diff --git a/tests/test_prune_storage_share_dumps.py b/tests/test_prune_storage_share_dumps.py
new file mode 100644
index 0000000..3397deb
--- /dev/null
+++ b/tests/test_prune_storage_share_dumps.py
@@ -0,0 +1,195 @@
+"""Synthetic tests for the list-first Storage Share dump pruning (no network, no credentials)."""
+
+import hashlib
+import importlib.util
+import io
+import json
+import urllib.error
+import urllib.parse
+from pathlib import Path
+
+import pytest
+
+ROOT = Path(__file__).resolve().parents[1]
+spec = importlib.util.spec_from_file_location(
+    "prune", ROOT / "tools/bootstrap-recovery/prune-storage-share-dumps.py"
+)
+m = importlib.util.module_from_spec(spec)
+spec.loader.exec_module(m)
+FOLDER = "r01-net-kingdom-pg"
+
+
+def names(days, prefix="net-kingdom-pg-privacyidea_db"):
+    return {f"{prefix}-202610{d:02d}T023000Z.dump.age": 1000 + d for d in days}
+
+
+class Response(io.BytesIO):
+    def __init__(self, status, url, body=b""):
+        super().__init__(body)
+        self.status, self.url = status, url
+
+    def __enter__(self):
+        return self
+
+    def __exit__(self, *a):
+        return False
+
+
+class Share:
+    def __init__(self, files, extra=()):
+        self.files, self.extra, self.deleted = dict(files), list(extra), []
+
+    def open(self, request, timeout):
+        url, method = request.full_url, request.get_method()
+        assert request.headers["Authorization"].startswith("Basic ")
+        if method == "PROPFIND":
+            rows = "".join(
+                f"<d:response><d:href>{m.BASE}{FOLDER}/{urllib.parse.quote(n)}</d:href><d:propstat><d:prop>"
+                f"<d:resourcetype/><d:getcontentlength>{s}</d:getcontentlength></d:prop>"
+                f"<d:status>HTTP/1.1 200 OK</d:status></d:propstat></d:response>"
+                for n, s in [*self.files.items(), *self.extra]
+            )
+            body = (
+                f'<d:multistatus xmlns:d="DAV:"><d:response><d:href>{m.BASE}{FOLDER}/</d:href></d:response>'
+                f"{rows}</d:multistatus>"
+            ).encode()
+            return Response(207, url, body)
+        name = urllib.parse.unquote(url.rsplit("/", 1)[1])
+        if method == "DELETE":
+            del self.files[name]
+            self.deleted.append(name)
+            return Response(204, url)
+        if method == "HEAD":
+            if name in self.files:
+                return Response(200, url)
+            raise urllib.error.HTTPError(url, 404, "Not Found", None, None)
+        raise AssertionError(method)
+
+
+def make_plan(tmp_path, share, *extra):
+    path = tmp_path / "plan.json"
+    assert (
+        m.main(
+            ["plan", "--folder", FOLDER, "--plan", str(path), *extra],
+            client=share,
+            secret="pw",
+        )
+        == 0
+    )
+    return path, hashlib.sha256(path.read_bytes()).hexdigest()
+
+
+def test_plan_keeps_newest_daily_and_weekly_per_database(tmp_path, capsys):
+    share = Share(
+        {**names(range(1, 29)), **names(range(1, 29), "net-kingdom-pg-other_db")}
+    )
+    path, _ = make_plan(tmp_path, share)
+    plan = json.loads(path.read_text())
+    for prefix in ("net-kingdom-pg-privacyidea_db", "net-kingdom-pg-other_db"):
+        kept = sorted(n for n in plan["keep"] if n.startswith(prefix + "-"))
+        assert (
+            f"{prefix}-20261028T023000Z.dump.age" in kept
+            and f"{prefix}-20261022T023000Z.dump.age" in kept
+        )
+        assert 7 <= len(kept) <= 11
