Planet resources

* Added missing table that should store a planet's resources data
(income and upkeep for each type of resource).

* Modified resource definition functions and universe generator to
initialise planet resource records as well

* Heavy clean-up in resource definition function unit tests

legacyworlds-server-data/db-structure/parts/030-data/100-universe.sql

@@ -135,6 +135,52 @@ ALTER TABLE verse.planet_money
 		FOREIGN KEY (planet_id) REFERENCES verse.planets;
 
 
+
+/*
+ * Planet resource changes
+ * ------------------------
+ * 
+ * This table stores the results of planet resource updates. It will then be
+ * used to update the owning empires' resources.
+ * 
+ * This table applies to both basic and natural resources. 
+ */
+CREATE TABLE verse.planet_resources(
+
+	/* Identifier of the planet */
+	planet_id			INT NOT NULL ,
+
+	/* Identifier of the resource type */
+	resource_name_id	INT NOT NULL ,
+
+	/* Quantity of that resource which was somehow gained at the last game
+	 * update.
+	 */
+	pres_income			DOUBLE PRECISION NOT NULL
+							DEFAULT 0
+							CHECK( pres_income >= 0 ) ,
+
+	/* Quantity of that resource used by the planet's various buildings at the
+	 * last game update.
+	 */
+	pres_upkeep			DOUBLE PRECISION NOT NULL
+							DEFAULT 0
+							CHECK( pres_upkeep >= 0 ) ,
+
+	/* Primary key on (planet,type of resource) */
+	PRIMARY KEY( planet_id , resource_name_id )
+);
+
+CREATE INDEX idx_pres_resource
+	ON verse.planet_resources( resource_name_id );
+
+ALTER TABLE verse.planet_resources
+	ADD CONSTRAINT fk_pres_planet
+		FOREIGN KEY ( planet_id ) REFERENCES verse.planets ,
+	ADD CONSTRAINT fk_pres_resource
+		FOREIGN KEY ( resource_name_id ) REFERENCES defs.resources;
+
+
 --
 -- Buildings
 --