Add the fluksio CLI: serve, enroll, worker

`pip install fluksio && fluksio serve` on a machine with no Docker, no
database and no configuration — which is the case this is for: a node on
a cluster where ports cannot be opened. It makes its data directory, its
key and an admin account, prints the password once, and serves. Pairing
is `fluksio enroll <code> --portal …`, doing what the Settings screen
does through the same function, before the engine starts and without one
running — a machine nobody can route to has no browser pointed at it
either. The portal serves the dashboard, so nothing is served here.

Two things had to give way. `fastapi[standard]` pulls a cloud CLI that
wants sentry-sdk 2.x while we pinned below it — no pip resolution
existed, so the pin is lifted, which the comment beside it had been
waiting for and which also lets the Python cap go. And `uv` is now a
dependency rather than something to find on PATH: the Modules screen is
how a data scientist installs torch, and it was quietly falling back to
the engine's own interpreter.

The CLI imports nothing from the engine before it has set DATA_DIR — the
settings are built on the first import of core.config, and reaching it
early put the database in the working directory. There is a test for
that now, because the failure is silent.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

.gitea/workflows/publish.yml

@@ -0,0 +1,45 @@
+# Publish both distributions to PyPI on a version tag.
+#
+# Tags are the trigger rather than pushes to main: a release is a decision, and
+# a version already on PyPI cannot be replaced.
+name: Publish
+
+on:
+  push:
+    tags:
+      - "v*"
+
+jobs:
+  publish:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.10"
+      - name: Set up uv
+        uses: astral-sh/setup-uv@v7
+      - name: The tag is what the packages say they are
+        # Publishing 0.2.0 from a v0.3.0 tag is the kind of thing nobody
+        # notices until an install pulls the wrong one.
+        run: |
+          version="${GITHUB_REF_NAME#v}"
+          for project in backend worker; do
+            declared=$(uv version --short --directory "$project")
+            [ "$declared" = "$version" ] || {
+              echo "$project declares $declared, tag says $version" >&2
+              exit 1
+            }
+          done
+      - run: uv build --all-packages --out-dir dist
+      - name: Both wheels install and run
+        run: |
+          uv run --no-project --with dist/fluksio_worker-*.whl fluksio-worker --help
+          uv run --no-project --with dist/fluksio-*.whl --with dist/fluksio_worker-*.whl \
+            fluksio --version
+      - name: Publish
+        env:
+          UV_PUBLISH_TOKEN: ${{ secrets.PYPI_TOKEN }}
+        run: uv publish dist/*

Makefile

@@ -4,7 +4,7 @@
 
 .PHONY: dev-utils dev dev-local up down update install dev-backend dev-frontend \
         generate-client seed-example seed-demo seed-house seed-aircon seed-hosted-demo test test-backend test-frontend soak bench-startup lint lint-backend \
-        lint-frontend format-frontend umami clean help
+        lint-frontend format-frontend umami build clean help
 
 COMPOSE_ROOT := $(CURDIR)
 # Explicit project name keeps this stack isolated from the sibling website
@@ -161,6 +161,9 @@ bench-startup:  ## Time submitting a run (BENCH_ARGS="--kedro ../some/kedro/proj
 
 # ── Linting ───────────────────────────────────────────────────────
 
+build:  ## Build the fluksio and fluksio-worker wheels into dist/
+	uv build --all-packages --out-dir dist
+
 lint: lint-backend lint-frontend  ## Run all linters
 
 lint-backend:  ## Lint backend with ruff + mypy

README.md

@@ -10,13 +10,35 @@ repo holds the FastAPI backend, the flow engine, and the dashboard SPA. It is se
 ## Layout
 
 ```text
-backend/        FastAPI + SQLModel + Alembic + SQLite
+backend/        FastAPI + SQLModel + Alembic + SQLite — the `fluksio` distribution
   fluksio/flow/ the flow engine (nodes, pipeline, state backends, controller)
+  fluksio/cli.py  `fluksio serve` / `enroll` / `worker`
+worker/         the `fluksio-worker` distribution: the agent and the node runner
 frontend/       React 19 + TanStack Router + Tailwind 4 + shadcn/ui
 docker/         compose.yml → compose.dev.yml → compose.local.yml (+ compose.traefik.yml)
 scripts/        generate-client.sh, test.sh
 ```
 
