add revenue now workd through shell command

internal/database/currency.go

@@ -0,0 +1,21 @@
+package database
+
+import (
+	"Portifolio/internal/model"
+	"database/sql"
+	"fmt"
+
+	_ "github.com/mattn/go-sqlite3"
+)
+
+func GetCurrencyByID(db *sql.DB, ID int) (model.Currency, error) {
+	var c model.Currency
+	err := db.QueryRow(
+		`SELECT id, code, name, FROM currencies WHERE id = ?`,
+		ID,
+	).Scan(&c.ID, &c.Code, &c.Name)
+	if err == sql.ErrNoRows {
+		return c, fmt.Errorf("company %d not found", ID)
+	}
+	return c, nil
+}