feat: extract types to seperate files

types/transaction.go

@@ -0,0 +1,37 @@
+package types
+
+import (
+	"time"
+
+	"github.com/google/uuid"
+)
+
+// At the center of the application is the transaction.
+//
+// Every piece of data should be calculated based on transactions.
+// This means potential calculation errors can be fixed later in time.
+//
+// If it becomes necessary to precalculate snapshots for performance reasons, this can be done in the future.
+// But the transaction should always be the source of truth.
+type Transaction struct {
+	Id     uuid.UUID
+	UserId uuid.UUID `db:"user_id"`
+
+	AccountId uuid.UUID `db:"account_id"`
+	// nil indicates that the transaction is not yet associated with a piggy bank
+	TreasureChestId *uuid.UUID `db:"treasure_chest_id"`
+
+	// The internal transaction is amove between e.g. an account and a piggy bank to execute a savings plan
+	Internal bool
+
+	// The value of the transacion. Negative for outgoing and positive for incoming
+	Value     int64
+	Timestamp time.Time
+
+	Note string
+
+	CreatedAt time.Time  `db:"created_at"`
+	CreatedBy uuid.UUID  `db:"created_by"`
+	UpdatedAt *time.Time `db:"updated_at"`
+	UpdatedBy *uuid.UUID `db:"updated_by"`
+}