implement dbhandler package and new test file

models/person.go

@@ -1,7 +1,29 @@
 package models
 
+import (
+	"database/sql/driver"
+	"encoding/json"
+	"fmt"
+)
+
+type Persons []Person
+
 type Person struct {
-	Id        int    `json:"id,omitEmpty"`
-	FirstName string `json:"firstName"`
-	LastName  string `json:"lastName"`
+	Id        int    `gorm:"primaryKey" json:"id"`
+	FirstName string `gorm:"column:firstName" json:"firstName"`
+	LastName  string `gorm:"column:lastName" json:"lastName"`
+}
+
+// --- Implement driver.Valuer (for saving to DB)
+func (r Persons) Value() (driver.Value, error) {
+	return json.Marshal(r)
+}
+
+// --- Implement sql.Scanner (for reading from DB)
+func (r *Persons) Scan(value any) error {
+	bytes, ok := value.([]byte)
+	if !ok {
+		return fmt.Errorf("failed to unmarshal Settings: %v", value)
+	}
+	return json.Unmarshal(bytes, r)
 }