+    assert not share.deleted and set(plan["keep"]) | set(plan["delete"]) == set(
+        share.files
+    )
+    assert "plan sha256" in capsys.readouterr().out
+
+
+def test_delete_needs_the_plan_hash_and_removes_only_planned_files(tmp_path):
+    share = Share(names(range(1, 29)))
+    path, digest = make_plan(tmp_path, share)
+    plan = json.loads(path.read_text())
+    assert (
+        m.main(
+            [
+                "delete",
+                "--plan",
+                str(path),
+                "--confirm",
+                "0" * 64,
+                "--receipt",
+                str(tmp_path / "r0.json"),
+            ],
+            client=share,
+            secret="pw",
+        )
+        == 1
+    )
+    assert not share.deleted
+    assert (
+        m.main(
+            [
+                "delete",
+                "--plan",
+                str(path),
+                "--confirm",
+                digest,
+                "--receipt",
+                str(tmp_path / "r.json"),
+            ],
+            client=share,
+            secret="pw",
+        )
+        == 0
+    )
+    assert sorted(share.deleted) == sorted(plan["delete"]) and set(share.files) == set(
+        plan["keep"]
+    )
+    receipt = json.loads((tmp_path / "r.json").read_text())
+    assert (
+        receipt["kept_all_present"]
+        and receipt["deleted"] == len(plan["delete"])
+        and "pw" not in json.dumps(receipt)
+    )
+
+
+def test_delete_refuses_when_the_folder_changed_since_the_plan(tmp_path):
+    share = Share(names(range(1, 29)))
+    path, digest = make_plan(tmp_path, share)
+    victim = min(json.loads(path.read_text())["delete"])
+    share.files[victim] += 1
+    assert (
+        m.main(
+            [
+                "delete",
+                "--plan",
+                str(path),
+                "--confirm",
+                digest,
+                "--receipt",
+                str(tmp_path / "r.json"),
+            ],
+            client=share,
+            secret="pw",
+        )
+        == 1
+    )
+    assert not share.deleted
+
+
+@pytest.mark.parametrize("folder", ["net-kingdom-identity", "openbao", "r01-x/..", ""])
+def test_only_r01_dump_folders_are_accepted(tmp_path, folder):
+    assert (
+        m.main(
+            ["plan", "--folder", folder, "--plan", str(tmp_path / "p.json")],
+            client=Share({}),
+            secret="pw",
+        )
+        == 1
+    )
+
+
+def test_unexpected_entries_stop_the_plan(tmp_path):
+    share = Share(names(range(1, 9)), extra=[("notes.txt", 5)])
+    assert (
+        m.main(
+            ["plan", "--folder", FOLDER, "--plan", str(tmp_path / "p.json")],
+            client=share,
+            secret="pw",
+        )
+        == 1
+    )
+    assert not (tmp_path / "p.json").exists()
diff --git a/tools/bootstrap-recovery/prune-storage-share-dumps.py b/tools/bootstrap-recovery/prune-storage-share-dumps.py
new file mode 100644
index 0000000..fdf2f13
--- /dev/null
+++ b/tools/bootstrap-recovery/prune-storage-share-dumps.py
@@ -0,0 +1,298 @@
+#!/usr/bin/env python3
+"""List-first pruning of one CNPG dump folder in the Storage Share Backup account.
+
+Founder-run emergency relief for a full Backup account (NK-WP-0055-T07 finding, 2026-10-29): the
+CNPG Option A dumps (`railiance-platform/tools/cmd/cnpg-option-a-backup`) prune only their local copy,
+so `railiance-backups/r01-*` folders grow without bound and the identity backup refuses on quota.
+Permanent remote retention belongs to railiance-platform; this tool only frees space once.
