Basic Plaid Integration (#1433)

* Basic plaid data model and linking

* Remove institutions, add plaid items

* Improve schema and Plaid provider

* Add webhook verification sketch

* Webhook verification

* Item accounts and balances sync setup

* Provide test encryption keys

* Fix test

* Only provide encryption keys in prod

* Try defining keys in test env

* Consolidate account sync logic

* Add back plaid account initialization

* Plaid transaction sync

* Sync UI overhaul for Plaid

* Add liability and investment syncing

* Handle investment webhooks and process current day holdings

* Remove logs

* Remove "all" period select for performance

* fix amount calc

* Remove todo comment

* Coming soon for investment historical data

* Document Plaid configuration

* Listen for holding updates

test/models/plaid_item_test.rb

@@ -0,0 +1,21 @@
+require "test_helper"
+
+class PlaidItemTest < ActiveSupport::TestCase
+  include SyncableInterfaceTest
+
+  setup do
+    @plaid_item = @syncable = plaid_items(:one)
+  end
+
+  test "removes plaid item when destroyed" do
+    @plaid_provider = mock
+
+    PlaidItem.stubs(:plaid_provider).returns(@plaid_provider)
+
+    @plaid_provider.expects(:remove_item).with(@plaid_item.access_token).once
+
+    assert_difference "PlaidItem.count", -1 do
+      @plaid_item.destroy
+    end
+  end
+end