fix: move implementation to "internal" package

internal/types/account.go

@@ -0,0 +1,27 @@
+package types
+
+import (
+	"time"
+
+	"github.com/google/uuid"
+)
+
+// The Account holds money.
+type Account struct {
+	Id     uuid.UUID `db:"id"`
+	UserId uuid.UUID `db:"user_id"`
+
+	// Custom Name of the account, e.g. "Bank", "Cash", "Credit Card"
+	Name string `db:"name"`
+
+	CurrentBalance  int64      `db:"current_balance"`
+	LastTransaction *time.Time `db:"last_transaction"`
+	// The current precalculated value of:
+	// 	Account.Balance - [PiggyBank.Balance...]
+	OinkBalance int64 `db:"oink_balance"`
+
+	CreatedAt time.Time  `db:"created_at"`
+	CreatedBy uuid.UUID  `db:"created_by"`
+	UpdatedAt *time.Time `db:"updated_at"`
+	UpdatedBy *uuid.UUID `db:"updated_by"`
+}