+
+  plan   --folder r01-net-kingdom-pg --plan ~/prune-plan.json [--keep-daily 7] [--keep-weekly 4]
+         read-only: lists the folder, keeps per database the newest N dumps, the newest dump of each of
+         the last W ISO weeks and always the newest one, writes the plan, prints its sha256.
+  delete --plan ~/prune-plan.json --confirm <plan sha256> --receipt ~/prune-receipt.json
+         re-lists, refuses unless every planned file is still there with its size and every kept file
+         still exists, deletes only the planned files and checks each is gone.
+
+The Backup app password is read at a hidden prompt. Only `r01-*` dump folders are accepted; the
+identity bundle and OpenBao folders are refused. No credential, URL or provider response is printed.
+"""
+
+from __future__ import annotations
+
+import argparse
+import base64
+import getpass
+import hashlib
+import json
+import os
+import re
+import sys
+import urllib.error
+import urllib.parse
+import urllib.request
+import warnings
+import xml.etree.ElementTree as ET
+from datetime import UTC, datetime
+from pathlib import Path
+
+HOST = "https://nx4069.your-storageshare.de"
+BASE = "/remote.php/dav/files/Backup/railiance-backups/"
+FOLDER = re.compile(r"r01-[a-z0-9-]{1,60}\Z")
+DUMP = re.compile(r"(?P<prefix>[a-z0-9_-]{1,120})-(?P<stamp>\d{8}T\d{6}Z)\.dump\.age\Z")
+LIMIT = 16 * 1024 * 1024
+
+
+class Refused(Exception):
+    pass
+
+
+class NoRedirect(urllib.request.HTTPRedirectHandler):
+    def redirect_request(self, *args, **kwargs):
+        raise Refused("redirect refused")
+
+
+def opener():
+    return urllib.request.build_opener(urllib.request.ProxyHandler({}), NoRedirect())
+
+
+def prompt():
+    if not sys.stdin.isatty() or not sys.stderr.isatty():
+        raise Refused("run in your own terminal")
+    with warnings.catch_warnings():
+        warnings.simplefilter("error", getpass.GetPassWarning)
+        secret = getpass.getpass("Storage Share Backup app password: ")
+    if not secret or any(c in secret for c in "\r\n\x00"):
+        raise Refused("empty or invalid password")
+    return secret
+
+
+def auth(secret):
+    return {
+        "Authorization": "Basic "
+        + base64.b64encode(("Backup:" + secret).encode()).decode(),
+        "Accept-Encoding": "identity",
+    }
+
+
+def folder_url(folder):
+    if not FOLDER.fullmatch(folder):
+        raise Refused("only r01-* dump folders are accepted")
+    return HOST + BASE + folder + "/"
+
+
+def listing(client, headers, folder):
+    url = folder_url(folder)
+    request = urllib.request.Request(
+        url,
+        method="PROPFIND",
+        headers=dict(headers, Depth="1", **{"Content-Type": "application/xml"}),
+        data=b'<d:propfind xmlns:d="DAV:"><d:prop><d:resourcetype/><d:getcontentlength/></d:prop></d:propfind>',
+    )
+    with client.open(request, timeout=60) as response:
+        if response.status != 207 or response.url != url:
+            raise Refused("listing refused")
+        raw = response.read(LIMIT + 1)
+    if len(raw) > LIMIT:
+        raise Refused("listing too large")
+    files = {}
+    for item in ET.fromstring(raw).findall("{DAV:}response"):
+        path = urllib.parse.unquote(
+            urllib.parse.urlsplit(item.findtext("{DAV:}href") or "").path
+        )
+        if not path.startswith(BASE + folder + "/"):
+            raise Refused("unexpected path in listing")
+        name = path[len(BASE + folder + "/") :].rstrip("/")
+        if not name:
+            continue
+        size = None
+        for row in item.findall("{DAV:}propstat"):
+            if " 200 " in (row.findtext("{DAV:}status") or ""):
+                if (
+                    row.find("{DAV:}prop/{DAV:}resourcetype/{DAV:}collection")
