diff --git a/galaxy/management/commands/generate_galaxy_test_data.py b/galaxy/management/commands/generate_galaxy_test_data.py
new file mode 100644
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+++ b/galaxy/management/commands/generate_galaxy_test_data.py
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+# -*- coding:utf-8 -*
+#
+# Copyright 2023
+# - Skia <skia@hya.sk>
+#
+# Ce fichier fait partie du site de l'Association des Étudiants de l'UTBM,
+# http://ae.utbm.fr.
+#
+# This program is free software; you can redistribute it and/or modify it under
+# the terms of the GNU General Public License a published by the Free Software
+# Foundation; either version 3 of the License, or (at your option) any later
+# version.
+#
+# This program is distributed in the hope that it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+# FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+# details.
+#
+# You should have received a copy of the GNU General Public License along with
+# this program; if not, write to the Free Sofware Foundation, Inc., 59 Temple
+# Place - Suite 330, Boston, MA 02111-1307, USA.
+#
+#
+
+from django.conf import settings
+from django.core.files.base import ContentFile
+from django.core.management.base import BaseCommand
+from django.utils import timezone
+
+from datetime import timedelta
+
+import logging
+
+from club.models import Club, Membership
+from core.models import User, Group, Page, SithFile
+from subscription.models import Subscription
+from sas.models import Album, Picture, PeoplePictureRelation
+
+
+RED_PIXEL_PNG = b"\x89\x50\x4e\x47\x0d\x0a\x1a\x0a\x00\x00\x00\x0d\x49\x48\x44\x52"
+RED_PIXEL_PNG += b"\x00\x00\x00\x01\x00\x00\x00\x01\x08\x02\x00\x00\x00\x90\x77\x53"
+RED_PIXEL_PNG += b"\xde\x00\x00\x00\x0c\x49\x44\x41\x54\x08\xd7\x63\xf8\xcf\xc0\x00"
+RED_PIXEL_PNG += b"\x00\x03\x01\x01\x00\x18\xdd\x8d\xb0\x00\x00\x00\x00\x49\x45\x4e"
+RED_PIXEL_PNG += b"\x44\xae\x42\x60\x82"
+
+USER_PACK_SIZE = 1000
+
+
+class Command(BaseCommand):
+    help = "Procedurally generate representative data for developing the Galaxy"
+
+    def add_arguments(self, parser):
+        parser.add_argument(
+            "--user-pack-count",
+            help=f"Number of packs of {USER_PACK_SIZE} users to create",
+            type=int,
+            default=1,
+        )
+        parser.add_argument(
+            "--club-count", help="Number of clubs to create", type=int, default=50
+        )
+
+    def handle(self, *args, **options):
+        self.logger = logging.getLogger("main")
+        if options["verbosity"] > 1:
+            self.logger.setLevel(logging.DEBUG)
+        elif options["verbosity"] > 0:
+            self.logger.setLevel(logging.INFO)
+        else:
+            self.logger.setLevel(logging.NOTSET)
+
+        self.logger.info("The Galaxy is being populated by the Sith.")
+
+        self.logger.info("Cleaning old Galaxy population")
+        Club.objects.filter(unix_name__startswith="galaxy-").delete()
+        Group.objects.filter(name__startswith="galaxy-").delete()
+        Page.objects.filter(name__startswith="galaxy-").delete()
+        User.objects.filter(username__startswith="galaxy-").delete()
+        Picture.objects.filter(name__startswith="galaxy-").delete()
+        Album.objects.filter(name__startswith="galaxy-").delete()
+        self.logger.info("Done. Populating a new Galaxy")
+
+        self.NB_USERS = options["user_pack_count"] * USER_PACK_SIZE
+        self.NB_CLUBS = options["club_count"]
+
+        self.now = timezone.now().replace(hour=12)
+        root = User.objects.filter(username="root").first()
+        sas = SithFile.objects.get(id=settings.SITH_SAS_ROOT_DIR_ID)
+        self.galaxy_album = Album.objects.create(
+            name="galaxy-register-file",
+            owner=root,
+            is_moderated=True,
+            is_in_sas=True,
+            parent=sas,
+        )
+
+        self.make_clubs()
+        self.make_users()
+        self.make_families()
+        self.make_club_memberships()
+        self.make_pictures()
+        self.make_pictures_memberships()
+        half_pack = USER_PACK_SIZE // 2
+        for u in range(half_pack, self.NB_USERS, half_pack):
+            self.make_important_citizen(u)
+
+    def make_clubs(self):
+        # This will create all the clubs and store them in self.clubs for fast access later
+        self.clubs = {}
+        for i in range(self.NB_CLUBS):
+            self.clubs[i] = Club.objects.create(
+                unix_name=f"galaxy-club-{i}", name=f"club-{i}"
+            )
+
+    def make_users(self):
+        # This will create all the users and store them in self.users for fast access later
+        self.users = {}
+        for i in range(self.NB_USERS):
+            u = User.objects.create_user(
+                username=f"galaxy-user-{i}",
+                email=f"{i}@galaxy.test",
+                first_name="Citizen",
+                last_name=f"n°{i}",
+            )
+            self.users[i] = u
+
+            self.logger.info(f"Registering {u}")
+            Subscription.objects.create(
+                member=u,
+                subscription_start=Subscription.compute_start(
+                    self.now - timedelta(days=self.NB_USERS - i)
+                ),
+                subscription_end=Subscription.compute_end(duration=2),
+            )
+
+    def make_families(self):
+        # This will iterate on all citizen after the 200th.
