Commit Graph
71 Commits
Author SHA1 Message Date
Wanjohi 1301ff0806 fix(billing): a returning customer's subscription reaches their team
The provider reuses a customer it already has under the same email and
leaves our team id off it, so the subscription arrived with no team,
was acknowledged, and changed nothing: a paid plan never applied. The
checkout now carries the team in its metadata, which the subscription
keeps, and the webhook reads it there when the customer has none. A
paid delivery that still matches no team is logged instead of dropped
in silence.
2026-10-13 21:37:22 +03:00
Wanjohi 24ad9f6b78 fix(api): a Steam sign-in on any host links the account
A sign-in on a person's own host recorded the enrolment but never
linked the Steam account, so their first launch asked them to link it
again with nothing in the app to do it from. The QR sign-in is the same
proof on their host as on ours.
2026-10-11 17:33:18 +03:00
Wanjohi 84bd6b899a feat(install): the desktop app downloads from a link that never changes
/download/windows and /download/linux redirect to a one-minute signed URL
for the current desktop app, from the same private bucket as the host
agent, so a download page can link to them once and every download still
passes through the API. Which version they hand out is a constant bumped
by a commit after a release is published, as the host installer's is.

/desktop.sh installs it on Linux for the calling user: one binary in
~/.local/bin and a launcher entry, no root.
2026-10-11 14:13:44 +03:00
Wanjohi 122fc12f86 chore(install): host agent 0.2.13
(cherry picked from commit 3d381673f8)
2026-10-11 14:07:40 +03:00
Wanjohi 6a9f675b9f feat(session): runs wait in line for a free slot on their host
A host holds only so many runs at once, and until now every waiting run
was handed to it regardless; the ones it could not hold failed there.

The host now says on its heartbeat how many runs it holds, and is handed
only as many waiting runs as it has free. The rest wait in line: paid
runs before free-weekend runs, then first come first served. Reading a
waiting run returns its place in line, and says when a paid run that
asked later has gone ahead, so a free player is never reordered quietly.

A waiting run nobody has asked after for a minute was abandoned, and
leaves the line rather than holding up everyone behind it. A host that
does not report its slots is handed every run, as before.
2026-10-11 13:44:18 +03:00
Wanjohi 4627343e3c feat(trial): the free days are Saturday, Sunday and Monday
Monday in place of Friday: the window is Saturday 00:00 to Tuesday 00:00,
Helsinki time, and the refusal outside it says Saturday to Monday.
2026-10-11 13:22:22 +03:00
Wanjohi aa824a1905 feat(box): a listed box names its machine's host and whether it is the fleet
The desktop app gives a new cloud user a fleet box and then opens that
machine's Steam sign-in on its hostname; GET /box now says which hostname,
and which box is the fleet one.
2026-10-11 12:08:07 +03:00
Wanjohi 4fc93ca4aa chore(install): host agent 0.2.12 2026-10-10 20:50:54 +03:00
Wanjohi ac713e62ae feat(billing): sizes move up one; 1080p is the reference and the default
xs is a box with no stream, sm 720p, md 1080p, lg 1440p and xl 4K. Each
resolution keeps its price, so md is now 1x. New boxes default to md, and
existing boxes move up one size so none of them drops a resolution.
2026-10-10 15:18:23 +03:00
Wanjohi 8608506682 feat(session): a run picks its own size
POST /session takes an optional tier. The host starts the run at that
size, the allowance is checked against it, and the run is billed at it.
A run asked for without one runs at its box's size, as before.

The size belongs to the run rather than the box: a box is a game's
install on a machine, and the size is chosen each time it is played, so
playing bigger never means a second box and a second install.
2026-10-10 14:03:13 +03:00
Wanjohi 05a3fee87a feat(session): list your runs that have not stopped
Asking for a run on a busy box is refused, but the refusal does not say
what holds the box. A client that just lost its connection needs to know
whether the run in the way is the game it asked for, which it can rejoin,
or another one it should offer to stop. GET /session answers that.
2026-10-10 11:19:20 +03:00
Wanjohi 77595ecb65 chore(install): host agent 0.2.11 2026-10-09 13:29:58 +03:00
Wanjohi 8054e62bd9 feat(machine): let the owner read what their machine has downloaded
GET /machine/:id/downloads lists every game the machine is downloading,
has ready or failed to download, with progress and each game's name.
The library already carries a download per game, but it is the most
recent one across every host, which is not what a person watching their
own machine set up wants to see.

