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/migrations/0068_aktype_slug.py

+# Generated by Django 5.1.6 on 2025-05-11 15:21
+
+from django.db import migrations, models
+
+
+def create_slugs(apps, schema_editor):
+    """
+    Automatically generate slugs from existing type names
+    """
+    AKType = apps.get_model("AKModel", "AKType")
+    for ak_type in AKType.objects.all():
+        slug = ak_type.name.lower().split(" ")[0]
+        ak_type.slug = slug[:30] if len(slug) > 30 else slug
+        ak_type.save()
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('AKModel', '0067_eventparticipant_requirements_and_more'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='aktype',
+            name='slug',
+            field=models.SlugField(max_length=30, null=True, verbose_name='Slug'),
+        ),
+        migrations.RunPython(create_slugs, migrations.RunPython.noop),
+        migrations.AlterUniqueTogether(
+            name='aktype',
+            unique_together={('event', 'name')},
+        ),
+        migrations.AlterField(
+            model_name='aktype',
+            name='slug',
+            field=models.SlugField(max_length=30, verbose_name='Slug'),
+        ),
+        migrations.AlterUniqueTogether(
+            name='aktype',
+            unique_together={('event', 'name'), ('event', 'slug')},
+        ),
+    ]

AKModel/migrations/0068_event_export_delete_preferences_participants.py

+# Generated by Django 5.2.1 on 2025-06-17 15:57
+
+import django.db.models.deletion
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('AKModel', '0067_eventparticipant_requirements_and_more'),
+        ('AKPreference', '0001_initial'),
+    ]
+
+    operations = [
+        migrations.RemoveField(
+            model_name='eventparticipant',
+            name='event',
+        ),
+        migrations.RemoveField(
+            model_name='eventparticipant',
+            name='requirements',
+        ),
+        migrations.RemoveField(
+            model_name='availability',
+            name='participant',
+        ),
+        migrations.AddField(
+            model_name='event',
+            name='poll_hidden',
+            field=models.BooleanField(default=True, help_text='Hides preference poll for non-staff users', verbose_name='Poll Hidden'),
+        ),
+        migrations.AddField(
+            model_name='event',
+            name='poll_published_at',
+            field=models.DateTimeField(blank=True, help_text='Timestamp at which the preference poll was published', null=True, verbose_name='Poll published at'),
+        ),
+        migrations.DeleteModel(
+            name='AKPreference',
+        ),
+        migrations.DeleteModel(
+            name='EventParticipant',
+        ),
+        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='AKPreference.eventparticipant', verbose_name='Participant'),
+        ),
+    ]

AKModel/migrations/0069_merge_20250617_1844.py

+# Generated by Django 5.2.1 on 2025-06-17 18:44
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('AKModel', '0068_aktype_slug'),
+        ('AKModel', '0068_event_export_delete_preferences_participants'),
+    ]
+
+    operations = [
+    ]

AKModel/migrations/0070_requirements_relevant_for_participants.py

+# Generated by Django 5.2.3 on 2025-06-18 10:47
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('AKModel', '0069_merge_20250617_1844'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='akrequirement',
+            name='relevant_for_participants',
+            field=models.BooleanField(default=False, help_text='Show this requirement when collecting participant preferences', verbose_name='Relevant for Participants?'),
+        ),
+    ]

AKModel/models.py

 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.conf import settings
+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):
     """
@@ -32,7 +141,10 @@ 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.'))
+                                          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.'))
 
@@ -43,16 +155,28 @@ 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'))
+
+    poll_hidden = models.BooleanField(verbose_name=_('Poll Hidden'),
+                                      help_text=_('Hides preference poll for non-staff users'),
+                                      default=True)
+    poll_published_at = models.DateTimeField(verbose_name=_('Poll published at'), blank=True, null=True,
+                                             help_text=_('Timestamp at which the preference poll 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')
@@ -83,11 +207,12 @@ 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,
-                                filter_func=lambda ak: True, hide_empty_categories=False):
+                                filter_func=lambda ak: True, hide_empty_categories=False,
+                                types=None, types_all_selected_only=False):
         """
         Get AKCategories as well as a list of AKs belonging to the category for this event
 
