added unique index to build id

app/models/build_configuration.rb

@@ -3,6 +3,7 @@
 # Table name: build_configurations
 #
 #  id               :bigint           not null, primary key
+#  build_type       :integer          default(0), not null
 #  driver           :integer          not null
 #  image_repository :string           not null
 #  created_at       :datetime         not null

app/models/deployment.rb

@@ -10,7 +10,7 @@
 #
 # Indexes
 #
-#  index_deployments_on_build_id  (build_id)
+#  index_deployments_on_build_id  (build_id) UNIQUE
 #
 # Foreign Keys
 #

db/migrate/20250904022903_add_unique_index_to_build_id.rb

@@ -0,0 +1,6 @@
+class AddUniqueIndexToBuildId < ActiveRecord::Migration[7.2]
+  def change
+    remove_index :deployments, :build_id
+    add_index :deployments, :build_id, 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[7.2].define(version: 2025_09_02_182502) do
+ActiveRecord::Schema[7.2].define(version: 2025_09_04_022903) do
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
 
@@ -150,7 +150,7 @@ ActiveRecord::Schema[7.2].define(version: 2025_09_02_182502) do
     t.integer "status", default: 0, null: false
     t.datetime "created_at", null: false
     t.datetime "updated_at", null: false
-    t.index ["build_id"], name: "index_deployments_on_build_id"
+    t.index ["build_id"], name: "index_deployments_on_build_id", unique: true
   end
 
   create_table "domains", force: :cascade do |t|

spec/factories/build_configurations.rb

@@ -3,6 +3,7 @@
 # Table name: build_configurations
 #
 #  id               :bigint           not null, primary key
+#  build_type       :integer          default(0), not null
 #  driver           :integer          not null
 #  image_repository :string           not null
 #  created_at       :datetime         not null

spec/factories/deployments.rb

@@ -10,7 +10,7 @@
 #
 # Indexes
 #
-#  index_deployments_on_build_id  (build_id)
+#  index_deployments_on_build_id  (build_id) UNIQUE
 #
 # Foreign Keys
 #

spec/models/build_configuration_spec.rb

@@ -3,6 +3,7 @@
 # Table name: build_configurations
 #
 #  id               :bigint           not null, primary key
+#  build_type       :integer          default(0), not null
 #  driver           :integer          not null
 #  image_repository :string           not null
 #  created_at       :datetime         not null