+## Install without Docker
+
+```sh
+pip install fluksio
+fluksio serve                       # ~/.fluksio, SQLite, prints an admin password once
+fluksio enroll <code> --portal https://hub.fluksio.com   # watch it from the portal
+```
+
+Nothing else has to be running. `--data-dir` puts the installation somewhere else —
+worth it on a cluster, where `$HOME` is often a network filesystem SQLite cannot use.
+The dashboard is served by the portal, so a machine with no inbound route is reached
+without opening a port: it dials out.
+
+A machine that should only *run nodes* for an engine elsewhere installs less:
+
+```sh
+pip install fluksio-worker
+fluksio-worker --url wss://api.example.com/api/v1/workers/attach --token "$TOKEN" --labels gpu
+```
+
 ## Getting started
 
 Normally driven from the workspace root (`make init` once, then `make dev`). Standalone:

backend/fluksio/__init__.py

@@ -0,0 +1,43 @@
+"""The Fluksio engine.
+
+Inside a node, ``import fluksio`` is not this package: the worker installs a
+reporter of its own under that name before any node code runs, so what a node
+gets is :mod:`fluksio_worker.worker_main`'s ``emit`` and ``save_artifact``.
+The stubs below stand in the same place everywhere else, and say so rather
+than failing as a missing attribute.
+
+Nothing is imported from the rest of the package here. Every ``from fluksio.x
+import y`` in the engine passes through this module, and an import cycle or a
+second of start-up cost would both begin here.
+"""
+
+from importlib.metadata import PackageNotFoundError
+from importlib.metadata import version as _version
+from typing import Any
+
+try:
+    __version__ = _version("fluksio")
+except PackageNotFoundError:  # pragma: no cover - a checkout that was never installed
+    __version__ = "0.0.0+unknown"
+
+_OUTSIDE = (
+    "fluksio.{name}() only works inside a node: the worker running it installs "
+    "the real one. There is nothing to {verb} out here."
+)
+
+
+def emit(**ports: Any) -> None:
+    """Publish values on a node's declared output ports, mid-run."""
+    raise RuntimeError(_OUTSIDE.format(name="emit", verb="emit to"))
+
+
+def save_artifact(
+    source: Any, name: str = "", media_type: str = "application/octet-stream"
+) -> dict[str, Any]:
+    """Put bytes in the artifact store and return a reference to them."""
+    raise RuntimeError(_OUTSIDE.format(name="save_artifact", verb="save to"))
+
+
+def load_artifact(ref: dict[str, Any]) -> bytes:
+    """Read back what an artifact reference points at."""
+    raise RuntimeError(_OUTSIDE.format(name="load_artifact", verb="load from"))

backend/fluksio/api/routes/cloud.py

@@ -15,11 +15,11 @@ from __future__ import annotations
 import asyncio
 import logging
 import secrets
-from datetime import datetime, timezone
 from typing import Any
 
 import httpx
 from fastapi import APIRouter, Depends, HTTPException, Request
+from fastapi.concurrency import run_in_threadpool
 from pydantic import BaseModel, Field
 from sqlmodel import select
 
@@ -31,6 +31,7 @@ from fluksio.api.deps import (
     get_current_user,
 )
 from fluksio.cloud import config as cloud_config
+from fluksio.cloud import enroll as enroll_mod
 from fluksio.core.security import get_password_hash
 from fluksio.models import Message, User, UserPublic
 
