pragmas constant
Open-time PRAGMAs. WAL + synchronous=NORMAL survives process kill (only power loss can drop the WAL tail); both servers tolerate opening a database left in either journal mode.
Implementation
static const List<String> pragmas = [
'PRAGMA journal_mode = WAL;',
'PRAGMA synchronous = NORMAL;',
'PRAGMA busy_timeout = 5000;',
];