feat: transaction activity audit and account activity audit

internal/model/transaction_audit_log.go

@@ -0,0 +1,26 @@
+package model
+
+import "time"
+
+type TransactionAuditAction string
+
+const (
+	TransactionAuditActionCreated TransactionAuditAction = "transaction.created"
+	TransactionAuditActionEdited  TransactionAuditAction = "transaction.edited"
+	TransactionAuditActionDeleted TransactionAuditAction = "transaction.deleted"
+)
+
+type TransactionAuditLog struct {
+	ID            string                 `db:"id"`
+	TransactionID string                 `db:"transaction_id"`
+	ActorID       *string                `db:"actor_id"`
+	Action        TransactionAuditAction `db:"action"`
+	Metadata      []byte                 `db:"metadata"`
+	CreatedAt     time.Time              `db:"created_at"`
+}
+
+type TransactionAuditLogWithActor struct {
+	TransactionAuditLog
+	ActorName  *string `db:"actor_name"`
+	ActorEmail *string `db:"actor_email"`
+}