Owner-scoped in the query: a machine that is not yours answers 404, the
same as one that does not exist.
2026-10-09 12:50:44 +03:00
Wanjohi f0bfe82d58 feat(session): let the owner end a run
POST /session/:id/stop. A run no host has claimed ends at once; one that
is starting or live is marked with time_stop_requested and its host is
handed a session.stop with reason `user` on every poll until it reports
the run ended. The host already ends a run the same way whatever the
reason, so no host change is needed.

Asking twice keeps the first time asked, and asking of a finished run
changes nothing. Somebody else's run answers 404, and a host cannot
stop a run as its owner.
2026-10-09 12:27:09 +03:00
Wanjohi 2ca3229d57 chore(install): host agent 0.2.10 2026-10-09 11:56:43 +03:00
Wanjohi 3fbcf459f2 machine: a host reports its GPUs, and the machine keeps them
The host report gains gpus: each card's model, VRAM in MiB when the
driver says, and the PCI id it was named by. Kept on the machine (a jsonb
column, written only when it changes) and returned by /machine. What a
person calls the machine, and the first measured part of the capacity a
scheduler will place by.
2026-10-09 11:37:40 +03:00
Wanjohi 3975de5027 install: host agent 0.2.9 2026-10-09 10:33:19 +03:00
Wanjohi ba9191825c library: a sync drops the games the account no longer owns
A sync is the whole of what the account owns, but it only ever upserted,
so a revoked licence or a library from a previous Steam account stayed
listed forever. A sync that fully lands now soft-deletes the rest; an
empty list prunes nothing, and a game owned again comes back.
2026-10-08 12:19:05 +03:00
Wanjohi 4445f4836e api: accept the host's own tier label in a report
The report schema pinned each box's tier to our size enum, but hosts name
a box's shape by resolution (1080p). Every report naming a box was a 400,
so stop reasons never reached the run. Placement already stores the size;
the reported label is free text and is not stored.
2026-10-08 12:14:46 +03:00
Wanjohi 56e64d4ba8 install: host agent 0.2.8 2026-10-08 11:10:59 +03:00
Wanjohi a939defd5e install: host agent 0.2.7 2026-10-08 10:29:09 +03:00
Wanjohi 2fb59f4dd8 install: host agent 0.2.6 2026-10-08 09:58:43 +03:00
Wanjohi d89d73c263 install: host agent 0.2.5 (#368)
Pins the installer to host agent 0.2.5.
2026-10-08 06:37:58 +00:00
Wanjohi 514212bbbe Host agent runs as root; NVIDIA host programs ship in the base image (#366)
- **Installer:** piped into `sudo`, installs to `/usr/local/bin`, and
hands onboarding `/var/lib/nestri`. Root lets the host agent jail each
box under its own uid and give guests a network. A host that ran the
agent as the sudo user has that state copied over (never moved), so it
keeps its machine identity and its downloads. Pins host agent 0.2.4.
- **Base image:** `vhost-user-nvgpu` and `nvgpu-userspace`, static
(musl), from the same `NVGPU_REF` as the guest driver and Vulkan layer,
under `/boot/host`. The host agent takes them out at unpack, as it does
the kernel, and forwards the GPU when it finds the NVIDIA driver loaded.

Merge after the host agent 0.2.4 release: the installer pins it.
2026-10-07 19:59:29 +00:00
Wanjohi 7481150e97 fix(install): stop a running host agent before upgrading it 2026-10-07 19:09:01 +03:00
Wanjohi b0a42b4c37 fix(install): fetch the glibc host build, which is what releases publish from 0.2.3 2026-10-07 19:05:23 +03:00
Wanjohi 8520ddf6c5 install.sh: install host agent 0.2.3 2026-10-07 18:48:46 +03:00
Wanjohi 5bf520c464 Name the run's owner on session.start (#362)
Adds `userId` (the box owner) to `session.start` so a host knows whose
Steam sign-in plays the run. API tests: 161 pass.
2026-10-07 15:43:25 +00:00
Wanjohi 27dc33f9ab Link the Steam account when a fleet machine reports a sign-in (#360)
A QR sign-in on Nestri's own hardware proves the Steam account, so `POST
/machine/enrolment` from a machine in `FLEET_ORGANISATION_ID` also links
it to the person. Hosts somebody brought never link (a machine vouching
for itself could attach any Steam account to anyone enrolled on it). A
Steam account already linked elsewhere stays there; the report is
recorded either way.

