add materialized view to keep individual contract existences

server/tables.sql

@@ -23,6 +23,21 @@ CREATE TABLE option_contract_existences
 ENGINE ReplacingMergeTree()
 PRIMARY KEY (asOfDate, symbol)
 ORDER BY (asOfDate, symbol, expirationDate, strike, type);
+CREATE MATERIALIZED VIEW option_contract_existences_mv TO option_contract_existences
+AS
+SELECT 
+  toDate(tsStart) as asOfDate,
+  symbol,
+  expirationDate,
+  strike,
+  type
+FROM option_contract_aggregates
+GROUP BY 
+  asOfDate,
+  symbol,
+  expirationDate,
+  strike,
+  type;
 
 CREATE TABLE option_contracts
 (