US05-01: Validate Credentials and Upload Readiness

README.md

@@ -102,3 +102,37 @@ work_item/scripts/python -m pytest tests/e2e -m phase_c -q
 The deterministic naming provider is enabled only by test configuration
 (`PHOTO_PIPELINE_FAKE_NAMING_LOG`); without it the application falls back to the
 offline naming-policy name. Phase A and B suites remain green in the full run above.
+
+### Phase D acceptance gate
+
+Phase D (Epic E04: guarded renaming) is the first phase that changes the library on
+disk, so its gate is the strictest. One command runs the rename API journeys, the
+filesystem fault injection, and the browser suite:
+
+```bash
+work_item/scripts/python -m pytest tests/e2e -m phase_d -q
+```
+
+- `tests/e2e/test_phase_d_pipeline.py` drives a real server over HTTP: plan and
+  export, confirmation with the plan version and checksum (a stale token is refused
+  without touching disk), a valid apply, the case-only rename procedure, a collision
+  whose occupant survives, a source that changed after planning, and durability
+  across a full restart.
+- **Fault injection is real.** `PHOTO_PIPELINE_FAULT_AFTER=<journal state>` kills the
+  server process the instant that state is persisted. The suite crashes it at every
+  journal transition in turn (`moving`, `moved`, `database_updated`, `verified`),
+  starts a fresh process against the same database and library, and requires recovery
+  to converge from journal and disk evidence alone — with the asset set, the stable
+  IDs, and every content hash unchanged. Ambiguous evidence is never guessed: it stays
+  classified `manual` and keeps blocking. An unresolved rename is the cancellation
+  boundary — there is no cancel once a run starts, and unrelated mutations (album
+  proposal generation and approval) are refused with 409 `rename_recovery_required`
+  until it is resolved, while reads stay available.
+- `tests/e2e/test_renames_ui.py` covers the browser journeys: preview of every
+  affected path, confirmation carrying the server-issued token, apply with progress
+  and terminal verification, stale confirmation, collision, interruption, recovery,
+  rollback, keyboard confirmation, and the view still matching the journal after a
+  server restart.
+
+The fault barrier is test-only configuration; without `PHOTO_PIPELINE_FAULT_AFTER`
+the apply path has no crash points. Phases A–C remain green in the full run above.

photo_pipeline/api/app.py

@@ -25,6 +25,7 @@ from photo_pipeline.api.routes import (
     renames,
     safety,
     thumbnails,
+    uploads,
     workflow,
 )
 
@@ -67,6 +68,7 @@ def create_app(config: Config | None = None) -> FastAPI:
     app.include_router(library.router, prefix="/api/v1")
     app.include_router(albums.router, prefix="/api/v1")
     app.include_router(renames.router, prefix="/api/v1")
+    app.include_router(uploads.router, prefix="/api/v1")
     # Static single-page app (hash-routed). Mounted last so /api/v1 wins.
     if FRONTEND_DIR.is_dir():
         app.mount("/app", StaticFiles(directory=FRONTEND_DIR, html=True), name="app")

photo_pipeline/api/routes/uploads.py

@@ -0,0 +1,39 @@
+"""Upload preflight API (US05-01).
+
+Preflight is a command, not a resource read: it contacts the Immich server, hashes
+the current bytes, and issues a token. It uploads nothing — starting a batch is
+US05-02, so there is deliberately no start endpoint here.
+"""
+
+from __future__ import annotations
+
+from fastapi import APIRouter, Request
+from fastapi.responses import JSONResponse
+from pydantic import BaseModel
+
+from photo_pipeline.services.uploads import UploadError, UploadService
+
+router = APIRouter(tags=["uploads"])
+
+
+class PreflightRequest(BaseModel):
+    # ``None`` means every album; an explicit list scopes the check.
+    albums: list[str] | None = None
+    # Approving a partial upload is an explicit act, never a default.
+    allow_partial: bool = False
+
+
+def _service(request: Request) -> UploadService:
+    return UploadService(request.app.state.session_factory, config=request.app.state.config)
+
+
+@router.post("/upload-preflight")
+def preflight(request: Request, body: PreflightRequest | None = None):
+    body = body or PreflightRequest()
+    try:
+        return _service(request).preflight(body.albums, allow_partial=body.allow_partial)
+    except UploadError as error:
+        return JSONResponse(
+            status_code=422,
+            content={"error": {"code": "unknown_album", "message": str(error)}},
+        )

photo_pipeline/config.py

@@ -37,6 +37,8 @@ class Config(BaseModel):
 
     vision_api_key: SecretStr | None = None
     immich_api_key: SecretStr | None = None
+    immich_server_url: str = ""
+    immich_go_binary: str = "immich-go"
 
     @property
     def database_path(self) -> Path:

photo_pipeline/integrations/immich_go.py

@@ -0,0 +1,107 @@
+"""immich-go adapter: binary discovery, version, and redacted command preview.
+
+Upload is the only stage that needs credentials, so this module is also the single
+place that knows an API key exists. It never returns, logs, or renders the secret:
+:func:`build_command` produces the real argument list for the uploader, and
+:func:`redact` produces the copy that is safe for the API, the browser, and the
+activity log. Both come from the same builder so the preview can never drift from
+the command that would actually run.
+
+Server reachability uses ``/api/server/ping`` through stdlib ``urllib`` — the app
+has no HTTP client dependency and this is one request.
+"""
+
+from __future__ import annotations
+
+import json
+import shutil
+import subprocess
+import urllib.error
+import urllib.request
+from pathlib import Path
+
+REDACTED = "***"
+PING_PATH = "/api/server/ping"
+PING_TIMEOUT_SECONDS = 5.0
+
+
+def find_binary(binary: str = "immich-go") -> str | None:
+    """Absolute path of the uploader, or ``None`` when it is not installed."""
+    return shutil.which(binary)
+
+
+def version(binary: str = "immich-go") -> str | None:
+    """Reported uploader version, or ``None`` when it is missing or unusable.
+
+    The version is persisted with every batch (concept §8) because immich-go's
+    flags and report text change between releases.
+    """
+    path = find_binary(binary)
+    if path is None:
+        return None
+    try:
+        result = subprocess.run([path, "--version"], capture_output=True, text=True, timeout=30)
+    except (OSError, subprocess.SubprocessError):
+        return None
+    output = (result.stdout or result.stderr or "").strip()
+    return output.splitlines()[0].strip() if output else None
+
+
+def ping(server_url: str, *, timeout: float = PING_TIMEOUT_SECONDS) -> tuple[bool, str | None]:
+    """``(reachable, detail)`` for the configured Immich server.
+
+    A reachable Immich answers ``{"res": "pong"}``. Anything else — wrong host, no
+    Immich, HTTP error — is a blocker with a short human detail. The detail never
+    carries the URL's credentials because the key travels in a header, not the URL.
+    """
+    if not server_url:
+        return False, "no server URL configured"
+    url = server_url.rstrip("/") + PING_PATH
+    try:
+        with urllib.request.urlopen(url, timeout=timeout) as response:  # noqa: S310
+            payload = json.loads(response.read().decode("utf-8") or "{}")
+    except (urllib.error.URLError, OSError, ValueError, TimeoutError) as error:
+        return False, f"{type(error).__name__}: {error}"
+    if payload.get("res") == "pong":
+        return True, None
+    return False, "server did not answer with pong"
+
+
+def build_command(
+    *,
+    binary: str,
+    server_url: str,
+    api_key: str,
+    album_name: str,
+    folder: Path | str,
+) -> list[str]:
+    """The exact upload invocation for one folder-as-album batch."""
+    return [
+        binary,
+        "upload",
+        "from-folder",
+        f"--server={server_url}",
+        f"--api-key={api_key}",
+        f"--album-name={album_name}",
+        str(folder),
+    ]
+
+
+def redact(command: list[str]) -> list[str]:
+    """The same command with every secret-bearing argument masked."""
+    return [f"--api-key={REDACTED}" if arg.startswith("--api-key=") else arg for arg in command]
+
+
+def preview_command(
+    *, binary: str, server_url: str, album_name: str, folder: Path | str
+) -> list[str]:
+    """Redacted preview built without ever handling the real key."""
+    return redact(
+        build_command(
+            binary=binary,
+            server_url=server_url,
+            api_key=REDACTED,
+            album_name=album_name,
+            folder=folder,
+        )
+    )