Tests: three new in `enrolment.test.ts` (fleet links and is idempotent,
own host does not link, taken account is left alone). 164 pass.
2026-10-07 15:43:20 +00:00
Wanjohi 89fc7592e6 fix(install): install host agent 0.2.2 2026-10-07 11:03:56 +03:00
Wanjohi 543fd3f361 fix(steam): link a Steam account only through Steam's own sign-in
POST /steam/link took a Steam id from the request body and linked it. A
Steam id is public, so anyone could claim any account, its library, and
the one free weekend that is keyed on it.

Linking is now POST /steam/link/start, which returns a Steam sign-in URL
tied to a one-time, ten-minute request, and GET /steam/link/callback,
where the browser comes back. The callback accepts the id only if Steam
confirms the assertion, the assertion was issued for exactly this
callback, and the id is read from Steam's claimed identity URL in the
one shape Steam issues it. The request is spent on use.
2026-10-07 10:52:19 +03:00
Wanjohi 69ad5d09bb fix(install): install host agent 0.2.1, which ends a run the control plane stops 2026-10-07 10:25:02 +03:00
Wanjohi d92bc13ed9 feat(machine): an install command that adds a host to the fleet
An install token can now name an organisation instead of a team, and the
host it registers belongs to that organisation's fleet. Only members of
the organisation may mint one, since fleet hardware is rented to other
people. A token for both is refused, by the route and by a check
constraint, as it already is for a machine.
2026-10-07 09:42:51 +03:00
Wanjohi 47f8ff6f61 feat(trial): a free weekend on rented GPUs, for teams without a plan
A team with no plan may run on the fleet from Friday 00:00 to Monday
00:00, Helsinki time, for two hours of live play per weekend. One trial
per team, per email address and per Steam account; the claim outlives
the account, so closing it and signing up again is not a second trial.
Once five teams pay, the trial closes for everyone.

A trial run is marked on the session. Its time is counted from the run's
own live interval and kept out of the plan's allowance. Unlike an
allowance, the trial ends a run: the host's work poll now carries a
session.stop job for any trial run past its hours or its window, which
an agent that does not know the kind already skips.
2026-10-07 09:30:28 +03:00
Wanjohi 2da95deb36 feat(billing): bill a run on rented hardware to the box owner's team
A fleet machine belongs to an organisation, which is not something that
pays, so fleet runs were neither checked nor metered. The payer is now
the box owner's personal team, and the meter that starts and stops with
a run asks the same function the start check does, so the team checked
and the team billed cannot differ.
2026-10-07 09:25:32 +03:00
Wanjohi 08bbb22a1c feat(machine): rented hardware is open during a run you asked for
Fleet machines refused everyone, because nothing could yet say who had
paid for them. A run on one can only exist once it passed the start
check, so a starting or live run of your own box on that machine is now
what grants access, and it ends with the run. Holding a box is not
enough: a box costs nothing to hold.
2026-10-07 09:24:18 +03:00
Wanjohi f82666254e feat(box): create a box, on your own host or on rented GPUs
POST /box places a box once, at creation. On your own host it keeps the
existing rule (exactly one host, or refuse). On the fleet it picks an
online machine owned by the fleet organisation, the one holding the
fewest boxes. Each person holds at most one fleet box. Which organisation
is the fleet is deploy configuration, so no deployment rents hardware it
was not told to.

No machine online is a 429, since the same request succeeds once one is
back.
2026-10-07 09:23:12 +03:00
Wanjohi bc59f7842b feat(api): create a team; slugs the website serves as pages are reserved
POST /team makes another team with the caller as owner. The website now
serves a team at nestri.io/<slug>, so Team.Slug refuses its top-level
pages (home, new, pricing, ...) and a personal team whose generated slug
would be one gets a suffix instead.
2026-09-28 23:56:13 +03:00
Wanjohi df657e84ab feat(api): read and rename your teams, list their members, list your boxes
GET /team, PATCH /team/:id (owner or admin; a taken slug is a 409 on
slug), GET /team/:id/members, GET /box. A team you are not on is a 404
everywhere, so ids cannot be probed. Team.Name and Team.Slug are exported
so a client checks the same rule the API does.
2026-09-28 23:09:27 +03:00
Wanjohi 065af689b3 feat(api): serve the host installer and its downloads
GET /install.sh serves a POSIX script, embedded in the API at build time
so the script and the routes that redeem its token ship together. It
checks the platform, asks where box images should live, downloads the
host agent at a pinned version, verifies it against SHA256SUMS, installs
it for the calling user and hands over with the token in the environment
rather than argv.

