The (decky_uuid VARCHAR(64), path VARCHAR(1024)) UNIQUE constraint
generated a 4352-byte composite key under utf8mb4 (4 bytes/char),
busting MySQL's 3072-byte cap and crashing decnet api on init with:
Specified key was too long; max key length is 3072 bytes
Tighten path to VARCHAR(512) — (64+512)*4 = 2304 bytes, well under
the cap. Real realism + canary placement paths are short
(/home/<persona>/Documents/<file>, ~70 chars); 512 keeps headroom
without the index hassle. Pre-v1, no migration helper.
Adds a regression test pinning the (decky_uuid + path) byte budget so
a future widening fails loudly in CI rather than at MySQL deploy
time.
anti
da3c35c6a4