@@ -95,6 +220,12 @@ class Event(models.Model):
         :type wishes_seperately: bool
         :param filter_func: Optional filter predicate, only include AK in list if filter returns True
         :type filter_func: (AK)->bool
+        :param hide_empty_categories: If True, categories with no AKs will not be included in the result
+        :type hide_empty_categories: bool
+        :param types: Optional list of AK types to filter by, if None, all types are included
+        :type types: list[AKType] | None
+        :param types_all_selected_only: If True, only include AKs that have all of the selected types at the same time
+        :type types_all_selected_only: bool
         :return: list of category-AK-list-tuples, optionally the additional list of AK wishes
         :rtype: list[(AKCategory, list[AK])] [, list[AK]]
         """
@@ -106,7 +237,7 @@ class Event(models.Model):
         # A different behavior is needed depending on whether wishes should show up inside their categories
         # or as a separate category
 
-        def _get_category_aks(category):
+        def _get_category_aks(category, types):
             """
             Get all AKs belonging to a category
             Use joining and prefetching to reduce the number of necessary SQL queries
@@ -115,12 +246,18 @@ class Event(models.Model):
             :return: QuerySet over AKs
             :return: QuerySet[AK]
             """
-            return category.ak_set.select_related('event').prefetch_related('owners', 'akslot_set').all()
+            s = category.ak_set
+            if types is not None:
+                s = s.filter(types__in=types).distinct()
+                if types_all_selected_only:
+                    # TODO fix - this only works in very specific cases
+                    s = s.annotate(Count('types')).filter(types__count=len(types))
+            return s.select_related('event').prefetch_related('owners', 'akslot_set', 'types').all()
 
         if wishes_seperately:
             for category in categories:
                 ak_list = []
-                for ak in _get_category_aks(category):
+                for ak in _get_category_aks(category, types):
                     if filter_func(ak):
                         if ak.wish:
                             ak_wishes.append(ak)
@@ -132,7 +269,7 @@ class Event(models.Model):
 
         for category in categories:
             ak_list = []
-            for ak in _get_category_aks(category):
+            for ak in _get_category_aks(category, types):
                 if filter_func(ak):
                     ak_list.append(ak)
             if not hide_empty_categories or len(ak_list) > 0:
@@ -160,11 +297,271 @@ 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 apps.is_installed("AKSolverInterface") and check_for_data_inconsistency:
+            from AKSolverInterface.serializers import ExportEventSerializer   # pylint: disable=import-outside-toplevel
+            export_dict = ExportEventSerializer(self).data
+
+            if schedule["input"] != export_dict:
+                raise ValueError(_("Data has changed since the export. Reexport and run the solver again."))
+
+        slots_in_an_hour = 1.0 / 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
+
+    @property
+    def rooms(self):
+        """Ordered queryset of all rooms associated to this event."""
+        return Room.objects.filter(event=self).order_by()
+
+    @property
+    def slots(self):
+        """Ordered queryset of all AKSlots associated to this event."""
+        return AKSlot.objects.filter(event=self).order_by()
+
+    @property
+    def participants(self):
+        """Ordered queryset of all participants associated to this event."""
+        if apps.is_installed("AKPreference"):
+            # local import to prevent cyclic import
+            # pylint: disable=import-outside-toplevel
+            from AKPreference.models import EventParticipant
+            return EventParticipant.objects.filter(event=self).order_by()
+        return []
+
+    @property
+    def owners(self):
+        """Ordered queryset of all AK owners associated to this event."""
+        return AKOwner.objects.filter(event=self).order_by()
+
 
 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'))
@@ -243,8 +640,8 @@ 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'))
@@ -258,6 +655,20 @@ 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.
@@ -290,6 +701,8 @@ class AKRequirement(models.Model):
     """ An AKRequirement describes something needed to hold an AK, e.g. infrastructure.
     """
     name = models.CharField(max_length=128, verbose_name=_('Name'), help_text=_('Name of the Requirement'))
+    relevant_for_participants = models.BooleanField(default=False, verbose_name=_('Relevant for Participants?'),
+                                    help_text=_('Show this requirement when collecting participant preferences'))
 
     event = models.ForeignKey(to=Event, on_delete=models.CASCADE, verbose_name=_('Event'),
                               help_text=_('Associated event'))
@@ -304,23 +717,46 @@ class AKRequirement(models.Model):
         return self.name
 
