK Slot this preference belongs to",
+                on_delete=django.db.models.deletion.CASCADE,
+                to="AKModel.akslot",
+                verbose_name="AK Slot",
+            ),
+        ),
+    ]

AKModel/models.py

+import decimal
 import itertools
-from datetime import timedelta
+import json
+import math
+from dataclasses import dataclass
+from datetime import datetime, timedelta
+from typing import Any, Generator, Iterable
 
-from django.db import models
 from django.apps import apps
+from django.core.validators import RegexValidator
+from django.db import models, transaction
 from django.db.models import Count
 from django.urls import reverse_lazy
 from django.utils import timezone
-from django.utils.datetime_safe import datetime
 from django.utils.text import slugify
 from django.utils.translation import gettext_lazy as _
 from simple_history.models import HistoricalRecords
 from timezone_field import TimeZoneField
 
+# Custom validators to be used for some of the fields
+# Prevent inclusion of the quotation marks ' " ´ `
+# This may be necessary to prevent javascript issues
+no_quotation_marks_validator = RegexValidator(regex=r"['\"´`]+", inverse_match=True,
+                                              message=_('May not contain quotation marks'))
+# Enforce that the field contains of at least one letter or digit (and not just special characters
+# This prevents issues when autogenerating slugs from that field
+slugable_validator = RegexValidator(regex=r"[\w\s]+", message=_('Must contain at least one letter or digit'))
+
+
+@dataclass
+class OptimizerTimeslot:
+    """Class describing a discrete timeslot. Used to interface with an optimizer."""
+
+    avail: "Availability"
+    """The availability object corresponding to this timeslot."""
+
+    idx: int
+    """The unique index of this optimizer timeslot."""
+
+    constraints: set[str]
+    """The set of time constraints fulfilled by this object."""
+
+    def merge(self, other: "OptimizerTimeslot") -> "OptimizerTimeslot":
+        """Merge with other OptimizerTimeslot.
+
+        Creates a new OptimizerTimeslot object.
+        Its availability is constructed by merging the availabilities of self and other,
+        its constraints by taking the union of both constraint sets.
+        As an index, the index of self is used.
+        """
+        avail = self.avail.merge_with(other.avail)
+        constraints = self.constraints.union(other.constraints)
+        return OptimizerTimeslot(
+            avail=avail, idx=self.idx, constraints=constraints
+        )
+
+    def __repr__(self) -> str:
+        return f"({self.avail.simplified}, {self.idx}, {self.constraints})"
+
+TimeslotBlock = list[OptimizerTimeslot]
+
+
+def merge_blocks(
+    blocks: Iterable[TimeslotBlock]
+) -> Iterable[TimeslotBlock]:
+    """Merge iterable of blocks together.
+
+    The timeslots of all blocks are grouped into maximal blocks.
+    Timeslots with the same start and end are identified with each other
+    and merged (cf `OptimizerTimeslot.merge`).
+    Throws a ValueError if any timeslots are overlapping but do not
+    share the same start and end, i.e. partial overlap is not allowed.
+
+    :param blocks: iterable of blocks to merge.
+    :return: iterable of merged blocks.
+    :rtype: iterable over lists of OptimizerTimeslot objects
+    """
+    if not blocks:
+        return []
+
+    # flatten timeslot iterables to single chain
+    timeslot_chain = itertools.chain.from_iterable(blocks)
+
+    # sort timeslots according to start
+    timeslots = sorted(
+        timeslot_chain,
+        key=lambda slot: slot.avail.start
+    )
+
+    if not timeslots:
+        return []
+
+    all_blocks = []
+    current_block = [timeslots[0]]
+    timeslots = timeslots[1:]
+
+    for slot in timeslots:
+        if current_block and slot.avail.overlaps(current_block[-1].avail, strict=True):
+            if (
+                slot.avail.start == current_block[-1].avail.start
+                and slot.avail.end == current_block[-1].avail.end
+            ):
+                # the same timeslot -> merge
+                current_block[-1] = current_block[-1].merge(slot)
+            else:
+                # partial overlap of interiors -> not supported
+                raise ValueError(
+                    "Partially overlapping timeslots are not supported!"
+                    f" ({current_block[-1].avail.simplified}, {slot.avail.simplified})"
+                )
+        elif not current_block or slot.avail.overlaps(current_block[-1].avail, strict=False):
+            # only endpoints in intersection -> same block
+            current_block.append(slot)
+        else:
+            # no overlap at all -> new block
+            all_blocks.append(current_block)
+            current_block = [slot]
+
+    if current_block:
+        all_blocks.append(current_block)
+
+    return all_blocks
+
 
 class Event(models.Model):
     """
@@ -32,8 +141,9 @@ class Event(models.Model):
                                          help_text=_('When should AKs with intention to submit a resolution be done?'))
 
     interest_start = models.DateTimeField(verbose_name=_('Interest Window Start'), blank=True, null=True,
-              help_text=
-              _('Opening time for expression of interest. When left blank, no interest indication will be possible.'))
+                                          help_text=
+                                          _('Opening time for expression of interest. When left blank, no interest '
+                                            'indication will be possible.'))
 
     interest_end = models.DateTimeField(verbose_name=_('Interest Window End'), blank=True, null=True,
                                         help_text=_('Closing time for expression of interest.'))
@@ -45,16 +155,22 @@ class Event(models.Model):
     plan_hidden = models.BooleanField(verbose_name=_('Plan Hidden'), help_text=_('Hides plan for non-staff users'),
                                       default=True)
     plan_published_at = models.DateTimeField(verbose_name=_('Plan published at'), blank=True, null=True,
-                                         help_text=_('Timestamp at which the plan was published'))
+                                             help_text=_('Timestamp at which the plan was published'))
 
     base_url = models.URLField(verbose_name=_("Base URL"), help_text=_("Prefix for wiki link construction"), blank=True)
     wiki_export_template_name = models.CharField(verbose_name=_("Wiki Export Template Name"), blank=True, max_length=50)
     default_slot = models.DecimalField(max_digits=4, decimal_places=2, default=2, verbose_name=_('Default Slot Length'),
                                        help_text=_('Default length in hours that is assumed for AKs in this event.'))
+    export_slot = models.DecimalField(max_digits=4, decimal_places=2, default=1, verbose_name=_('Export Slot Length'),
+                                        help_text=_(
+                                            'Slot duration in hours that is used in the timeslot discretization, '
+                                            'when this event is exported for the solver.'
+                                        ))
+
 
     contact_email = models.EmailField(verbose_name=_("Contact email address"), blank=True,
-                                        help_text=_("An email address that is displayed on every page "
-                                                    "and can be used for all kinds of questions"))
+                                      help_text=_("An email address that is displayed on every page "
+                                                  "and can be used for all kinds of questions"))
 
     class Meta:
         verbose_name = _('Event')
@@ -85,7 +201,7 @@ class Event(models.Model):
         event = Event.objects.filter(active=True).order_by('start').first()
         # No active event? Return the next event taking place
         if event is None:
-            event = Event.objects.order_by('start').filter(start__gt=datetime.now()).first()
+            event = Event.objects.order_by('start').filter(start__gt=datetime.now().astimezone()).first()
         return event
 
     def get_categories_with_aks(self, wishes_seperately=False,
@@ -162,11 +278,429 @@ class Event(models.Model):
                 .filter(availabilities__count=0, owners__count__gt=0)
                 )
 
