sql: remove price information

schema.sql

@@ -78,35 +78,6 @@ CREATE TABLE IF NOT EXISTS stock (
 	FOREIGN KEY (distribution) REFERENCES distribution (id)
 );
 
--- price currency
-CREATE TABLE IF NOT EXISTS currency (
-	id INTEGER AUTO_INCREMENT PRIMARY KEY, -- index
-	name TEXT NOT NULL
-);
-
--- currency rate
-CREATE TABLE IF NOT EXISTS rate (
-	origin INTEGER NOT NULL, -- from
-	destination INTEGER NOT NULL, -- to
-	rate REAL NOT NULL, -- 1 from = rate to
-	date DATETIME NOT NULL, -- date of the rate
-	FOREIGN KEY (origin) REFERENCES currency (id),
-	FOREIGN KEY (destination) REFERENCES currency (id)
-);
-
--- part price at a distributor
-CREATE TABLE IF NOT EXISTS price (
-	id INTEGER AUTO_INCREMENT PRIMARY KEY, -- index
-	distribution INTEGER NOT NULL, -- the part
-	quantity INTEGER NOT NULL, -- the minimum number of part for this price
-	price REAL NOT NULL, -- the unit price
-	currency INTEGER NOT NULL,
-	date DATETIME NOT NULL,
-	FOREIGN KEY (distribution) REFERENCES distribution (id),
-	FOREIGN KEY (currency) REFERENCES currency (id)
-);
-
--- document types
 CREATE TABLE IF NOT EXISTS document (
 	id INTEGER AUTO_INCREMENT PRIMARY KEY, -- index
 	type TEXT -- document type