some ideas about database structure, began assets fetching request

database/migrations/m0.sql

@@ -33,7 +33,7 @@ CREATE TABLE IF NOT EXISTS roleBindings (
 
 --creating sessings table
 CREATE TABLE IF NOT EXISTS sessions (
-    `id` INTEGER AUTO_INCREMENT PRIMARY KEY,
+    `id` INTEGER UNSIGNED AUTO_INCREMENT PRIMARY KEY,
     `owner` INTEGER UNSIGNED NOT NULL,
     `started` TIMESTAMP DEFAULT UTC_TIMESTAMP(),
     `latest` TIMESTAMP DEFAULT UTC_TIMESTAMP(),
@@ -45,13 +45,90 @@ CREATE TABLE IF NOT EXISTS sessions (
     FOREIGN KEY (owner) REFERENCES accounts(id)
 );
 
+--creating currencies table
+CREATE TABLE IF NOT EXISTS currencies (
+    `id` INTEGER UNSIGNED AUTO_INCREMENT PRIMARY KEY,
+    `code` VARCHAR(16) NOT NULL UNIQUE,
+    `title` VARCHAR(256),
+    `manual` BOOLEAN NOT NULL,
+    `added` TIMESTAMP DEFAULT UTC_TIMESTAMP(),
+    `type` INTEGER UNSIGNED NOT NULL,
+    `value` DECIMAL (20, 5) NOT NULL,
+    `source` TEXT,
+    `description` TEXT,
+
+    INDEX manual_idx (manual)
+);
+
+--creating assests table
+CREATE TABLE IF NOT EXISTS assets (
+    `id` INTEGER UNSIGNED AUTO_INCREMENT PRIMARY KEY,
+    `owner` INTEGER UNSIGNED NOT NULL,
+    `currency` INTEGER UNSIGNED NOT NULL,
+    `title` VARCHAR(256),
+    `icon` VARCHAR(256),
+    `color` INTEGER UNSIGNED DEFAULT 0,
+    `balance` DECIMAL (20, 5) DEFAULT 0,
+    `type` INTEGER UNSIGNED NOT NULL,
+    `archived` BOOLEAN DEFAULT FALSE,
+
+    INDEX owner_idx (owner),
+    INDEX archived_idx (archived),
+
+    FOREIGN KEY (owner) REFERENCES accounts(id),
+    FOREIGN KEY (currency) REFERENCES currencies(id)
+);
+
+--creating parties table
+CREATE TABLE IF NOT EXISTS parties (
+    `id` INTEGER UNSIGNED AUTO_INCREMENT PRIMARY KEY,
+    `title` VARCHAR(256) NOT NULL UNIQUE
+);
+
+--creating transactions table
+CREATE TABLE IF NOT EXISTS transactions (
+    `id` INTEGER UNSIGNED AUTO_INCREMENT PRIMARY KEY,
+    `initiator` INTEGER UNSIGNED NOT NULL,
+    `type` INTEGER UNSIGNED NOT NULL,
+    `asset` INTEGER UNSIGNED NOT NULL,
+    `parent` INTEGER UNSIGNED,
+    `value` DECIMAL (20, 5) NOT NULL,
+    `state` INTEGER UNSIGNED DEFAULT 0,
+    `modified` TIMESTAMP DEFAULT UTC_TIMESTAMP(),
+    `performed` TIMESTAMP DEFAULT UTC_TIMESTAMP(),
+    `party` INTEGER UNSIGNED,
+    `notes` TEXT,
+
+    INDEX initiator_idx (initiator),
+    INDEX parent_idx (parent),
+    INDEX asset_idx (asset),
+    INDEX performed_idx (performed),
+    INDEX modified_idx (modified),
+    INDEX party_idx (party),
+
+    FOREIGN KEY (initiator) REFERENCES accounts(id),
+    FOREIGN KEY (asset) REFERENCES assets(id),
+    FOREIGN KEY (parent) REFERENCES transactions(id),
+    FOREIGN KEY (party) REFERENCES parties(id)
+);
+
 --creating defailt roles
-INSERT IGNORE INTO roles (`name`)
+INSERT IGNORE INTO
+roles  (`name`)
 VALUES ('root'),
        ('default');
 
 --inserting initial version
-INSERT INTO system (`key`, `value`) VALUES ('version', '0');
+INSERT IGNORE INTO
+system (`key`, `value`)
+VALUES ('version', '0');
 
 --recording initial time
-INSERT INTO system (`key`, `value`) VALUES ('created', UTC_TIMESTAMP());
+INSERT IGNORE INTO
+system (`key`, `value`)
+VALUES ('created', UTC_TIMESTAMP());
+
+--creating default currencies
+INSERT IGNORE INTO
+currencies (`code`, `title`,               `manual`, `description`,  `type`, `value`)
+VALUES     ('USD',  'United States Dollar', TRUE,    'Base currency', 0,      1);