+    def _generate_slots_from_block(
+        self,
+        start: datetime,
+        end: datetime,
+        slot_duration: timedelta,
+        *,
+        slot_index: int = 0,
+        constraints: set[str] | None = None,
+    ) -> Generator[TimeslotBlock, None, int]:
+        """Discretize a time range into timeslots.
+
+        Uses a uniform discretization into discrete slots of length `slot_duration`,
+        starting at `start`. No incomplete timeslots are generated, i.e.
+        if (`end` - `start`) is not a whole number multiple of `slot_duration`
+        then the last incomplete timeslot is dropped.
+
+        :param start: Start of the time range.
+        :param end: Start of the time range.
+        :param slot_duration: Duration of a single timeslot in the discretization.
+        :param slot_index: index of the first timeslot. Defaults to 0.
+
+        :yield: Block of optimizer timeslots as the discretization result.
+        :ytype: list of OptimizerTimeslot
+
+        :return: The first slot index after the yielded blocks, i.e.
+            `slot_index` + total # generated timeslots
+        :rtype: int
+        """
+        # local import to prevent cyclic import
+        # pylint: disable=import-outside-toplevel
+        from AKModel.availability.models import Availability
+
+        current_slot_start = start
+        previous_slot_start: datetime | None = None
+
+        if constraints is None:
+            constraints = set()
+
+        current_block = []
+
+        room_availabilities = list({
+            availability
+            for room in Room.objects.filter(event=self)
+            for availability in room.availabilities.all()
+        })
+
+        while current_slot_start + slot_duration <= end:
+            slot = Availability(
+                event=self,
+                start=current_slot_start,
+                end=current_slot_start + slot_duration,
+            )
+
+            if any((availability.contains(slot) for availability in room_availabilities)):
+                # no gap in a block
+                if (
+                    previous_slot_start is not None
+                    and previous_slot_start + slot_duration < current_slot_start
+                ):
+                    yield current_block
+                    current_block = []
+
+                current_block.append(
+                    OptimizerTimeslot(avail=slot, idx=slot_index, constraints=constraints)
+                )
+                previous_slot_start = current_slot_start
+
+            slot_index += 1
+            current_slot_start += slot_duration
+
+        if current_block:
+            yield current_block
+
+        return slot_index
+
+    def uniform_time_slots(self, *, slots_in_an_hour: float) -> Iterable[TimeslotBlock]:
+        """Uniformly discretize the entire event into blocks of timeslots.
+
+        Discretizes entire event uniformly. May not necessarily result in a single block
+        as slots with no room availability are dropped.
+
+        :param slots_in_an_hour: The percentage of an hour covered by a single slot.
+            Determines the discretization granularity.
+        :yield: Block of optimizer timeslots as the discretization result.
+        :ytype: list of OptimizerTimeslot
+        """
+        all_category_constraints = AKCategory.create_category_optimizer_constraints(
+            AKCategory.objects.filter(event=self).all()
+        )
+
+        yield from self._generate_slots_from_block(
+            start=self.start,
+            end=self.end,
+            slot_duration=timedelta(hours=1.0 / slots_in_an_hour),
+            constraints=all_category_constraints,
+        )
+
+    def default_time_slots(self, *, slots_in_an_hour: float) -> Iterable[TimeslotBlock]:
+        """Discretize all default slots into blocks of timeslots.
+
+        In the discretization each default slot corresponds to one block.
+
+        :param slots_in_an_hour: The percentage of an hour covered by a single slot.
+            Determines the discretization granularity.
+        :yield: Block of optimizer timeslots as the discretization result.
+        :ytype: list of TimeslotBlock
+        """
+        slot_duration = timedelta(hours=1.0 / slots_in_an_hour)
+        slot_index = 0
+
+        for block_slot in DefaultSlot.objects.filter(event=self).order_by("start", "end"):
+            category_constraints = AKCategory.create_category_optimizer_constraints(
+                block_slot.primary_categories.all()
+            )
+
+            slot_index = yield from self._generate_slots_from_block(
+                start=block_slot.start,
+                end=block_slot.end,
+                slot_duration=slot_duration,
+                slot_index=slot_index,
+                constraints=category_constraints,
+            )
+
+    def discretize_timeslots(self, *, slots_in_an_hour: float | None = None) -> Iterable[TimeslotBlock]:
+        """"Choose discretization scheme.
+
+        Uses default_time_slots if the event has any DefaultSlot, otherwise uniform_time_slots.
+
+        :param slots_in_an_hour: The percentage of an hour covered by a single slot.
+            Determines the discretization granularity.
+        :yield: Block of optimizer timeslots as the discretization result.
+        :ytype: list of TimeslotBlock
+        """
+
+        if slots_in_an_hour is None:
+            slots_in_an_hour = 1.0 / float(self.export_slot)
+
+        if DefaultSlot.objects.filter(event=self).exists():
+            # discretize default slots if they exists
+            yield from merge_blocks(self.default_time_slots(slots_in_an_hour=slots_in_an_hour))
+        else:
+            yield from self.uniform_time_slots(slots_in_an_hour=slots_in_an_hour)
+
+    @transaction.atomic
+    def schedule_from_json(
+        self, schedule: str | dict[str, Any], *, check_for_data_inconsistency: bool = True
+    ) -> int:
+        """Load AK schedule from a json string.
+
+        :param schedule: A string that can be decoded to json, describing
+            the AK schedule. The json data is assumed to be constructed
+            following the output specification of the KoMa conference optimizer, cf.
+            https://github.com/Die-KoMa/ak-plan-optimierung/wiki/Input-&-output-format
+        """
+        if isinstance(schedule, str):
+            schedule = json.loads(schedule)
+
+        if "input" not in schedule or "scheduled_aks" not in schedule:
+            raise ValueError(_("Cannot parse malformed JSON input."))
+
+        if check_for_data_inconsistency:
+            export_dict = self.as_json_dict()
+            if schedule["input"] != export_dict:
+                raise ValueError(_("Data has changed since the export. Reexport and run the solver again."))
+
+        slots_in_an_hour = schedule["input"]["timeslots"]["info"]["duration"]
+
+        timeslot_dict = {
+            timeslot.idx: timeslot
+            for block in self.discretize_timeslots(slots_in_an_hour=slots_in_an_hour)
+            for timeslot in block
+        }
+
+        slots_updated = 0
+        for scheduled_slot in schedule["scheduled_aks"]:
+            scheduled_slot["timeslot_ids"] = list(map(int, scheduled_slot["timeslot_ids"]))
+            slot = AKSlot.objects.get(id=int(scheduled_slot["ak_id"]))
+
+            if not scheduled_slot["timeslot_ids"]:
+                raise ValueError(
+                    _("AK {ak_name} is not assigned any timeslot by the solver").format(ak_name=slot.ak.name)
+                )
+
+            start_timeslot = timeslot_dict[min(scheduled_slot["timeslot_ids"])].avail
+            end_timeslot = timeslot_dict[max(scheduled_slot["timeslot_ids"])].avail
+            solver_duration = (end_timeslot.end - start_timeslot.start).total_seconds() / 3600.0
+
+            if solver_duration + 2e-4 < slot.duration:
+                raise ValueError(
+                    _(
+                        "Duration of AK {ak_name} assigned by solver ({solver_duration} hours) "
+                        "is less than the duration required by the slot ({slot_duration} hours)"
+                    ).format(
+                        ak_name=slot.ak.name,
+                        solver_duration=solver_duration,
+                        slot_duration=slot.duration,
+                    )
+                )
+
+            if slot.fixed:
+                solver_room = Room.objects.get(id=int(scheduled_slot["room_id"]))
+                if slot.room != solver_room:
+                    raise ValueError(
+                        _(
+                            "Fixed AK {ak_name} assigned by solver to room {solver_room} "
+                            "is fixed to room {slot_room}"
+                        ).format(
+                            ak_name=slot.ak.name,
+                            solver_room=solver_room.name,
+                            slot_room=slot.room.name,
+                        )
+                    )
+                if slot.start != start_timeslot.start:
+                    raise ValueError(
+                        _(
+                            "Fixed AK {ak_name} assigned by solver to start at {solver_start} "
+                            "is fixed to start at {slot_start}"
+                        ).format(
+                            ak_name=slot.ak.name,
+                            solver_start=start_timeslot.start,
+                            slot_start=slot.start,
+                        )
+                    )
+            else:
+                slot.room = Room.objects.get(id=int(scheduled_slot["room_id"]))
+                slot.start = start_timeslot.start
+                slot.save()
+                slots_updated += 1
+
+        return slots_updated
+
+    def as_json_dict(self) -> dict[str, Any]:
+        """Return the json representation of this Event.
+
+        :return: The json dict representation is constructed
+            following the input specification of the KoMa conference optimizer, cf.
+            https://github.com/Die-KoMa/ak-plan-optimierung/wiki/Input-&-output-format
+        :rtype: dict[str, Any]
+        """
+
+        # local import to prevent cyclic import
+        # pylint: disable=import-outside-toplevel
+        from AKModel.availability.models import Availability
+
+        def _check_event_not_covered(availabilities: list[Availability]) -> bool:
+            """Test if event is not covered by availabilities."""
+            return not Availability.is_event_covered(self, availabilities)
+
+        def _check_akslot_fixed_in_timeslot(ak_slot: AKSlot, timeslot: Availability) -> bool:
+            """Test if an AKSlot is fixed to overlap a timeslot slot."""
+            if not ak_slot.fixed or ak_slot.start is None:
+                return False
+
+            fixed_avail = Availability(event=self, start=ak_slot.start, end=ak_slot.end)
+            return fixed_avail.overlaps(timeslot, strict=True)
+
+        def _check_add_constraint(slot: Availability, availabilities: list[Availability]) -> bool:
+            """Test if object is not available for whole event and may happen during slot."""
+            return (
+                _check_event_not_covered(availabilities) and slot.is_covered(availabilities)
+            )
+
+        def _generate_time_constraints(
+            avail_label: str,
+            avail_dict: dict,
+            timeslot_avail: Availability,
+            prefix: str = "availability",
+        ) -> list[str]:
+            return [
+                f"{prefix}-{avail_label}-{pk}"
+                for pk, availabilities in avail_dict.items()
+                if _check_add_constraint(timeslot_avail, availabilities)
+            ]
+
+        timeslots = {
+            "info": {"duration": float(self.export_slot)},
+            "blocks": [],
+            }
+
+        rooms = Room.objects.filter(event=self).order_by()
+        slots = AKSlot.objects.filter(event=self).order_by()
+        participants = EventParticipant.objects.filter(event=self).order_by()
+        owners = AKOwner.objects.filter(event=self).order_by().all()
+
+        ak_availabilities = {
+            ak.pk: Availability.union(ak.availabilities.all())
+            for ak in AK.objects.filter(event=self).all()
+        }
+        room_availabilities = {
+            room.pk: Availability.union(room.availabilities.all())
+            for room in rooms
+        }
+        person_availabilities = {
+            person.pk: Availability.union(person.availabilities.all())
+            for person in owners
+        }
+        participant_availabilities = {
+            participant.pk: Availability.union(participant.availabilities.all())
+            for participant in EventParticipant.objects.filter(event=self)
+        }
+
+        blocks = list(self.discretize_timeslots())
+
+        block_names = []
+
+        for block_idx, block in enumerate(blocks):
+            current_block = []
+
+            if not block:
+                continue
+
+            block_start = block[0].avail.start.astimezone(self.timezone)
+            block_end = block[-1].avail.end.astimezone(self.timezone)
+
+            start_day = block_start.strftime("%A, %d. %b")
+            if block_start.date() == block_end.date():
+                # same day
+                time_str = block_start.strftime("%H:%M") + " - " + block_end.strftime("%H:%M")
+            else:
+                # different days
+                time_str = block_start.strftime("%a %H:%M") + " - " + block_end.strftime("%a %H:%M")
+            block_names.append([start_day, time_str])
+
+            block_timeconstraints = [f"notblock{idx}" for idx in range(len(blocks)) if idx != block_idx]
+
+            for timeslot in block:
+                time_constraints = []
+                # if reso_deadline is set and timeslot ends before it,
+                #   add fulfilled time constraint 'resolution'
+                if self.reso_deadline is None or timeslot.avail.end < self.reso_deadline:
+                    time_constraints.append("resolution")
+
+                # add fulfilled time constraints for all AKs that cannot happen during full event
+                time_constraints.extend(
+                    _generate_time_constraints("ak", ak_availabilities, timeslot.avail)
+                )
+
+                # add fulfilled time constraints for all persons that are not available for full event
+                time_constraints.extend(
+                    _generate_time_constraints("person", person_availabilities, timeslot.avail)
+                )
+
+                # add fulfilled time constraints for all rooms that are not available for full event
+                time_constraints.extend(
+                    _generate_time_constraints("room", room_availabilities, timeslot.avail)
+                )
+
+                # add fulfilled time constraints for all participants that are not available for full event
+                time_constraints.extend(
+                    _generate_time_constraints("participant", participant_availabilities, timeslot.avail)
+                )
+
+                # add fulfilled time constraints for all AKSlots fixed to happen during timeslot
+                time_constraints.extend([
+                    f"fixed-akslot-{slot.id}"
+                    for slot in AKSlot.objects.filter(event=self, fixed=True).exclude(start__isnull=True)
+                    if _check_akslot_fixed_in_timeslot(slot, timeslot.avail)
+                ])
+
+                time_constraints.extend(timeslot.constraints)
+                time_constraints.extend(block_timeconstraints)
+                time_constraints.sort()
+
+                current_block.append({
+                    "id": timeslot.idx,
+                    "info": {
+                        "start": timeslot.avail.start.astimezone(self.timezone).strftime("%Y-%m-%d %H:%M"),
+                        "end": timeslot.avail.end.astimezone(self.timezone).strftime("%Y-%m-%d %H:%M"),
+                    },
+                    "fulfilled_time_constraints": time_constraints,
+                    })
+
+            timeslots["blocks"].append(current_block)
+
+        timeslots["info"]["blocknames"] = block_names
+
+        info_dict = {
+            "title": self.name,
+            "slug": self.slug
+        }
+
+        for attr in ["contact_email", "place"]:
+            if hasattr(self, attr) and getattr(self, attr):
+                info_dict[attr] = getattr(self, attr)
+
+        data = {
+            "participants": [p.as_json_dict() for p in participants],
+            "rooms": [r.as_json_dict() for r in rooms],
+            "timeslots": timeslots,
+            "info": info_dict,
+            "aks": [ak.as_json_dict() for ak in slots],
+        }
+
+        if EventParticipant.objects.exists():
+            next_participant_pk = EventParticipant.objects.latest("pk").pk + 1
+        else:
+            next_participant_pk = 1
+        # add one dummy participant per owner
+        # this ensures that the hard constraints from each owner are considered
+        for new_pk, owner in enumerate(owners, next_participant_pk):
+            owned_slots = slots.filter(ak__owners=owner).order_by().all()
+            if not owned_slots:
+                continue
+            new_participant_data = {
+                "id": new_pk,
+                "info": {"name": f"{owner} [AKOwner]"},
+                "room_constraints": [],
+                "time_constraints": [],
+                "preferences": [
+                    {"ak_id": slot.pk, "required": True, "preference_score": -1}
+                    for slot in owned_slots
+                ]
+            }
+            data["participants"].append(new_participant_data)
+        return data
+
 