photo_pipeline/services/uploads.py

@@ -0,0 +1,306 @@
+"""UploadService — preflight for Immich upload (US05-01).
+
+Upload is the first stage that sends the library somewhere the app cannot take it
+back from, so nothing here uploads: preflight only *proves* a scope is safe and
+issues a token that a later start command must present (US05-02).
+
+What it proves (concept §8 "preflight"):
+
+- credentials are configured and the Immich server answers, without ever putting
+  the API key in a response, a preview, or a log line;
+- ``immich-go`` is installed and its version is recorded;
+- no rename is half-applied — the journal must not block library mutation;
+- every asset in scope is canonical, present, and decided ``sfw``/``nsfw`` with a
+  verified safety EXIF checkpoint;
+- every SFW asset also has a completed analysis EXIF checkpoint;
+- the bytes on disk right now still hash to what inventory recorded, so the album
+  preview describes the exact bytes that would be uploaded.
+
+Blocker codes are structured, never prose the UI has to parse:
+
+``no_library_root``, ``credentials_missing``, ``server_unreachable``,
+``immich_go_missing``, ``rename_pending``, ``unknown_album``, ``empty_scope``,
+``file_missing``, ``bytes_changed``, ``safety_undecided``, ``safety_deferred``,
+``safety_exif_unverified``, ``analysis_incomplete``, ``partial_scope``.
+
+**Partial scope is a blocker, not a default.** An album with any blocked asset is
+refused unless the caller passes the explicit ``allow_partial`` policy, which is
+itself part of the token — a token issued for a partial upload can never be
+replayed as a full one.
+
+The token is derived, not stored: it is a digest of the whole report (minus its
+timestamp), so any change that matters — a new decision, edited bytes, a different
+server, a resolved blocker, a different policy — produces a different token and the
+old one is stale by construction. No table, no invalidation bookkeeping.
+"""
+
+from __future__ import annotations
+
+import hashlib
+import json
+from datetime import datetime, timezone
+from pathlib import Path
+
+from sqlalchemy import select
+from sqlalchemy.orm import sessionmaker
+
+from photo_pipeline.config import Config
+from photo_pipeline.integrations import immich_go
+from photo_pipeline.models import AnalysisResult, Asset, SafetyReview
+from photo_pipeline.services.albums import album_label
+from photo_pipeline.services.hashing import sha256_file
+from photo_pipeline.services.rename_journal import RenameJournal
+
+PREFLIGHT_VERSION = 1
+TOKEN_PREFIX = f"v{PREFLIGHT_VERSION}"
+SFW = "sfw"
+NSFW = "nsfw"
+ANALYZED = "analyzed"
+
+
+class UploadError(RuntimeError):
+    """Invalid preflight request (unknown album in the requested scope)."""
+
+
+def _now() -> datetime:
+    return datetime.now(timezone.utc)
+
+
+def _issue(code: str, message: str) -> dict:
+    return {"code": code, "message": message}
+
+
+class UploadService:
+    def __init__(self, session_factory: sessionmaker, *, config: Config) -> None:
+        self._session_factory = session_factory
+        self._config = config
+        self._roots = tuple(Path(root) for root in config.library_roots)
+
+    # ── preflight ─────────────────────────────────────────────────────────────
+
+    def preflight(self, albums: list[str] | None = None, *, allow_partial: bool = False) -> dict:
+        """Validate an upload scope and issue its token. Read-only, no upload."""
+        report = {
+            "schema_version": PREFLIGHT_VERSION,
+            "policy": {"allow_partial": allow_partial},
+            "blockers": [],
+            "credentials": self._credentials(),
+            "server": self._server(),
+            "uploader": self._uploader(),
+        }
+        report["blockers"] += self._environment_blockers(report)
+        report["albums"] = self._albums(albums, allow_partial=allow_partial)
+        report["totals"] = _totals(report["albums"])
+        if not report["albums"]:
+            report["blockers"].append(
+                _issue("empty_scope", "no canonical, active assets are in the selected scope")
+            )
+        report["state"] = (
+            "ready"
+            if not report["blockers"] and all(a["state"] == "ready" for a in report["albums"])
+            else "blocked"
+        )
+        report["token"] = _token(report)
+        report["generated_at"] = _now().isoformat()
+        return report
+
+    def verify_token(
+        self, token: str, albums: list[str] | None = None, *, allow_partial: bool = False
+    ) -> bool:
+        """True when ``token`` still describes the current state of that scope.
+
+        Recomputed rather than looked up, so an externally edited file or a changed
+        decision invalidates it even though nothing wrote to the database.
+        """
+        return bool(token) and token == self.preflight(albums, allow_partial=allow_partial)["token"]
+
+    # ── environment ───────────────────────────────────────────────────────────
+
+    def _credentials(self) -> dict:
+        """Presence only — the key itself never leaves configuration."""
+        return {
+            "server_url": self._config.immich_server_url,
+            "api_key_configured": self._config.immich_api_key is not None,
+        }
+
+    def _server(self) -> dict:
+        reachable, detail = immich_go.ping(self._config.immich_server_url)
+        return {"reachable": reachable, "detail": detail}
+
+    def _uploader(self) -> dict:
+        binary = self._config.immich_go_binary
+        return {
+            "binary": binary,
+            "installed": immich_go.find_binary(binary) is not None,
+            "version": immich_go.version(binary),
+        }
+
+    def _environment_blockers(self, report: dict) -> list[dict]:
+        blockers: list[dict] = []
+        if not self._roots:
+            blockers.append(_issue("no_library_root", "no library root is configured"))
+        if not report["credentials"]["api_key_configured"] or not self._config.immich_server_url:
+            blockers.append(
+                _issue("credentials_missing", "an Immich server URL and API key are required")
+            )
+        elif not report["server"]["reachable"]:
+            blockers.append(
+                _issue(
+                    "server_unreachable", f"Immich did not respond: {report['server']['detail']}"
+                )
+            )
+        if not report["uploader"]["installed"]:
+            blockers.append(
+                _issue("immich_go_missing", f"{self._config.immich_go_binary} is not installed")
+            )
+        if RenameJournal(self._session_factory).blocks_mutation():
+            blockers.append(
+                _issue("rename_pending", "an unresolved rename must be recovered before upload")
+            )
+        return blockers
+
+    # ── scope ─────────────────────────────────────────────────────────────────
+
+    def _albums(self, requested: list[str] | None, *, allow_partial: bool) -> list[dict]:
+        by_album = self._scope()
+        if requested is not None:
+            unknown = sorted(set(requested) - set(by_album))
+            if unknown:
+                raise UploadError(f"unknown album(s): {', '.join(unknown)}")
+            by_album = {name: by_album[name] for name in sorted(set(requested))}
+        return [
+            self._album(name, rows, allow_partial=allow_partial)
+            for name, rows in sorted(by_album.items())
+        ]
+
+    def _scope(self) -> dict[str, list[dict]]:
+        """Canonical, active assets grouped by album, each with its stage evidence."""
+        with self._session_factory() as session:
+            assets = list(
+                session.scalars(
+                    select(Asset).where(
+                        Asset.canonical_asset_id.is_(None),
+                        Asset.availability_state == "active",
+                        Asset.current_path.is_not(None),
+                    )
+                )
+            )
+            reviews: dict[str, SafetyReview] = {}
+            for review in session.scalars(select(SafetyReview).order_by(SafetyReview.created_at)):
+                reviews[review.asset_id] = review  # latest row per asset wins
+            analyses = {
+                result.asset_id: result for result in session.scalars(select(AnalysisResult))
+            }
+
+        by_album: dict[str, list[dict]] = {}
+        for asset in assets:
+            by_album.setdefault(album_label(asset.current_path, self._roots), []).append(
+                {
+                    "asset_id": asset.id,
+                    "path": asset.current_path,
+                    "expected_sha256": asset.current_sha256,
+                    "review": reviews.get(asset.id),
+                    "analysis": analyses.get(asset.id),
+                }
+            )
+        return by_album
+
+    def _album(self, name: str, rows: list[dict], *, allow_partial: bool) -> dict:
+        folder = Path(rows[0]["path"]).parent
+        items = sorted((self._item(row) for row in rows), key=lambda item: item["current_path"])
+        blocked = [item for item in items if item["blockers"]]
+        eligible = [item for item in items if not item["blockers"]]
+        blockers: list[dict] = []
+        if blocked and not allow_partial:
+            blockers.append(
+                _issue(
+                    "partial_scope",
+                    f"{len(blocked)} of {len(items)} asset(s) are not upload-ready; resolve them "
+                    "or approve a partial upload explicitly",
+                )
+            )
+        if not eligible:
+            blockers.append(_issue("empty_scope", "no upload-ready asset remains in this album"))
+        # Folder-as-album: Immich names the album after the leaf folder, so the
+        # preview shows exactly what the server will create.
+        album_name = folder.name
+        return {
+            "album": name,
+            "folder": str(folder),
+            "album_name": album_name,
+            "asset_count": len(items),
+            "eligible_count": len(eligible),
+            "blocked_count": len(blocked),
+            "partial": bool(blocked),
+            "state": "blocked" if blockers else "ready",
+            "blockers": blockers,
+            "assets": items,
+            "command_preview": immich_go.preview_command(
+                binary=self._config.immich_go_binary,
+                server_url=self._config.immich_server_url,
+                album_name=album_name,
+                folder=folder,
+            ),
+        }
+
+    def _item(self, row: dict) -> dict:
+        """One asset's readiness, including its hash *as it is on disk right now*."""
+        path = Path(row["path"])
+        review: SafetyReview | None = row["review"]
+        analysis: AnalysisResult | None = row["analysis"]
+        decision = review.decision if review else None
+        blockers: list[dict] = []
+        current_sha256 = None
+
+        if not path.exists():
+            blockers.append(_issue("file_missing", f"{path} is missing"))
+        else:
+            # ponytail: full re-hash every preflight. Gate on (size, mtime_ns) first
+            # if a large library makes this slow — the hash stays authoritative.
+            current_sha256 = sha256_file(path)
+            if row["expected_sha256"] and current_sha256 != row["expected_sha256"]:
+                blockers.append(
+                    _issue("bytes_changed", f"{path} changed since its last verified checkpoint")
+                )
+
+        if decision not in (SFW, NSFW):
+            code = "safety_deferred" if decision == "deferred" else "safety_undecided"
+            blockers.append(_issue(code, "a confirmed sfw/nsfw safety decision is required"))
+        elif review.exif_verified_at is None:
+            blockers.append(
+                _issue("safety_exif_unverified", "the safety EXIF checkpoint is not verified")
+            )
+        elif decision == SFW and not (
+            analysis and analysis.status == ANALYZED and analysis.exif_written_at is not None
+        ):
+            blockers.append(
+                _issue("analysis_incomplete", "SFW assets need a verified analysis EXIF checkpoint")
+            )
+
+        return {
+            "asset_id": row["asset_id"],
+            "current_path": str(path),
+            "safety_decision": decision,
+            "current_sha256": current_sha256,
+            "blockers": blockers,
+        }
+
+
+def _totals(albums: list[dict]) -> dict:
+    return {
+        "albums": len(albums),
+        "ready_albums": sum(1 for album in albums if album["state"] == "ready"),
+        "assets": sum(album["asset_count"] for album in albums),
+        "eligible": sum(album["eligible_count"] for album in albums),
+        "blocked": sum(album["blocked_count"] for album in albums),
+    }
+
+
+def _token(report: dict) -> str:
+    """Digest of everything the report asserts. Volatile fields are excluded so the
+    same state always yields the same token; every relevant change breaks it."""
+    payload = {key: value for key, value in report.items() if key not in ("generated_at", "token")}
+    digest = hashlib.sha256(
+        json.dumps(payload, sort_keys=True, ensure_ascii=False, default=str).encode("utf-8")
+    ).hexdigest()
+    return f"{TOKEN_PREFIX}:{digest}"