@@ -83,72 +84,16 @@ async def enroll(
     installation, so the owner's portal sessions arrive here as them. Widening
     that to anyone else is a local decision made one person at a time, below —
     never something the portal can do from its side.
+
+    The same work as `fluksio enroll` on the command line, which is how a
+    machine with no browser pointed at it does this.
     """
-    if cloud_config.exists():
-        raise HTTPException(
-            status_code=409,
-            detail="This installation is already connected to a portal",
-        )
-
-    base = body.portal_url.rstrip("/")
     try:
-        async with httpx.AsyncClient(timeout=15.0) as client:
-            response = await client.post(
-                f"{base}/api/v1/enroll/",
-                json={"claim_code": body.claim_code, "app_version": "0.1.0"},
-            )
-    except httpx.HTTPError as exc:
-        raise HTTPException(
-            status_code=502, detail=f"Could not reach the portal: {exc}"
-        ) from exc
-    if response.status_code == 404:
-        raise HTTPException(
-            status_code=400, detail="That claim code is unknown or has expired"
+        await run_in_threadpool(
+            enroll_mod.enroll, session, current_user, body.portal_url, body.claim_code
         )
-    if response.status_code != 200:
-        raise HTTPException(
-            status_code=502,
-            detail=f"The portal refused the claim ({response.status_code})",
-        )
-
-    data = response.json()
-    owner_id = data.get("owner_id")
-    if not owner_id:
-        # A portal older than remote users does not say who owns the
-        # installation, and without that the enrolling account cannot be mapped
-        # to anyone — which would leave the portal connected but refused here.
-        raise HTTPException(
-            status_code=502,
-            detail="That portal is too old for this installation: it did not "
-            "say which account owns the installation",
-        )
-    config = cloud_config.CloudConfig(
-        portal_url=base,
-        ws_url=data["ws_url"],
-        installation_id=data["installation_id"],
-        token=data["installation_token"],
-        issuer=data["issuer"],
-        # Pinned here, at the one moment the claim code proves who we are
-        # talking to. Nothing refreshes this.
-        jwks=data["jwks"],
-        local_user_id=str(current_user.id),
-        enrolled_at=datetime.now(timezone.utc).isoformat(),
-        portal_account=current_user.email,
-    )
-    cloud_config.save(config)
-
-    owner_id = str(owner_id)
-    # Re-enrolling from a different local account moves the mapping rather than
-    # leaving two accounts claiming the same portal identity, which the unique
-    # index would refuse and the lookup could not choose between anyway.
-    for other in session.exec(
-        select(User).where(User.portal_sub == owner_id, User.id != current_user.id)
-    ):
-        other.portal_sub = None
-        session.add(other)
-    current_user.portal_sub = owner_id
-    session.add(current_user)
-    session.commit()
+    except enroll_mod.EnrollError as exc:
+        raise HTTPException(status_code=exc.status, detail=exc.detail) from exc
 
     _start_connector(request.app)
     return Message(message="Connected to the portal")

