优化数据库结构与数据插入逻辑

cmd/playground/main.go

@@ -1,7 +1,10 @@
 package main
 
+import (
+	"fmt"
+	"time"
+)
+
 func main() {
-	println(rune('\r'))
-	println(rune('\n'))
-	println(rune('|'))
+	fmt.Printf("%v\n", time.Now())
 }