GET /install/:component/:version/:asset redirects to a one-minute signed
URL on a private S3-compatible bucket, so every download passes through a
route that can be logged or switched off. The SigV4 signer is written
against Web Crypto and checked against AWS's published example.
2026-09-28 09:12:23 +03:00
Wanjohi 54dbe8628a feat(api): issue and redeem install tokens
POST /machine/install-token mints a token for a team the caller belongs
to, with the same team resolution and membership rule as /register.
POST /machine/install needs no session: it spends the token and returns
the same id, slug and one-time secret as registering directly, refusing
unknown, expired and used tokens identically.
2026-09-28 08:36:12 +03:00
Wanjohi 757ff79233 feat(core,api): take payment, and let the provider decide who is paid up
Checkout, the customer portal, and the webhook that moves a team's plan.

Nothing money-shaped is stored. No price, no currency, no card detail — a
subscription's existence and its state are the whole of what crosses back,
because they are the only two facts the product needs and anything more would
be a second copy of a record somebody else is authoritative for.

Currency is deliberately not ours to hold. A product carries a price per
currency on their side and the customer's location picks one at checkout, so
there is no figure in this API that could drift from the one somebody is
charged. The team id travels as the customer's external id, which keeps the
mapping on their side rather than putting a foreign primary key in our schema.

Access follows their state, and the interesting cases are where that is not the
same as "paying right now". Cancelling keeps the plan: they paid to the end of
the period and turning them off when they click it takes something they bought.
A failed card keeps it too, because a retry that ends in payment should not
have cost them access in the middle. Only a revoked subscription takes it away,
which is the one moment nothing is left that was paid for. An event we do not
recognise changes nothing at all — new types are added by people who do not
know what we do with them, and a default that moved a plan would eventually
cancel an account nobody cancelled.

The webhook is the only route here no session protects, because its caller has
no account and never will. A signature over the raw body stands in for one, and
it is checked before the body is looked at — a body that has been parsed and
re-serialized is not the body that was signed. With no secret configured it
refuses everything rather than accepting anything, since otherwise knowing the
URL would be enough to set somebody's plan. Note also what is absent: no route
sets a plan, so there is no endpoint for granting yourself a subscription.

The product is written down as a definition with a script rather than clicked
into a dashboard, because the two environments are separate servers and nothing
made in one can be moved to the other. Promoting it is running the same script
with the other token, which is the only version of that which cannot drift. It
writes nothing without --apply and refuses to add a second product with a name
already taken.
2026-09-19 00:57:57 +03:00
Wanjohi 4c22586d59 feat(core): price a run by the size it holds, on hardware we pay for
The rate was a constant. That was correct for everything the system can
currently run and wrong the moment it can run anything else, because a tier
buys a share of a card — so a bigger one on our own hardware is more of
something we bought being spent, and a flat rate there sells a whole card for
the price of a quarter of one.

So a run's rate now comes from what the run is: its size tier, and whose
hardware it sits on.

On the caller's own hardware the tier changes nothing. There is no share of a
card of ours in play, so a run costs one unit a second whatever size it asked
for. Charging somebody more for taking more of a GPU they bought is a tax on
their own hardware, and not doing that is most of what this model is for.

This exposed a bug in what went before. Resegmenting recomputed one shared rate
and wrote it to every open stretch, which was harmless while all runs cost the
same and would have quietly repriced an expensive run as whatever the last one
to start was. Each stretch now keeps its own rate, which is also the more
honest shape: a run's rate is a property of that run, and nothing about it
changed because a sibling appeared or the clock ticked.

The account's total is now the sum of what its runs cost rather than a count
times one rate — an expensive run and a cheap one alongside it are not two of
anything. Concurrency still lands exactly where it did, as there being more to
add, and no run gets dearer because another started.

There is no hardware factor yet and its absence is deliberate: nothing records
which card a host has, so a table keyed on a model would be keyed on nothing.
A faster card should cost more, and that starts with a column.