tests/e2e/_pipeline_harness.py

@@ -14,7 +14,9 @@ import socket
 import subprocess
 import sys
 import time
+import uuid
 from dataclasses import dataclass
+from datetime import datetime, timezone
 from pathlib import Path
 
 import httpx
@@ -159,3 +161,88 @@ def wait_until(predicate, *, timeout: float = 20, interval: float = 0.1):
             return value
         time.sleep(interval)
     raise AssertionError("condition not met before timeout")
+
+
+# ── Phase D: an analysed album, ready to be named and renamed ────────────────
+
+NOW = datetime(2026, 1, 1, tzinfo=timezone.utc)
+
+
+class session_factory:
+    """Session factory against a seeded database, for the few things a test has to
+    set up or inspect below the API — journal states, mainly."""
+
+    def __init__(self, seeded: Seeded) -> None:
+        self._seeded = seeded
+
+    def __enter__(self):
+        from photo_pipeline.config import Config
+        from photo_pipeline.db import create_db_engine, create_session_factory, run_migrations
+
+        config = Config.from_env(
+            {
+                "PHOTO_PIPELINE_DATA_DIR": str(self._seeded.data),
+                "PHOTO_PIPELINE_LIBRARY_ROOTS": str(self._seeded.lib),
+            }
+        )
+        run_migrations(config.database_url)
+        self._engine = create_db_engine(config.database_url)
+        return create_session_factory(self._engine)
+
+    def __exit__(self, *_):
+        self._engine.dispose()
+        return False
+
+
+def seed_album(tmp_path: Path, album: str = "rome", names: tuple[str, ...] = ("a.jpg", "b.jpg")):
+    """A library holding one album folder whose photos are confirmed SFW and analysed
+    — the state a naming proposal, and therefore a rename plan, is built from."""
+    from sqlalchemy import select
+
+    from photo_pipeline.models import AnalysisResult, Asset, SafetyReview
+    from photo_pipeline.services.inventory import InventoryService
+
+    seeded = seed_library(tmp_path, {}, {})
+    folder = seeded.lib / album
+    folder.mkdir(parents=True)
+    for index, name in enumerate(names):
+        image(folder / name, index + 1)
+
+    with session_factory(seeded) as sf:
+        InventoryService(sf).scan(seeded.lib)
+        with sf() as session:
+            rows = list(session.execute(select(Asset.id, Asset.current_path)).all())
+            for asset_id, path in rows:
+                session.add(
+                    SafetyReview(
+                        id=str(uuid.uuid4()), asset_id=asset_id, decision="sfw", created_at=NOW
+                    )
+                )
+                session.add(
+                    AnalysisResult(
+                        asset_id=asset_id,
+                        status="analyzed",
+                        description=f"a view of {path}",
+                        tags='["ruins", "city"]',
+                        approx_year=2019,
+                        location_hint="Rome",
+                    )
+                )
+            session.commit()
+        seeded.asset_ids.update({Path(path).stem: aid for aid, path in rows})
+    return seeded
+
+
+def approve_album(base: str, *, album: str = "rome", name: str) -> None:
+    """Generate a proposal, set its final name, and approve it over HTTP."""
+    httpx.post(f"{base}/api/v1/albums/proposals", json={}, timeout=10).raise_for_status()
+    for payload, route in (
+        ({"name": name}, "edit"),
+        ({}, "approve"),
+    ):
+        current = httpx.get(f"{base}/api/v1/albums/proposals/{album}", timeout=10).json()
+        httpx.post(
+            f"{base}/api/v1/albums/proposals/{album}/{route}",
+            json={**payload, "expected_version": current["version"]},
+            timeout=10,
+        ).raise_for_status()

