Working off some more backlog. Used the preceding work on bit-alignment (vs byte) of link and sieve to mask links, no longer setting all bits in the word for the terminal value. Then applied this guard to merge a couple of 1-bit values that were being stored as a 1-byte, into adjacent restricted pk values. This saves one byte per row in the strong_tx and point (previously implemented) tables (~3.5GiB total). This compression can also be applied to a couple of other tables.