Merge pull request 'feature/m6-missions' (#3) from feature/m6-missions into main

Reviewed-on: #3

CHANGELOG.md

@@ -4,6 +4,48 @@ All notable changes to this project will be documented here. Format: [Keep a Cha
 
 ## [Unreleased]
 
+### Fixed (post-M6 SPA — mission detail page was read-only)
+- **Mission detail page couldn't edit metadata, append scenarios, or change members** (`frontend/src/pages/MissionDetailPage.tsx`): the M6 SPA shipped the 3-step *creation* wizard but no edit affordance on the detail page — even though the backend already exposed `PUT /missions/{id}`, `POST /missions/{id}/scenarios`, and `PUT /missions/{id}/members`. Added three modals gated by `is_admin || mission.update`:
+  - **Edit metadata** (header button, opens a 3xl modal): name / client_target / dates / description_md, full inline validation (empty name, inverted dates) mirroring the wizard's step 1.
+  - **Add scenarios** (in the Tests tab): scenario picker reusing the wizard step-2 visual, calls `POST /missions/{id}/scenarios` which appends snapshots at `current_max_position + 1`. The footer line tells the user how many tests will be appended.
+  - **Edit members** (in the Members tab): roster + red/blue toggles, calls `PUT /missions/{id}/members` (full-set replace) — same UX as the wizard step 3, pre-populated with the current member set.
+- Detail page now imports `useAuth` to compute `canEdit` once and reuses it across all three buttons.
+- E2E spec extended: new test `SPA — detail page edits metadata, appends scenarios, edits members` exercises the three modals end-to-end against a pre-seeded mission. Suite is now 44 Playwright tests (6 in M6).
+
+### Fixed (post-M6 review pass — spec-reviewer + code-reviewer)
+- **SPA cache invalidation only refreshed the empty-filter list** (`frontend/src/lib/missions.ts:136`): `missionKeys.list()` returns `['missions','list',{}]`. TanStack v5's `invalidateQueries({queryKey})` is prefix-based, but `{}` is treated as an atomic final element — so create / transition / delete called with that key only invalidated the *exact* empty-filter list, leaving any filtered variant stale until manual refetch. Added `missionKeys.listPrefix()` returning `['missions','list']` and switched all three mutation `onSuccess` paths to it.
+- **Snapshot lacked the per-scenario advisory lock** (`backend/app/services/missions.py:467`): a concurrent `PUT /scenario-templates/{id}/tests` (M5 reorder, which deletes-then-reinserts join rows) running while `_snapshot_scenarios` walked `sc.tests` could freeze a torn snapshot — `selectinload` re-queries under READ COMMITTED so a partial view was possible. Added `_lock_scenario_ids_for_snapshot` that acquires the same `pg_advisory_xact_lock` key used by `set_scenario_tests` (blake2b digest of the scenario UUID, sorted to avoid deadlocks). Snapshot and reorder now serialise per scenario.
+- **Transition endpoint leaked its body shape via 400 before the perm gate** (`backend/app/api/missions.py:441`): a user without `mission.update` or `mission.archive` POSTing `{"status":"x"}` got a Pydantic 400 instead of 403. Added `@require_perm("mission.update", "mission.archive")` so the gate fires before the parse; the inner refinement still enforces the per-target perm. Test `test_transition_perm_gate_runs_before_payload_parse`.
+- **LIKE wildcards in user-typed search were honoured as SQL wildcards** (`backend/app/services/missions.py:632,637`): `?q=%` matched every mission. Added `_escape_like` that pre-escapes `%`, `_`, `\` and a matching `escape='\\'` argument on every `.like(...)` call. Test `test_search_treats_wildcards_as_literals`.
+- **Counts ignored soft-deleted mission children** (`backend/app/services/missions.py:587,597`): `tests_count` and the detail view summed `len(sc.tests)` without filtering `MissionTest.deleted_at`. Harmless today (M6 doesn't soft-delete mission tests), but would drift silently once M7+ surfaces `state=skipped/blocked`. Added the filter in both `_to_list_item` and `_scenario_views`.
+- **`/users/roster` was unordered** (`backend/app/api/users.py:73`): the wizard's member list shuffled rows on every refetch. Sorted by `email` for predictable rendering + stable e2e selectors.
+- **Frontend transition button accent collapsed `in_progress` and `completed` into one colour** (`frontend/src/pages/MissionDetailPage.tsx:97`): both rendered cyan, so the status legend in the list didn't match the transition button. Added a `TRANSITION_BUTTON_ACCENT` map mirroring `MISSION_STATUS_ACCENT` (cyan/orange/green/teal).
+- **Soft-deleted source scenario was a silent foot-gun**: `_load_scenario_templates_for_snapshot` already rejected it, but no test pinned the behaviour. Added `test_create_mission_rejects_soft_deleted_scenario` so future refactors can't regress to "freeze a tombstoned scenario into a fresh mission".