tests/e2e/test_phase_d_pipeline.py

@@ -0,0 +1,377 @@
+"""Phase D end-to-end acceptance (US04-06): guarded renaming, black box.
+
+Every journey here drives a real ``photo_pipeline serve`` child process over HTTP —
+plan, export, confirm, apply, collide, go stale, crash, recover, roll back. The
+crashes are real: the server is killed by the ``PHOTO_PIPELINE_FAULT_AFTER`` barrier
+at each persisted journal transition in turn, then a fresh process is started against
+the same database and library and has to reconcile the wreckage from evidence alone.
+
+Photos really move. After every journey the assertions read the filesystem and the
+inventory back: the asset set, the stable IDs, and the content hashes must be exactly
+what they were before, only at new paths.
+"""
+
+from __future__ import annotations
+
+import httpx
+import pytest
+
+from tests.e2e._pipeline_harness import Server, approve_album, seed_album, session_factory
+
+pytestmark = pytest.mark.phase_d
+
+TIMEOUT = 10
+APPROVED = "2019 Rome"
+CRASH_POINTS = ["moving", "moved", "database_updated", "verified"]
+
+
+@pytest.fixture
+def server(tmp_path):
+    seeded = seed_album(tmp_path)
+    running = Server(seeded).start()
+    running.seeded = seeded
+    try:
+        yield running
+    finally:
+        running.stop()
+
+
+# ── helpers ──────────────────────────────────────────────────────────────────
+
+
+def _plan(base) -> dict:
+    response = httpx.post(f"{base}/api/v1/rename-plans", timeout=TIMEOUT)
+    response.raise_for_status()
+    return response.json()
+
+
+def _get_plan(base, plan_id) -> dict:
+    return httpx.get(f"{base}/api/v1/rename-plans/{plan_id}", timeout=TIMEOUT).json()
+
+
+def _apply(base, plan, **body):
+    payload = {"expected_version": plan["version"], **body}
+    return httpx.post(
+        f"{base}/api/v1/rename-plans/{plan['id']}/apply", json=payload, timeout=TIMEOUT
+    )
+
+
+def _inventory(base) -> dict[str, dict]:
+    """Every asset by stable ID, so identity can be compared across a rename."""
+    items = httpx.get(
+        f"{base}/api/v1/inventory/assets", params={"limit": 200}, timeout=TIMEOUT
+    ).json()["items"]
+    return {item["id"]: item for item in items}
+
+
+def _content(root) -> dict[str, bytes]:
+    return {
+        str(path.relative_to(root)): path.read_bytes()
+        for path in sorted(root.rglob("*"))
+        if path.is_file()
+    }
+
+
+def _recovery(base) -> dict:
+    return httpx.get(f"{base}/api/v1/rename-recovery", timeout=TIMEOUT).json()
+
+
+def _journal_states(seeded, plan_id) -> list[str]:
+    from photo_pipeline.services.rename_journal import RenameJournal
+
+    with session_factory(seeded) as sf:
+        return [row["journal_state"] for row in RenameJournal(sf).operations(plan_id)]
+
+
+# ── US04-01: plan and export ─────────────────────────────────────────────────
+
+
+def test_plan_and_export_describe_every_move_without_touching_the_library(server):
+    before = _content(server.seeded.lib)
+    approve_album(server.base, name=APPROVED)
+    plan = _plan(server.base)
+
+    assert plan["state"] == "validated" and plan["operation_count"] == 1
+    operation = plan["operations"][0]
+    assert operation["source_path"].endswith("/rome")
+    assert operation["destination_path"].endswith(f"/{APPROVED}")
+    assert operation["asset_count"] == 2
+    assert set(operation["asset_ids"]) == set(_inventory(server.base))
+
+    export = httpx.get(
+        f"{server.base}/api/v1/rename-plans/{plan['id']}/export", timeout=TIMEOUT
+    ).json()
+    assert export["schema_version"] == 1
+    assert export["checksum"] == plan["checksum"]
+    assert [op["source_path"] for op in export["operations"]] == [operation["source_path"]]
+    # Portable evidence must not smuggle out anything sensitive.
+    assert "token" not in str(export).lower() and "key" not in str(export).lower()
+
+    # Planning is a preview: not one byte moved.
+    assert _content(server.seeded.lib) == before
+
+
+# ── US04-03: confirmation and apply ──────────────────────────────────────────
+
+
+def test_apply_requires_the_current_confirmation_token(server):
+    approve_album(server.base, name=APPROVED)
+    plan = _plan(server.base)
+
+    stale = _apply(server.base, {**plan, "version": plan["version"] + 7})
+    assert stale.status_code == 409 and stale.json()["error"]["code"] == "version_conflict"
+
+    wrong_checksum = _apply(server.base, plan, expected_checksum="0" * 64)
+    assert wrong_checksum.status_code == 409
+
+    assert (server.seeded.lib / "rome").is_dir(), "a refused confirmation moves nothing"
+
+
+def test_a_valid_apply_preserves_ids_hashes_and_the_asset_set(server):
+    approve_album(server.base, name=APPROVED)
+    before = _inventory(server.base)
+    before_content = _content(server.seeded.lib)
+    plan = _plan(server.base)
+
+    applied = _apply(server.base, plan, expected_checksum=plan["checksum"]).json()
+    assert applied["applied"] == 1 and applied["failed"] == 0 and applied["state"] == "applied"
+
+    after = _inventory(server.base)
+    assert set(after) == set(before), "renaming must not change asset identity"
+    assert {item["current_sha256"] for item in after.values()} == {
+        item["current_sha256"] for item in before.values()
+    }
+    assert all(APPROVED in item["current_path"] for item in after.values())
+    # Same bytes, new folder — nothing was rewritten in the move.
+    assert _content(server.seeded.lib) == {
+        key.replace("rome/", f"{APPROVED}/"): value for key, value in before_content.items()
+    }
+    assert _journal_states(server.seeded, plan["id"]) == ["complete"]
+
+
+def test_a_case_only_rename_applies_on_a_case_insensitive_filesystem(tmp_path):
+    seeded = seed_album(tmp_path, album="rome")
+    running = Server(seeded).start()
+    try:
+        approve_album(running.base, name="Rome")
+        plan = _plan(running.base)
+        assert plan["operations"][0]["case_only"] is True
+
+        assert _apply(running.base, plan).json()["applied"] == 1
+        entries = {path.name for path in seeded.lib.iterdir()}
+        assert "Rome" in entries
+        # The staged intermediate name must not survive the procedure.
+        assert not any(name.startswith(".rename-") for name in entries)
+        assert all("/Rome/" in item["current_path"] for item in _inventory(running.base).values())
+    finally:
+        running.stop()
+
+
+def test_a_collision_is_refused_and_the_occupant_survives(server):
+    approve_album(server.base, name=APPROVED)
+    occupied = server.seeded.lib / APPROVED
+    occupied.mkdir()
+    (occupied / "precious.jpg").write_bytes(b"do not lose me")
+
+    plan = _plan(server.base)
+    assert plan["state"] == "invalid" and "destination_exists" in plan["blockers"]
+
+    refused = _apply(server.base, plan)
+    assert refused.status_code == 422 and refused.json()["error"]["code"] == "cannot_apply"
+    assert (occupied / "precious.jpg").read_bytes() == b"do not lose me"
+    assert (server.seeded.lib / "rome").is_dir()
+
+
+def test_a_source_that_changed_after_planning_is_refused(server):
+    approve_album(server.base, name=APPROVED)
+    plan = _plan(server.base)
+    # The plan recorded per-asset hashes; the file changes before confirmation.
+    (server.seeded.lib / "rome" / "a.jpg").write_bytes(b"tampered")
+
+    result = _apply(server.base, plan).json()
+    assert result["failed"] == 1 and result["applied"] == 0
+    assert (server.seeded.lib / "rome").is_dir(), "a failed precondition leaves the source alone"
+    operation = _get_plan(server.base, plan["id"])["operations"][0]
