chore: tweak scripts

store/db/mysql/migration/prod/0.19/00__add_resource_name.sql

-ALTER TABLE `memo` ADD COLUMN `resource_name` VARCHAR(256) NOT NULL AFTER `id`;
+ALTER TABLE `memo` ADD COLUMN `resource_name` VARCHAR(256) AFTER `id`;
 
 UPDATE `memo` SET `resource_name` = uuid();
 
+ALTER TABLE `memo` MODIFY COLUMN `resource_name` VARCHAR(256) NOT NULL;
+
 CREATE UNIQUE INDEX idx_memo_resource_name ON `memo` (`resource_name`);
 
-ALTER TABLE `resource` ADD COLUMN `resource_name` VARCHAR(256) NOT NULL AFTER `id`;
+ALTER TABLE `resource` ADD COLUMN `resource_name` VARCHAR(256) AFTER `id`;
 
 UPDATE `resource` SET `resource_name` = uuid();
 
+ALTER TABLE `resource` MODIFY COLUMN `resource_name` VARCHAR(256) NOT NULL;
+
 CREATE UNIQUE INDEX idx_resource_resource_name ON `resource` (`resource_name`);

store/db/sqlite/migration/prod/0.19/00__add_resource_name.sql

-ALTER TABLE memo ADD COLUMN resource_name TEXT NOT NULL;
+ALTER TABLE memo ADD COLUMN resource_name TEXT;
 
 UPDATE memo SET resource_name = lower(hex(randomblob(8)));
 
 CREATE UNIQUE INDEX idx_memo_resource_name ON memo (resource_name);
 
-ALTER TABLE resource ADD COLUMN resource_name TEXT NOT NULL;
+ALTER TABLE resource ADD COLUMN resource_name TEXT;
 
 UPDATE resource SET resource_name = lower(hex(randomblob(8)));