Enhance table junctions and coordinates

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);