db: add uniqueness constraints

Enforce uniqueness constraints at the database level, on:
- Invites,
- Procedures,
- Individuals.

These are the one less likely to have duplicates. A follow-up
PR will contains similar migrations, but more likely to have
existing duplicates that need to be removed.

db/migrate/20210427120000_add_unique_index_to_invites.rb

@@ -0,0 +1,14 @@
+class AddUniqueIndexToInvites < ActiveRecord::Migration[6.1]
+  include Database::MigrationHelpers
+
+  disable_ddl_transaction!
+
+  def up
+    delete_duplicates :invites, [:email, :dossier_id]
+    add_concurrent_index :invites, [:email, :dossier_id], unique: true
+  end
+
+  def down
+    remove_index :invites, column: [:email, :dossier_id]
+  end
+end

db/migrate/20210427120001_add_unique_index_to_procedures.rb

@@ -0,0 +1,14 @@
+class AddUniqueIndexToProcedures < ActiveRecord::Migration[6.1]
+  include Database::MigrationHelpers
+
+  disable_ddl_transaction!
+
+  def up
+    delete_duplicates :procedures, [:path, :closed_at, :hidden_at, :unpublished_at]
+    add_concurrent_index :procedures, [:path, :closed_at, :hidden_at, :unpublished_at], name: 'procedure_path_uniqueness', unique: true
+  end
+
+  def down
+    remove_index :procedures, [:path, :closed_at, :hidden_at, :unpublished_at], name: 'procedure_path_uniqueness'
+  end
+end

db/migrate/20210427120002_add_unique_index_to_individuals.rb

@@ -0,0 +1,14 @@
+class AddUniqueIndexToIndividuals < ActiveRecord::Migration[6.1]
+  include Database::MigrationHelpers
+
+  disable_ddl_transaction!
+
+  def up
+    delete_duplicates :individuals, [:dossier_id]
+    add_concurrent_index :individuals, [:dossier_id], unique: true
+  end
+
+  def down
+    remove_index :individuals, [:dossier_id]
+  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.define(version: 2021_04_22_101149) do
+ActiveRecord::Schema.define(version: 2021_04_27_120002) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -446,7 +446,7 @@ ActiveRecord::Schema.define(version: 2021_04_22_101149) do
     t.datetime "created_at"
     t.datetime "updated_at"
     t.date "birthdate"
-    t.index ["dossier_id"], name: "index_individuals_on_dossier_id"
+    t.index ["dossier_id"], name: "index_individuals_on_dossier_id", unique: true
   end
 
   create_table "initiated_mails", id: :serial, force: :cascade do |t|
@@ -474,6 +474,7 @@ ActiveRecord::Schema.define(version: 2021_04_22_101149) do
     t.datetime "created_at"
     t.datetime "updated_at"
     t.text "message"
+    t.index ["email", "dossier_id"], name: "index_invites_on_email_and_dossier_id", unique: true
   end
 
   create_table "module_api_cartos", id: :serial, force: :cascade do |t|
@@ -559,6 +560,7 @@ ActiveRecord::Schema.define(version: 2021_04_22_101149) do
     t.index ["draft_revision_id"], name: "index_procedures_on_draft_revision_id"
     t.index ["hidden_at"], name: "index_procedures_on_hidden_at"
     t.index ["parent_procedure_id"], name: "index_procedures_on_parent_procedure_id"
+    t.index ["path", "closed_at", "hidden_at", "unpublished_at"], name: "procedure_path_uniqueness", unique: true
     t.index ["path", "closed_at", "hidden_at"], name: "index_procedures_on_path_and_closed_at_and_hidden_at", unique: true
     t.index ["published_revision_id"], name: "index_procedures_on_published_revision_id"
     t.index ["service_id"], name: "index_procedures_on_service_id"