pub fn seal(b: &mut [u8], gen: u64)Expand description
Stamp the checksum over current contents. Called by the pool immediately
before write_at, and nowhere else: checksummed going to the medium,
verified coming back, in between it is just memory (DuckDB: block manager;
SQLite: cksumvfs – both at the I/O boundary, never per pin).
Stamp the publishing generation into the (formerly reserved) lsn field,
then checksum. Called at the ONLY two places bytes leave for disk
(flush_all, eviction), so every on-disk page carries the generation of
the epoch that wrote it – the ordering signal recovery’s duplicate-key
collapse needs once page numbers are recycled (2n). In-memory
finalise(0) call sites are untouched: the stamp happens on the way out.