Add uniqueness constraints to course properties

db/migrate/20240204133705_add_uniqueness_to_course_properties.rb

@@ -0,0 +1,6 @@
+class AddUniquenessToCourseProperties < ActiveRecord::Migration[7.1]
+  def change
+    add_index :courses, :unit_code, unique: true
+    add_index :courses, :toggl_project, unique: true
+  end
+end

db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema[7.1].define(version: 2024_02_04_130739) do
+ActiveRecord::Schema[7.1].define(version: 2024_02_04_133705) do
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
 
@@ -24,6 +24,8 @@ ActiveRecord::Schema[7.1].define(version: 2024_02_04_130739) do
     t.date "semester_start_date", default: "2023-10-02"
     t.string "homepage"
     t.boolean "archived", default: false, null: false
+    t.index ["toggl_project"], name: "index_courses_on_toggl_project", unique: true
+    t.index ["unit_code"], name: "index_courses_on_unit_code", unique: true
   end
 
   create_table "lectures", force: :cascade do |t|