backend/fluksio/cli.py

@@ -0,0 +1,290 @@
+"""`fluksio serve`, `fluksio enroll`, `fluksio worker`.
+
+The point of this module is a machine nobody can route to: a node on a cluster
+where ports cannot be opened, or a laptop with no Docker. `fluksio serve`
+starts the engine with no infrastructure and no configuration; `fluksio enroll`
+hands it a claim code, and it dials the portal itself. What a browser would
+have done locally is then done through the portal, which serves the dashboard
+from its own side.
+
+Nothing from the engine is imported at module level. `fluksio.core.config`
+builds its settings when it is first imported, and the database engine and the
+user venv's path are computed from those — so the environment has to be right
+before any of that happens, which is what `_configure_environment` is for.
+"""
+
+from __future__ import annotations
+
+import argparse
+import os
+import secrets
+import sys
+from pathlib import Path
+
+import fluksio
+
+#: Where an installation keeps everything, unless it is told otherwise.
+DEFAULT_HOME = Path("~/.fluksio")
+
+#: WAL — what lets readers work while the engine writes — is not supported on
+#: these. The database would be corrupt or locked, so it is worth saying.
+NETWORK_FILESYSTEMS = ("nfs", "nfs4", "cifs", "smb", "smb3", "lustre", "fuse.sshfs")
+
+
+def _say(message: str = "") -> None:
+    """Print, and mean it.
+
+    Redirected to a file or a journal, stdout is block-buffered, and the admin
+    password below is shown exactly once — sitting in a buffer until the
+    process exits is the same as never printing it.
+    """
+    print(message, flush=True)
+
+
+def _data_dir(raw: str | None) -> Path:
+    path = Path(raw).expanduser() if raw else DEFAULT_HOME.expanduser()
+    path.mkdir(parents=True, exist_ok=True)
+    return path.resolve()
+
+
+def _warn_if_networked(path: Path) -> None:
+    """A cluster's $HOME is often NFS, and SQLite's WAL does not work there."""
+    try:
+        mounts = Path("/proc/mounts").read_text().splitlines()
+    except OSError:  # pragma: no cover - not Linux
+        return
+    best, kind = "", ""
+    for line in mounts:
+        parts = line.split()
+        if len(parts) < 3:
+            continue
+        point, fstype = parts[1], parts[2]
+        if (path == Path(point) or point in map(str, path.parents)) and len(
+            point
+        ) > len(best):
+            best, kind = point, fstype
+    if kind in NETWORK_FILESYSTEMS:
+        print(
+            f"warning: {path} is on {kind}, where SQLite's write-ahead log does "
+            "not work. Point --data-dir at local disk.",
+            file=sys.stderr,
+            flush=True,
+        )
+
+
+def load_or_create_secret_key(path: Path) -> str:
+    """The key that signs sessions and encrypts the secrets store, kept once.
+
+    Regenerating it per process would sign out every session on restart and,
+    worse, leave `secrets.enc` unreadable.
+    """
+    if path.exists():
+        return path.read_text().strip()
+    key = secrets.token_urlsafe(32)
+    path.parent.mkdir(parents=True, exist_ok=True)
+    path.write_text(key)
+    path.chmod(0o600)
+    return key
+
+
+def _configure_environment(data_dir: Path) -> None:
+    """Everything the settings need, before anything reads them.
+
+    Imports nothing from the engine, deliberately: the first import of
+    `fluksio.core.config` builds the settings, and any engine module reaches it
+    within an import or two. Doing that here would fix `DATA_DIR` at whatever
+    the current directory happened to be.
+
+    `setdefault` throughout: an operator who exported one of these means it.
+    """
+    os.environ.setdefault("DATA_DIR", str(data_dir))
+    # Without this the settings would read whatever `../.env` resolves to from
+    # the current directory — a checkout's development configuration, if the
+    # command happened to be run from inside one.
+    os.environ.setdefault("FLUKSIO_ENV_FILE", str(data_dir / "env"))
+    os.environ.setdefault(
+        "SECRET_KEY", load_or_create_secret_key(data_dir / "secret_key")
+    )
+
+
+def _prepare(data_dir: Path) -> None:
+    _warn_if_networked(data_dir)
+    _configure_environment(data_dir)
+    from fluksio.core.db import engine, prepare
+
+    prepare(engine)
+
+
+def _enroll(portal: str, code: str, as_email: str | None) -> int:
+    from sqlmodel import Session
+
+    from fluksio.cloud import enroll as enroll_mod
+    from fluksio.core.bootstrap import ensure_superuser, pick_superuser
+    from fluksio.core.config import settings
+    from fluksio.core.db import engine
+
+    with Session(engine) as session:
+        _, generated = ensure_superuser(session, email=as_email)
+        if generated:
+            _print_new_admin(session, generated)
+        try:
+            user = pick_superuser(session, as_email)
+        except LookupError as exc:
+            print(f"error: {exc}", file=sys.stderr, flush=True)
+            return 1
+        try:
+            config = enroll_mod.enroll(session, user, portal, code)
+        except enroll_mod.AlreadyEnrolled as exc:
+            print(
+                f"error: {exc.detail} (see {settings.CLOUD_CONFIG_FILE}).",
+                file=sys.stderr,
+                flush=True,
+            )
