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/models/family/plaid_connectable.rb

@@ -0,0 +1,51 @@
+module Family::PlaidConnectable
+  extend ActiveSupport::Concern
+
+  included do
+    has_many :plaid_items, dependent: :destroy
+  end
+
+  def create_plaid_item!(public_token:, item_name:, region:)
+    provider = plaid_provider_for_region(region)
+
+    public_token_response = provider.exchange_public_token(public_token)
+
+    plaid_item = plaid_items.create!(
+      name: item_name,
+      plaid_id: public_token_response.item_id,
+      access_token: public_token_response.access_token,
+      plaid_region: region
+    )
+
+    plaid_item.sync_later
+
+    plaid_item
+  end
+
+  def get_link_token(webhooks_url:, redirect_url:, accountable_type: nil, region: :us, access_token: nil)
+    return nil unless plaid_us || plaid_eu
+
+    provider = plaid_provider_for_region(region)
+
+    provider.get_link_token(
+      user_id: self.id,
+      webhooks_url: webhooks_url,
+      redirect_url: redirect_url,
+      accountable_type: accountable_type,
+      access_token: access_token
+    ).link_token
+  end
+
+  private
+    def plaid_us
+      @plaid ||= Provider::Registry.get_provider(:plaid_us)
+    end
+
+    def plaid_eu
+      @plaid_eu ||= Provider::Registry.get_provider(:plaid_eu)
+    end
+
+    def plaid_provider_for_region(region)
+      region.to_sym == :eu ? plaid_eu : plaid_us
+    end
+end