+        # Then it will take 14 other citizen among the 200 preceding (godfathers are usually older), and apply another heuristic to determine if they should have a family link
+        for i in range(200, self.NB_USERS):
+            for j in range(i - 200, i, 14):  # this will loop 14 times (14² = 196)
+                if (i / 10) % 10 == (i + j) % 10:
+                    u1 = self.users[i]
+                    u2 = self.users[j]
+                    self.logger.info(f"Making {u2} the godfather of {u1}")
+                    u1.godfathers.add(u2)
+
+    def make_club_memberships(self):
+        # This function makes multiple passes on all users to affect them some pseudo-random roles in some clubs.
+        # The multiple passes are useful to get some variations over who goes where.
+        # Each pass for each user has a chance to affect her to two different clubs, increasing a bit more the created chaos, while remaining purely deterministic.
+        for i in range(1, 11):  # users can be in up to 20 clubs
+            self.logger.info(f"Club membership, pass {i}")
+            for uid in range(
+                i, self.NB_USERS, i
+            ):  # Pass #1 will make sure every user is at least in one club
+                user = self.users[uid]
+                club = self.clubs[(uid + i**2) % self.NB_CLUBS]
+
+                start = self.now - timedelta(
+                    days=(((self.NB_USERS - uid) * i) // 110)
+                )  # older users were in clubs before newer users
+                end = start + timedelta(days=180)  # about one semester
+                self.logger.info(
+                    f"Making {user} a member of club {club} from {start} to {end}"
+                )
+                Membership(
+                    user=user,
+                    club=club,
+                    role=(uid + i) % 10 + 1,  # spread the different roles
+                    start_date=start,
+                    end_date=end,
+                ).save()
+
+            for uid in range(
+                10 + i * 2, self.NB_USERS, 10 + i * 2
+            ):  # Make a second affectation that will skip most users, to make a few citizen more important
+                user = self.users[uid]
+                club = self.clubs[(uid + i**3) % self.NB_CLUBS]
+
+                start = self.now - timedelta(
+                    days=(((self.NB_USERS - uid) * i) // 100)
+                )  # older users were in clubs before newer users
+                end = start + timedelta(days=180)  # about one semester
+                self.logger.info(
+                    f"Making {user} a member of club {club} from {start} to {end}"
+                )
+                Membership(
+                    user=user,
+                    club=club,
+                    role=((uid // 10) + i) % 10 + 1,  # spread the different roles
+                    start_date=start,
+                    end_date=end,
+                ).save()
+
+    def make_pictures(self):
+        # This function creates pictures for users to be tagged on later
+        self.picts = {}
+        for i in range(self.NB_USERS):
+            u = self.users[i]
+            # Create twice as many pictures as users
+            for j in [i, i**2]:
+                self.picts[j] = Picture.objects.create(
+                    owner=self.users[i],
+                    name=f"galaxy-picture {u} {j}",
+                    is_moderated=True,
+                    is_folder=False,
+                    parent=self.galaxy_album,
+                    is_in_sas=True,
+                    file=ContentFile(RED_PIXEL_PNG),
+                    compressed=ContentFile(RED_PIXEL_PNG),
+                    thumbnail=ContentFile(RED_PIXEL_PNG),
+                    mime_type="image/png",
+                    size=len(RED_PIXEL_PNG),
+                )
+                self.picts[j].file.name = self.picts[j].name
+                self.picts[j].compressed.name = self.picts[j].name
+                self.picts[j].thumbnail.name = self.picts[j].name
