fix: non-nullable compatibility info (#15)

Author: Feyko

db/postgres/postgres_types.go

@@ -1,12 +1,8 @@
 package postgres
 
 import (
-	"database/sql/driver"
-	"encoding/json"
 	"time"
 
-	"github.com/pkg/errors"
-
 	"gorm.io/gorm"
 )
 
@@ -65,7 +61,7 @@ type Mod struct {
 	LastVersionDate  *time.Time
 	ModReference     string
 	Hidden           bool
-	Compatibility    *CompatibilityInfo
+	Compatibility    *CompatibilityInfo `gorm:"serializer:json"`
 
 	Users []User `gorm:"many2many:user_mods;"`
 
@@ -187,17 +183,6 @@ type CompatibilityInfo struct {
 	EXP Compatibility `gorm:"type:compatibility"`
 }
 
-func (c *CompatibilityInfo) Value() (driver.Value, error) {
-	b, err := json.Marshal(c)
-	return b, errors.Wrap(err, "failed to marshal")
-}
-
-func (c *CompatibilityInfo) Scan(src any) error {
-	v := src.([]byte)
-	err := json.Unmarshal(v, c)
-	return errors.Wrap(err, "failed to unmarshal")
-}
-
 type Compatibility struct {
 	State string
 	Note  string