 class AKOwner(models.Model):
     """ An AKOwner describes the person organizing/holding an AK.
     """
-    name = models.CharField(max_length=64, verbose_name=_('Nickname'), help_text=_('Name to identify an AK owner by'))
+    name = models.CharField(max_length=64, verbose_name=_('Nickname'),
+                            validators=[no_quotation_marks_validator, slugable_validator],
+                            help_text=_('Name to identify an AK owner by'))
     slug = models.SlugField(max_length=64, blank=True, verbose_name=_('Slug'), help_text=_('Slug for URL generation'))
     institution = models.CharField(max_length=128, blank=True, verbose_name=_('Institution'), help_text=_('Uni etc.'))
     link = models.URLField(blank=True, verbose_name=_('Web Link'), help_text=_('Link to Homepage'))
@@ -245,8 +779,8 @@ class AKCategory(models.Model):
     description = models.TextField(blank=True, verbose_name=_("Description"),
                                    help_text=_("Short description of this AK Category"))
     present_by_default = models.BooleanField(blank=True, default=True, verbose_name=_("Present by default"),
-                                             help_text=_("Present AKs of this category by default "
-                                                 "if AK owner did not specify whether this AK should be presented?"))
+                                             help_text=_("Present AKs of this category by default if AK owner did not "
+                                                         "specify whether this AK should be presented?"))
 
     event = models.ForeignKey(to=Event, on_delete=models.CASCADE, verbose_name=_('Event'),
                               help_text=_('Associated event'))
@@ -260,6 +794,20 @@ class AKCategory(models.Model):
     def __str__(self):
         return self.name
 
+    @staticmethod
+    def create_category_optimizer_constraints(categories: Iterable["AKCategory"]) -> set[str]:
+        """Create a set of constraint strings from an AKCategory iterable.
+
+        :param categories: The iterable of categories to derive the constraint strings from.
+        :return: A set of category constraint strings, i.e. strings of the form
+            'availability-cat-<cat.name>'.
+        :rtype: set of strings.
+        """
+        return {
+            f"availability-cat-{cat.name}"
+            for cat in categories
+        }
+
 
 class AKTrack(models.Model):
     """ An AKTrack describes a set of semantically related AKs.
@@ -328,8 +876,10 @@ class AKType(models.Model):
 class AK(models.Model):
     """ An AK is a slot-based activity to be scheduled during an event.
     """
-    name = models.CharField(max_length=256, verbose_name=_('Name'), help_text=_('Name of the AK'))
+    name = models.CharField(max_length=256, verbose_name=_('Name'), help_text=_('Name of the AK'),
+                            validators=[no_quotation_marks_validator, slugable_validator])
     short_name = models.CharField(max_length=64, blank=True, verbose_name=_('Short Name'),
+                                  validators=[no_quotation_marks_validator],
                                   help_text=_('Name displayed in the schedule'))
     description = models.TextField(blank=True, verbose_name=_('Description'), help_text=_('Description of the AK'))
 
@@ -343,7 +893,7 @@ class AK(models.Model):
     category = models.ForeignKey(to=AKCategory, on_delete=models.PROTECT, verbose_name=_('Category'),
                                  help_text=_('Category of the AK'))
     types = models.ManyToManyField(to=AKType, blank=True, verbose_name=_('Types'),
-                                          help_text=_("This AK is"))
+                                   help_text=_("This AK is"))
     track = models.ForeignKey(to=AKTrack, blank=True, on_delete=models.SET_NULL, null=True, verbose_name=_('Track'),
                               help_text=_('Track the AK belongs to'))
 
@@ -361,8 +911,8 @@ class AK(models.Model):
                                            help_text=_('AKs that should precede this AK in the schedule'))
 
     notes = models.TextField(blank=True, verbose_name=_('Organizational Notes'), help_text=_(
-        'Notes to organizers. These are public. For private notes, please use the button for private messages '
-        'on the detail page of this AK (after creation/editing).'))
+            'Notes to organizers. These are public. For private notes, please use the button for private messages '
+            'on the detail page of this AK (after creation/editing).'))
 
     interest = models.IntegerField(default=-1, verbose_name=_('Interest'), help_text=_('Expected number of people'))
     interest_counter = models.IntegerField(default=0, verbose_name=_('Interest Counter'),
@@ -374,7 +924,7 @@ class AK(models.Model):
     include_in_export = models.BooleanField(default=True, verbose_name=_('Export?'),
                                             help_text=_("Include AK in wiki export?"))
 