 
+class AKType(models.Model):
+    """ An AKType allows to associate one or multiple types with an AK, e.g., to better describe the format of that AK
+    or to which group of people it is addressed. Types are specified per event and are an optional feature.
+    """
+    name = models.CharField(max_length=128, verbose_name=_('Name'), help_text=_('Name describing the type'))
+    slug = models.SlugField(max_length=30, blank=False, verbose_name=_('Slug'),)
+    event = models.ForeignKey(to=Event, on_delete=models.CASCADE, verbose_name=_('Event'),
+                              help_text=_('Associated event'))
+
+    class Meta:
+        verbose_name = _('AK Type')
+        verbose_name_plural = _('AK Types')
+        ordering = ['name']
+        unique_together = [['event', 'name'], ['event', 'slug']]
+
+    def __str__(self):
+        return self.name
+
+
 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'))
 
     owners = models.ManyToManyField(to=AKOwner, blank=True, verbose_name=_('Owners'),
                                     help_text=_('Those organizing the AK'))
 
-    # TODO generate automatically
+    # Will be automatically generated in save method if not set
     link = models.URLField(blank=True, verbose_name=_('Web Link'), help_text=_('Link to wiki page'))
     protocol_link = models.URLField(blank=True, verbose_name=_('Protocol Link'), help_text=_('Link to protocol'))
 
     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"))
     track = models.ForeignKey(to=AKTrack, blank=True, on_delete=models.SET_NULL, null=True, verbose_name=_('Track'),
                               help_text=_('Track the AK belongs to'))
 
@@ -338,8 +774,8 @@ 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'),
@@ -351,7 +787,7 @@ 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')
@@ -367,7 +803,7 @@ class AK(models.Model):
     @property
     def details(self):
         """
-        Generate a detailled string representation, e.g., for usage in scheduling
+        Generate a detailed string representation, e.g., for usage in scheduling
         :return: string representation of that AK with all details
         :rtype: str
         """
@@ -376,36 +812,66 @@ class AK(models.Model):
         from AKModel.availability.models import Availability
         availabilities = ', \n'.join(f'{a.simplified}' for a in Availability.objects.select_related('event')
                                      .filter(ak=self))
-        return f"""{self.name}{" (R)" if self.reso else ""}:
-        
+        detail_string = f"""{self.name}{" (R)" if self.reso else ""}:
+
         {self.owners_list}
 
-        {_('Interest')}: {self.interest}
-        {_("Requirements")}: {", ".join(str(r) for r in self.requirements.all())}  
-        {_("Conflicts")}: {", ".join(str(c) for c in self.conflicts.all())}  
-        {_("Prerequisites")}: {", ".join(str(p) for p in self.prerequisites.all())}
-        {_("Availabilities")}: \n{availabilities}"""
+        {_('Interest')}: {self.interest}"""
+        if self.requirements.count() > 0:
+            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:
+            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}"
+        return detail_string
 
     @property
     def owners_list(self):
         """
-        Get a list of stringified representations of all owners
+        Get a stringified list of stringified representations of all owners
 
-        :return: list of owners
-        :rtype: List[str]
+        :return: stringified list of owners
+        :rtype: str
         """
         return ", ".join(str(owner) for owner in self.owners.all())
 
     @property
     def durations_list(self):
         """
-        Get a list of stringified representations of all durations of associated slots
+        Get a stringified list of stringified representations of all durations of associated slots
 
-        :return: list of durations
-        :rtype: List[str]
+        :return: stringified list of durations
+        :rtype: str
         """
         return ", ".join(str(slot.duration_simplified) for slot in self.akslot_set.select_related('event').all())
 
+    @property
+    def types_list(self):
+        """
+        Get a stringified list of all types of this AK
+
+        :return: stringified list of types
+        :rtype: str
+        """
+        return ", ".join(str(t) for t in self.types.all())
+
     @property
     def wish(self):
         """
@@ -460,6 +926,18 @@ 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, *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(" ", "_")
+            # Truncate links longer than 200 characters (default length of URL fields in django)
+            self.link = link[:200]
+            # Tell Django that we have updated the link field
+            if update_fields is not None:
+                update_fields = {"link"}.union(update_fields)
+        super().save(*args,
+                     force_insert=force_insert, force_update=force_update, using=using, update_fields=update_fields)
+
 
 class Room(models.Model):
     """ A room describes where an AK can be held.
@@ -496,6 +974,32 @@ class Room(models.Model):
     def __str__(self):
         return self.title
 