+    assert operation["journal_state"] == "failed"
+    assert operation["error_code"] == "source_changed"
+
+
+# ── US04-04: crash points, recovery, rollback ────────────────────────────────
+
+
+def _crash_during_apply(seeded, plan, state):
+    """Apply with the fault barrier armed: the server dies at ``state``, mid-move."""
+    crashing = Server(seeded, extra_env={"PHOTO_PIPELINE_FAULT_AFTER": state}).start()
+    try:
+        with pytest.raises(httpx.HTTPError):
+            _apply(crashing.base, plan)
+    finally:
+        crashing.stop()
+    assert crashing.proc is None
+
+
+@pytest.mark.parametrize("crash_point", CRASH_POINTS)
+def test_every_journal_crash_point_recovers_without_losing_content(tmp_path, crash_point):
+    seeded = seed_album(tmp_path)
+    first = Server(seeded).start()
+    try:
+        approve_album(first.base, name=APPROVED)
+        before = _inventory(first.base)
+        before_bytes = sorted(_content(seeded.lib).values())
+        plan = _plan(first.base)
+    finally:
+        first.stop()
+
+    _crash_during_apply(seeded, plan, crash_point)
+
+    # A brand-new process, no in-memory state: everything comes from the journal.
+    restarted = Server(seeded).start()
+    try:
+        recovery = _recovery(restarted.base)
+        assert recovery["items"], f"a crash at {crash_point} must leave visible evidence"
+        assert recovery["items"][0]["journal_state"] == crash_point
+        # Only a crash that could have left the library half-renamed blocks other
+        # work. `verified` is past every filesystem and database change — the move
+        # is done and checked, just not flagged complete — so it blocks nothing.
+        assert recovery["blocks_mutation"] is (crash_point != "verified")
+
+        resolved = httpx.post(
+            f"{restarted.base}/api/v1/rename-recovery/resolve", timeout=TIMEOUT
+        ).json()
+        assert resolved["manual"] == 0, "an interrupted rename must be decidable from evidence"
+
+        # Recovery is idempotent: running it again changes nothing.
+        assert _recovery(restarted.base)["blocks_mutation"] is False
+        httpx.post(f"{restarted.base}/api/v1/rename-recovery/resolve", timeout=TIMEOUT)
+
+        # A resumable crash is left ready to run again; finish it so every crash
+        # point converges on the same observable end state.
+        current = _get_plan(restarted.base, plan["id"])
+        if current["state"] != "applied":
+            _apply(restarted.base, current)
+
+        after = _inventory(restarted.base)
+        assert set(after) == set(before), "no asset may be lost or invented by a crash"
+        assert {item["current_sha256"] for item in after.values()} == {
+            item["current_sha256"] for item in before.values()
+        }
+        assert sorted(_content(seeded.lib).values()) == before_bytes
+        assert (seeded.lib / APPROVED).is_dir() and not (seeded.lib / "rome").exists()
+        assert all(APPROVED in item["current_path"] for item in after.values())
+        assert _journal_states(seeded, plan["id"]) == ["complete"]
+    finally:
+        restarted.stop()
+
+
+def test_ambiguous_evidence_is_kept_for_a_human_and_keeps_blocking(tmp_path):
+    seeded = seed_album(tmp_path)
+    first = Server(seeded).start()
+    try:
+        approve_album(first.base, name=APPROVED)
+        plan = _plan(first.base)
+    finally:
+        first.stop()
+
+    _crash_during_apply(seeded, plan, "moving")
+    # Someone creates the destination while the operation is unresolved: now both
+    # paths exist and nothing can tell which one holds the truth.
+    (seeded.lib / APPROVED).mkdir(exist_ok=True)
+
+    restarted = Server(seeded).start()
+    try:
+        assert _recovery(restarted.base)["items"][0]["classification"] == "manual"
+        resolved = httpx.post(
+            f"{restarted.base}/api/v1/rename-recovery/resolve", timeout=TIMEOUT
+        ).json()
+        assert resolved["manual"] == 1 and resolved["resumed"] == 0 and resolved["completed"] == 0
+        # Still blocking, and still nothing guessed.
+        assert _recovery(restarted.base)["blocks_mutation"] is True
+        assert (seeded.lib / "rome").is_dir()
+    finally:
+        restarted.stop()
+
+
+def test_an_unresolved_rename_is_the_cancellation_boundary(tmp_path):
+    """There is no cancel button once a rename starts. The boundary is that nothing
+    else may mutate the library until the interrupted work is resolved."""
+    seeded = seed_album(tmp_path)
+    first = Server(seeded).start()
+    try:
+        approve_album(first.base, name=APPROVED)
+        plan = _plan(first.base)
+    finally:
+        first.stop()
+
+    _crash_during_apply(seeded, plan, "moving")
+
+    restarted = Server(seeded).start()
+    try:
+        assert _recovery(restarted.base)["blocks_mutation"] is True
+
+        refused = httpx.post(f"{restarted.base}/api/v1/albums/proposals", json={}, timeout=TIMEOUT)
+        assert refused.status_code == 409
+        assert refused.json()["error"]["code"] == "rename_recovery_required"
+
+        # Reading stays available throughout — only mutation is paused.
+        assert httpx.get(f"{restarted.base}/api/v1/albums/evidence", timeout=TIMEOUT).status_code
+        assert len(_inventory(restarted.base)) == 2
+    finally:
+        restarted.stop()
+
+
+def test_rollback_returns_an_interrupted_move_to_its_source(tmp_path):
+    seeded = seed_album(tmp_path)
+    first = Server(seeded).start()
+    try:
+        approve_album(first.base, name=APPROVED)
+        before = _inventory(first.base)
+        plan = _plan(first.base)
+    finally:
+        first.stop()
+
+    # Crash after the content moved but before the database caught up: the operation
+    # is still reversible, which is exactly when rollback is defined.
+    _crash_during_apply(seeded, plan, "moved")
+
+    restarted = Server(seeded).start()
+    try:
+        rolled = httpx.post(
+            f"{restarted.base}/api/v1/rename-plans/{plan['id']}/rollback", timeout=TIMEOUT
+        ).json()
+        assert rolled["rolled_back"] == 1 and rolled["state"] == "rolled_back"
+
+        assert (seeded.lib / "rome" / "a.jpg").exists()
+        assert not (seeded.lib / APPROVED).exists()
+        after = _inventory(restarted.base)
+        assert set(after) == set(before)
+        assert all(item["current_path"].endswith(".jpg") for item in after.values())
+        assert _recovery(restarted.base)["blocks_mutation"] is False
+    finally:
+        restarted.stop()
+
+
+# ── durability ───────────────────────────────────────────────────────────────
+
+
+def test_the_applied_state_survives_a_full_restart(tmp_path):
+    seeded = seed_album(tmp_path)
+    first = Server(seeded).start()
+    try:
+        approve_album(first.base, name=APPROVED)
+        plan = _plan(first.base)
+        _apply(first.base, plan, expected_checksum=plan["checksum"]).raise_for_status()
+        expected = _inventory(first.base)
+    finally:
+        first.stop()
+
+    restarted = Server(seeded).start()
+    try:
+        assert _inventory(restarted.base) == expected
+        after = _get_plan(restarted.base, plan["id"])
+        assert after["state"] == "applied"
+        assert after["checksum"] == plan["checksum"], "the plan's evidence is immutable"
+        assert [op["journal_state"] for op in after["operations"]] == ["complete"]
+        assert all(op["verified_at"] for op in after["operations"])
+        assert _recovery(restarted.base) == {"blocks_mutation": False, "items": []}
+    finally:
+        restarted.stop()