The reference tier is pinned at exactly one unit a second, checked rather than
assumed. The unit is a second of a reference session, so moving it would
silently redefine every allowance — the same stored number would mean a
different number of hours.
2026-09-19 00:32:01 +03:00
Wanjohi b4776fad2f feat(core,api): record burn as rate segments, and refuse the next run when spent
The counters this fills are the ones the windows already knew how to read.
What was missing was anything that put a number in them.

Burn is recorded as segments: one stretch of one run at one unchanging rate,
opened when the rate becomes true and closed when it stops being. Not a row per
session, because a session's rate does not survive its own lifetime — a second
run changes what the account spends per second while the first is still going,
and a rate that applied from that moment must not be backdated over the time
before it. Not a row per event either, because burn accrues against an envelope
that is held rather than per thing consumed.

Closing a segment is what moves burn into the counters, so a long run lands
incrementally instead of all at the end. Burn that only arrives when a session
stops is burn that cannot refuse the next one, and a bar that does not move
while something is running is a bar nobody believes.

The counters are written with the staleness rule as a single statement: add to
the total if its stamp is still inside the window, otherwise start again from
this amount. Reading and then deciding would be two statements with a gap, and
the gap is where a concurrent tick doubles or vanishes. The first tick for a
team and the thousandth are the same call, for the same reason.

The gate sits at the one moment it is allowed to speak — before a run starts,
never again. A limit refuses the next run and never interrupts one already
going; someone losing a session mid-game to a meter does not come back. Every
window is checked rather than the shortest, because they protect different
things over different spans.

The answer comes back with the created run rather than being thrown away: the
response carries where each window stands, what the account spends per second
now, and what one more run would cost. Every surface that can start a run has
to show that before the click, and a second call for it is a call nobody makes.
Asking twice would also let the number shown and the number billed disagree.

Accrual is wired to the run's own state transition, in the same transaction
that moves it. A session that went live without its meter starting is free
hardware; one that ended without its meter stopping bills forever. Both are
silent, so neither may be a second write that might not happen.
2026-09-19 00:19:39 +03:00
Wanjohi 15631f5d25 feat(core,api): an organisation owns hardware, and a domain says who belongs
Two kinds of machine were modelled as one. A host somebody brings is theirs,
reached through a team, and should die with their account. A host bought to
serve other people's workloads is none of those things — and there was nowhere
to put it, so it had to be registered under an employee's personal team, where
it was that person's property and their account going away took it with them.

Ownership becomes an either/or. A machine names a team or an organisation,
exactly one, enforced by a check constraint rather than by convention: both
null is a host nothing can bill, and both set is two answers to "whose is
this?" where whichever join a query happens to take decides who pays. Hardware
an organisation owns has no team and no person at all, which is the point.

The organisation is deliberately not a billing subject and has no plan columns.
It says who owns the metal; a team pays for what it uses either way.

Membership is derived from a verified email domain rather than stored. An
address is already the root identity, so a second record of who belongs where
is a second answer that can disagree with the first — and deriving it means
signing in with a personal address still gets an ordinary personal account,
which is what lets one person hold a company account and use the consumer
product. Nothing is granted on an unverified domain or an unverified address:
either one is a string somebody typed.

Entitlement on fleet hardware refuses everyone for now, with a reason that says
so. What grants a run on metered hardware is a plan, and there is nothing to
ask yet, so it fails closed rather than giving the expensive case away. The
branch is written out so the plan check has one obvious place to land.

Routes are read-only, and nothing seeds an organisation. Creating one grants
membership to everyone who can receive mail at a domain, so it is an operator
action against the database — a migration that inserted one would insert it
into every deployment, including ones we have nothing to do with. See
docs/deploy.md.
2026-09-18 23:16:07 +03:00
Wanjohi 4a2a4412c2 style: apply the formatter across the tree
The formatter had never been run over these files, so `oxfmt` on a couple of
touched files rewrote two dozen others and buried the real change. Running it
everywhere once makes the next diff mean something.

No behaviour changes: import ordering, line joining, and reindented JSON in
the generated migration snapshots. Both test suites and both typechecks give
the same answers as before, including the two type errors this does not fix.
2026-09-18 23:03:08 +03:00
Wanjohi 40b4270161 refactor(api)!: remove the shared operator secret, and let hosts sync their own
A single secret that turned any request into an operator was the only
credential several routes accepted, and it had no caller left: the device
pairing it existed for is on hold, and nothing in this tree or any client
sent it. What remained was a key that bypassed authentication entirely,
required to boot, and checked by nobody.

