sql: remove cad drawing table (use propert instead)

schema.sql

@@ -55,24 +55,6 @@ CREATE TABLE IF NOT EXISTS assembly (
 	UNIQUE (assembled, component)
 );
 
--- CAD drawing type
-CREATE TABLE IF NOT EXISTS cad (
-	id INTEGER AUTO_INCREMENT PRIMARY KEY, -- index
-	name TEXT NOT NULL UNIQUE,
-	extension TEXT
-);
-
--- part drawing (symbol, footprint, ...)
-CREATE TABLE IF NOT EXISTS drawing (
-	id INTEGER AUTO_INCREMENT PRIMARY KEY, -- index
-	cad INTEGER NOT NULL,
-	part INTEGER NOT NULL,
-	path TEXT NOT NULL,
-	option TEXT,
-	FOREIGN KEY (cad) REFERENCES cad (id),
-	FOREIGN KEY (part) REFERENCES part (id)
-);
-
 -- a part at a distributor
 CREATE TABLE IF NOT EXISTS distribution (
 	id INTEGER AUTO_INCREMENT PRIMARY KEY, -- index