createSavepoint method
Creates a savepoint named name inside this transaction.
The savepoint name MUST match the identifier grammar enforced by the
engine (ASCII letter or _, then letters/digits/_, ≤128 chars).
Names containing semicolons, quotes or whitespace are rejected at the
FFI boundary (B1 fix in v3.1).
Implementation
bool createSavepoint(String name) => _backend.createSavepoint(_txnId, name);