Catapult_sqliteSourceBackend that writes directly to a Sqlite database.
The database path is either directly provided with "TRACE_DB" or set_file, or it's a file named after the trace ID in the directory set by set_dir (or the default directory otherwise).
The trace ID is determined by "TRACE_ID" if present, otherwise auto-generated or set via set_trace_id.
Set level of crash safety for sqlite. See Writer.create for more details.
Multiprocess mode? If true, then the file will not be truncated.
Set directory in which to store the database by its trace ID.
Set database path to use. If not specified, it will be picked from the trace ID, and the directory set_dir.