Minting derived a measuring tool's asset number from the HOSTNAME, so a
permanent instrument inherited the identity of whichever PC drove it that week:
replace the PC and either the number lies or a second tool appears for the same
physical unit. And because idempotency was keyed on the collector's own label,
it could not see a tool it had not created - on prod that left 43 legacy MT-####
tools shadowed by minted <HOST>-CMM twins, three records deep in places.
Resolution order is now most-stable-identity-first: the instrument named by
measuringtool-id.txt, then a prior collector link, then a tool this PC already
controls that somebody else created, then the reported machine number, and only
then mint. What minting produces should be read as a placeholder until a real
identifier is recorded.
Three separate 500 loops came out of the same mistake, looking a relationship up
by LABEL when assetrelationships is unique on (source, target, type):
- On a CMM the instrument IS the reported bay, so the machine sync has already
made a row for that exact triple - and it finds its own rows by that label.
Relabelling hid the link, so the next cycle built a second row for the same
triple and MySQL rejected it: 200 once, then 500 forever. The machine link is
now recognised and left alone; adoption only needs the identity.
- A part-marker PC hit it twice over, once on its partof row and once because
the marker's asset number is derived from the PC and could already be taken.
Both are get-or-create on the triple now, and an existing asset of that number
is adopted rather than duplicated.
A named instrument also supersedes a minted twin properly: the stale link is
archived by TARGET, not by object identity, which is what left a PC reading as
the controller of two instruments.
Reported identifiers are matched exactly rather than with ilike. They arrive
from a text file on a shopfloor PC, and ilike reads _ and % as wildcards, so
MT-600_ adopted MT-6001 and a bare % adopted whatever active asset came first.
A named id that is not a measuring tool is refused with a warning rather than
linked as one.
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