Enhance table junctions and coordinates

script/sql/create/2.junctions.sql

@@ -3,7 +3,7 @@
 CREATE TABLE JUNCTIONS
 (
   ID VARCHAR(32) PRIMARY KEY REFERENCES _NODE(ID)
-, Elevation NUMERIC NOT NULL DEFAULT(0.0)
+, Elevation NUMERIC NOT NULL
 , Demand NUMERIC
 , Pattern VARCHAR(32) REFERENCES _PATTERN(ID)
 );

script/sql/create/24.coordinates.sql

@@ -3,7 +3,7 @@
 CREATE TABLE COORDINATES
 (
   Node VARCHAR(32) PRIMARY KEY REFERENCES _NODE(ID)
-, Coord POINT NOT NULL DEFAULT(POINT(0.0, 0.0))
+, Coord POINT NOT NULL
 );
 
 CREATE INDEX COORDINATES_SPGIST ON COORDINATES USING SPGIST(Coord);