+    def get_time_constraints(self) -> list[str]:
+        """Construct list of required time constraint labels."""
+        # 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}"]
+
+        return time_constraints
+
+    def get_fulfilled_room_constraints(self) -> list[str]:
+        """Construct list of fulfilled room constraint labels."""
+        fulfilled_room_constraints = list(self.properties.values_list("name", flat=True))
+        fulfilled_room_constraints.append(f"fixed-room-{self.pk}")
+
+        if not any(constr.startswith("proxy") for constr in fulfilled_room_constraints):
+            fulfilled_room_constraints.append("no-proxy")
+
+        fulfilled_room_constraints.sort()
+        return fulfilled_room_constraints
+
 
 class AKSlot(models.Model):
     """ An AK Mapping matches an AK to a room during a certain time.
@@ -575,7 +1079,7 @@ 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:
@@ -583,6 +1087,89 @@ class AKSlot(models.Model):
         """
         return self.start < other.end <= self.end or self.start <= other.start < self.end
 
+    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(*args,
+                     force_insert=force_insert, force_update=force_update, using=using, update_fields=update_fields)
+
+    def get_room_constraints(self, export_scheduled_aks_as_fixed: bool = False) -> list[str]:
+        """Construct list of required room constraint labels."""
+        room_constraints = list(self.ak.requirements.values_list("name", flat=True).order_by())
+        if (export_scheduled_aks_as_fixed or self.fixed) and self.room is not None:
+            room_constraints.append(f"fixed-room-{self.room.pk}")
+
+        if not any(constr.startswith("proxy") for constr in room_constraints):
+            room_constraints.append("no-proxy")
+
+        room_constraints.sort()
+        return room_constraints
+
+    def get_time_constraints(self, export_scheduled_aks_as_fixed: bool = False) -> list[str]:
+        """Construct list of required time constraint labels."""
+        # local import to prevent cyclic import
+        # pylint: disable=import-outside-toplevel
+        from AKModel.availability.models import Availability
+
+        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}"]
+
+        # check if ak resp. owner is available for the whole event
+        # -> no time constraint needs to be introduced
+        if (export_scheduled_aks_as_fixed or self.fixed) and self.start is not None:
+            time_constraints = [f"fixed-akslot-{self.id}"]
+        elif not Availability.is_event_covered(self.event, self.ak.availabilities.all()):
+            time_constraints = [f"availability-ak-{self.ak.pk}"]
+        else:
+            time_constraints = []
+
+        if self.ak.reso:
+            time_constraints.append("resolution")
+        for owner in self.ak.owners.all():
+            time_constraints.extend(_owner_time_constraints(owner))
+
+        if self.ak.category:
+            category_constraints = AKCategory.create_category_optimizer_constraints([self.ak.category])
+            time_constraints.extend(category_constraints)
+
+        time_constraints.sort()
+        return time_constraints
+
+    @property
+    def export_duration(self) -> int:
+        """Number of discrete export timeslots covered by this AKSlot."""
+        export_duration = self.duration / self.event.export_slot
+        # We need to return an int, so we round up.
+        # If the exact result for `export_duration` is an integer `k`,
+        # FLOP inaccuracies could yield `k + eps`. Then, rounding up
+        # would return `k + 1` instead of `k`. To avoid this, we subtract
+        # a small epsilon before rounding.
+        return math.ceil(export_duration - settings.EXPORT_CEIL_OFFSET_EPS)
+
+    @property
+    def type_names(self):
+        """Ordered queryset of the names of all types of this slot's AK."""
+        return self.ak.types.values_list("name", flat=True).order_by()
+
+    @property
+    def conflict_pks(self) -> list[int]:
+        """Ordered queryset of the PKs of all AKSlots that in conflict to this slot."""
+        conflict_slots = AKSlot.objects.filter(ak__in=self.ak.conflicts.all())
+        other_ak_slots = AKSlot.objects.filter(ak=self.ak).exclude(pk=self.pk)
+        return list((conflict_slots | other_ak_slots).values_list("pk", flat=True).order_by())
+
+    @property
+    def depencency_pks(self) -> list[int]:
+        """Ordered queryset of the PKs of all AKSlots that this slot depends on."""
+        dependency_slots = AKSlot.objects.filter(ak__in=self.ak.prerequisites.all())
+        return list(dependency_slots.values_list("pk", flat=True).order_by())
+
 
