diff --git a/schema.sql b/schema.sql
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index 0000000..b69761a
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+++ b/schema.sql
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+-- enable foreign key support in sqlite
+--PRAGMA foreign_keys = ON;
+
+-- part manufacturer
+CREATE TABLE IF NOT EXISTS manufacturer (
+	id INTEGER AUTO_INCREMENT PRIMARY KEY, -- index
+	name TEXT NOT NULL UNIQUE, -- manufacturer (expanded version, without legal form)
+	nick TEXT, -- manufacturer nickname
+	partof INTEGER, -- if the manufacturer has been acquired or is part of another
+	homepage TEXT, -- URL to home page
+	search TEXT, -- URL to search page
+	FOREIGN KEY (partof) REFERENCES manufacturer (id)
+);
+
+-- part distributor
+CREATE TABLE IF NOT EXISTS distributor (
+	id INTEGER AUTO_INCREMENT PRIMARY KEY, -- index
+	name TEXT NOT NULL UNIQUE,
+	homepage TEXT, -- URL to home page
+	product_page TEXT -- URL to product page (%s is replace by sku)
+);
+
+-- part package
+CREATE TABLE IF NOT EXISTS package (
+	id INTEGER AUTO_INCREMENT PRIMARY KEY, -- index
+	name TEXT NOT NULL UNIQUE,
+	family TEXT -- if this package it part of a more general package family
+);
+
+-- the part itself
+CREATE TABLE IF NOT EXISTS part (
+	id INTEGER AUTO_INCREMENT PRIMARY KEY, -- index
+	name TEXT NOT NULL UNIQUE,
+	description TEXT,
+	manufacturer INTEGER,
+	family INTEGER, -- if this part is part of a part family
+	datasheet TEXT, -- URL to datasheet
+	package INTEGER,
+	pincount INTEGER,
+	page TEXT, -- URL to product page
+	FOREIGN KEY (manufacturer) REFERENCES manufacturer (id),
+	FOREIGN KEY (family) REFERENCES part (id),
+	FOREIGN KEY (package) REFERENCES package (id)
+);
+
+-- 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,
+	path TEXT NOT NULL,
+	option TEXT,
+	FOREIGN KEY (cad) REFERENCES cad (id)
+);
+
+-- a part at a distributor
+CREATE TABLE IF NOT EXISTS distribution (
+	id INTEGER AUTO_INCREMENT PRIMARY KEY, -- index
+	part INTEGER NOT NULL, -- the part
+	distributor INTEGER NOT NULL, -- the part distributor
+	sku TEXT NOT NULL, -- distributor part number
+	FOREIGN KEY (part) REFERENCES part (id),
+	FOREIGN KEY (distributor) REFERENCES distributor (id)
+);
+
+-- part stock at a distributor
+CREATE TABLE IF NOT EXISTS stock (
+	id INTEGER AUTO_INCREMENT PRIMARY KEY, -- index
+	distribution INTEGER NOT NULL, -- the part
+	stock INTEGER NOT NULL,
+	date DATETIME NOT NULL,
+	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
+);
+
+-- part attachments
+CREATE TABLE IF NOT EXISTS attachement (
+	id INTEGER AUTO_INCREMENT PRIMARY KEY, -- index
+	part INTEGER NOT NULL, -- the part
+	type INTEGER, -- attachment document type
+	path TEXT NOT NULL, -- the path to the attachment
+	priority INTEGER NOT NULL, -- in which place the attachment should be displayed
+	FOREIGN KEY (part) REFERENCES part (id),
+	FOREIGN KEY (type) REFERENCES document (id),
+	UNIQUE (part, priority)
+);
+
+-- property unit
+CREATE TABLE IF NOT EXISTS unit (
+	id INTEGER AUTO_INCREMENT PRIMARY KEY, -- index
+	name TEXT NOT NULL UNIQUE,
+	symbol TEXT NOT NULL UNIQUE
+);
+
+-- part property
+CREATE TABLE IF NOT EXISTS property (
+	id INTEGER AUTO_INCREMENT PRIMARY KEY, -- index
+	name TEXT NOT NULL, -- property name (min V, ...)
+	unit INTEGER,
+	FOREIGN KEY (unit) REFERENCES unit (id)
+);
+
+-- property value
+CREATE TABLE IF NOT EXISTS poperty_value (
+	id INTEGER AUTO_INCREMENT PRIMARY KEY, -- index
+	part INTEGER NOT NULL, -- the part
+	property INTEGER NOT NULL,
+	value TEXT,
+	FOREIGN KEY (part) REFERENCES part (id),
+	FOREIGN KEY (property) REFERENCES property (id)
+);
+
+-- part location
+CREATE TABLE IF NOT EXISTS location (
+	id INTEGER AUTO_INCREMENT PRIMARY KEY, -- index
+	name TEXT NOT NULL UNIQUE,
+	container TEXT -- container type
+);
+
+-- local stock
+CREATE TABLE IF NOT EXISTS inventory (
+	id INTEGER AUTO_INCREMENT PRIMARY KEY, -- index
+	part INTEGER NOT NULL,
+	location INTEGER,
+	quantity INTEGER NOT NULL,
+	date DATETIME NOT NULL, -- when the quantity changed
+	FOREIGN KEY (part) REFERENCES part (id),
+	FOREIGN KEY (location) REFERENCES location (id)
+);