diff --git a/db/migrate/20231018172518_include_type_in_relationship_unique_constraint.rb b/db/migrate/20231018172518_include_type_in_relationship_unique_constraint.rb
new file mode 100644
index 00000000..171fe00f
--- /dev/null
+++ b/db/migrate/20231018172518_include_type_in_relationship_unique_constraint.rb
@@ -0,0 +1,10 @@
+# frozen_string_literal: true
+
+class IncludeTypeInRelationshipUniqueConstraint < ActiveRecord::Migration[6.1]
+  def change
+    change_table :relationships do |t|
+      t.remove_index(%i[source_id target_id])
+      t.index(%i[source_id target_id type], unique: true)
+    end
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index c45fb69c..ea268655 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 2023_05_26_181715) do
+ActiveRecord::Schema.define(version: 2023_10_18_172518) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -159,7 +159,7 @@ ActiveRecord::Schema.define(version: 2023_05_26_181715) do
     t.datetime "created_at"
     t.datetime "updated_at"
     t.string "type", null: false
-    t.index ["source_id", "target_id"], name: "index_relationships_on_source_id_and_target_id", unique: true
+    t.index ["source_id", "target_id", "type"], name: "index_relationships_on_source_id_and_target_id_and_type", unique: true
     t.index ["source_id"], name: "index_relationships_on_source_id"
     t.index ["target_id"], name: "index_relationships_on_target_id"
     t.index ["type"], name: "index_relationships_on_type"