+            return 1
+        except enroll_mod.EnrollError as exc:
+            print(f"error: {exc.detail}", file=sys.stderr, flush=True)
+            return 1
+
+    _say(
+        f"Connected to {config.portal_url} as {user.email} "
+        f"(installation {config.installation_id})."
+    )
+    return 0
+
+
+def _print_new_admin(session: object, password: str) -> None:
+    from sqlmodel import Session, select
+
+    from fluksio.models import User
+
+    assert isinstance(session, Session)
+    user = session.exec(
+        select(User).where(User.is_superuser == True)  # noqa: E712
+    ).first()
+    _say(f"Created the admin account {user.email if user else ''}")
+    _say(f"  password: {password}")
+    _say("  Shown once. Change it from the dashboard.")
+
+
+def cmd_serve(args: argparse.Namespace) -> int:
+    data_dir = _data_dir(args.data_dir)
+    _prepare(data_dir)
+
+    from sqlmodel import Session
+
+    from fluksio.cloud import config as cloud_config
+    from fluksio.core.bootstrap import ensure_superuser
+    from fluksio.core.db import engine
+
+    with Session(engine) as session:
+        _, generated = ensure_superuser(
+            session, email=args.admin_email, password=args.admin_password
+        )
+        if generated:
+            _print_new_admin(session, generated)
+
+    if args.enroll:
+        if not args.portal:
+            print("error: --enroll needs --portal", file=sys.stderr, flush=True)
+            return 1
+        if not cloud_config.exists():
+            # Before the engine starts, so the connector finds the config and
+            # dials out as part of coming up rather than needing a restart.
+            failed = _enroll(args.portal, args.enroll, args.admin_email)
+            if failed:
+                return failed
+
+    import uvicorn
+
+    from fluksio.main import app
+
+    config = cloud_config.load()
+    _say(f"Fluksio {fluksio.__version__} — data in {data_dir}")
+    _say(f"  API      http://{args.host}:{args.port}{'/api/v1'}")
+    if config is not None:
+        _say(f"  Portal   {config.portal_url}, installation {config.installation_id}")
+        _say("  The dashboard is served by the portal; nothing is served here.")
+    else:
+        _say("  No portal. Pair this installation with:")
+        _say("    fluksio enroll <code> --portal https://hub.example.com")
+
+    # One process: it holds the flow engine, and a second worker would be a
+    # second engine — duplicated subscriptions, cron ticks and webhooks.
+    uvicorn.run(app, host=args.host, port=args.port, log_level=args.log_level)
+    return 0
+
+
+def cmd_enroll(args: argparse.Namespace) -> int:
+    data_dir = _data_dir(args.data_dir)
+    _prepare(data_dir)
+    result = _enroll(args.portal, args.code, args.as_email)
+    if result == 0:
+        _say("Start it with `fluksio serve`; it dials the portal as it comes up.")
+    return result
+
+
+def cmd_worker(rest: list[str]) -> int:
+    from fluksio_worker.agent import main as worker_main
+
+    return worker_main(rest)
+
+
+def _parser() -> argparse.ArgumentParser:
+    parser = argparse.ArgumentParser(
+        prog="fluksio", description="Node-based automation: flows, dashboards, runs."
+    )
+    parser.add_argument("--version", action="version", version=fluksio.__version__)
+    subparsers = parser.add_subparsers(dest="command", required=True)
+
+    def with_data_dir(sub: argparse.ArgumentParser) -> None:
+        sub.add_argument(
+            "--data-dir",
+            default=os.environ.get("FLUKSIO_HOME"),
+            help=f"where this installation keeps everything (default {DEFAULT_HOME})",
+        )
+
+    serve = subparsers.add_parser("serve", help="run the engine")
+    with_data_dir(serve)
+    serve.add_argument("--host", default="127.0.0.1")
+    serve.add_argument("--port", type=int, default=8000)
+    serve.add_argument("--log-level", default="info")
+    serve.add_argument("--admin-email", default=None)
+    serve.add_argument("--admin-password", default=None)
+    serve.add_argument("--enroll", metavar="CODE", help="claim code, if not yet paired")
+    serve.add_argument("--portal", metavar="URL", help="the portal --enroll redeems at")
+    serve.set_defaults(func=cmd_serve)
+
+    enroll = subparsers.add_parser(
+        "enroll", help="pair this installation with a portal"
+    )
+    enroll.add_argument("code", help="the claim code minted on the portal")
+    enroll.add_argument("--portal", required=True, metavar="URL")
+    enroll.add_argument(
+        "--as",
+        dest="as_email",
+        default=None,
+        help="the local account a portal session arrives as",
+    )
+    with_data_dir(enroll)
+    enroll.set_defaults(func=cmd_enroll)
+
+    subparsers.add_parser(
+        "worker",
+        help="run nodes for an engine elsewhere (fluksio-worker)",
+        add_help=False,
+    )
+    return parser
+
+
+def main(argv: list[str] | None = None) -> int:
+    argv = list(sys.argv[1:] if argv is None else argv)
+    # Everything after `worker` belongs to the agent's own parser.
+    if argv and argv[0] == "worker":
+        return cmd_worker(argv[1:])
+    args = _parser().parse_args(argv)
+    result: int = args.func(args)
+    return result
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())

