feat: improve db logic and logger(untested)

internal/logger/logger.go

@@ -1,8 +1,12 @@
 package logger
 
 import (
+	"io"
 	"log/slog"
 	"os"
+	"path/filepath"
+
+	"gopkg.in/natefinch/lumberjack.v2"
 )
 
 type Logger struct {
@@ -10,13 +14,28 @@ type Logger struct {
 }
 
 func New(debug bool) *Logger {
+	logDir := "/var/log/banforge"
+	if err := os.MkdirAll(logDir, 0755); err != nil {
+		return nil
+	}
+
+	fileWriter := &lumberjack.Logger{
+		Filename:   filepath.Join(logDir, "banforge.log"),
+		MaxSize:    500,
+		MaxBackups: 3,
+		MaxAge:     28,
+		Compress:   true,
+	}
+
 	var level slog.Level
 	if debug {
 		level = slog.LevelDebug
 	} else {
 		level = slog.LevelInfo
 	}
-	handler := slog.NewJSONHandler(os.Stdout, &slog.HandlerOptions{
+	multiWriter := io.MultiWriter(fileWriter, os.Stdout)
+
+	handler := slog.NewTextHandler(multiWriter, &slog.HandlerOptions{
 		Level: level,
 	})