 class AKOrgaMessage(models.Model):
     """
@@ -595,6 +1182,8 @@ class AKOrgaMessage(models.Model):
     timestamp = models.DateTimeField(auto_now_add=True)
     event = models.ForeignKey(to=Event, on_delete=models.CASCADE, verbose_name=_('Event'),
                               help_text=_('Associated event'))
+    resolved = models.BooleanField(verbose_name=_('Resolved'), default=False,
+                                   help_text=_('This message has been resolved (no further action needed)'))
 
     class Meta:
         verbose_name = _('AK Orga Message')
@@ -614,6 +1203,7 @@ 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')
@@ -630,7 +1220,7 @@ 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')
@@ -831,6 +1421,7 @@ 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')
@@ -843,7 +1434,8 @@ 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:

AKModel/serializers.py

 from rest_framework import serializers
 
-from AKModel.models import AK, Room, AKSlot, AKTrack, AKCategory, AKOwner
+from AKModel.models import AK, AKCategory, AKOwner, AKSlot, AKTrack, Room
+
+
+class StringListField(serializers.ListField):
+    """List field containing strings."""
+
+    child = serializers.CharField()
+
+
+class IntListField(serializers.ListField):
+    """List field containing integers."""
+
+    child = serializers.IntegerField()
 
 
 class AKOwnerSerializer(serializers.ModelSerializer):

AKModel/templates/admin/AKModel/ak_csv_export.html

@@ -4,8 +4,8 @@
 
 {% block content %}
 <pre>
-title;duration;who;requirements;prerequisites;conflicts;availabilities;category;track;reso;notes;
-{% for slot in slots %}{{ slot.ak.short_name }};{{ slot.duration }};{{ slot.ak.owners.all|join:", " }};{{ slot.ak.requirements.all|join:", " }};{{ slot.ak.prerequisites.all|join:", " }};{{ slot.ak.conflicts.all|join:", " }};{% for a in slot.ak.availabilities.all %}{{ a.start | timezone:event.timezone | date:"l H:i"  }} - {{ a.end | timezone:event.timezone | date:"l H:i" }}, {% endfor %};{{ slot.ak.category }};{{ slot.ak.track }};{{ slot.ak.reso }};{{ slot.ak.notes }};
+title;duration;who;requirements;prerequisites;conflicts;availabilities;category;types;track;reso;notes;
+{% for slot in slots %}{{ slot.ak.short_name }};{{ slot.duration }};{{ slot.ak.owners.all|join:", " }};{{ slot.ak.requirements.all|join:", " }};{{ slot.ak.prerequisites.all|join:", " }};{{ slot.ak.conflicts.all|join:", " }};{% for a in slot.ak.availabilities.all %}{{ a.start | timezone:event.timezone | date:"l H:i"  }} - {{ a.end | timezone:event.timezone | date:"l H:i" }}, {% endfor %};{{ slot.ak.category }};{{ slot.ak.types.all|join:", " }};{{ slot.ak.track }};{{ slot.ak.reso }};{{ slot.ak.notes }};
 {% endfor %}
 </pre>
 {% endblock %}

AKModel/templates/admin/AKModel/aks_by_user.html

+{% extends "admin/base_site.html" %}
+{% load tags_AKModel %}
+
+{% load i18n %}
+{% load tz %}
+{% load fontawesome_6 %}
+
+{% block title %}{% trans "AKs by Owner" %}: {{owner}}{% endblock %}
+
+{% block content %}
+    {% timezone event.timezone %}
+        <h2>[{{event}}] <a href="{% url 'admin:AKModel_akowner_change' owner.pk %}">{{owner}}</a> - {% trans "AKs" %}</h2>
+
+        <div class="row mt-4">
+            <table class="table table-striped">
+                {% for ak in owner.ak_set.all %}
+                    <tr>
+                        <td>{{ ak }}</td>
+                        {% if "AKSubmission"|check_app_installed %}
+                            <td class="text-end">
+                                <a href="{{ ak.detail_url }}" data-bs-toggle="tooltip"
+                                   title="{% trans 'Details' %}"
+                                   class="btn btn-primary">{% fa6_icon 'info' 'fas' %}</a>
+                                {% if event.active %}
+                                    <a href="{{ ak.edit_url }}" data-bs-toggle="tooltip"
+                                       title="{% trans 'Edit' %}"
+                                       class="btn btn-success">{% fa6_icon 'pencil-alt' 'fas' %}</a>
+                                {% endif %}
+                            {% endif %}
+                        </td>
+                    </tr>
+                {% empty %}
+                    <tr><td>{% trans "This user does not have any AKs currently" %}</td></tr>
+                {% endfor %}
+            </table>
+        </div>
+    {% endtimezone %}
+{% endblock %}