-    history = HistoricalRecords(excluded_fields=['interest_counter', 'include_in_export'])
+    history = HistoricalRecords(excluded_fields=['interest', 'interest_counter', 'include_in_export'])
 
     class Meta:
         verbose_name = _('AK')
@@ -400,7 +950,7 @@ class AK(models.Model):
         availabilities = ', \n'.join(f'{a.simplified}' for a in Availability.objects.select_related('event')
                                      .filter(ak=self))
         detail_string = f"""{self.name}{" (R)" if self.reso else ""}:
-        
+
         {self.owners_list}
 
         {_('Interest')}: {self.interest}"""
@@ -408,8 +958,22 @@ class AK(models.Model):
             detail_string += f"\n{_('Requirements')}: {', '.join(str(r) for r in self.requirements.all())}"
         if self.types.count() > 0:
             detail_string += f"\n{_('Types')}: {', '.join(str(r) for r in self.types.all())}"
+
+        # Find conflicts
+        # (both directions, those specified for this AK and those were this AK was specified as conflict)
+        # Deduplicate and order list alphabetically
+        conflicts = set()
         if self.conflicts.count() > 0:
-            detail_string += f"\n{_('Conflicts')}: {', '.join(str(c) for c in self.conflicts.all())}"
+            for c in self.conflicts.all():
+                conflicts.add(str(c))
+        if self.conflict.count() > 0:
+            for c in self.conflict.all():
+                conflicts.add(str(c))
+        if len(conflicts) > 0:
+            conflicts = list(conflicts)
+            conflicts.sort()
+            detail_string += f"\n{_('Conflicts')}: {', '.join(conflicts)}"
+
         if self.prerequisites.count() > 0:
             detail_string += f"\n{_('Prerequisites')}: {', '.join(str(p) for p in self.prerequisites.all())}"
         detail_string += f"\n{_('Availabilities')}: \n{availabilities}"
@@ -421,7 +985,7 @@ class AK(models.Model):
         Get a list of stringified representations of all owners
 
         :return: list of owners
-        :rtype: List[str]
+        :rtype: list[str]
         """
         return ", ".join(str(owner) for owner in self.owners.all())
 
@@ -431,7 +995,7 @@ class AK(models.Model):
         Get a list of stringified representations of all durations of associated slots
 
         :return: list of durations
-        :rtype: List[str]
+        :rtype: list[str]
         """
         return ", ".join(str(slot.duration_simplified) for slot in self.akslot_set.select_related('event').all())
 
@@ -489,7 +1053,7 @@ class AK(models.Model):
             return reverse_lazy('submit:ak_detail', kwargs={'event_slug': self.event.slug, 'pk': self.id})
         return self.edit_url
 
-    def save(self, force_insert=False, force_update=False, using=None, update_fields=None):
+    def save(self, *args, force_insert=False, force_update=False, using=None, update_fields=None):
         # Auto-Generate Link if not set yet
         if self.link == "":
             link = self.event.base_url + self.name.replace(" ", "_")
@@ -498,7 +1062,8 @@ class AK(models.Model):
             # Tell Django that we have updated the link field
             if update_fields is not None:
                 update_fields = {"link"}.union(update_fields)
-        super().save(force_insert, force_update, using, update_fields)
+        super().save(*args,
+                     force_insert=force_insert, force_update=force_update, using=using, update_fields=update_fields)
 
 
 class Room(models.Model):
@@ -536,6 +1101,43 @@ class Room(models.Model):
     def __str__(self):
         return self.title
 
+    def as_json_dict(self) -> dict[str, Any]:
+        """Return a json representation of this room object.
+
+        :return: The json dict representation is constructed
+            following the input specification of the KoMa conference optimizer, cf.
+            https://github.com/Die-KoMa/ak-plan-optimierung/wiki/Input-&-output-format
+        :rtype: dict[str, Any]
+        """
+        # local import to prevent cyclic import
+        # pylint: disable=import-outside-toplevel
+        from AKModel.availability.models import Availability
+
+        # check if room is available for the whole event
+        # -> no time constraint needs to be introduced
+        if Availability.is_event_covered(self.event, self.availabilities.all()):
+            time_constraints = []
+        else:
+            time_constraints = [f"availability-room-{self.pk}"]
+
+        data = {
+            "id": self.pk,
+            "info": {
+                "name": self.name,
+            },
+            "capacity": self.capacity,
+            "fulfilled_room_constraints": list(self.properties.values_list("name", flat=True)),
+            "time_constraints": time_constraints
+        }
+
+        data["fulfilled_room_constraints"].append(f"fixed-room-{self.pk}")
+
+        if not any(constr.startswith("proxy") for constr in data["fulfilled_room_constraints"]):
+            data["fulfilled_room_constraints"].append("no-proxy")
+
+        data["fulfilled_room_constraints"].sort()
+        return data
+
 
 class AKSlot(models.Model):
     """ An AK Mapping matches an AK to a room during a certain time.
@@ -615,7 +1217,7 @@ class AKSlot(models.Model):
 
     def overlaps(self, other: "AKSlot"):
         """
-        Check wether two slots overlap
+        Check whether two slots overlap
 
         :param other: second slot to compare with
         :return: true if they overlap, false if not:
@@ -623,14 +1225,87 @@ class AKSlot(models.Model):
         """
         return self.start < other.end <= self.end or self.start <= other.start < self.end
 
-    def save(self, force_insert=False, force_update=False, using=None, update_fields=None):
+    def save(self, *args, force_insert=False, force_update=False, using=None, update_fields=None):
         # Make sure duration is not longer than the event
         if update_fields is None or 'duration' in update_fields:
             event_duration = self.event.end - self.event.start
             event_duration_hours = event_duration.days * 24 + event_duration.seconds // 3600
             self.duration = min(self.duration, event_duration_hours)
-        super().save(force_insert, force_update, using, update_fields)
+        super().save(*args,
+                     force_insert=force_insert, force_update=force_update, using=using, update_fields=update_fields)
+
+    def as_json_dict(self) -> dict[str, Any]:
+        """Return a json representation of the AK object of this slot.
+
+        :return: The json dict representation is constructed
+            following the input specification of the KoMa conference optimizer, cf.
+            https://github.com/Die-KoMa/ak-plan-optimierung/wiki/Input-&-output-format
+        :rtype: dict[str, Any]
+        """
+        # local import to prevent cyclic import
+        # pylint: disable=import-outside-toplevel
+        from AKModel.availability.models import Availability
 
+        # check if ak resp. owner is available for the whole event
+        # -> no time constraint needs to be introduced
+
+        if self.fixed and self.start is not None:
+            ak_time_constraints = [f"fixed-akslot-{self.id}"]
+        elif not Availability.is_event_covered(self.event, self.ak.availabilities.all()):
+            ak_time_constraints = [f"availability-ak-{self.ak.pk}"]
+        else:
+            ak_time_constraints = []
+
+        def _owner_time_constraints(owner: AKOwner):
+            owner_avails = owner.availabilities.all()
+            if not owner_avails or Availability.is_event_covered(self.event, owner_avails):
+                return []
+            return [f"availability-person-{owner.pk}"]
+
+        conflict_slots = AKSlot.objects.filter(ak__in=self.ak.conflicts.all())
+        dependency_slots = AKSlot.objects.filter(ak__in=self.ak.prerequisites.all())
+        other_ak_slots = AKSlot.objects.filter(ak=self.ak).exclude(pk=self.pk)
+
+        ceil_offet_eps = decimal.Decimal(1e-4)
+
+        data = {
+            "id": self.pk,
+            "duration": math.ceil(self.duration / self.event.export_slot - ceil_offet_eps),
+            "properties": {
+                "conflicts": list((conflict_slots | other_ak_slots).values_list("pk", flat=True).order_by()),
+                "dependencies": list(dependency_slots.values_list("pk", flat=True).order_by()),
+            },
+            "room_constraints": list(self.ak.requirements.values_list("name", flat=True).order_by()),
+            "time_constraints": ["resolution"] if self.ak.reso else [],
+            "info": {
+                "name": self.ak.name,
+                "head": ", ".join([str(owner) for owner in self.ak.owners.order_by().all()]),
+                "description": self.ak.description,
+                "reso": self.ak.reso,
+                "duration_in_hours": float(self.duration),
+                "django_ak_id": self.ak.pk,
+                "types": list(self.ak.types.values_list("name", flat=True).order_by()),
+                },
+            }
+
+        data["time_constraints"].extend(ak_time_constraints)
+        for owner in self.ak.owners.all():
+            data["time_constraints"].extend(_owner_time_constraints(owner))
+
+        if self.ak.category:
+            category_constraints = AKCategory.create_category_optimizer_constraints([self.ak.category])
+            data["time_constraints"].extend(category_constraints)
+
+        if self.fixed and self.room is not None:
+            data["room_constraints"].append(f"fixed-room-{self.room.pk}")
+
+        if not any(constr.startswith("proxy") for constr in data["room_constraints"]):
+            data["room_constraints"].append("no-proxy")
+
+        data["room_constraints"].sort()
+        data["time_constraints"].sort()
+
+        return data
 
 class AKOrgaMessage(models.Model):
     """
@@ -664,6 +1339,7 @@ class ConstraintViolation(models.Model):
     Depending on the type, different fields (references to other models) will be filled. Each violation should always
     be related to an event and at least on other instance of a causing entity
     """
+
     class Meta:
         verbose_name = _('Constraint Violation')
         verbose_name_plural = _('Constraint Violations')
@@ -680,7 +1356,7 @@ class ConstraintViolation(models.Model):
         AK_CONFLICT_COLLISION = 'acc', _('AK Slot is scheduled at the same time as an AK listed as a conflict')
         AK_BEFORE_PREREQUISITE = 'abp', _('AK Slot is scheduled before an AK listed as a prerequisite')
         AK_AFTER_RESODEADLINE = 'aar', _(
-            'AK Slot for AK with intention to submit a resolution is scheduled after resolution deadline')
+                'AK Slot for AK with intention to submit a resolution is scheduled after resolution deadline')
         AK_CATEGORY_MISMATCH = 'acm', _('AK Slot in a category is outside that categories availabilities')
         AK_SLOT_COLLISION = 'asc', _('Two AK Slots for the same AK scheduled at the same time')
         ROOM_CAPACITY_EXCEEDED = 'rce', _('Room does not have enough space for interest in scheduled AK Slot')
@@ -881,6 +1557,7 @@ class DefaultSlot(models.Model):
     Model representing a default slot,
     i.e., a prefered slot to use for typical AKs in the schedule to guarantee enough breaks etc.
     """
+
     class Meta:
         verbose_name = _('Default Slot')
         verbose_name_plural = _('Default Slots')
@@ -893,7 +1570,8 @@ class DefaultSlot(models.Model):
                               help_text=_('Associated event'))
 
     primary_categories = models.ManyToManyField(to=AKCategory, verbose_name=_('Primary categories'), blank=True,
-                                            help_text=_('Categories that should be assigned to this slot primarily'))
+                                                help_text=_(
+                                                        'Categories that should be assigned to this slot primarily'))
 