tests/e2e/test_renames_ui.py

@@ -11,89 +11,22 @@ Renames really happen here: the assertions read the filesystem afterwards.
 
 from __future__ import annotations
 
-import uuid
-from datetime import datetime, timezone
-
 import httpx
 import pytest
 from playwright.sync_api import expect
 
-from tests.e2e._pipeline_harness import Server, image, seed_library
+from tests.e2e._pipeline_harness import Server, approve_album, seed_album, session_factory
 
 # Part of the Phase D acceptance command (US04-06); mapped to US04-05 for traceability.
 pytestmark = pytest.mark.phase_d
 
-NOW = datetime(2026, 1, 1, tzinfo=timezone.utc)
 TIMEOUT = 10
 APPROVED = "2019 Rome"
 
 
-def _seed(tmp_path):
-    """A library with one album ("rome") whose two photos are SFW and analysed."""
-    seeded = seed_library(tmp_path, {}, {})
-    album = seeded.lib / "rome"
-    album.mkdir()
-    image(album / "a.jpg", 1)
-    image(album / "b.jpg", 2)
-
-    from sqlalchemy import select
-
-    from photo_pipeline.models import AnalysisResult, Asset, SafetyReview
-    from photo_pipeline.services.inventory import InventoryService
-
-    with _factory(seeded) as sf:
-        InventoryService(sf).scan(seeded.lib)
-        with sf() as session:
-            rows = list(session.execute(select(Asset.id, Asset.current_path)).all())
-            for asset_id, path in rows:
-                session.add(
-                    SafetyReview(
-                        id=str(uuid.uuid4()), asset_id=asset_id, decision="sfw", created_at=NOW
-                    )
-                )
-                session.add(
-                    AnalysisResult(
-                        asset_id=asset_id,
-                        status="analyzed",
-                        description=f"a view of {path}",
-                        tags='["ruins", "city"]',
-                        approx_year=2019,
-                        location_hint="Rome",
-                    )
-                )
-            session.commit()
-    return seeded
-
-
-class _factory:
-    """Session factory against the seeded database, for the few things a test has to
-    set up or inspect below the API (journal states, mainly)."""
-
-    def __init__(self, seeded):
-        self._seeded = seeded
-
-    def __enter__(self):
-        from photo_pipeline.config import Config
-        from photo_pipeline.db import create_db_engine, create_session_factory, run_migrations
-
-        config = Config.from_env(
-            {
-                "PHOTO_PIPELINE_DATA_DIR": str(self._seeded.data),
-                "PHOTO_PIPELINE_LIBRARY_ROOTS": str(self._seeded.lib),
-            }
-        )
-        run_migrations(config.database_url)
-        self._engine = create_db_engine(config.database_url)
-        return create_session_factory(self._engine)
-
-    def __exit__(self, *_):
-        self._engine.dispose()
-        return False
-
-
 @pytest.fixture
 def server(tmp_path):
-    seeded = _seed(tmp_path)
+    seeded = seed_album(tmp_path)
     running = Server(seeded).start()
     running.seeded = seeded
     try:
@@ -105,22 +38,8 @@ def server(tmp_path):
 # ── helpers ──────────────────────────────────────────────────────────────────
 
 
-def _approve(base, *, album="rome", name=APPROVED):
-    """Generate a proposal, set its final name, and approve it — the state a rename
-    plan is built from."""
-    httpx.post(f"{base}/api/v1/albums/proposals", json={}, timeout=TIMEOUT).raise_for_status()
-    current = httpx.get(f"{base}/api/v1/albums/proposals/{album}", timeout=TIMEOUT).json()
-    httpx.post(
-        f"{base}/api/v1/albums/proposals/{album}/edit",
-        json={"name": name, "expected_version": current["version"]},
-        timeout=TIMEOUT,
-    ).raise_for_status()
-    current = httpx.get(f"{base}/api/v1/albums/proposals/{album}", timeout=TIMEOUT).json()
-    httpx.post(
-        f"{base}/api/v1/albums/proposals/{album}/approve",
-        json={"expected_version": current["version"]},
-        timeout=TIMEOUT,
-    ).raise_for_status()
+def _approve(base, *, name=APPROVED):
+    approve_album(base, name=name)
 
 
 def _build(base):
@@ -145,7 +64,7 @@ def _interrupt(seeded, plan, *, state="moving", make_destination=False):
     """
     from photo_pipeline.services.rename_journal import RenameJournal
 
-    with _factory(seeded) as sf:
+    with session_factory(seeded) as sf:
         journal = RenameJournal(sf)
         operation = journal.operations(plan["id"])[0]
         journal.begin(operation["id"], worker_id="crashed", fencing_token=1)
@@ -263,6 +182,22 @@ def test_the_applied_plan_survives_a_reload(page, server):
     expect(page.get_by_test_id("apply-result")).to_have_count(0)
 
 
+def test_the_view_matches_the_journal_after_a_server_restart(page, server):
+    _open_plan(page, server)
+    page.get_by_test_id("apply-plan").click()
+    expect(page.get_by_test_id("plan-state")).to_have_text("applied")
+
+    server.stop()
+    server.start()  # same port, so the page reconnects to a genuinely fresh process
+
+    page.reload()
+    expect(page.get_by_test_id("plan-state")).to_have_text("applied")
+    expect(page.get_by_test_id("operation-row").first.get_by_test_id("op-state")).to_have_text(
+        "complete"
+    )
+    expect(page.get_by_test_id("op-verified")).to_be_visible()
+
+
 def test_apply_can_be_confirmed_from_the_keyboard(page, server):
     _open_plan(page, server)
     page.get_by_test_id("apply-plan").focus()
@@ -287,7 +222,7 @@ def test_rollback_returns_an_unfinished_move_to_its_source(page, server):
     # the destination and the operation is still reversible.
     _interrupt(server.seeded, plan, state="moving")
     (server.seeded.lib / "rome").rename(server.seeded.lib / APPROVED)
-    with _factory(server.seeded) as sf:
+    with session_factory(server.seeded) as sf:
         from photo_pipeline.services.rename_journal import RenameJournal
 
         journal = RenameJournal(sf)

tests/e2e/test_traceability.py

@@ -12,12 +12,19 @@ from pathlib import Path
 REPO = Path(__file__).resolve().parents[2]
 MAP = json.loads((REPO / "tests" / "story_traceability.json").read_text())["stories"]
 PHASE_A_STORIES = {f"US01-0{n}" for n in range(1, 8)}
+PHASE_D_STORIES = {f"US04-0{n}" for n in range(1, 7)}
 
 
 def test_all_phase_a_stories_are_mapped():
     assert PHASE_A_STORIES <= set(MAP)
 
 
+def test_all_phase_d_stories_are_mapped():
+    """US04-06 acceptance: every guarded-rename story, plan through browser, is tied
+    to automated tests — renaming is the first thing that mutates the real library."""
+    assert PHASE_D_STORIES <= set(MAP)
+
+
 def test_every_mapped_test_file_exists_and_is_nonempty():
     for story, files in MAP.items():
         assert files, f"{story} maps to no tests"

