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diff --git a/lib/pleroma/user_relationship.ex b/lib/pleroma/user_relationship.ex
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+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.UserRelationship do
+  use Ecto.Schema
+
+  import Ecto.Changeset
+  import Ecto.Query
+
+  alias Pleroma.Repo
+  alias Pleroma.User
+  alias Pleroma.UserRelationship
+
+  schema "user_relationships" do
+    belongs_to(:source, User, type: FlakeId.Ecto.CompatType)
+    belongs_to(:target, User, type: FlakeId.Ecto.CompatType)
+    field(:relationship_type, UserRelationshipTypeEnum)
+
+    timestamps(updated_at: false)
+  end
+
+  def changeset(%UserRelationship{} = user_relationship, params \\ %{}) do
+    user_relationship
+    |> cast(params, [:relationship_type, :source_id, :target_id])
+    |> validate_required([:relationship_type, :source_id, :target_id])
+    |> unique_constraint(:relationship_type,
+      name: :user_relationships_source_id_relationship_type_target_id_index
+    )
+    |> validate_not_self_relationship()
+  end
+
+  def exists?(relationship_type, %User{} = source, %User{} = target) do
+    UserRelationship
+    |> where(relationship_type: ^relationship_type, source_id: ^source.id, target_id: ^target.id)
+    |> Repo.exists?()
+  end
+
+  def block_exists?(%User{} = blocker, %User{} = blockee), do: exists?(:block, blocker, blockee)
+
+  def mute_exists?(%User{} = muter, %User{} = mutee), do: exists?(:mute, muter, mutee)
+
+  def create(relationship_type, %User{} = source, %User{} = target) do
+    %UserRelationship{}
+    |> changeset(%{
+      relationship_type: relationship_type,
+      source_id: source.id,
+      target_id: target.id
+    })
+    |> Repo.insert(
+      on_conflict: :replace_all_except_primary_key,
+      conflict_target: [:source_id, :relationship_type, :target_id]
+    )
+  end
+
+  def create_block(%User{} = blocker, %User{} = blockee), do: create(:block, blocker, blockee)
+
+  def create_mute(%User{} = muter, %User{} = mutee), do: create(:mute, muter, mutee)
+
+  def delete(relationship_type, %User{} = source, %User{} = target) do
+    attrs = %{relationship_type: relationship_type, source_id: source.id, target_id: target.id}
+
+    case Repo.get_by(UserRelationship, attrs) do
+      %UserRelationship{} = existing_record -> Repo.delete(existing_record)
+      nil -> {:ok, nil}
+    end
+  end
+
+  def delete_block(%User{} = blocker, %User{} = blockee), do: delete(:block, blocker, blockee)
+
+  def delete_mute(%User{} = muter, %User{} = mutee), do: delete(:mute, muter, mutee)
+
+  defp validate_not_self_relationship(%Ecto.Changeset{} = changeset) do
+    changeset
+    |> validate_change(:target_id, fn _, target_id ->
+      if target_id == get_field(changeset, :source_id) do
+        [target_id: "can't be equal to source_id"]
+      else
+        []
+      end
+    end)
+    |> validate_change(:source_id, fn _, source_id ->
+      if source_id == get_field(changeset, :target_id) do
+        [source_id: "can't be equal to target_id"]
+      else
+        []
+      end
+    end)
+  end
+end