+- **E2E wizard assertion used `getByRole('button', { name: /In Progress/i })`** (`e2e/tests/m6-missions.spec.ts:287`): the accessible name is `→ In Progress` and the arrow Unicode is brittle. Switched to `getByTestId('mission-transition-in_progress')`.
+
+### Added — M6 (Missions & snapshot)
+- **CRUD `missions`** (`app/services/missions.py` + `app/api/missions.py`):
+  - Fields: name, client_target, date_start, date_end, status (`draft/in_progress/completed/archived`), description (markdown), visibility_mode (frozen to `whitebox` in v1).
+  - On creation/append, the service **snapshots** the selected `scenario_templates` and all their `test_templates` into `mission_scenarios` / `mission_tests` (every template field — including OPSEC level, tags, expected IOCs, MITRE tags). The denormalised `mission_test_mitre_tags` table copies `external_id`, `name`, `url` so a later MITRE re-sync that drops the entry can't alter a mission's tags (spec §11).
+  - `source_*_template_id` FKs survive template soft-deletes (`ON DELETE SET NULL`); the mission's frozen content is unaffected.
+  - **Membership visibility**: non-admin viewers see only missions where they are a `mission_members` row. The service maps "not visible" → 404 (no existence leak via 403). Admins bypass via the `admin` group.
+  - **Status state machine**: `draft → in_progress → completed → archived`; `archived → ∅`. The transition endpoint accepts the target status, validates the move, and rejects invalid jumps with 409. Idempotent (target=current) is a no-op 200.
+  - Auto-creator-membership: a non-admin caller of `POST /missions` is auto-added as `role_hint='red'` if not already in the `members[]` payload — so they retain visibility on the mission they just created.
+  - REST: `GET/POST /missions`, `GET/PUT/DELETE /missions/{id}`, `POST /missions/{id}/scenarios` (append snapshots at the end), `PUT /missions/{id}/members` (replace set), `POST /missions/{id}/transition`.
+  - Filters on list: `q` (LIKE on name/description), `status`, `client` (LIKE on client_target). `include_deleted=true` is admin-only (403 otherwise).
+- **`GET /users/roster`** (`app/api/users.py`): a deliberately minimal listing — `id`, `email`, `display_name` of active users only — accessible to any holder of `user.read`, `mission.create`, or `mission.update`. Lets a non-admin red teamer populate the wizard's member picker without exposing the admin-grade `/users` endpoint (which leaks `is_admin`, `is_active`, group memberships).
+- **Frontend**:
+  - `lib/missions.ts` — typed client + queryKey factory + status accent map + filter query-string builder.
+  - `pages/MissionsListPage.tsx` — list cards (one per mission) with status accent, scenario/test/member counts, date range, plus filters (q, client, status).
+  - `pages/MissionsCreatePage.tsx` — **3-step wizard**: metadata → scenario picker → member roster (red/blue toggles + auto-include the non-admin creator). Submits via `POST /missions` and redirects to the detail page.
+  - `pages/MissionDetailPage.tsx` — header with transition buttons (only the legal next states are rendered), soft-delete with confirm prompt, and 4 tabs: **Tests** (table of snapshotted tests with MITRE tags, OPSEC, state), **Members** (role-coloured pills), **Synthesis** (placeholder for M10), **Export** (placeholder for M11).
+  - Nav adds **Missions** link visible to anyone with `mission.read` or admin.
+- **/diag/reset** truncates the mission tables before the template tables — `mission_scenarios.source_scenario_template_id` and `mission_tests.source_test_template_id` are `ON DELETE SET NULL`, so wiping missions first avoids the round-trip through the null-update path.
+- **Testing**:
+  - `backend/tests/test_missions.py` — **22 pytest** covering snapshot fidelity (rename source template after snapshot → mission unchanged), MITRE tag propagation, membership-based 404, perm gating (create vs read vs archive), status transition chain + invalid jumps (409), member set replace + role-hint validation, scenario append at correct position, soft-delete, partial metadata update, inverted-date rejection, admin-only `include_deleted`.
+  - `e2e/tests/m6-missions.spec.ts` — **5 Playwright** (snapshot freezing, membership visibility for non-admin red, status transition + 409, SPA wizard end-to-end, SPA list + status filter).
+  - `tasks/testing-m6.md`.
+
 ### Added — M5 (Test & scenario templates)
 - **CRUD `test_templates`** (`app/services/test_templates.py` + `app/api/test_templates.py`):
   - Fields: name, description, objective, procedure (markdown), prerequisites (markdown), expected result red, expected detection blue, OPSEC level (`low/medium/high`), free tags (TEXT[]), expected IOCs (TEXT[]).

