Improve account sync performance, handle concurrent market data syncing (#2236)

* PlaidConnectable concern

* Remove bad abstraction

* Put sync implementations in own concerns

* Sync strategies

* Move sync orchestration to Sync class

* Clean up sync class, add state machine

* Basic market data sync cron

* Fix price sync

* Improve sync window column names, add timestamps

* 30 day syncs by default

* Clean up market data methods

* Report high duplicate sync counts to Sentry

* Add sync states throughout app

* account tab session

* Persistent account tab selections

* Remove manual sleep

* Add migration to clear stale syncs on self hosted apps

* Tweak sync states

* Sync completion event broadcasts

* Fix timezones in tests

* Cleanup

* More cleanup

* Plaid item UI broadcasts for sync

* Fix account ID namespace conflict

* Sync broadcasters

* Smoother account sync refreshes

* Remove test sync delay

app/controllers/current_sessions_controller.rb

@@ -0,0 +1,14 @@
+class CurrentSessionsController < ApplicationController
+  def update
+    if session_params[:tab_key].present? && session_params[:tab_value].present?
+      Current.session.set_preferred_tab(session_params[:tab_key], session_params[:tab_value])
+    end
+
+    head :ok
+  end
+
+  private
+    def session_params
+      params.require(:current_session).permit(:tab_key, :tab_value)
+    end
+end