Add security prices provider (Synth integration) (#1039)

* User tickers as primary lookup symbol instead of isin

* Add security price provider

* Fetch security prices in bulk to improve sync performance

* Fetch prices in bulk, better mocking for tests

app/models/security/price.rb

@@ -1,2 +1,34 @@
 class Security::Price < ApplicationRecord
+  include Provided
+
+  before_save :upcase_ticker
+
+  validates :ticker, presence: true, uniqueness: { scope: :date, case_sensitive: false }
+
+  class << self
+    def find_price(ticker:, date:, cache: true)
+      result = find_by(ticker:, date:)
+
+      result || fetch_price_from_provider(ticker:, date:, cache:)
+    end
+
+    def find_prices(ticker:, start_date:, end_date: Date.current, cache: true)
+      prices = where(ticker:, date: start_date..end_date).to_a
+      all_dates = (start_date..end_date).to_a.to_set
+      existing_dates = prices.map(&:date).to_set
+      missing_dates = (all_dates - existing_dates).sort
+
+      if missing_dates.any?
+        prices += fetch_prices_from_provider(ticker:, start_date: missing_dates.first, end_date: missing_dates.last, cache:)
+      end
+
+      prices
+    end
+  end
+
+  private
+
+    def upcase_ticker
+      self.ticker = ticker.upcase
+    end
 end