pub const KEY_BATCH: usize = 900;Expand description
How many keys one level’s keyed query may carry.
The binding constraint is the oldest SQLite default
(SQLITE_MAX_VARIABLE_NUMBER = 999 before 3.32); PostgreSQL and MySQL cap
a statement at 65535 parameters. 900 sits under all three with room for
the caller’s own arguments in the same statement. Override per level with
ThenLoad::batch.