+                self.picts[j].save()
+
+    def make_pictures_memberships(self):
+        # We don't want to handle limits, users in the middle will be far enough
+        def _tag_neighbors(uid, neighbor_dist, pict_power, pict_dist):
+            u2 = self.users[uid - neighbor_dist]
+            u3 = self.users[uid + neighbor_dist]
+            PeoplePictureRelation(user=u2, picture=self.picts[uid**pict_power]).save()
+            PeoplePictureRelation(user=u3, picture=self.picts[uid**pict_power]).save()
+            PeoplePictureRelation(user=u2, picture=self.picts[uid - pict_dist]).save()
+            PeoplePictureRelation(user=u3, picture=self.picts[uid - pict_dist]).save()
+            PeoplePictureRelation(user=u2, picture=self.picts[uid + pict_dist]).save()
+            PeoplePictureRelation(user=u3, picture=self.picts[uid + pict_dist]).save()
+
+        for uid in range(200, self.NB_USERS - 200):
+            u1 = self.users[uid]
+            self.logger.info(f"Pictures of {u1}")
+            PeoplePictureRelation(user=u1, picture=self.picts[uid]).save()
+            PeoplePictureRelation(user=u1, picture=self.picts[uid - 14]).save()
+            PeoplePictureRelation(user=u1, picture=self.picts[uid + 14]).save()
+            PeoplePictureRelation(user=u1, picture=self.picts[uid - 20]).save()
+            PeoplePictureRelation(user=u1, picture=self.picts[uid + 20]).save()
+            PeoplePictureRelation(user=u1, picture=self.picts[uid - 21]).save()
+            PeoplePictureRelation(user=u1, picture=self.picts[uid + 21]).save()
+            PeoplePictureRelation(user=u1, picture=self.picts[uid - 22]).save()
+            PeoplePictureRelation(user=u1, picture=self.picts[uid + 22]).save()
+            PeoplePictureRelation(user=u1, picture=self.picts[uid - 30]).save()
+            PeoplePictureRelation(user=u1, picture=self.picts[uid + 30]).save()
+            PeoplePictureRelation(user=u1, picture=self.picts[uid - 31]).save()
+            PeoplePictureRelation(user=u1, picture=self.picts[uid + 31]).save()
+            PeoplePictureRelation(user=u1, picture=self.picts[uid - 32]).save()
+            PeoplePictureRelation(user=u1, picture=self.picts[uid + 32]).save()
+
+            if uid % 3 == 0:
+                _tag_neighbors(uid, 1, 1, 40)
+            if uid % 5 == 0:
+                _tag_neighbors(uid, 2, 1, 50)
+            if uid % 10 == 0:
+                _tag_neighbors(uid, 3, 1, 60)
+            if uid % 20 == 0:
+                _tag_neighbors(uid, 5, 1, 70)
+            if uid % 25 == 0:
+                _tag_neighbors(uid, 10, 1, 80)
+
+            if uid % 2 == 1:
+                _tag_neighbors(uid, 1, 2, 90)
+            if uid % 15 == 0:
+                _tag_neighbors(uid, 5, 2, 100)
+            if uid % 30 == 0:
+                _tag_neighbors(uid, 4, 2, 110)
+
+    def make_important_citizen(self, uid):
+        # These three people will be really close, since they already are in many clubs together!
+        u1 = self.users[uid]
+        u2 = self.users[uid - 100]
+        u3 = self.users[uid + 100]
+        u1.godfathers.add(u3)
+        u1.godchildren.add(u2)
+        self.logger.info(f"{u1} will be important and close to {u2} and {u3}")
+        for p in range(  # Mix them with other citizen for more chaos
+            uid - 400, uid - 200
+        ):
+            # users may already be on the pictures
+            if not self.picts[p].people.filter(user=u1).exists():
+                PeoplePictureRelation(user=u1, picture=self.picts[p]).save()
+            if not self.picts[p].people.filter(user=u2).exists():
+                PeoplePictureRelation(user=u2, picture=self.picts[p]).save()
+            if not self.picts[p**2].people.filter(user=u1).exists():
+                PeoplePictureRelation(user=u1, picture=self.picts[p**2]).save()
+            if not self.picts[p**2].people.filter(user=u2).exists():
+                PeoplePictureRelation(user=u2, picture=self.picts[p**2]).save()