diff --git a/priv/repo/seeds/activities.exs b/priv/repo/seeds/activities.exs
index 02d139b36..8d4efec4a 100644
--- a/priv/repo/seeds/activities.exs
+++ b/priv/repo/seeds/activities.exs
@@ -7,8 +7,7 @@ defmodule Atomic.Repo.Seeds.Activities do
   alias Atomic.Activities
   alias Atomic.Activities.SessionDepartment
   alias Atomic.Activities.Session
-  alias Atomic.Organizations.Organization
-  alias Atomic.Activities.{Activity, Enrollment, Location}
+  alias Atomic.Activities.{Activity, Enrollment}
 
   def run do
     seed_activities()
@@ -17,13 +16,13 @@ defmodule Atomic.Repo.Seeds.Activities do
   end
 
   def seed_activities() do
-    location = %{
-      name: "Departamento de Informática da Universidade do Minho",
-      url: "https://web.di.uminho.pt"
-    }
-
     case Repo.all(Activity) do
       [] ->
+        location = %{
+          name: "Departamento de Informática da Universidade do Minho",
+          url: "https://web.di.uminho.pt"
+        }
+
         Activity.changeset(
           %Activity{},
           %{
@@ -191,11 +190,12 @@ defmodule Atomic.Repo.Seeds.Activities do
   end
 
   def seed_activities_departments() do
-    department = Repo.get_by(Department, name: "Merchandise and Partnerships")
-
     case Repo.all(SessionDepartment) do
       [] ->
-        for activity <- Repo.all(Activity) do
+        department = Repo.get_by(Department, name: "Merchandise and Partnerships")
+        activities = Repo.all(Activity)
+
+        for activity <- activities do
           %SessionDepartment{}
           |> SessionDepartment.changeset(%{
             activity_id: activity.id,
@@ -203,15 +203,19 @@ defmodule Atomic.Repo.Seeds.Activities do
           })
           |> Repo.insert!()
         end
+
+      _ ->
+        Mix.shell().error("Found session departments, aborting seeding session departments.")
     end
   end
 
   def seed_enrollments() do
-    sessions = Repo.all(Session)
-
     case Repo.all(Enrollment) do
       [] ->
-        for user <- Repo.all(User) do
+        users = Repo.all(User)
+        sessions = Repo.all(Session)
+
+        for user <- users do
           for _ <- 1..Enum.random(1..2) do
             Activities.create_enrollment(
               Enum.random(sessions).id,
@@ -219,6 +223,9 @@ defmodule Atomic.Repo.Seeds.Activities do
             )
           end
         end
+
+      _ ->
+        Mix.shell().error("Found enrollments, aborting seeding enrollments.")
     end
   end
 
@@ -226,8 +233,9 @@ defmodule Atomic.Repo.Seeds.Activities do
     case Repo.all(SessionDepartment) do
       [] ->
         department = Repo.get_by(Department, name: "CAOS")
+        sessions = Repo.all(Session)
 
-        for session <- Repo.all(Session) do
+        for session <- sessions do
           %SessionDepartment{}
           |> SessionDepartment.changeset(%{
             session_id: session.id,
@@ -235,6 +243,9 @@ defmodule Atomic.Repo.Seeds.Activities do
           })
           |> Repo.insert!()
         end
+
+      _ ->
+        Mix.shell().error("Found session departments, aborting seeding session departments.")
     end
   end
 end
diff --git a/priv/repo/seeds/memberships.exs b/priv/repo/seeds/memberships.exs
index 99ca8dd26..f5322649f 100644
--- a/priv/repo/seeds/memberships.exs
+++ b/priv/repo/seeds/memberships.exs
@@ -2,7 +2,6 @@ defmodule Atomic.Repo.Seeds.Memberships do
   alias Atomic.Organizations.Organization
   alias Atomic.Organizations.Membership
   alias Atomic.Accounts.User
-  alias Atomic.Organizations
   alias Atomic.Organizations.Board
   alias Atomic.Organizations.BoardDepartments
   alias Atomic.Organizations.UserOrganization
@@ -16,74 +15,107 @@ defmodule Atomic.Repo.Seeds.Memberships do
   end
 