backend/fluksio/cloud/connector.py

@@ -27,8 +27,8 @@ from typing import Any
 import httpx
 from fastapi import FastAPI
 
+import fluksio
 from fluksio.cloud import config as cloud_config
-from fluksio.core.config import settings
 
 logger = logging.getLogger(__name__)
 
@@ -443,4 +443,4 @@ def _query_value(query: str, key: str) -> str:
 
 
 def _version() -> str:
-    return settings.VERSION if hasattr(settings, "VERSION") else "0.1.0"
+    return fluksio.__version__

backend/fluksio/cloud/enroll.py

@@ -0,0 +1,103 @@
+"""Redeeming a claim code, from the dashboard or from the command line.
+
+The work is the same either way — ask the portal, keep what it answers, and
+map the account that asked to the portal identity that owns the installation —
+so it lives here rather than in the route. The command line matters because a
+machine on a cluster has no browser pointed at it: `fluksio enroll` does this
+before the engine has started, holding nothing but the database.
+"""
+
+from __future__ import annotations
+
+from datetime import datetime, timezone
+from typing import Any
+
+import httpx
+from sqlmodel import Session, select
+
+import fluksio
+from fluksio.cloud import config as cloud_config
+from fluksio.models import User
+
+
+class EnrollError(Exception):
+    """A failure with the status the API should answer with."""
+
+    def __init__(self, status: int, detail: str) -> None:
+        super().__init__(detail)
+        self.status = status
+        self.detail = detail
+
+
+class AlreadyEnrolled(EnrollError):
+    def __init__(self) -> None:
+        super().__init__(409, "This installation is already connected to a portal")
+
+
+def redeem_claim(
+    portal_url: str, claim_code: str, *, timeout: float = 15.0
+) -> dict[str, Any]:
+    """Trade a claim code for this installation's credential and the portal's keys."""
+    base = portal_url.rstrip("/")
+    try:
+        response = httpx.post(
+            f"{base}/api/v1/enroll/",
+            json={"claim_code": claim_code, "app_version": fluksio.__version__},
+            timeout=timeout,
+        )
+    except httpx.HTTPError as exc:
+        raise EnrollError(502, f"Could not reach the portal: {exc}") from exc
+    if response.status_code == 404:
+        raise EnrollError(400, "That claim code is unknown or has expired")
+    if response.status_code != 200:
+        raise EnrollError(502, f"The portal refused the claim ({response.status_code})")
+
+    data: dict[str, Any] = response.json()
+    if not data.get("owner_id"):
+        # A portal older than remote users does not say who owns the
+        # installation, and without that the enrolling account cannot be mapped
+        # to anyone — which would leave the portal connected but refused here.
+        raise EnrollError(
+            502,
+            "That portal is too old for this installation: it did not say "
+            "which account owns the installation",
+        )
+    return data
+
+
+def enroll(
+    session: Session, user: User, portal_url: str, claim_code: str
+) -> cloud_config.CloudConfig:
+    """Redeem the code and write the config the connector dials with."""
+    if cloud_config.exists():
+        raise AlreadyEnrolled()
+
+    data = redeem_claim(portal_url, claim_code)
+    config = cloud_config.CloudConfig(
+        portal_url=portal_url.rstrip("/"),
+        ws_url=data["ws_url"],
+        installation_id=data["installation_id"],
+        token=data["installation_token"],
+        issuer=data["issuer"],
+        # Pinned here, at the one moment the claim code proves who we are
+        # talking to. Nothing refreshes this.
+        jwks=data["jwks"],
+        local_user_id=str(user.id),
+        enrolled_at=datetime.now(timezone.utc).isoformat(),
+        portal_account=user.email,
+    )
+    cloud_config.save(config)
+
+    owner_id = str(data["owner_id"])
+    # Re-enrolling from a different local account moves the mapping rather than
+    # leaving two accounts claiming the same portal identity, which the unique
+    # index would refuse and the lookup could not choose between anyway.
+    for other in session.exec(
+        select(User).where(User.portal_sub == owner_id, User.id != user.id)
+    ):
+        other.portal_sub = None
+        session.add(other)
+    user.portal_sub = owner_id
+    session.add(user)
+    session.commit()
+    return config

backend/fluksio/core/bootstrap.py

@@ -0,0 +1,64 @@
+"""First run: an account to sign in with.
+
+An installation started from the command line is given no environment, so the
+superuser a deployment sets in `.env` has to come from somewhere. The session
+key is the CLI's own business — it has to be set before this module can be
+imported at all.
+"""
+
+from __future__ import annotations
+
+import secrets
+
+from sqlmodel import Session, select
+
+from fluksio import crud
+from fluksio.models import User, UserCreate
+
+#: A generated admin's address. `example.com` is reserved for exactly this
+#: (RFC 2606) — `@localhost` and `.local` are too, and `EmailStr` refuses those.
+#: It is a name to sign in with, not somewhere mail is sent.
+DEFAULT_ADMIN = "admin@example.com"
+
+
+def ensure_superuser(
+    session: Session, *, email: str | None = None, password: str | None = None
+) -> tuple[User, str | None]:
+    """The account to sign in with, made on first run.
+
+    Returns the user and, when it was just created, the password in clear —
+    the caller prints it once. An installation that already has a superuser is
+    left alone: this is a first run, not a password reset.
+    """
+    existing = session.exec(
+        select(User).where(User.is_superuser == True)  # noqa: E712
+    ).first()
+    if existing is not None:
+        return existing, None
+
+    generated = password or secrets.token_urlsafe(12)
+    user = crud.create_user(
+        session=session,
+        user_create=UserCreate(
+            email=email or DEFAULT_ADMIN, password=generated, is_superuser=True
+        ),
+    )
+    return user, generated
+
+
+def pick_superuser(session: Session, email: str | None = None) -> User:
+    """The account an enrolment acts as; a portal session arrives as this one."""
+    if email:
+        user = session.exec(select(User).where(User.email == email)).first()
+        if user is None:
+            raise LookupError(f"No account here with the address {email}")
+        return user
+    users = session.exec(
+        select(User).where(User.is_superuser == True)  # noqa: E712
+    ).all()
+    if not users:
+        raise LookupError("This installation has no superuser to enrol as")
+    if len(users) > 1:
+        addresses = ", ".join(sorted(u.email for u in users))
+        raise LookupError(f"Several superusers here — name one with --as: {addresses}")
+    return users[0]

