convert the compound indexes used for query optimization, improves al…

…l queries across the board by about 1s (#182)

trade-module/src/main/resources/db/trademodule/changelog/add_latest_market_datum_cover_indexes.xml

@@ -5,22 +5,17 @@
                    http://www.liquibase.org/xml/ns/dbchangelog/dbchangelog-3.8.xsd">
 
     <changeSet id="add_latest_market_datum_cover_indexes" author="daniel-j-mason">
-        <createIndex tableName="latest_market_datum" indexName="latest_market_datum_compound_buy_market_index">
-            <column name="station_id"/>
-            <column name="commodity_id"/>
-            <column name="timestamp"/>
-            <column name="buy_price"/>
-            <column name="stock"/>
-            <column name="mean_price"/>
-        </createIndex>
-        <createIndex tableName="latest_market_datum" indexName="latest_market_datum_compound_sell_market_index">
-            <column name="station_id"/>
-            <column name="commodity_id"/>
-            <column name="timestamp"/>
-            <column name="sell_price"/>
-            <column name="demand"/>
-            <column name="mean_price"/>
-        </createIndex>
+        <sql>
+            CREATE INDEX
+                latest_market_datum_compound_buy_market_index
+                ON latest_market_datum (station_id, timestamp) include (commodity_id, buy_price, stock, mean_price);
+        </sql>
+
+        <sql>
+            CREATE INDEX
+                latest_market_datum_compound_sell_market_index
+                ON latest_market_datum (station_id, timestamp) include (commodity_id, sell_price, demand, mean_price);
+        </sql>
     </changeSet>
 
 </databaseChangeLog>