Every route behind it had a better answer available:

- Library and game sync move to host credentials. Both took a `userId` in
  the body, which meant one secret could write into anybody's library. A
  host now says which of its enrolled users a batch is for, and that claim
  is checked against the Steam sign-ins it actually holds — one box carries
  several people's accounts, so the pair is the unit.
- Download-state reporting narrows to hosts alone, and the body that could
  name a different host is gone. Which host is reporting comes from its own
  credentials, and a body that still names one is refused rather than
  ignored.
- Linking a Steam account is always for the caller.
- Creating a game by hand is deleted; syncing already upserts the catalogue.
- Reading the waitlist is deleted. Every address on it belongs to someone
  who has not agreed to anything, and answering it over HTTP made that list
  something a leaked key could drain.
- The pairing-code routes are deleted with the flow they served. The domain
  module and its table stay, so returning to it is a route file rather than
  a migration.

Nothing in the API now accepts a credential that stands for more than one
caller: every request resolves to a specific user or a specific host, which
is what lets a route say "the caller's own library" and mean it.

BREAKING CHANGE: the `x-nestri-admin-token` header is no longer accepted and
`ADMIN_SHARED_SECRET` is no longer read. `POST /games`, `GET /waitlist` and
the `/pairing-code` routes are gone; `POST /games/sync` and `POST /library/sync`
now require host credentials and take `userId` in the body; `POST /steam/link`
no longer accepts `userId`; `POST /games/download-state` no longer accepts
`hostId`.
2026-09-18 22:59:06 +03:00
Wanjohi cfb8ec26a0 feat(machine): mint a public name, and stop routing on the id
A host's hostname was its primary key. That worked and disclosed three
things it should not have: ids here are monotonic, so an id in a hostname
tells anyone who reads a URL roughly when that machine was registered and
where it falls among its owner's others; an id is the primary key, so a
name that had to change could only change by re-registering the machine,
which is changing its identity to fix its name; and the hostname is also
the OAuth audience and the cookie scope, so the id travelled into redirect
URLs and browser history.

Machines now carry a minted name -- two words and four digits, unique
across the fleet, DNS-safe by construction, which an id was not. The words
are a curated list rather than a dictionary, because every pair is shown to
strangers. Names the fleet's own infrastructure answers on are refused at
mint time: one minted onto the edge's own label would take the published
key path away from every host at once.

Minting retries on the unique index rather than checking first, because two
registrations in the same instant both read "free" and both write. Only a
name collision retries; a duplicate id or secret means something a new name
cannot fix.

The migration adds the column in three steps. Generated as a NOT NULL
column it fails outright against a populated table, and a default would be
worse: every row would share one value on a routing key.
2026-09-18 00:36:13 +03:00
Wanjohi b00f1064ae fix(api,auth)!: bind loopback by default, and let a container ask for more
Both servers bound `0.0.0.0`. That was harmless while the only deployment was
docker-compose.yml, which publishes these ports on 127.0.0.1 and makes the
container's own bind irrelevant. As ordinary processes on a rented machine
there is no such wrapper, and `0.0.0.0` is a listener on the internet — in
front of an issuer that sets cookies without `Secure` and mints sign-in codes,
because it expects something else to be terminating TLS.

So the default is `127.0.0.1` and `HOST` is there for the deployment that
genuinely needs every interface. compose now sets `HOST: 0.0.0.0` explicitly,
which is not a workaround: inside a container, binding loopback is what would
make the published port unreachable. The right answer differs by deployment,
which is why it is a variable rather than a constant.

Both now log the address they bound, not the one they hoped for.

BREAKING CHANGE: api and auth no longer listen on every interface by default.
A deployment that relied on that must set HOST=0.0.0.0.
2026-09-16 23:10:22 +03:00
Wanjohi 51d25f3e8c fix(machine): a taken endpoint id is a conflict, not a server fault
A host reporting an endpoint id another machine already holds hit the unique
index, and the raw refusal reached the global handler as a 500 -- telling a
host its beat broke the server rather than that the id is taken. It is now the
409 every other conflict here gives, and the route documents it.

Checked-then-written would be worse rather than better: two hosts reporting the
same id in the same instant both read "nobody holds it" and both write, which
is precisely what the index is for. The read would add a query and remove
nothing.

Before:
  expect(res.status).toBe(409)
  Received: 500
2026-09-07 00:19:34 +03:00