AKModel/templates/admin/AKModel/event_wizard/activate.html

@@ -8,6 +8,11 @@
 
 {% block title %}{% trans "New event wizard" %}: {{ wizard_step_text }}{% endblock %}
 
+{% block extrahead %}
+    {{ block.super }}
+    {{ form.media }}
+{% endblock %}
+
 {% block content %}
     {% include "admin/AKModel/event_wizard/wizard_steps.html" %}
 
@@ -17,8 +22,6 @@
 
     <h5 class="mb-3">{% trans "Successfully imported.<br><br>Do you want to activate your event now?" %}</h5>
 
-    {{ form.media }}
-
     <form method="post">{% csrf_token %}
         {% bootstrap_form form %}
 

AKModel/templates/admin/AKModel/event_wizard/created_prepare_import.html

@@ -8,6 +8,11 @@
 
 {% block title %}{% trans "New event wizard" %}: {{ wizard_step_text }}{% endblock %}
 
+{% block extrahead %}
+    {{ block.super }}
+    {{ form.media }}
+{% endblock %}
+
 {% block content %}
     {% include "admin/AKModel/event_wizard/wizard_steps.html" %}
 
@@ -29,8 +34,6 @@
 
     <h5 class="mb-3">{% trans "Your event was created and can now be further configured." %}</h5>
 
-    {{ form.media }}
-
     <form method="post">{% csrf_token %}
         {% bootstrap_form form %}
 

AKModel/templates/admin/AKModel/event_wizard/import.html

@@ -8,11 +8,14 @@
 
 {% block title %}{% trans "New event wizard" %}: {{ wizard_step_text }}{% endblock %}
 
+{% block extrahead %}
+    {{ block.super }}
+    {{ form.media }}
+{% endblock %}
+
 {% block content %}
     {% include "admin/AKModel/event_wizard/wizard_steps.html" %}
 
-    {{ form.media }}
-
     <form method="post">{% csrf_token %}
         {% bootstrap_form form %}
 

AKModel/templates/admin/AKModel/event_wizard/settings.html

@@ -8,11 +8,14 @@
 
 {% block title %}{% trans "New event wizard" %}: {{ wizard_step_text }}{% endblock %}
 
+{% block extrahead %}
+    {{ block.super }}
+    {{ form.media }}
+{% endblock %}
+
 {% block content %}
     {% include "admin/AKModel/event_wizard/wizard_steps.html" %}
 
-    {{ form.media }}
-
     {% timezone timezone %}
 
     <form method="post">{% csrf_token %}

AKModel/templates/admin/AKModel/event_wizard/start.html

@@ -7,6 +7,11 @@
 
 {% block title %}{% trans "New event wizard" %}: {{ wizard_step_text }}{% endblock %}
 
+{% block extrahead %}
+    {{ block.super }}
+    {{ form.media }}
+{% endblock %}
+
 {% block content %}
     {% include "admin/AKModel/event_wizard/wizard_steps.html" %}
 

AKModel/templates/admin/AKModel/export/slides.tex

@@ -19,6 +19,10 @@
 
     \faUser~ {{ translations.who }}
 
+    {% if show_types %}
+        \faList~ {{ translations.types }}
+    {% endif %}
+
     \faClock~ {{ translations.duration }}
 
     \faScroll~{{ translations.reso }}
@@ -45,6 +49,10 @@
 
                 \faUser~ {{ ak.owners_list | latex_escape }}
 
+                {% if show_types %}
+                    \faList~ {{ak.types_list }}
+                {% endif %}
+
                 {% if not result_presentation_mode %}
                     \faClock~ {{ak.durations_list}}
                 {% endif %}