README.md

@@ -12,6 +12,7 @@ Collaborative purple-team platform. Red team logs the tests they execute (proced
 - **RBAC (M3+)**: atomic permissions (31 codes) bundled into custom groups; 3 system groups seeded (`admin` / `redteam` / `blueteam`).
 - **MITRE ATT&CK (M4+)**: Enterprise reference catalogue pinned to v19.0, seedable via `make seed-mitre`.
 - **Template catalogue (M5+)**: reusable `test_templates` (markdown procedure, OPSEC level, free tags, expected IOCs, MITRE tags) + ordered `scenario_templates` with drag-and-drop reordering. Admin pages at `/admin/tests` and `/admin/scenarios`.
+- **Missions (M6+)**: `missions` snapshot one or more scenario templates at creation time; template edits don't drift live missions (`mission_*` tables freeze every field, including MITRE tags). Non-admin members see only their own missions (membership filter, 404 on existence-leak attempts). Status state machine `draft → in_progress → completed → archived`, archive perm gated separately. SPA: list/filter at `/missions`, 3-step create wizard at `/missions/new`, detail page with Tests / Members / Synthesis / Export tabs.
 - **Delivery**: docker-compose. TLS termination is expected to be handled by an external reverse proxy in production.
 
 ## Quickstart
@@ -94,7 +95,7 @@ See `.env.example`. The most important ones:
 
 ## Testing
 
-- **Manual + automated checklist for the current milestone**: see [`tasks/testing-m<N>.md`](tasks/testing-m4.md) (current: `testing-m4.md`).
+- **Manual + automated checklist for the current milestone**: see [`tasks/testing-m<N>.md`](tasks/testing-m6.md) (current: `testing-m6.md`).
 - **Backend unit tests**: `make test-api`
 - **End-to-end (Playwright)**: `make e2e-install` (once), then `make up && make e2e`. Reports land in `e2e/playwright-report/` (HTML + JUnit XML); open with `make e2e-report`.
 
@@ -136,7 +137,7 @@ The hooks run `ruff` + `ruff-format` on the backend and `eslint` / `tsc --noEmit
 
 ## Roadmap
 
-See `tasks/todo.md`. Current milestone: **M4 — MITRE ATT&CK Enterprise**. Next: M5 (test & scenario templates).
+See `tasks/todo.md`. Current milestone: **M6 — Missions & snapshot** (done). Next: M7 (red/blue execution on a mission test).
 
 ## License
 

backend/app/api/diag.py

@@ -73,6 +73,20 @@ def reset_test_state():
                     "user_groups, settings, groups RESTART IDENTITY CASCADE"
                 )
             )
+            # Mission catalogue reset (M6). Truncated before the template tables
+            # below because `mission_scenarios.source_scenario_template_id` and
+            # `mission_tests.source_test_template_id` are ON DELETE SET NULL — a
+            # cascade-truncate of templates would attempt to null those columns
+            # and stall on the constraint check. Wiping the mission tables first
+            # avoids that round-trip; cascades from `missions` then take care of
+            # members, scenarios, tests, mitre_tags, categories.
+            conn.execute(
+                text(
+                    "TRUNCATE mission_test_mitre_tags, mission_tests, "
+                    "mission_scenarios, mission_categories, mission_members, "
+                    "missions RESTART IDENTITY CASCADE"
+                )
+            )
             # Template catalogue reset (M5). The MITRE truncate below cascades to
             # the polymorphic tag join, but the template rows themselves must be
             # wiped first because `scenario_template_tests.test_template_id` is