tests/integration/test_upload_preflight.py

@@ -0,0 +1,511 @@
+"""Upload preflight: credentials, scope, readiness, and tokens (US05-01).
+
+Every external boundary is faked but never mocked away: the uploader is a real
+executable on disk invoked through ``subprocess``, and the Immich server is a real
+localhost HTTP server answering ``/api/server/ping``. Preflight itself must stay
+read-only — the library snapshot is asserted unchanged.
+"""
+
+import json
+import stat
+import threading
+import uuid
+from datetime import datetime, timezone
+from http.server import BaseHTTPRequestHandler, HTTPServer
+
+import pytest
+from fastapi.testclient import TestClient
+
+from photo_pipeline.api.app import create_app
+from photo_pipeline.config import Config
+from photo_pipeline.db import create_db_engine, create_session_factory, run_migrations
+from photo_pipeline.models import (
+    AnalysisResult,
+    Asset,
+    RenameOperation,
+    RenamePlan,
+    SafetyReview,
+)
+from photo_pipeline.services.hashing import sha256_file
+from photo_pipeline.services.uploads import UploadError, UploadService
+
+NOW = datetime(2026, 1, 1, tzinfo=timezone.utc)
+# A sentinel credential: every assertion below proves it never leaves configuration.
+SENTINEL_KEY = "immich-sentinel-9f3a2b"
+UPLOADER_VERSION = "immich-go 0.21.0"
+
+
+# ── fake external boundary ───────────────────────────────────────────────────
+
+
+class _PingHandler(BaseHTTPRequestHandler):
+    payload = b'{"res":"pong"}'
+    status = 200
+
+    def do_GET(self):  # noqa: N802 (BaseHTTPRequestHandler API)
+        self.send_response(type(self).status)
+        self.send_header("Content-Type", "application/json")
+        self.end_headers()
+        self.wfile.write(type(self).payload)
+
+    def log_message(self, *args):
+        pass  # keep the test output clean
+
+
+@pytest.fixture
+def immich_server():
+    """A real HTTP server that answers like Immich. Yields its base URL."""
+    handler = type("Handler", (_PingHandler,), {})
+    server = HTTPServer(("127.0.0.1", 0), handler)
+    thread = threading.Thread(target=server.serve_forever, daemon=True)
+    thread.start()
+    yield f"http://127.0.0.1:{server.server_port}", handler
+    server.shutdown()
+    server.server_close()
+
+
+def _fake_uploader(tmp_path):
+    """A real executable standing in for immich-go."""
+    path = tmp_path / "immich-go"
+    path.write_text(f"#!/bin/sh\necho '{UPLOADER_VERSION}'\n")
+    path.chmod(path.stat().st_mode | stat.S_IEXEC | stat.S_IXGRP | stat.S_IXOTH)
+    return path
+
+
+# ── environment ──────────────────────────────────────────────────────────────
+
+
+def _env(tmp_path, server_url, *, credential=SENTINEL_KEY, uploader=None):
+    (tmp_path / "data").mkdir(exist_ok=True)
+    lib = tmp_path / "lib"
+    lib.mkdir(exist_ok=True)
+    env = {
+        "PHOTO_PIPELINE_DATA_DIR": str(tmp_path / "data"),
+        "PHOTO_PIPELINE_LIBRARY_ROOTS": str(lib),
+        "PHOTO_PIPELINE_IMMICH_SERVER_URL": server_url,
+        "PHOTO_PIPELINE_IMMICH_GO_BINARY": str(
+            uploader if uploader is not None else _fake_uploader(tmp_path)
+        ),
+    }
+    if credential:
+        env["PHOTO_PIPELINE_IMMICH_API_KEY"] = credential
+    config = Config.from_env(env)
+    run_migrations(config.database_url)
+    return config, create_session_factory(create_db_engine(config.database_url)), lib
+
+
+def _album(
+    sf,
+    lib,
+    album="rome",
+    names=("a.jpg", "b.jpg"),
+    *,
+    decision="sfw",
+    exif_verified=True,
+    analyzed=True,
+):
+    """A real album folder with registered, stage-complete assets."""
+    folder = lib / album
+    folder.mkdir(parents=True, exist_ok=True)
+    ids = []
+    with sf() as session:
+        for name in names:
+            path = folder / name
+            path.write_bytes(name.encode() * 16)
+            asset_id = str(uuid.uuid4())
+            ids.append(asset_id)
+            session.add(
+                Asset(
+                    id=asset_id,
+                    original_path=str(path),
+                    current_path=str(path),
+                    discovered_at=NOW,
+                    hash_version=1,
+                    byte_size=path.stat().st_size,
+                    current_sha256=sha256_file(path),
+                )
+            )
+            if decision is not None:
+                session.add(
+                    SafetyReview(
+                        id=str(uuid.uuid4()),
+                        asset_id=asset_id,
+                        decision=decision,
+                        exif_verified_at=NOW if exif_verified else None,
+                    )
+                )
+            if analyzed:
+                session.add(
+                    AnalysisResult(
+                        asset_id=asset_id,
+                        status="analyzed",
+                        exif_written_at=NOW,
+                    )
+                )
+        session.commit()
+    return folder, ids
+
+
+def _snapshot(lib):
+    return {
+        str(p.relative_to(lib)): (p.read_bytes() if p.is_file() else None)
+        for p in sorted(lib.rglob("*"))
+    }
+
+
+def _service(sf, config):
+    return UploadService(sf, config=config)
+
+
+def _codes(report):
+    return {issue["code"] for issue in report["blockers"]} | {
+        issue["code"] for album in report["albums"] for issue in album["blockers"]
+    } | {
+        issue["code"]
+        for album in report["albums"]
+        for asset in album["assets"]
+        for issue in asset["blockers"]
+    }
+
+
+# ── happy path ───────────────────────────────────────────────────────────────
+
+
+def test_ready_preflight_reports_scope_command_and_hashes(tmp_path, immich_server):
+    url, _ = immich_server
+    config, sf, lib = _env(tmp_path, url)
+    folder, ids = _album(sf, lib)
+    before = _snapshot(lib)
+
+    report = _service(sf, config).preflight()
+
+    assert report["state"] == "ready" and report["blockers"] == []
+    assert report["server"]["reachable"] is True
+    assert report["uploader"]["installed"] is True
+    assert report["uploader"]["version"] == UPLOADER_VERSION
+    assert report["credentials"]["api_key_configured"] is True
+    assert report["totals"] == {
+        "albums": 1,
+        "ready_albums": 1,
+        "assets": 2,
+        "eligible": 2,
+        "blocked": 0,
+    }
+    album = report["albums"][0]
+    assert album["album"] == "rome" and album["folder"] == str(folder)
+    assert album["album_name"] == "rome"  # folder-as-album
+    assert album["partial"] is False and album["state"] == "ready"
+    assert sorted(a["asset_id"] for a in album["assets"]) == sorted(ids)
+    # Hashes are of the bytes on disk right now, not a remembered value.
+    for asset in album["assets"]:
+        assert asset["current_sha256"] == sha256_file(asset["current_path"])
+    assert report["token"].startswith("v1:")
+    assert _snapshot(lib) == before, "preflight must not touch the library"
+
+
+def test_command_preview_shows_folder_and_album_without_the_key(tmp_path, immich_server):
+    url, _ = immich_server
+    config, sf, lib = _env(tmp_path, url)
+    folder, _ = _album(sf, lib)
+
+    preview = _service(sf, config).preflight()["albums"][0]["command_preview"]
+
+    assert f"--api-key={'***'}" in preview
+    assert "--album-name=rome" in preview
+    assert str(folder) in preview
+    assert SENTINEL_KEY not in " ".join(preview)
+
+
+def test_scoping_to_one_album_excludes_the_others(tmp_path, immich_server):
+    url, _ = immich_server
+    config, sf, lib = _env(tmp_path, url)
+    _album(sf, lib, "rome")
+    _album(sf, lib, "paris", names=("c.jpg",))
+
+    report = _service(sf, config).preflight(["paris"])
+
+    assert [album["album"] for album in report["albums"]] == ["paris"]
+    assert report["totals"]["assets"] == 1
+
+
+def test_unknown_album_in_scope_is_refused(tmp_path, immich_server):
+    url, _ = immich_server
+    config, sf, lib = _env(tmp_path, url)
+    _album(sf, lib, "rome")
+
+    with pytest.raises(UploadError):
+        _service(sf, config).preflight(["atlantis"])
+
+
+def test_empty_scope_is_a_blocker(tmp_path, immich_server):
+    url, _ = immich_server
+    config, sf, _ = _env(tmp_path, url)
+
+    report = _service(sf, config).preflight()
+
+    assert report["state"] == "blocked" and "empty_scope" in _codes(report)
+
+
+# ── credentials and environment ──────────────────────────────────────────────
+
+
+def test_missing_api_key_blocks_without_touching_the_server(tmp_path, immich_server):
+    url, _ = immich_server
+    config, sf, lib = _env(tmp_path, url, credential=None)
+    _album(sf, lib)
+
+    report = _service(sf, config).preflight()
+
+    assert report["state"] == "blocked"
+    assert "credentials_missing" in _codes(report)
+    assert report["credentials"]["api_key_configured"] is False
