Create CSV Issue Imports table

We need to keep a record of issue imports that a user has performed so
that we can report on the usage of this feature. Currently, we have no
persisted record of this action in the database so we cannot
retrospectively see how often this has occurred.

Create the CsvIssueImport model which can store a reference to the user
that performed the action, and which project the issues were imported
into.

MR: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/44742
Issue: https://gitlab.com/gitlab-org/gitlab/-/issues/235732

app/models/csv_issue_import.rb

+# frozen_string_literal: true
+
+class CsvIssueImport < ApplicationRecord
+  belongs_to :project, optional: false
+  belongs_to :user, optional: false
+end

db/migrate/20201008125643_create_csv_issue_imports.rb

+# frozen_string_literal: true
+
+class CreateCsvIssueImports < ActiveRecord::Migration[6.0]
+  DOWNTIME = false
+
+  def up
+    create_table :csv_issue_imports do |t|
+      t.bigint :project_id, null: false, index: true
+      t.bigint :user_id, null: false, index: true
+
+      t.timestamps_with_timezone
+    end
+  end
+
+  def down
+    drop_table :csv_issue_imports
+  end
+end

db/migrate/20201015121805_add_project_foreign_key_to_csv_issue_imports.rb

+# frozen_string_literal: true
+
+class AddProjectForeignKeyToCsvIssueImports < ActiveRecord::Migration[6.0]
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  disable_ddl_transaction!
+
+  def up
+    add_concurrent_foreign_key :csv_issue_imports, :projects, column: :project_id
+  end
+
+  def down
+    with_lock_retries do
+      remove_foreign_key :csv_issue_imports, column: :project_id
+    end
+  end
+end

db/migrate/20201015121825_add_user_foreign_key_to_csv_issue_imports.rb

+# frozen_string_literal: true
+
+class AddUserForeignKeyToCsvIssueImports < ActiveRecord::Migration[6.0]
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  disable_ddl_transaction!
+
+  def up
+    add_concurrent_foreign_key :csv_issue_imports, :users, column: :user_id
+  end
+
+  def down
+    with_lock_retries do
+      remove_foreign_key :csv_issue_imports, column: :user_id
+    end
+  end
+end

db/schema_migrations/20201008125643

+b7b15717435e06ea386c941c5a021b73f986ad3f41f2bd6f890738a79b710207
\ No newline at end of file

db/schema_migrations/20201015121805

+b8d5890fe5569127e794eea831fc18f8e5708b326e8037963fe2f6ae7f120e27
\ No newline at end of file

db/schema_migrations/20201015121825

+76e5a5bb535019da28041d1c7dddd8a18d3b04f688b38edc0c4214d3a4d6e357
\ No newline at end of file

db/structure.sql

@@ -11203,6 +11203,23 @@ CREATE SEQUENCE conversational_development_index_metrics_id_seq
 
 ALTER SEQUENCE conversational_development_index_metrics_id_seq OWNED BY conversational_development_index_metrics.id;
 
+CREATE TABLE csv_issue_imports (
+    id bigint NOT NULL,
+    project_id bigint NOT NULL,
+    user_id bigint NOT NULL,
+    created_at timestamp with time zone NOT NULL,
+    updated_at timestamp with time zone NOT NULL
+);
+
+CREATE SEQUENCE csv_issue_imports_id_seq
+    START WITH 1
+    INCREMENT BY 1
+    NO MINVALUE
+    NO MAXVALUE
+    CACHE 1;
+
+ALTER SEQUENCE csv_issue_imports_id_seq OWNED BY csv_issue_imports.id;
+
 CREATE TABLE custom_emoji (
     id bigint NOT NULL,
     namespace_id bigint NOT NULL,
@@ -17430,6 +17447,8 @@ ALTER TABLE ONLY container_repositories ALTER COLUMN id SET DEFAULT nextval('con
 
 ALTER TABLE ONLY conversational_development_index_metrics ALTER COLUMN id SET DEFAULT nextval('conversational_development_index_metrics_id_seq'::regclass);
 
+ALTER TABLE ONLY csv_issue_imports ALTER COLUMN id SET DEFAULT nextval('csv_issue_imports_id_seq'::regclass);
+
 ALTER TABLE ONLY custom_emoji ALTER COLUMN id SET DEFAULT nextval('custom_emoji_id_seq'::regclass);
 
 ALTER TABLE ONLY dast_scanner_profiles ALTER COLUMN id SET DEFAULT nextval('dast_scanner_profiles_id_seq'::regclass);
@@ -18478,6 +18497,9 @@ ALTER TABLE ONLY container_repositories
 ALTER TABLE ONLY conversational_development_index_metrics
     ADD CONSTRAINT conversational_development_index_metrics_pkey PRIMARY KEY (id);
 
+ALTER TABLE ONLY csv_issue_imports
+    ADD CONSTRAINT csv_issue_imports_pkey PRIMARY KEY (id);
+
 ALTER TABLE ONLY custom_emoji
     ADD CONSTRAINT custom_emoji_pkey PRIMARY KEY (id);
 
@@ -20101,6 +20123,10 @@ CREATE INDEX index_container_repository_on_name_trigram ON container_repositorie
 
 CREATE INDEX index_created_at_on_codeowner_approval_merge_request_rules ON approval_merge_request_rules USING btree (created_at) WHERE ((rule_type = 2) AND (section <> 'codeowners'::text));
 
+CREATE INDEX index_csv_issue_imports_on_project_id ON csv_issue_imports USING btree (project_id);
+
+CREATE INDEX index_csv_issue_imports_on_user_id ON csv_issue_imports USING btree (user_id);
+
 CREATE UNIQUE INDEX index_custom_emoji_on_namespace_id_and_name ON custom_emoji USING btree (namespace_id, name);
 
 CREATE UNIQUE INDEX index_daily_build_group_report_results_unique_columns ON ci_daily_build_group_report_results USING btree (project_id, ref_path, date, group_name);
@@ -22295,6 +22321,9 @@ ALTER TABLE ONLY deploy_keys_projects
 ALTER TABLE ONLY issue_assignees
     ADD CONSTRAINT fk_5e0c8d9154 FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE;
 
+ALTER TABLE ONLY csv_issue_imports
+    ADD CONSTRAINT fk_5e1572387c FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE;
+
 ALTER TABLE ONLY project_access_tokens
     ADD CONSTRAINT fk_5f7e8450e1 FOREIGN KEY (personal_access_token_id) REFERENCES personal_access_tokens(id) ON DELETE CASCADE;
 
@@ -22655,6 +22684,9 @@ ALTER TABLE ONLY merge_requests
 ALTER TABLE ONLY issue_links
     ADD CONSTRAINT fk_e71bb44f1f FOREIGN KEY (target_id) REFERENCES issues(id) ON DELETE CASCADE;
 
+ALTER TABLE ONLY csv_issue_imports
+    ADD CONSTRAINT fk_e71c0ae362 FOREIGN KEY (project_id) REFERENCES projects(id) ON DELETE CASCADE;
+
 ALTER TABLE ONLY namespaces
     ADD CONSTRAINT fk_e7a0b20a6b FOREIGN KEY (custom_project_templates_group_id) REFERENCES namespaces(id) ON DELETE SET NULL;
 

spec/models/csv_issue_import_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe CsvIssueImport, type: :model do
+  describe 'associations' do
+    it { is_expected.to belong_to(:project).required }
+    it { is_expected.to belong_to(:user).required }
+  end
+end