backend/fluksio/flow/modules.py

@@ -16,6 +16,7 @@ from __future__ import annotations
 import hashlib
 import importlib.metadata
 import logging
+import shutil
 import subprocess
 import sys
 import tempfile
@@ -37,11 +38,25 @@ VENV_DIR = settings.FLOWS_DIR.parent / "user-venv"
 SYNC_TIMEOUT = 300
 
 
+def uv_bin() -> str:
+    """Where ``uv`` is, without depending on what PATH happens to hold.
+
+    It is a dependency, so it is installed beside the interpreter running this
+    — which is what a systemd unit naming an absolute ExecStart, or a container
+    entrypoint, would otherwise miss.
+    """
+    beside = Path(sys.executable).with_name("uv")
+    if beside.exists():
+        return str(beside)
+    return shutil.which("uv") or "uv"
+
+
 def venv_python() -> str:
     """The interpreter node code runs on.
 
-    Falls back to the engine's own when there is no venv — a deployment without
-    ``uv`` still runs python nodes, it just cannot add packages to them.
+    Falls back to the engine's own when there is no venv — an installation that
+    could not build one still runs python nodes, it just cannot add packages
+    to them.
     """
     path = VENV_DIR / "bin" / "python"
     return str(path) if path.exists() else sys.executable
@@ -65,7 +80,7 @@ def ensure_venv() -> None:
     # inside another is how a user pin ends up resolving against app packages.
     subprocess.run(
         [
-            "uv",
+            uv_bin(),
             "venv",
             "--python",
             str(Path(sys.base_prefix, "bin", "python3")),
@@ -95,7 +110,7 @@ def sync(requirements: str) -> tuple[bool, str]:
             # Empty means empty: without the flag uv refuses to clear a venv,
             # so deleting the last line would leave the package installed.
             [
-                "uv",
+                uv_bin(),
                 "pip",
                 "sync",
                 "--allow-empty-requirements",

backend/fluksio/main.py

@@ -44,7 +44,8 @@ def custom_generate_unique_id(route: APIRoute) -> str:
 
 
 if settings.SENTRY_DSN and settings.ENVIRONMENT != "local":
-    sentry_sdk.init(dsn=str(settings.SENTRY_DSN), enable_tracing=True)
+    # `enable_tracing` was removed in sentry-sdk 2.x; this is what it meant.
+    sentry_sdk.init(dsn=str(settings.SENTRY_DSN), traces_sample_rate=1.0)
 
 
 def _state_backend() -> StateBackend:

backend/pyproject.toml

@@ -2,9 +2,7 @@
 name = "fluksio"
 version = "0.1.0"
 description = "Node-based automation engine: flows, dashboards, batch runs"
-# Capped below 3.14: the MCP SDK wants a newer starlette there than the
-# pinned sentry-sdk allows. Lift it when sentry-sdk moves to 2.x.
-requires-python = ">=3.10,<3.14"
+requires-python = ">=3.10"
 dependencies = [
     "fastapi[standard]<1.0.0,>=0.114.2",
     "python-multipart<1.0.0,>=0.0.7",
@@ -17,7 +15,7 @@ dependencies = [
     "httpx<1.0.0,>=0.25.1",
     "sqlmodel<1.0.0,>=0.0.21",
     "pydantic-settings<3.0.0,>=2.2.1",
-    "sentry-sdk[fastapi]<2.0.0,>=1.40.6",
+    "sentry-sdk[fastapi]>=2.20.0",
     "pyjwt<3.0.0,>=2.8.0",
     "pwdlib[argon2,bcrypt]>=0.3.0",
     "numpy>=2.2.6",
@@ -28,8 +26,15 @@ dependencies = [
     "croniter>=1.3.0",
     "mcp>=1.29,<2",
     "fluksio-worker>=0.1,<0.2",
+    # The Modules screen installs node code's packages with it, into a venv of
+    # the user's own. Present in the image; a pip install would otherwise have
+    # to find one on PATH, and quietly fall back to the engine's interpreter.
+    "uv>=0.5",
 ]
 
