feat(database): remove useless code

internal/database/database.go

@@ -1,40 +1,3 @@
 package database
 
-import (
-	"fmt"
-
-	"github.com/jmoiron/sqlx"
-
-	_ "github.com/lib/pq"
-)
-
 type RowMap = map[string]interface{}
-
-type DB struct {
-	*sqlx.DB
-}
-
-type Option struct {
-	Host   string
-	Port   string
-	User   string
-	Pass   string
-	DbName string
-}
-
-func Open(option Option) (*DB, error) {
-	return OpenWith(option.Host, option.Port, option.User, option.Pass, option.DbName)
-}
-
-func OpenWith(host, port, user, pass, dbName string) (*DB, error) {
-	db, err := sqlx.Open(
-		"postgres",
-		fmt.Sprintf("postgres://%s:%s@%s:%s/%s?sslmode=disable",
-			user,
-			pass,
-			host,
-			port,
-			dbName),
-	)
-	return &DB{db}, err
-}