The database

sql/inv.sql

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+CREATE TABLE `item` (
+	`id` INT(11) NOT NULL AUTO_INCREMENT,
+	`name` LONGTEXT DEFAULT NULL,
+	PRIMARY KEY (`id`)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
+
+-- Reselling item price, not including production item price, service item price, and subscription item price
+CREATE TABLE `item_price` (
+	`id` INT(11) NOT NULL AUTO_INCREMENT,
+	`item` INT(11) NOT NULL,
+	`type` VARCHAR(4) NOT NULL, -- buy, sell
+	`currency` VARCHAR(3) NOT NULL,
+	`value` INT(11) NOT NULL,
+	`periods` DATETIME NOT NULL,
+	PRIMARY KEY (`id`),
+	KEY `item` (`item`),
+	CONSTRAINT `item_price_fk_item`
+		FOREIGN KEY (`item`)
+		REFERENCES `item`(`id`)
+		ON UPDATE CASCADE
+		ON DELETE CASCADE
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
+
+-- Not including assets inventory, get from buying/production, and shipping/expedition
+CREATE TABLE `inventory` (
+	`id` INT(11) NOT NULL AUTO_INCREMENT,
+	`item` INT(11) NOT NULL,
+	`flow` VARCHAR(20) NOT NULL, -- in, out, buy, sell, buy return, sell return
+	`when` DATETIME NOT NULL,
+	`qty` INT(11) NOT NULL,
+	`note` LONGTEXT DEFAULT NULL,
+	PRIMARY KEY (`id`),
+	KEY `item` (`item`),
+	CONSTRAINT `inventory_fk_item`
+		FOREIGN KEY (`item`)
+		REFERENCES `item`(`id`)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
+-- get from: buying/production