multiple tries

backend/v3/storage/database/tx.go

@@ -0,0 +1,36 @@
+package database
+
+import "context"
+
+type Transaction interface {
+	Commit(ctx context.Context) error
+	Rollback(ctx context.Context) error
+	End(ctx context.Context, err error) error
+
+	Begin(ctx context.Context) (Transaction, error)
+
+	QueryExecutor
+}
+
+type Beginner interface {
+	Begin(ctx context.Context, opts *TransactionOptions) (Transaction, error)
+}
+
+type TransactionOptions struct {
+	IsolationLevel IsolationLevel
+	AccessMode     AccessMode
+}
+
+type IsolationLevel uint8
+
+const (
+	IsolationLevelSerializable IsolationLevel = iota
+	IsolationLevelReadCommitted
+)
+
+type AccessMode uint8
+
+const (
+	AccessModeReadWrite AccessMode = iota
+	AccessModeReadOnly
+)