Balance sheet cache layer, non-blocking sync UI (#2356)

* Balance sheet cache layer with cache-busting

* Update family cache timestamps during Sync

* Less blocking sync loaders

* Consolidate family data caching key logic

* Fix turbo stream broadcasts

* Remove dev delay

* Add back account group sorting

app/models/balance_sheet/net_worth_series_builder.rb

@@ -0,0 +1,38 @@
+class BalanceSheet::NetWorthSeriesBuilder
+  def initialize(family)
+    @family = family
+  end
+
+  def net_worth_series(period: Period.last_30_days)
+    Rails.cache.fetch(cache_key(period)) do
+      builder = Balance::ChartSeriesBuilder.new(
+        account_ids: active_account_ids,
+        currency: family.currency,
+        period: period,
+        favorable_direction: "up"
+      )
+
+      builder.balance_series
+    end
+  end
+
+  private
+    attr_reader :family
+
+    def active_account_ids
+      @active_account_ids ||= family.accounts.active.with_attached_logo.pluck(:id)
+    end
+
+    def cache_key(period)
+      key = [
+        "balance_sheet_net_worth_series",
+        period.start_date,
+        period.end_date
+      ].compact.join("_")
+
+      family.build_cache_key(
+        key,
+        invalidate_on_data_updates: true
+      )
+    end
+end