feat(db): add migartion

Author: fiftin

db/sql/migrations/v2.15.2.err.sql

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+drop table user__email_otp;

db/sql/migrations/v2.15.2.sql

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+create table user__email_otp(
+    `id` integer primary key autoincrement,
+    `user_id` int NOT NULL,
+    `code` varchar(250) NOT NULL,
+    `created` datetime NOT NULL,
+    unique (`code`),
+    foreign key (`user_id`) references `user`(`id`) on delete cascade
+);