+
+
+def test_unreachable_server_blocks(tmp_path, immich_server):
+    url, _ = immich_server
+    config, sf, lib = _env(tmp_path, url.replace(url.rsplit(":", 1)[-1], "1"))
+    _album(sf, lib)
+
+    report = _service(sf, config).preflight()
+
+    assert "server_unreachable" in _codes(report)
+    assert report["server"]["reachable"] is False and report["server"]["detail"]
+
+
+def test_server_that_is_not_immich_blocks(tmp_path, immich_server):
+    url, handler = immich_server
+    handler.payload = b'{"error":"unauthorized"}'
+    handler.status = 401
+    config, sf, lib = _env(tmp_path, url)
+    _album(sf, lib)
+
+    assert "server_unreachable" in _codes(_service(sf, config).preflight())
+
+
+def test_missing_uploader_blocks(tmp_path, immich_server):
+    url, _ = immich_server
+    config, sf, lib = _env(tmp_path, url, uploader=tmp_path / "does-not-exist")
+    _album(sf, lib)
+
+    report = _service(sf, config).preflight()
+
+    assert "immich_go_missing" in _codes(report)
+    assert report["uploader"]["installed"] is False and report["uploader"]["version"] is None
+
+
+def test_half_applied_rename_blocks_upload(tmp_path, immich_server):
+    """Album paths must be final before upload: an operation that may have already
+    touched the disk blocks every other mutation until it is recovered (US04-04)."""
+    url, _ = immich_server
+    config, sf, lib = _env(tmp_path, url)
+    folder, _ = _album(sf, lib)
+    with sf() as session:
+        plan_id = str(uuid.uuid4())
+        session.add(RenamePlan(id=plan_id, state="applying", operation_count=1))
+        session.flush()
+        session.add(
+            RenameOperation(
+                id=str(uuid.uuid4()),
+                plan_id=plan_id,
+                sequence=0,
+                operation="move_folder",
+                source_path=str(folder),
+                destination_path=str(lib / "2019 Rome"),
+                journal_state="moving",
+            )
+        )
+        session.commit()
+
+    report = _service(sf, config).preflight()
+
+    assert report["state"] == "blocked" and "rename_pending" in _codes(report)
+
+
+def test_no_secret_appears_anywhere_in_the_report(tmp_path, immich_server):
+    url, _ = immich_server
+    config, sf, lib = _env(tmp_path, url)
+    _album(sf, lib)
+
+    report = _service(sf, config).preflight()
+
+    assert SENTINEL_KEY not in json.dumps(report, default=str)
+
+
+# ── stage readiness ──────────────────────────────────────────────────────────
+
+
+@pytest.mark.parametrize(
+    "kwargs,code",
+    [
+        ({"decision": None}, "safety_undecided"),
+        ({"decision": "deferred"}, "safety_deferred"),
+        ({"exif_verified": False}, "safety_exif_unverified"),
+        ({"analyzed": False}, "analysis_incomplete"),
+    ],
+)
+def test_blocked_stage_blocks_upload(tmp_path, immich_server, kwargs, code):
+    url, _ = immich_server
+    config, sf, lib = _env(tmp_path, url)
+    _album(sf, lib, **kwargs)
+
+    report = _service(sf, config).preflight()
+
+    assert report["state"] == "blocked"
+    assert code in _codes(report)
+    assert report["albums"][0]["eligible_count"] == 0
+
+
+def test_reviewed_nsfw_asset_is_upload_eligible_without_analysis(tmp_path, immich_server):
+    """NSFW never reaches the analyser, but a verified nsfw keyword makes it
+    uploadable (concept §8 eligibility table)."""
+    url, _ = immich_server
+    config, sf, lib = _env(tmp_path, url)
+    _album(sf, lib, decision="nsfw", analyzed=False)
+
+    report = _service(sf, config).preflight()
+
+    assert report["state"] == "ready"
+    assert report["albums"][0]["eligible_count"] == 2
+
+
+def test_changed_bytes_block_the_album(tmp_path, immich_server):
+    url, _ = immich_server
+    config, sf, lib = _env(tmp_path, url)
+    folder, _ = _album(sf, lib)
+    (folder / "a.jpg").write_bytes(b"edited after the checkpoint")
+
+    report = _service(sf, config).preflight()
+
+    assert "bytes_changed" in _codes(report)
+    assert report["albums"][0]["blocked_count"] == 1
+
+
+def test_missing_file_blocks_the_album(tmp_path, immich_server):
+    url, _ = immich_server
+    config, sf, lib = _env(tmp_path, url)
+    folder, _ = _album(sf, lib)
+    (folder / "a.jpg").unlink()
+
+    assert "file_missing" in _codes(_service(sf, config).preflight())
+
+
+# ── partial scope ────────────────────────────────────────────────────────────
+
+
+def test_partial_album_is_blocked_until_explicitly_approved(tmp_path, immich_server):
+    url, _ = immich_server
+    config, sf, lib = _env(tmp_path, url)
+    folder, _ = _album(sf, lib)
+    (folder / "a.jpg").write_bytes(b"changed")
+
+    blocked = _service(sf, config).preflight()
+    approved = _service(sf, config).preflight(allow_partial=True)
+
+    assert blocked["state"] == "blocked"
+    assert "partial_scope" in {issue["code"] for issue in blocked["albums"][0]["blockers"]}
+    assert approved["state"] == "ready"
+    assert approved["albums"][0]["partial"] is True
+    assert approved["albums"][0]["eligible_count"] == 1
+    # The approval is part of the token, so it can never be replayed as a full run.
+    assert approved["token"] != blocked["token"]
+
+
+def test_partial_approval_cannot_rescue_an_album_with_nothing_ready(tmp_path, immich_server):
+    url, _ = immich_server
+    config, sf, lib = _env(tmp_path, url)
+    _album(sf, lib, decision=None)
+
+    report = _service(sf, config).preflight(allow_partial=True)
+
+    assert report["state"] == "blocked"
+    assert "empty_scope" in {issue["code"] for issue in report["albums"][0]["blockers"]}
+
+
+# ── token ────────────────────────────────────────────────────────────────────
+
+
+def test_token_is_stable_while_nothing_relevant_changes(tmp_path, immich_server):
+    url, _ = immich_server
+    config, sf, lib = _env(tmp_path, url)
+    _album(sf, lib)
+    service = _service(sf, config)
+
+    first = service.preflight()["token"]
+
+    assert service.preflight()["token"] == first
+    assert service.verify_token(first) is True
+
+
+@pytest.mark.parametrize("scope", [None, ["rome"]])
+def test_edited_bytes_make_the_token_stale(tmp_path, immich_server, scope):
+    url, _ = immich_server
+    config, sf, lib = _env(tmp_path, url)
+    folder, _ = _album(sf, lib)
+    service = _service(sf, config)
+    token = service.preflight(scope)["token"]
+
+    (folder / "b.jpg").write_bytes(b"edited outside the app")
+
+    assert service.verify_token(token, scope) is False
+
+
+def test_changed_decision_makes_the_token_stale(tmp_path, immich_server):
+    url, _ = immich_server
+    config, sf, lib = _env(tmp_path, url)
+    _, ids = _album(sf, lib)
+    service = _service(sf, config)
+    token = service.preflight()["token"]
+
+    with sf() as session:
+        session.add(
+            SafetyReview(
+                id=str(uuid.uuid4()),
+                asset_id=ids[0],
+                decision="deferred",
+                created_at=datetime(2099, 1, 1, tzinfo=timezone.utc),  # the latest review wins
+            )
+        )
+        session.commit()
+
+    assert service.verify_token(token) is False
+
+
+def test_token_from_a_different_scope_is_rejected(tmp_path, immich_server):
+    url, _ = immich_server
+    config, sf, lib = _env(tmp_path, url)
+    _album(sf, lib, "rome")
+    _album(sf, lib, "paris", names=("c.jpg",))
+    service = _service(sf, config)
+
+    assert service.verify_token(service.preflight(["rome"])["token"], ["paris"]) is False
+    assert service.verify_token("v1:not-a-real-token") is False
+    assert service.verify_token("") is False
+
+
+# ── API surface ──────────────────────────────────────────────────────────────
+
+
+def test_api_preflight_returns_the_report_without_secrets(tmp_path, immich_server):
+    url, _ = immich_server
+    config, sf, lib = _env(tmp_path, url)
+    _album(sf, lib)
+
+    with TestClient(create_app(config)) as client:
+        response = client.post("/api/v1/upload-preflight", json={})
+
+    assert response.status_code == 200
+    body = response.json()
+    assert body["state"] == "ready" and body["token"].startswith("v1:")
+    assert SENTINEL_KEY not in response.text
+
+
+def test_api_rejects_an_unknown_album(tmp_path, immich_server):
+    url, _ = immich_server
+    config, sf, lib = _env(tmp_path, url)
+    _album(sf, lib)
+
+    with TestClient(create_app(config)) as client:
+        response = client.post("/api/v1/upload-preflight", json={"albums": ["atlantis"]})
+
+    assert response.status_code == 422
+    assert response.json()["error"]["code"] == "unknown_album"

tests/story_traceability.json

@@ -100,6 +100,12 @@
     ],
     "US04-05": [
       "tests/e2e/test_renames_ui.py"
+    ],
+    "US04-06": [
+      "tests/e2e/test_phase_d_pipeline.py"
+    ],
+    "US05-01": [
+      "tests/integration/test_upload_preflight.py"
     ]
   }
 }