     @property
     def start_simplified(self) -> str:
@@ -925,3 +1603,126 @@ class DefaultSlot(models.Model):
 
     def __str__(self):
         return f"{self.event}: {self.start_simplified} - {self.end_simplified}"
+
+
+class EventParticipant(models.Model):
+    """ A participant describes a person taking part in an event."""
+
+    class Meta:
+        verbose_name = _('Participant')
+        verbose_name_plural = _('Participants')
+        ordering = ['name']
+
+    name = models.CharField(max_length=64, blank=True, verbose_name=_('Nickname'),
+                            help_text=_('Name to identify a participant by (in case of questions from the organizers)'))
+    institution = models.CharField(max_length=128, blank=True, verbose_name=_('Institution'), help_text=_('Uni etc.'))
+
+    event = models.ForeignKey(to=Event, on_delete=models.CASCADE, verbose_name=_('Event'),
+                              help_text=_('Associated event'))
+
+    requirements = models.ManyToManyField(to=AKRequirement, blank=True, verbose_name=_('Requirements'),
+                                          help_text=_("Participant's Requirements"))
+
+    def __str__(self) -> str:
+        string = _("Anonymous {pk}").format(pk=self.pk) if not self.name else self.name
+        if self.institution:
+            string += f" ({self.institution})"
+        return string
+
+    @property
+    def availabilities(self):
+        """
+        Get all availabilities associated to this EventParticipant
+        :return: availabilities
+        :rtype: QuerySet[Availability]
+        """
+        return "Availability".objects.filter(participant=self)
+
+    def as_json_dict(self) -> dict[str, Any]:
+        """Return a json representation of this participant object.
+
+        :return: The json dict representation is constructed
+            following the input specification of the KoMa conference optimizer, cf.
+            https://github.com/Die-KoMa/ak-plan-optimierung/wiki/Input-&-output-format
+        :rtype: dict[str, Any]
+        """
+        # local import to prevent cyclic import
+        # pylint: disable=import-outside-toplevel
+        from AKModel.availability.models import Availability
+
+        data = {
+            "id": self.pk,
+            "info": {"name": str(self)},
+            "room_constraints": list(self.requirements.values_list("name", flat=True).order_by()),
+            "time_constraints": [],
+        }
+        data["preferences"] = [
+            pref.as_json_dict()
+            for pref in AKPreference.objects.filter(
+                participant=self, preference__gt=0
+            ).select_related("slot").order_by()
+        ]
+
+        avails = self.availabilities.all()
+        if avails and not Availability.is_event_covered(self.event, avails):
+            # participant has restricted availability
+            if AKPreference.objects.filter(
+                event=self.event,
+                participant=self,
+                preference=AKPreference.PreferenceLevel.REQUIRED,
+            ):
+                # partipant is actually required for AKs
+                data["time_constraints"].append(f"availability-participant-{self.pk}")
+
+        data["time_constraints"].sort()
+        return data
+
+
+class AKPreference(models.Model):
+    """Model representing the preference of a participant to an AK."""
+
+    class Meta:
+        verbose_name = _('AK Preference')
+        verbose_name_plural = _('AK Preferences')
+        unique_together = [['event', 'participant', 'slot']]
+
+    event = models.ForeignKey(to=Event, on_delete=models.CASCADE, verbose_name=_('Event'),
+                              help_text=_('Associated event'))
+
+    participant = models.ForeignKey(to=EventParticipant, on_delete=models.CASCADE, verbose_name=_('Participant'),
+                              help_text=_('Participant this preference belongs to'))
+
+    slot = models.ForeignKey(to=AKSlot, on_delete=models.CASCADE, verbose_name=_('AK Slot'),
+                           help_text=_('AK Slot this preference belongs to'))
+
+    class PreferenceLevel(models.IntegerChoices):
+        """
+        Possible preference values
+        """
+        IGNORE = 0, _('Ignore')
+        PREFER = 1, _('Prefer')
+        STRONG_PREFER = 2, _("Strong prefer")
+        REQUIRED = 3, _("Required")
+
+    preference = models.PositiveSmallIntegerField(verbose_name=_('Preference'), choices=PreferenceLevel.choices,
+                                             help_text=_('Preference level for the AK'),
+                                             blank=False,
+                                             default=PreferenceLevel.IGNORE)
+
+    def __str__(self) -> str:
+        return "AKPreference: " + json.dumps(self.as_json_dict())
+
+    def as_json_dict(self) -> dict[str, int | bool]:
+        """Return a json representation of this AKPreference object.
+
+        :return: The json dict representation is constructed
+            following the input specification of the KoMa conference optimizer, cf.
+            https://github.com/Die-KoMa/ak-plan-optimierung/wiki/Input-&-output-format
+        :rtype: dict[str, Any]
+        """
+        preference_score = self.preference if self.preference != self.PreferenceLevel.REQUIRED else -1
+        return {
+            "ak_id": self.slot.pk,
+            "required": self.preference == self.PreferenceLevel.REQUIRED,
+            "preference_score": preference_score
+        }

AKModel/templates/admin/AKModel/ak_json_export.html

+{% extends "admin/base_site.html" %}
+
+{% load tz %}
+
+{% block content %}
+
+<div class="mb-3">
+  <label for="export_single_line" class="form-label">Exported JSON:</label>
+  <input readonly type="text" name="export_single_line" class="form-control form-control-sm" value="{{ json_data_oneline }}"  style="font-family:var(--font-family-monospace);">
+</div>
+
+<div class="mb-3">
+  <label class="form-label">Exported JSON (indented for better readability):</label>
+  <pre class="prettyprint border rounded p-2">{{ json_data }}</pre>
+</div>
+
+<script>
+  $(document).ready(function() {
+    // JSON highlighting.
+    prettyPrint();
+    }
+  )
+</script>
+{% endblock %}

AKModel/templates/admin/AKModel/import_json.html

+{% extends "admin/base_site.html" %}
+{% load tags_AKModel %}
+
+{% load i18n %}
+{% load django_bootstrap5 %}
+{% load fontawesome_6 %}
+
+
+{% block title %}{{event}}: {{ title }}{% endblock %}
+
+{% block content %}
+    {% block action_preview %}
+        <p>
+            {{ preview|linebreaksbr }}
+        </p>
+    {% endblock %}
+
+    <form enctype="multipart/form-data" method="post">{% csrf_token %}
+        {% bootstrap_form form %}
+
+        <div class="float-end">
+            <button type="submit" class="save btn btn-success" value="Submit">
+                {% fa6_icon "check" 'fas' %} {% trans "Confirm" %}
+            </button>
+        </div>
+        <a href="javascript:history.back()" class="btn btn-info">
+            {% fa6_icon "times" 'fas' %} {% trans "Cancel" %}
+        </a>
+    </form>
+{% endblock %}