   def seed_memberships() do
-    users = Repo.all(User)
-    organizations = Repo.all(Organization)
-
-    for user <- users do
-      for organization <- organizations do
-        prob = 50
-        random_number = :rand.uniform(100)
-
-        if random_number < prob do
-          %Membership{}
-          |> Membership.changeset(%{
-            "user_id" => user.id,
-            "organization_id" => organization.id,
-            "created_by_id" => Enum.random(users).id,
-            "role" => Enum.random([:follower, :member, :admin, :owner])
-          })
-          |> Repo.insert!()
+    case Repo.all(Membership) do
+      [] ->
+        users = Repo.all(User)
+        organizations = Repo.all(Organization)
+
+        for user <- users do
+          for organization <- organizations do
+            prob = 50
+            random_number = :rand.uniform(100)
+
+            if random_number < prob do
+              %Membership{}
+              |> Membership.changeset(%{
+                "user_id" => user.id,
+                "organization_id" => organization.id,
+                "created_by_id" => Enum.random(users).id,
+                "role" => Enum.random([:follower, :member, :admin, :owner])
+              })
+              |> Repo.insert!()
+            end
+          end
         end
-      end
+
+      _ ->
+        Mix.shell().error("Found memberships, aborting seeding memberships.")
     end
   end
 
   def seed_board do
-    organizations = Repo.all(Organization)
-
-    for organization <- organizations do
-      %Board{}
-      |> Board.changeset(%{
-        "organization_id" => organization.id,
-        "year" => "2023/2024"
-      })
-      |> Repo.insert!()
+    case Repo.all(Board) do
+      [] ->
+        organizations = Repo.all(Organization)
+
+        for organization <- organizations do
+          %Board{}
+          |> Board.changeset(%{
+            "organization_id" => organization.id,
+            "year" => "2023/2024"
+          })
+          |> Repo.insert!()
+        end
+
+      _ ->
+        Mix.shell().error("Found boards, aborting seeding boards.")
     end
   end
 
   def seed_board_departments do
-    departments = ["Conselho Fiscal", "Mesa AG", "CAOS", "DMC", "DMP", "Presidência", "Vogais"]
-    boards = Repo.all(Board)
-
-    for board <- boards do
-      for i <- 0..6 do
-        %BoardDepartments{}
-        |> BoardDepartments.changeset(%{
-          "board_id" => board.id,
-          "name" => Enum.at(departments, i),
-          "priority" => i
-        })
-        |> Repo.insert!()
-      end
+    case Repo.all(BoardDepartments) do
+      [] ->
+        departments = [
+          "Conselho Fiscal",
+          "Mesa AG",
+          "CAOS",
+          "DMC",
+          "DMP",
+          "Presidência",
+          "Vogais"
+        ]
+
+        boards = Repo.all(Board)
+
+        for board <- boards do
+          for i <- 0..6 do
+            %BoardDepartments{}
+            |> BoardDepartments.changeset(%{
+              "board_id" => board.id,
+              "name" => Enum.at(departments, i),
+              "priority" => i
+            })
+            |> Repo.insert!()
+          end
+        end
+
+      _ ->
+        Mix.shell().error("Found board departments, aborting seeding board departments.")
     end
   end
 
   def seed_user_organizations do
-    titles = ["Presidente", "Vice-Presidente", "Secretário", "Tesoureiro", "Vogal"]
-    board_departments = Repo.all(BoardDepartments)
-    users = Repo.all(User)
-
-    for board_department <- board_departments do
-      for i <- 0..4 do
-        %UserOrganization{}
-        |> UserOrganization.changeset(%{
-          "user_id" => Enum.random(users).id,
-          "board_departments_id" => board_department.id,
-          "role" => Enum.at(titles, i),
-          "priority" => i
-        })
-        |> Repo.insert!()
-      end
+    case Repo.all(UserOrganization) do
+      [] ->
+        titles = ["Presidente", "Vice-Presidente", "Secretário", "Tesoureiro", "Vogal"]
+        users = Repo.all(User)
+        board_departments = Repo.all(BoardDepartments)
+
+        for board_department <- board_departments do
+          for i <- 0..4 do
+            %UserOrganization{}
+            |> UserOrganization.changeset(%{
+              "user_id" => Enum.random(users).id,
+              "board_departments_id" => board_department.id,
+              "role" => Enum.at(titles, i),
+              "priority" => i
+            })
+            |> Repo.insert!()
+          end
+        end
+
+      _ ->
+        Mix.shell().error("Found user organizations, aborting seeding user organizations.")
     end
   end
 end
diff --git a/priv/repo/seeds/news.exs b/priv/repo/seeds/news.exs
index d3c698e75..fb7aea64d 100644
--- a/priv/repo/seeds/news.exs
+++ b/priv/repo/seeds/news.exs
@@ -8,18 +8,24 @@ defmodule Atomic.Repo.Seeds.News do
   end
 
