migrations: merge pnl, strategy migration

migrations/mysql/20200721225616_trades.sql

@@ -20,6 +20,9 @@ CREATE TABLE `trades`
     `is_margin`      BOOLEAN                 NOT NULL DEFAULT FALSE,
     `is_isolated`    BOOLEAN                 NOT NULL DEFAULT FALSE,
 
+    `strategy`       VARCHAR(32)             NULL,
+    `pnl`            DECIMAL                 NULL,
+
     PRIMARY KEY (`gid`),
     UNIQUE KEY `id` (`exchange`, `symbol`, `side`, `id`)
 );

migrations/mysql/20210215203116_add_pnl_column.sql

@@ -1,19 +1,9 @@
 -- +up
 -- +begin
-ALTER TABLE `trades` ADD COLUMN `pnl` DECIMAL NULL;
+SELECT 1;
 -- +end
 
--- +begin
-ALTER TABLE `trades` ADD COLUMN `strategy` VARCHAR(32) NULL;
--- +end
-
-
 -- +down
-
 -- +begin
-ALTER TABLE `trades` DROP COLUMN `pnl`;
+SELECT 1;
--- +end
-
--- +begin
-ALTER TABLE `trades` DROP COLUMN `strategy`;
 -- +end