151 increase trade query performance (#152)

* add index for latest market datum buy_price, sell_price, stock, demand.
     pricing may not need indexing for trade algo but will improve commodity look up and commodity market view

 Add index for station arrival distance

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

@@ -0,0 +1,25 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<databaseChangeLog xmlns="http://www.liquibase.org/xml/ns/dbchangelog"
+                   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+                   xsi:schemaLocation="http://www.liquibase.org/xml/ns/dbchangelog
+                   http://www.liquibase.org/xml/ns/dbchangelog/dbchangelog-3.8.xsd">
+
+    <changeSet id="add_latest_market_datum_demand_supply_price_indexes" author="daniel-j-mason">
+        <createIndex indexName="idx_latest_market_datum_buy_price" tableName="latest_market_datum">
+            <column name="buy_price" />
+        </createIndex>
+
+        <createIndex indexName="idx_latest_market_datum_sell_price" tableName="latest_market_datum">
+            <column name="sell_price" />
+        </createIndex>
+
+        <createIndex indexName="idx_latest_market_datum_demand" tableName="latest_market_datum">
+            <column name="demand" />
+        </createIndex>
+
+        <createIndex indexName="idx_latest_market_datum_stock" tableName="latest_market_datum">
+            <column name="stock" />
+        </createIndex>
+    </changeSet>
+
+</databaseChangeLog>

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

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<databaseChangeLog xmlns="http://www.liquibase.org/xml/ns/dbchangelog"
+                   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+                   xsi:schemaLocation="http://www.liquibase.org/xml/ns/dbchangelog
+                   http://www.liquibase.org/xml/ns/dbchangelog/dbchangelog-3.8.xsd">
+
+    <changeSet id="add_station_arrival_distance_index" author="daniel-j-mason">
+        <createIndex indexName="idx_station_arrival_distance" tableName="station">
+            <column name="arrival_distance" />
+        </createIndex>
+    </changeSet>
+
+</databaseChangeLog>

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

@@ -32,6 +32,8 @@
     <include file="/db/trademodule/changelog/create_latest_market_datum_table.xml"/>
     <include file="/db/trademodule/changelog/fill_latest_market_datum.xml"/>
     <include file="/db/trademodule/changelog/add_unique_index_commodity_name.xml"/>
+    <include file="/db/trademodule/changelog/add_latest_market_datum_demand_supply_price_indexes.xml"/>
+    <include file="/db/trademodule/changelog/add_station_arrival_distance_index.xml"/>
 
     <!-- views always last as they might depend on new columns -->
     <include file="/db/trademodule/changelog/create_validated_commodity_view.xml"/>