   def seed_news() do
-    organizations = Repo.all(Organization)
+    case Repo.all(New) do
+      [] ->
+        organizations = Repo.all(Organization)
 
-    for organization <- organizations do
-      for i <- 1..10 do
-        %New{}
-        |> New.changeset(%{
-          title: "News title #{organization.name} #{i}",
-          description: "News description #{organization.name} #{i}",
-          organization_id: organization.id
-        })
-        |> Repo.insert!()
-      end
+        for organization <- organizations do
+          for i <- 1..10 do
+            %New{}
+            |> New.changeset(%{
+              title: "News title #{organization.name} #{i}",
+              description: "News description #{organization.name} #{i}",
+              organization_id: organization.id
+            })
+            |> Repo.insert!()
+          end
+        end
+
+      _ ->
+        Mix.shell().error("Found news, aborting seeding news.")
     end
   end
 end
diff --git a/priv/repo/seeds/organizations.exs b/priv/repo/seeds/organizations.exs
index 26441ab81..da50b6bb9 100644
--- a/priv/repo/seeds/organizations.exs
+++ b/priv/repo/seeds/organizations.exs
@@ -1,11 +1,7 @@
 defmodule Atomic.Repo.Seeds.Organizations do
   alias Atomic.Repo
 
-  alias Atomic.Accounts.User
-  alias Atomic.Organizations.Card
-  alias Atomic.Organizations.Membership
   alias Atomic.Organizations.Organization
-  alias Atomic.Organizations
 
   def run do
     seed_organizations()
@@ -104,7 +100,7 @@ defmodule Atomic.Repo.Seeds.Organizations do
         |> Repo.insert!()
 
       _ ->
-        :ok
+        Mix.shell().error("Found organizations, aborting seeding organizations.")
     end
   end
 end
diff --git a/priv/repo/seeds/partners.exs b/priv/repo/seeds/partners.exs
index 538617635..44348b869 100644
--- a/priv/repo/seeds/partners.exs
+++ b/priv/repo/seeds/partners.exs
@@ -8,18 +8,24 @@ defmodule Atomic.Repo.Seeds.Partners do
   end
 
   def seed_partners() do
-    organizations = Repo.all(Organization)
+    case Repo.all(Partner) do
+      [] ->
+        organizations = Repo.all(Organization)
 
-    for organization <- organizations do
-      for i <- 1..10 do
-        %Partner{}
-        |> Partner.changeset(%{
-          name: Faker.Company.name(),
-          description: Faker.Company.catch_phrase(),
-          organization_id: organization.id
-        })
-        |> Repo.insert!()
-      end
+        for organization <- organizations do
+          for _ <- 1..10 do
+            %Partner{}
+            |> Partner.changeset(%{
+              name: Faker.Company.name(),
+              description: Faker.Company.catch_phrase(),
+              organization_id: organization.id
+            })
+            |> Repo.insert!()
+          end
+        end
+
+      _ ->
+        Mix.shell().error("Found partners, aborting seeding partners.")
     end
   end
 end
diff --git a/test/support/factories/activities_factory.ex b/test/support/factories/activities_factory.ex
index 02901c129..7a8e6a9c6 100644
--- a/test/support/factories/activities_factory.ex
+++ b/test/support/factories/activities_factory.ex
@@ -25,8 +25,8 @@ defmodule Atomic.Factories.ActivityFactory do
 
       def session_factory do
         %Session{
-          minimum_entries: 5,
-          maximum_entries: 50,
+          minimum_entries: Enum.random(1..10),
+          maximum_entries: Enum.random(11..20),
           start: NaiveDateTime.utc_now(),
           finish: NaiveDateTime.utc_now() |> NaiveDateTime.add(1, :hour)
         }