virtual ~TransactionManager() = default;

// Transaction lifecycle

virtual bool begin() = 0;

virtual bool commit() = 0;

virtual bool rollback() = 0;

// Savepoints

virtual bool savepoint(const char* name) = 0;

virtual bool rollback_to(const char* name) = 0;

virtual bool release_savepoint(const char* name) = 0;

// State

virtual bool in_transaction() const = 0;

virtual bool is_auto_commit() const = 0;

virtual void set_auto_commit(bool ac) = 0;

// Distributed transaction support. Override in DistributedTransactionManager.

virtual bool is_distributed() const { return false; }

// Route DML through the transaction's pinned session for a given backend.

// Default: returns DmlResult with success=false.

// DistributedTransactionManager overrides to route through execute_participant_dml.

virtual DmlResult route_dml(const char* /*backend_name*/,

sql_parser::StringRef /*sql*/) {

DmlResult r;

r.error_message = "route_dml not supported by this transaction manager";

return r;

}