AKModel/tests/test_json_export.py

+import json
+import math
+from collections import defaultdict
+from collections.abc import Iterable
+from datetime import datetime, timedelta
+from itertools import chain
+
+from bs4 import BeautifulSoup
+from django.contrib.auth import get_user_model
+from django.test import TestCase
+from django.urls import reverse
+from jsonschema.exceptions import best_match
+
+from AKModel.availability.models import Availability
+from AKModel.models import (
+    AK,
+    AKCategory,
+    AKOwner,
+    AKPreference,
+    AKSlot,
+    DefaultSlot,
+    Event,
+    EventParticipant,
+    Room,
+)
+from AKModel.utils import construct_schema_validator
+
+
+class JSONExportTest(TestCase):
+    """Test if JSON export is correct.
+
+    It tests if the output conforms to the KoMa specification:
+    https://github.com/Die-KoMa/ak-plan-optimierung/wiki/Input-&-output-format
+    """
+
+    fixtures = ["model.json"]
+
+    @classmethod
+    def setUpTestData(cls):
+        """Shared set up by initializing admin user."""
+        cls.admin_user = get_user_model().objects.create(
+            username="Test Admin User",
+            email="testadmin@example.com",
+            password="adminpw",
+            is_staff=True,
+            is_superuser=True,
+            is_active=True,
+        )
+
+        cls.json_export_validator = construct_schema_validator(
+            "solver-input-export.schema.json"
+        )
+
+    def setUp(self):
+        self.client.force_login(self.admin_user)
+        self.export_dict = {}
+        self.export_objects = {
+            "aks": {},
+            "rooms": {},
+            "participants": {},
+        }
+
+        self.ak_slots: Iterable[AKSlot] = []
+        self.rooms: Iterable[Room] = []
+        self.participants: Iterable[EventParticipant] = []
+        self.owners: Iterable[AKOwner] = []
+        self.slots_in_an_hour: float = 1.0
+        self.max_participant_pk = 0
+        self.event: Event | None = None
+
+    def set_up_event(self, event: Event) -> None:
+        """Set up by retrieving json export and initializing data."""
+
+        export_url = reverse("admin:ak_json_export", kwargs={"event_slug": event.slug})
+        response = self.client.get(export_url)
+
+        self.assertEqual(response.status_code, 200, "Export not working at all")
+
+        soup = BeautifulSoup(response.content, features="lxml")
+        self.export_dict = json.loads(soup.find("pre").string)
+
+        self.export_objects["aks"] = {ak["id"]: ak for ak in self.export_dict["aks"]}
+        self.export_objects["rooms"] = {
+            room["id"]: room for room in self.export_dict["rooms"]
+        }
+        self.export_objects["participants"] = {
+            participant["id"]: participant
+            for participant in self.export_dict["participants"]
+        }
+
+        self.ak_slots = (
+            AKSlot.objects.filter(event__slug=event.slug)
+            .select_related("ak")
+            .prefetch_related("ak__conflicts")
+            .prefetch_related("ak__prerequisites")
+            .all()
+        )
+        self.rooms = Room.objects.filter(event__slug=event.slug).all()
+        self.participants = EventParticipant.objects.filter(
+            event__slug=event.slug
+        ).all()
+        self.owners = AKOwner.objects.filter(event__slug=event.slug).all()
+
+        self.max_participant_pk = (
+            self.participants.latest("pk").pk if self.participants else 0
+        )
+
+        self.slots_in_an_hour = 1 / self.export_dict["timeslots"]["info"]["duration"]
+        self.event = event
+
+    def test_all_aks_exported(self):
+        """Test if exported AKs match AKSlots of Event."""
+        for event in Event.objects.all():
+            with self.subTest(event=event):
+                self.set_up_event(event=event)
+                self.assertEqual(
+                    {slot.pk for slot in self.ak_slots},
+                    self.export_objects["aks"].keys(),
+                    "Exported AKs does not match the AKSlots of the event",
+                )
+
+    def _check_uniqueness(self, lst, name: str, key: str | None = "id"):
+        if key is not None:
+            lst = [entry[key] for entry in lst]
+        self.assertEqual(len(lst), len(set(lst)), f"{name} IDs not unique!")
+
+    def _check_type(self, attr, cls, name: str, item: str) -> None:
+        self.assertTrue(isinstance(attr, cls), f"{item} {name} not a {cls}")
+
+    def _check_lst(
+        self, lst: list[str], name: str, item: str, contained_type=str
+    ) -> None:
+        self.assertTrue(isinstance(lst, list), f"{item} {name} not a list")
+        self.assertTrue(
+            all(isinstance(c, contained_type) for c in lst),
+            f"{item} has non-{contained_type} {name}",
+        )
+        if contained_type in {str, int}:
+            self._check_uniqueness(lst, name, key=None)
+
+    def test_conformity_to_schema(self):
+        """Test if JSON structure and types conform to schema."""
+        for event in Event.objects.all():
+            with self.subTest(event=event):
+                self.set_up_event(event=event)
+
+                error = best_match(
+                    self.json_export_validator.iter_errors(self.export_dict)
+                )
+                msg = "" if not error else f"{error.message} at {error.json_path}"
+                self.assertFalse(error, msg)
+
+    def test_id_uniqueness(self):
+        """Test if objects are only exported once."""
+        for event in Event.objects.all():
+            with self.subTest(event=event):
+                self.set_up_event(event=event)
+
+                self._check_uniqueness(self.export_dict["aks"], "AKs")
+                self._check_uniqueness(self.export_dict["rooms"], "Rooms")
+                self._check_uniqueness(self.export_dict["participants"], "Participants")
+
+                self._check_uniqueness(
+                    chain.from_iterable(self.export_dict["timeslots"]["blocks"]),
+                    "Timeslots",
+                )
+
+    def test_timeslot_ids_consecutive(self):
+        """Test if Timeslots ids are chronologically consecutive."""
+        for event in Event.objects.all():
+            with self.subTest(event=event):
+                self.set_up_event(event=event)
+
+                prev_id = None
+                for timeslot in chain.from_iterable(
+                    self.export_dict["timeslots"]["blocks"]
+                ):
+                    if prev_id is not None:
+                        self.assertLess(
+                            prev_id,
+                            timeslot["id"],
+                            "timeslot ids must be increasing",
+                        )
+                    prev_id = timeslot["id"]
+
+    def test_general_conformity_to_spec(self):
+        """Test if rest of JSON structure and types conform to standard."""
+        for event in Event.objects.all():
+            with self.subTest(event=event):
+                self.set_up_event(event=event)
+
+                info_keys = {"title": "name", "slug": "slug"}
+                for attr in ["contact_email", "place"]:
+                    if hasattr(self.event, attr) and getattr(self.event, attr):
+                        info_keys[attr] = attr
+                self.assertEqual(
+                    self.export_dict["info"].keys(),
+                    info_keys.keys(),
+                    "info keys not as expected",
+                )
+                for attr, attr_field in info_keys.items():
+                    self.assertEqual(
+                        getattr(self.event, attr_field), self.export_dict["info"][attr]
+                    )
+
+    def test_ak_durations(self):
+        """Test if all AK durations are correct."""
+        for event in Event.objects.all():
+            with self.subTest(event=event):
+                self.set_up_event(event=event)
+
+                for slot in self.ak_slots:
+                    ak = self.export_objects["aks"][slot.pk]
+
+                    self.assertLessEqual(
+                        float(slot.duration) * self.slots_in_an_hour - 1e-4,
+                        ak["duration"],
+                        "Slot duration is too short",
+                    )
+
+                    self.assertEqual(
+                        math.ceil(float(slot.duration) * self.slots_in_an_hour - 1e-4),
+                        ak["duration"],
+                        "Slot duration is wrong",
+                    )
+
+                    self.assertEqual(
+                        float(slot.duration),
+                        ak["info"]["duration_in_hours"],
+                        "Slot duration_in_hours is wrong",
+                    )
+
+    def test_ak_conflicts(self):
+        """Test if all AK conflicts are correct."""
+        for event in Event.objects.all():
+            with self.subTest(event=event):
+                self.set_up_event(event=event)
+
+                for slot in self.ak_slots:
+                    ak = self.export_objects["aks"][slot.pk]
+                    conflict_slots = set(
+                        self.ak_slots.filter(
+                            ak__in=slot.ak.conflicts.all()
+                        ).values_list("pk", flat=True)
+                    )
+
+                    other_ak_slots = (
+                        self.ak_slots.filter(ak=slot.ak)
+                        .exclude(pk=slot.pk)
+                        .values_list("pk", flat=True)
+                    )
+                    conflict_slots.update(other_ak_slots)
+
+                    self.assertEqual(
+                        conflict_slots,
+                        set(ak["properties"]["conflicts"]),
+                        f"Conflicts for slot {slot.pk} not as expected",
+                    )
+
+    def test_ak_depenedencies(self):
+        """Test if all AK dependencies are correct."""
+        for event in Event.objects.all():
+            with self.subTest(event=event):
+                self.set_up_event(event=event)
+
+                for slot in self.ak_slots:
+                    ak = self.export_objects["aks"][slot.pk]
+                    dependency_slots = self.ak_slots.filter(
+                        ak__in=slot.ak.prerequisites.all()
+                    ).values_list("pk", flat=True)
+
+                    self.assertEqual(
+                        set(dependency_slots),
+                        set(ak["properties"]["dependencies"]),
+                        f"Dependencies for slot {slot.pk} not as expected",
+                    )
+
+    def test_ak_reso(self):
+        """Test if resolution intent of AKs is correctly exported."""
+        for event in Event.objects.all():
+            with self.subTest(event=event):
+                self.set_up_event(event=event)
+
+                for slot in self.ak_slots:
+                    ak = self.export_objects["aks"][slot.pk]
+                    self.assertEqual(slot.ak.reso, ak["info"]["reso"])
+                    self.assertEqual(
+                        slot.ak.reso, "resolution" in ak["time_constraints"]
+                    )
+
+    def test_ak_info(self):
+        """Test if contents of AK info dict is correct."""
+        for event in Event.objects.all():
+            with self.subTest(event=event):
+                self.set_up_event(event=event)
+
+                for slot in self.ak_slots:
+                    ak = self.export_objects["aks"][slot.pk]
+                    self.assertEqual(ak["info"]["name"], slot.ak.name)
+                    self.assertEqual(
+                        ak["info"]["head"], ", ".join(map(str, slot.ak.owners.all()))
+                    )
+                    self.assertEqual(ak["info"]["description"], slot.ak.description)
+                    self.assertEqual(ak["info"]["django_ak_id"], slot.ak.pk)
+                    self.assertEqual(
+                        ak["info"]["types"],
+                        list(slot.ak.types.values_list("name", flat=True).order_by()),
+                    )
+
+    def test_ak_room_constraints(self):
+        """Test if AK room constraints are exported as expected."""
+        for event in Event.objects.all():
+            with self.subTest(event=event):
+                self.set_up_event(event=event)
+
+                for slot in self.ak_slots:
+                    ak = self.export_objects["aks"][slot.pk]
+                    requirements = list(
