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vendor/yiisoft/yii2/i18n/migrations/schema-sqlite.sql

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+/**
+ * Database schema required by \yii\i18n\DbMessageSource.
+ *
+ * @author Dmitry Naumenko <d.naumenko.a@gmail.com>
+ * @link https://www.yiiframework.com/
+ * @copyright 2008 Yii Software LLC
+ * @license https://www.yiiframework.com/license/
+ * @since 2.0.7
+ */
+
+drop table if exists `source_message`;
+drop table if exists `message`;
+
+CREATE TABLE `source_message`
+(
+   `id`          integer PRIMARY KEY AUTOINCREMENT NOT NULL,
+   `category`    varchar(255),
+   `message`     text
+);
+
+CREATE TABLE `message`
+(
+   `id`          integer NOT NULL REFERENCES `source_message` (`id`) ON UPDATE RESTRICT ON DELETE CASCADE,
+   `language`    varchar(16) NOT NULL,
+   `translation` text,
+   PRIMARY KEY (`id`, `language`)
+);
+
+CREATE INDEX idx_message_language ON message (language);
+CREATE INDEX idx_source_message_category ON source_message (category);