+                    is not None
+                ):
+                    raise Refused("unexpected subfolder")
+                size = row.findtext("{DAV:}prop/{DAV:}getcontentlength")
+        if not DUMP.fullmatch(name) or size is None or not size.isdigit():
+            raise Refused("unexpected entry in folder; nothing planned")
+        files[name] = int(size)
+    return files
+
+
+def select(files, keep_daily, keep_weekly):
+    keep, groups = set(), {}
+    for name in files:
+        match = DUMP.fullmatch(name)
+        groups.setdefault(match["prefix"], []).append((match["stamp"], name))
+    for entries in groups.values():
+        entries.sort(reverse=True)
+        keep.update(name for _, name in entries[: max(1, keep_daily)])
+        weeks = []
+        for stamp, name in entries:
+            week = datetime.strptime(stamp, "%Y%m%dT%H%M%SZ").isocalendar()[:2]
+            if week not in weeks:
+                weeks.append(week)
+                if len(weeks) <= keep_weekly:
+                    keep.add(name)
+    return sorted(keep), sorted(set(files) - keep)
+
+
+def summary(files, keep, delete):
+    groups = {}
+    for name in files:
+        prefix = DUMP.fullmatch(name)["prefix"]
+        g = groups.setdefault(
+            prefix,
+            {
+                "files": 0,
+                "bytes": 0,
+                "keep": 0,
+                "delete": 0,
+                "delete_bytes": 0,
+                "newest": None,
+                "newest_bytes": 0,
+                "oldest": None,
+            },
+        )
+        g["files"] += 1
+        g["bytes"] += files[name]
+        g["keep" if name in keep else "delete"] += 1
+        if name in delete:
+            g["delete_bytes"] += files[name]
+        stamp = DUMP.fullmatch(name)["stamp"]
+        if g["newest"] is None or stamp > g["newest"]:
+            g["newest"], g["newest_bytes"] = stamp, files[name]
+        if g["oldest"] is None or stamp < g["oldest"]:
+            g["oldest"] = stamp
+    return groups
+
+
+def gib(n):
+    return f"{n / 1024**3:.1f} GiB"
+
+
+def plan(args, client, secret):
+    files = listing(client, auth(secret), args.folder)
+    keep, delete = select(files, args.keep_daily, args.keep_weekly)
+    record = {
+        "schema": "netkingdom.storage-share-dump-prune-plan.v1",
+        "folder": args.folder,
+        "created_at": datetime.now(UTC).isoformat(),
+        "keep_daily": args.keep_daily,
+        "keep_weekly": args.keep_weekly,
+        "keep": {n: files[n] for n in keep},
+        "delete": {n: files[n] for n in delete},
+    }
+    raw = (json.dumps(record, indent=2, sort_keys=True) + "\n").encode()
+    fd = os.open(
+        Path(args.plan).expanduser(),
+        os.O_WRONLY | os.O_CREAT | os.O_EXCL | os.O_NOFOLLOW,
+        0o600,
+    )
+    with os.fdopen(fd, "wb") as out:
+        out.write(raw)
+    for prefix, g in sorted(summary(files, set(keep), set(delete)).items()):
+        print(
+            f"{prefix}: {g['files']} files, {gib(g['bytes'])}, {g['oldest']} .. {g['newest']} "
+            f"(newest {g['newest_bytes'] / 1024**2:.0f} MiB); keep {g['keep']}, delete {g['delete']} "
+            f"freeing {gib(g['delete_bytes'])}"
+        )
+    print(
+        f"total: keep {len(keep)}, delete {len(delete)} freeing {gib(sum(record['delete'].values()))}"
+    )
+    print(f"plan sha256: {hashlib.sha256(raw).hexdigest()}")
+    return 0
+
+
+def delete(args, client, secret):
+    raw = Path(args.plan).expanduser().read_bytes()
+    if hashlib.sha256(raw).hexdigest() != args.confirm:
+        raise Refused("plan sha256 does not match --confirm")
+    record = json.loads(raw)