+                        slot.ak.requirements.values_list("name", flat=True)
+                    )
+
+                    # proxy rooms
+                    if not any(constr.startswith("proxy") for constr in requirements):
+                        requirements.append("no-proxy")
+
+                    # fixed slot
+                    if slot.fixed and slot.room is not None:
+                        requirements.append(f"fixed-room-{slot.room.pk}")
+
+                    self.assertEqual(
+                        set(ak["room_constraints"]),
+                        set(requirements),
+                        f"Room constraints for slot {slot.pk} not as expected",
+                    )
+
+    def test_ak_time_constraints(self):
+        """Test if AK time constraints are exported as expected."""
+        for event in Event.objects.all():
+            with self.subTest(event=event):
+                self.set_up_event(event=event)
+
+                for slot in self.ak_slots:
+                    time_constraints = set()
+
+                    # add time constraints for AK category
+                    if slot.ak.category:
+                        category_constraints = AKCategory.create_category_optimizer_constraints(
+                            [slot.ak.category]
+                        )
+                        time_constraints |= category_constraints
+
+                    if slot.fixed and slot.start is not None:
+                        # fixed slot
+                        time_constraints.add(f"fixed-akslot-{slot.pk}")
+                    elif not Availability.is_event_covered(
+                        slot.event, slot.ak.availabilities.all()
+                    ):
+                        # restricted AK availability
+                        time_constraints.add(f"availability-ak-{slot.ak.pk}")
+
+                    for owner in slot.ak.owners.all():
+                        # restricted owner availability
+                        if not owner.availabilities.all():
+                            # no availability for owner -> assume full event is covered
+                            continue
+
+                        if not Availability.is_event_covered(
+                            slot.event, owner.availabilities.all()
+                        ):
+                            time_constraints.add(f"availability-person-{owner.pk}")
+
+                    ak = self.export_objects["aks"][slot.pk]
+                    self.assertEqual(
+                        set(ak["time_constraints"]),
+                        time_constraints,
+                        f"Time constraints for slot {slot.pk} not as expected",
+                    )
+
+    def test_all_rooms_exported(self):
+        """Test if exported Rooms match the rooms of Event."""
+        for event in Event.objects.all():
+            with self.subTest(event=event):
+                self.set_up_event(event=event)
+
+                self.assertEqual(
+                    {room.pk for room in self.rooms},
+                    self.export_objects["rooms"].keys(),
+                    "Exported Rooms do not match the Rooms of the event",
+                )
+
+    def test_room_capacity(self):
+        """Test if room capacity is exported correctly."""
+        for event in Event.objects.all():
+            with self.subTest(event=event):
+                self.set_up_event(event=event)
+
+                for room in self.rooms:
+                    export_room = self.export_objects["rooms"][room.pk]
+                    self.assertEqual(room.capacity, export_room["capacity"])
+
+    def test_room_info(self):
+        """Test if contents of Room info dict is correct."""
+        for event in Event.objects.all():
+            with self.subTest(event=event):
+                self.set_up_event(event=event)
+
+                for room in self.rooms:
+                    export_room = self.export_objects["rooms"][room.pk]
+                    self.assertEqual(room.name, export_room["info"]["name"])
+
+    def test_room_timeconstraints(self):
+        """Test if Room time constraints are exported as expected."""
+        for event in Event.objects.all():
+            with self.subTest(event=event):
+                self.set_up_event(event=event)
+
+                for room in self.rooms:
+                    time_constraints = set()
+
+                    # test if time availability of room is restricted
+                    if not Availability.is_event_covered(
+                        event, room.availabilities.all()
+                    ):
+                        time_constraints.add(f"availability-room-{room.pk}")
+
+                    export_room = self.export_objects["rooms"][room.pk]
+                    self.assertEqual(
+                        time_constraints, set(export_room["time_constraints"])
+                    )
+
+    def test_room_fulfilledroomconstraints(self):
+        """Test if room constraints fulfilled by Room are correct."""
+        for event in Event.objects.all():
+            with self.subTest(event=event):
+                self.set_up_event(event=event)
+
+                for room in self.rooms:
+                    # room properties
+                    fulfilled_room_constraints = set(
+                        room.properties.values_list("name", flat=True)
+                    )
+
+                    # proxy rooms
+                    if not any(
+                        constr.startswith("proxy")
+                        for constr in fulfilled_room_constraints
+                    ):
+                        fulfilled_room_constraints.add("no-proxy")
+
+                    fulfilled_room_constraints.add(f"fixed-room-{room.pk}")
+
+                    export_room = self.export_objects["rooms"][room.pk]
+                    self.assertEqual(
+                        fulfilled_room_constraints,
+                        set(export_room["fulfilled_room_constraints"]),
+                    )
+
+    def _get_timeslot_start_end(self, timeslot):
+        start = datetime.strptime(timeslot["info"]["start"], "%Y-%m-%d %H:%M").replace(
+            tzinfo=self.event.timezone
+        )
+        end = datetime.strptime(timeslot["info"]["end"], "%Y-%m-%d %H:%M").replace(
+            tzinfo=self.event.timezone
+        )
+        return start, end
+
+    def _get_cat_availability_in_export(self):
+        export_slot_cat_avails = defaultdict(list)
+        for timeslot in chain.from_iterable(self.export_dict["timeslots"]["blocks"]):
+            for constr in timeslot["fulfilled_time_constraints"]:
+                if constr.startswith("availability-cat-"):
+                    cat_name = constr[len("availability-cat-") :]
+                    start, end = self._get_timeslot_start_end(timeslot)
+                    export_slot_cat_avails[cat_name].append(
+                        Availability(event=self.event, start=start, end=end)
+                    )
+        return {
+            cat_name: Availability.union(avail_lst)
+            for cat_name, avail_lst in export_slot_cat_avails.items()
+        }
+
+    def _get_cat_availability(self):
+        if DefaultSlot.objects.filter(event=self.event).exists():
+            # Event has default slots -> use them for category availability
+            default_slots_avails = defaultdict(list)
+            for def_slot in DefaultSlot.objects.filter(event=self.event).all():
+                avail = Availability(
+                    event=self.event,
+                    start=def_slot.start.astimezone(self.event.timezone),
+                    end=def_slot.end.astimezone(self.event.timezone),
+                )
+                for cat in def_slot.primary_categories.all():
+                    default_slots_avails[cat.name].append(avail)
+
+            return {
+                cat_name: Availability.union(avail_lst)
+                for cat_name, avail_lst in default_slots_avails.items()
+            }
+
+        # Event has no default slots -> all categories available through whole event
+        start = self.event.start.astimezone(self.event.timezone)
+        end = self.event.end.astimezone(self.event.timezone)
+        delta = (end - start).total_seconds()
+
+        # tweak event end
+        # 1. shorten event to match discrete slot grid
+        slot_seconds = 3600 / self.slots_in_an_hour
+        remainder_seconds = delta % slot_seconds
+        remainder_seconds += 1  # add a second to compensate rounding errs
+        end -= timedelta(seconds=remainder_seconds)
+
+        # set seconds and microseconds to 0 as they are not exported to the json
+        start -= timedelta(seconds=start.second, microseconds=start.microsecond)
+        end -= timedelta(seconds=end.second, microseconds=end.microsecond)
+        event_avail = Availability(event=self.event, start=start, end=end)
+
+        category_names = AKCategory.objects.filter(event=self.event).values_list(
+            "name", flat=True
+        )
+        return {cat_name: [event_avail] for cat_name in category_names}
+
+    def test_timeslots_consecutive(self):
+        """Test if consecutive timeslots in JSON are in fact consecutive."""
+        for event in Event.objects.all():
+            with self.subTest(event=event):
+                self.set_up_event(event=event)
+
+                prev_end = None
+                for timeslot in chain.from_iterable(
+                    self.export_dict["timeslots"]["blocks"]
+                ):
+                    start, end = self._get_timeslot_start_end(timeslot)
+                    self.assertLess(start, end)
+
+                    delta = end - start
+                    self.assertAlmostEqual(
+                        delta.total_seconds() / (3600), 1 / self.slots_in_an_hour
+                    )
+
+                    if prev_end is not None:
+                        self.assertLessEqual(prev_end, start)
+                    prev_end = end
+
+    def test_block_cover_categories(self):
+        """Test if blocks covers all default slot resp. whole event per category."""
+        for event in Event.objects.all():
+            with self.subTest(event=event):
+                self.set_up_event(event=event)
+                category_names = AKCategory.objects.filter(event=event).values_list(
+                    "name", flat=True
+                )
+
+                export_cat_avails = self._get_cat_availability_in_export()
+                cat_avails = self._get_cat_availability()
+
+                for cat_name in category_names:
+                    for avail in cat_avails[cat_name]:
+                        # check that all category availabilities are covered
+                        self.assertTrue(
+                            avail.is_covered(export_cat_avails[cat_name]),
+                            f"AKCategory {cat_name}: avail ({avail.start} - {avail.end}) "
+                            f"not covered by {[f'({a.start} - {a.end})' for a in export_cat_avails[cat_name]]}",
+                        )
+
+    def _is_restricted_and_contained_slot(
+        self, slot: Availability, availabilities: list[Availability]
+    ) -> bool:
+        """Test if object is not available for whole event and may happen during slot."""
+        return slot.is_covered(availabilities) and not Availability.is_event_covered(
+            self.event, availabilities
+        )
+
+    def _is_ak_fixed_in_slot(
+        self,
+        ak_slot: AKSlot,
+        timeslot_avail: Availability,
+    ) -> bool:
+        if not ak_slot.fixed or ak_slot.start is None:
+            return False
+        ak_slot_avail = Availability(
+            event=self.event,
+            start=ak_slot.start.astimezone(self.event.timezone),
+            end=ak_slot.end.astimezone(self.event.timezone),
+        )
+        return timeslot_avail.overlaps(ak_slot_avail, strict=True)
+
+    def test_timeslot_fulfilledconstraints(self):
+        """Test if fulfilled time constraints by timeslot are as expected."""
+        for event in Event.objects.all():
+            with self.subTest(event=event):
+                self.set_up_event(event=event)
+
+                cat_avails = self._get_cat_availability()
+                num_blocks = len(self.export_dict["timeslots"]["blocks"])
+                for block_idx, block in enumerate(
+                    self.export_dict["timeslots"]["blocks"]
+                ):
+                    for timeslot in block:
+                        start, end = self._get_timeslot_start_end(timeslot)