+[project.scripts]
+fluksio = "fluksio.cli:main"
+
 [tool.uv.sources]
 fluksio-worker = { workspace = true }
 
@@ -93,6 +98,11 @@ ignore = [
 ]
 
 [tool.ruff.lint.per-file-ignores]
+# The node API's stubs carry the real signatures and raise; unused arguments
+# are what a stub is.
+"fluksio/__init__.py" = ["ARG001"]
+# It talks to whoever ran it; that is what a command line is.
+"fluksio/cli.py" = ["T201"]
 # Node functions take `params` whether or not they use it — that is the
 # contract the engine calls them with.
 "fluksio/flow/nodes.py" = ["ARG001", "ARG002"]

backend/tests/test_cli.py

@@ -0,0 +1,36 @@
+"""The command line, and the one ordering it depends on."""
+
+import subprocess
+import sys
+from pathlib import Path
+
+from fluksio.cli import load_or_create_secret_key
+
+
+def test_importing_the_cli_does_not_build_the_settings() -> None:
+    """`_configure_environment` has to run before anything reads a setting.
+
+    The settings are built on the first import of `fluksio.core.config`, and
+    every engine module reaches it within an import or two. If importing the
+    CLI pulled it in, `DATA_DIR` would be fixed at whatever directory the
+    command was run from — which is how the database ends up in the cwd.
+    """
+    leaked = subprocess.run(
+        [
+            sys.executable,
+            "-c",
+            "import fluksio.cli, sys; print('fluksio.core.config' in sys.modules)",
+        ],
+        capture_output=True,
+        text=True,
+        check=True,
+    )
+    assert leaked.stdout.strip() == "False", leaked.stdout
+
+
+def test_the_secret_key_is_kept_rather_than_regenerated(tmp_path: Path) -> None:
+    """A new key each start would sign out every session and orphan secrets.enc."""
+    path = tmp_path / "secret_key"
+    first = load_or_create_secret_key(path)
+    assert load_or_create_secret_key(path) == first
+    assert path.stat().st_mode & 0o777 == 0o600

backend/tests/test_cloud.py

@@ -10,7 +10,7 @@ nothing, which is what makes deleting that local account a revocation.
 from __future__ import annotations
 
 import uuid
-from unittest.mock import AsyncMock, Mock, patch
+from unittest.mock import Mock, patch
 
 import jwt
 import pytest
@@ -206,9 +206,7 @@ def test_adding_a_remote_user_maps_and_revokes(
             return_value={"user_id": "portal-user-9", "email": "remote@example.com"}
         ),
     )
-    with patch(
-        "fluksio.api.routes.cloud.httpx.post", return_value=portal_reply
-    ) as post:
+    with patch("fluksio.cloud.enroll.httpx.post", return_value=portal_reply) as post:
         added = client.post(
             f"{settings.API_V1_STR}/cloud/users",
             headers=superuser_token_headers,
@@ -226,7 +224,7 @@ def test_adding_a_remote_user_maps_and_revokes(
     resolved = user_from_token(db, theirs)
     assert resolved is not None and resolved.email == "remote@example.com"
 
-    with patch("fluksio.api.routes.cloud.httpx.post", return_value=portal_reply):
+    with patch("fluksio.cloud.enroll.httpx.post", return_value=portal_reply):
         again = client.post(
             f"{settings.API_V1_STR}/cloud/users",
             headers=superuser_token_headers,
@@ -281,10 +279,7 @@ def test_enrolling_against_a_portal_without_an_owner_is_refused(
         ),
     )
     try:
-        with patch("fluksio.api.routes.cloud.httpx.AsyncClient") as client_cls:
-            client_cls.return_value.__aenter__.return_value.post = AsyncMock(
-                return_value=reply
-            )
+        with patch("fluksio.cloud.enroll.httpx.post", return_value=reply):
             response = client.post(
                 f"{settings.API_V1_STR}/cloud/enroll",
                 headers=superuser_token_headers,