+    if (
+        record.get("schema") != "netkingdom.storage-share-dump-prune-plan.v1"
+        or not record["keep"]
+    ):
+        raise Refused("not a prune plan, or it keeps nothing")
+    headers = auth(secret)
+    files = listing(client, headers, record["folder"])
+    if any(files.get(n) != size for n, size in record["delete"].items()):
+        raise Refused("a planned file changed or vanished; make a new plan")
+    if any(n not in files for n in record["keep"]):
+        raise Refused("a kept file is missing; make a new plan")
+    base = folder_url(record["folder"])
+    deleted, freed = [], 0
+    for name in sorted(record["delete"]):
+        url = base + urllib.parse.quote(name)
+        with client.open(
+            urllib.request.Request(url, method="DELETE", headers=headers), timeout=60
+        ) as response:
+            if response.status not in (200, 204):
+                raise Refused("delete refused")
+        try:
+            client.open(
+                urllib.request.Request(url, method="HEAD", headers=headers), timeout=30
+            )
+            raise Refused("file still present after delete")
+        except urllib.error.HTTPError as error:
+            if error.code != 404:
+                raise Refused("unexpected status after delete") from None
+        deleted.append(name)
+        freed += record["delete"][name]
+    remaining = listing(client, headers, record["folder"])
+    receipt = {
+        "schema": "netkingdom.storage-share-dump-prune.v1",
+        "folder": record["folder"],
+        "plan_sha256": args.confirm,
+        "finished_at": datetime.now(UTC).isoformat(),
+        "deleted": len(deleted),
+        "bytes_freed": freed,
+        "kept_all_present": all(n in remaining for n in record["keep"]),
+        "remaining_files": len(remaining),
+        "credential_recorded": False,
+    }
+    fd = os.open(
+        Path(args.receipt).expanduser(),
+        os.O_WRONLY | os.O_CREAT | os.O_EXCL | os.O_NOFOLLOW,
+        0o600,
+    )
+    with os.fdopen(fd, "w") as out:
+        out.write(json.dumps(receipt, indent=2, sort_keys=True) + "\n")
+    print(
+        f"deleted {len(deleted)} files, freed {gib(freed)}; kept files present: {receipt['kept_all_present']}"
+    )
+    return 0 if receipt["kept_all_present"] else 1
+
+
+def main(argv=None, client=None, secret=None):
+    parser = argparse.ArgumentParser(description=__doc__.splitlines()[0])
+    sub = parser.add_subparsers(dest="command", required=True)
+    p = sub.add_parser("plan")
+    p.add_argument("--folder", required=True)
+    p.add_argument("--plan", required=True)
+    p.add_argument("--keep-daily", type=int, default=7)
+    p.add_argument("--keep-weekly", type=int, default=4)
+    d = sub.add_parser("delete")
+    d.add_argument("--plan", required=True)
+    d.add_argument("--confirm", required=True)
+    d.add_argument("--receipt", required=True)
+    args = parser.parse_args(argv)
+    try:
+        if args.command == "plan":
+            folder_url(args.folder)
+            if args.keep_daily < 1 or args.keep_weekly < 0:
+                raise Refused("keep at least one daily dump")
+        return (plan if args.command == "plan" else delete)(
+            args, client or opener(), secret or prompt()
+        )
+    except Refused as error:
+        print(f"refused: {error}", file=sys.stderr)
+    except urllib.error.HTTPError as error:
+        print(f"refused: provider answered HTTP {error.code}", file=sys.stderr)
+    except (urllib.error.URLError, OSError, ET.ParseError):
+        print("refused: provider or local I/O failure", file=sys.stderr)
+    return 1
+
+
+if __name__ == "__main__":
+    sys.exit(main())