+                        timeslot_avail = Availability(
+                            event=self.event, start=start, end=end
+                        )
+
+                        fulfilled_time_constraints = set()
+
+                        # reso deadline
+                        if self.event.reso_deadline is not None:
+                            # timeslot ends before deadline
+                            if end < self.event.reso_deadline.astimezone(
+                                self.event.timezone
+                            ):
+                                fulfilled_time_constraints.add("resolution")
+
+                        # add category constraints
+                        fulfilled_time_constraints |= (
+                            AKCategory.create_category_optimizer_constraints(
+                                [
+                                    cat
+                                    for cat in AKCategory.objects.filter(
+                                        event=self.event
+                                    ).all()
+                                    if timeslot_avail.is_covered(cat_avails[cat.name])
+                                ]
+                            )
+                        )
+
+                        # add owner constraints
+                        fulfilled_time_constraints |= {
+                            f"availability-person-{owner.id}"
+                            for owner in self.owners
+                            if self._is_restricted_and_contained_slot(
+                                timeslot_avail,
+                                Availability.union(owner.availabilities.all()),
+                            )
+                        }
+
+                        # add room constraints
+                        fulfilled_time_constraints |= {
+                            f"availability-room-{room.id}"
+                            for room in self.rooms
+                            if self._is_restricted_and_contained_slot(
+                                timeslot_avail,
+                                Availability.union(room.availabilities.all()),
+                            )
+                        }
+
+                        # add participant constraints
+                        fulfilled_time_constraints |= {
+                            f"availability-participant-{participant.id}"
+                            for participant in self.participants
+                            if self._is_restricted_and_contained_slot(
+                                timeslot_avail,
+                                Availability.union(participant.availabilities.all()),
+                            )
+                        }
+
+                        # add ak constraints
+                        fulfilled_time_constraints |= {
+                            f"availability-ak-{ak.id}"
+                            for ak in AK.objects.filter(event=event)
+                            if self._is_restricted_and_contained_slot(
+                                timeslot_avail,
+                                Availability.union(ak.availabilities.all()),
+                            )
+                        }
+                        fulfilled_time_constraints |= {
+                            f"fixed-akslot-{slot.id}"
+                            for slot in self.ak_slots
+                            if self._is_ak_fixed_in_slot(slot, timeslot_avail)
+                        }
+
+                        fulfilled_time_constraints |= {
+                            f"notblock{idx}"
+                            for idx in range(num_blocks)
+                            if idx != block_idx
+                        }
+
+                        self.assertEqual(
+                            fulfilled_time_constraints,
+                            set(timeslot["fulfilled_time_constraints"]),
+                        )
+
+    def test_timeslots_info(self):
+        """Test timeslots info dict"""
+        for event in Event.objects.all():
+            with self.subTest(event=event):
+                self.set_up_event(event=event)
+
+                self.assertAlmostEqual(
+                    self.export_dict["timeslots"]["info"]["duration"],
+                    float(self.event.export_slot),
+                )
+
+                block_names = []
+                for block in self.export_dict["timeslots"]["blocks"]:
+                    if not block:
+                        continue
+
+                    block_start, _ = self._get_timeslot_start_end(block[0])
+                    _, block_end = self._get_timeslot_start_end(block[-1])
+
+                    start_day = block_start.strftime("%A, %d. %b")
+                    if block_start.date() == block_end.date():
+                        # same day
+                        time_str = (
+                            block_start.strftime("%H:%M")
+                            + " - "
+                            + block_end.strftime("%H:%M")
+                        )
+                    else:
+                        # different days
+                        time_str = (
+                            block_start.strftime("%a %H:%M")
+                            + " - "
+                            + block_end.strftime("%a %H:%M")
+                        )
+                    block_names.append([start_day, time_str])
+                self.assertEqual(
+                    block_names, self.export_dict["timeslots"]["info"]["blocknames"]
+                )
+
+    def _owner_has_ak(self, owner: AKOwner) -> bool:
+        owned_aks = self.ak_slots.filter(ak__owners=owner).all()
+        return bool(owned_aks)
+
+    def test_all_participants_exported(self):
+        """Test if exported Rooms match the rooms of Event."""
+        for event in Event.objects.all():
+            with self.subTest(event=event):
+                self.set_up_event(event=event)
+
+                participant_ids = set(self.participants.values_list("pk", flat=True))
+                for idx, owner in enumerate(self.owners, self.max_participant_pk + 1):
+                    if self._owner_has_ak(owner):
+                        participant_ids.add(idx)
+
+                self.assertEqual(
+                    participant_ids,
+                    self.export_objects["participants"].keys(),
+                    "Exported Participants does not match the Participants of the event",
+                )
+
+    def test_participant_info(self):
+        """Test if contents of participants info dict is correct."""
+        for event in Event.objects.all():
+            with self.subTest(event=event):
+                self.set_up_event(event=event)
+
+                for participant in self.participants:
+                    export_participant = self.export_objects["participants"][
+                        participant.pk
+                    ]
+                    self.assertEqual(
+                        str(participant), export_participant["info"]["name"]
+                    )
+
+                for idx, owner in enumerate(self.owners, self.max_participant_pk + 1):
+                    if not self._owner_has_ak(owner):
+                        continue
+                    export_participant = self.export_objects["participants"][idx]
+                    self.assertEqual(
+                        str(owner) + " [AKOwner]", export_participant["info"]["name"]
+                    )
+
+    def test_participant_timeconstraints(self):
+        """Test if participant time constraints are exported as expected."""
+        for event in Event.objects.all():
+            with self.subTest(event=event):
+                self.set_up_event(event=event)
+                for participant in self.participants:
+                    export_participant = self.export_objects["participants"][
+                        participant.pk
+                    ]
+
+                    time_constraints = set()
+                    participant_avails = participant.availabilities.all()
+                    if participant_avails and not Availability.is_event_covered(
+                        self.event, participant_avails
+                    ):
+                        # participant has restricted availability
+                        if AKPreference.objects.filter(
+                            event=self.event,
+                            participant=participant,
+                            preference=AKPreference.PreferenceLevel.REQUIRED,
+                        ):
+                            # partipant is actually required for AKs
+                            time_constraints.add(
+                                f"availability-participant-{participant.pk}"
+                            )
+
+                    self.assertEqual(
+                        set(export_participant["time_constraints"]), time_constraints
+                    )
+
+                # dummy participants have no time constraints
+                for idx, owner in enumerate(self.owners, self.max_participant_pk + 1):
+                    if not self._owner_has_ak(owner):
+                        continue
+                    export_participant = self.export_objects["participants"][idx]
+                    self.assertEqual(export_participant["time_constraints"], [])
+
+    def test_participant_roomconstraints(self):
+        """Test if participant room constraints are exported as expected."""
+        for event in Event.objects.all():
+            with self.subTest(event=event):
+                self.set_up_event(event=event)
+                for participant in self.participants:
+                    export_participant = self.export_objects["participants"][
+                        participant.pk
+                    ]
+                    room_constraints = [
+                        constr.name for constr in participant.requirements.all()
+                    ]
+                    self.assertCountEqual(
+                        export_participant["room_constraints"], room_constraints
+                    )
+
+                for idx, owner in enumerate(self.owners, self.max_participant_pk + 1):
+                    if not self._owner_has_ak(owner):
+                        continue
+                    export_participant = self.export_objects["participants"][idx]
+                    self.assertEqual(export_participant["room_constraints"], [])
+
+    def test_preferences(self):
+        """Test if preferences are exported as expected."""
+
+        def _preference_json(pref: AKPreference):
+            return {
+                "ak_id": pref.slot.pk,
+                "required": pref.preference == AKPreference.PreferenceLevel.REQUIRED,
+                "preference_score": (
+                    pref.preference
+                    if pref.preference != AKPreference.PreferenceLevel.REQUIRED
+                    else -1
+                ),
+            }
+
+        for event in Event.objects.all():
+            with self.subTest(event=event):
+                self.set_up_event(event=event)
+                for participant in self.participants:
+                    export_participant = self.export_objects["participants"][
+                        participant.pk
+                    ]
+                    preferences = [
+                        _preference_json(pref)
+                        for pref in AKPreference.objects.filter(
+                            participant=participant, preference__gt=0
+                        ).select_related("slot")
+                    ]
+                    self.assertCountEqual(
+                        export_participant["preferences"], preferences
+                    )
+
+                for idx, owner in enumerate(self.owners, self.max_participant_pk + 1):
+                    owned_slots = self.ak_slots.filter(ak__owners=owner).all()
+                    if not owned_slots:
+                        continue
+                    preferences = [
+                        {
+                            "ak_id": slot.pk,
+                            "required": True,
+                            "preference_score": -1,
+                        }
+                        for slot in owned_slots
+                    ]
+                    export_participant = self.export_objects["participants"][idx]
+                    self.assertCountEqual(
+                        export_participant["preferences"], preferences
+                    )