feat: transaction activity audit and account activity audit

internal/model/account_activity.go

@@ -0,0 +1,18 @@
+package model
+
+import "time"
+
+// AccountActivityRow is a unified row representing either an account-scoped space
+// audit entry or a transaction audit entry that belongs to the account. Exactly one
+// of SpaceLog / TxLog is set.
+type AccountActivityRow struct {
+	SpaceLog *SpaceAuditLogWithActor
+	TxLog    *TransactionAuditLogWithActor
+}
+
+func (r AccountActivityRow) Timestamp() time.Time {
+	if r.SpaceLog != nil {
+		return r.SpaceLog.CreatedAt
+	}
+	return r.TxLog.CreatedAt
+}

internal/model/space_audit_log.go

@@ -11,6 +11,9 @@ const (
 	SpaceAuditActionMemberJoined    SpaceAuditAction = "member.joined"
 	SpaceAuditActionMemberRemoved   SpaceAuditAction = "member.removed"
 	SpaceAuditActionInviteCancelled SpaceAuditAction = "invite.cancelled"
+	SpaceAuditActionAccountCreated  SpaceAuditAction = "account.created"
+	SpaceAuditActionAccountRenamed  SpaceAuditAction = "account.renamed"
+	SpaceAuditActionAccountDeleted  SpaceAuditAction = "account.deleted"
 )
 
 type SpaceAuditLog struct {

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"`
+}