backend/app/api/missions.py

@@ -0,0 +1,498 @@
+"""Missions API.
+
+Per spec §4: a non-admin user can only see (or edit) missions they are a
+member of. The decorator stack here gates the *action type* by permission
+code; the service layer applies the membership filter. Both layers fail
+closed.
+
+Status transitions are routed through a single POST endpoint that accepts a
+target status. We accept either `mission.update` or `mission.archive` at the
+gate — archiving requires the dedicated perm if the target is `archived`, and
+the service enforces the lifecycle graph (`_VALID_TRANSITIONS`).
+"""
+
+from __future__ import annotations
+
+import logging
+import uuid
+from datetime import date
+from typing import Any
+
+from flask import Blueprint, abort, g, jsonify, request
+from pydantic import BaseModel, Field, ValidationError
+
+from app.core.auth_decorators import AuthenticatedUser, require_auth, require_perm
+from app.services import missions as svc
+
+bp = Blueprint("missions", __name__, url_prefix="/missions")
+log = logging.getLogger("metamorph.api.missions")
+
+
+# --------------------------------------------------------------------------- #
+# Payloads
+# --------------------------------------------------------------------------- #
+
+
+class MemberPayload(BaseModel):
+    user_id: uuid.UUID
+    role_hint: str = Field(min_length=1, max_length=8)
+
+    model_config = {"extra": "forbid"}
+
+
+class CreateMissionPayload(BaseModel):
+    name: str = Field(min_length=1, max_length=255)
+    client_target: str | None = Field(default=None, max_length=255)
+    date_start: date | None = None
+    date_end: date | None = None
+    description_md: str | None = Field(default=None, max_length=20_000)
+    scenario_template_ids: list[uuid.UUID] = Field(default_factory=list, max_length=64)
+    members: list[MemberPayload] = Field(default_factory=list, max_length=128)
+
+    model_config = {"extra": "forbid"}
+
+
+class UpdateMissionPayload(BaseModel):
+    name: str | None = Field(default=None, min_length=1, max_length=255)
+    client_target: str | None = Field(default=None, max_length=255)
+    date_start: date | None = None
+    date_end: date | None = None
+    description_md: str | None = Field(default=None, max_length=20_000)
+
+    model_config = {"extra": "forbid"}
+
+
+class AddScenariosPayload(BaseModel):
+    scenario_template_ids: list[uuid.UUID] = Field(default_factory=list, max_length=64)
+
+    model_config = {"extra": "forbid"}
+
+
+class SetMembersPayload(BaseModel):
+    members: list[MemberPayload] = Field(default_factory=list, max_length=128)
+
+    model_config = {"extra": "forbid"}
+
+
+class TransitionPayload(BaseModel):
+    status: str = Field(min_length=1, max_length=16)
+
+    model_config = {"extra": "forbid"}
+
+
+# --------------------------------------------------------------------------- #
+# Serialisers
+# --------------------------------------------------------------------------- #
+
+
+def _serialize_member(m: svc.MissionMemberView) -> dict[str, Any]:
+    return {
+        "user_id": str(m.user_id),
+        "user_email": m.user_email,
+        "user_display_name": m.user_display_name,
+        "role_hint": m.role_hint,
+    }
+
+
+def _serialize_mitre_tag(tag: svc.MissionMitreTagView) -> dict[str, Any]:
+    return {
+        "kind": tag.kind,
+        "external_id": tag.external_id,
+        "name": tag.name,
+        "url": tag.url,
+    }
+
+
+def _serialize_test(t: svc.MissionTestView) -> dict[str, Any]:
+    return {
+        "id": str(t.id),
+        "position": t.position,
+        "snapshot_name": t.snapshot_name,
+        "snapshot_description": t.snapshot_description,
+        "snapshot_objective": t.snapshot_objective,
+        "snapshot_procedure_md": t.snapshot_procedure_md,
+        "snapshot_prerequisites_md": t.snapshot_prerequisites_md,
+        "snapshot_expected_red_md": t.snapshot_expected_red_md,
+        "snapshot_expected_blue_md": t.snapshot_expected_blue_md,
+        "snapshot_opsec_level": t.snapshot_opsec_level,
+        "snapshot_tags": t.snapshot_tags,
+        "snapshot_expected_iocs": t.snapshot_expected_iocs,
+        "state": t.state,
+        "executed_at": t.executed_at.isoformat() if t.executed_at else None,
+        "executed_at_overridden": t.executed_at_overridden,
+        "mitre_tags": [_serialize_mitre_tag(tag) for tag in t.mitre_tags],
+        "source_test_template_id": (
+            str(t.source_test_template_id) if t.source_test_template_id else None
+        ),
+    }
+
+
+def _serialize_scenario(sc: svc.MissionScenarioView) -> dict[str, Any]:
+    return {
+        "id": str(sc.id),
+        "position": sc.position,
+        "snapshot_name": sc.snapshot_name,
+        "snapshot_description": sc.snapshot_description,
+        "tests": [_serialize_test(t) for t in sc.tests],
+        "source_scenario_template_id": (
+            str(sc.source_scenario_template_id)
+            if sc.source_scenario_template_id
+            else None
+        ),
+    }
+
+
+def _serialize_list_item(m: svc.MissionListItemView) -> dict[str, Any]:
+    return {
+        "id": str(m.id),
+        "name": m.name,
+        "client_target": m.client_target,
+        "date_start": m.date_start.isoformat() if m.date_start else None,
+        "date_end": m.date_end.isoformat() if m.date_end else None,
+        "status": m.status,
+        "description_md": m.description_md,
+        "visibility_mode": m.visibility_mode,
+        "scenarios_count": m.scenarios_count,
+        "tests_count": m.tests_count,
+        "members_count": m.members_count,
+        "deleted_at": m.deleted_at.isoformat() if m.deleted_at else None,
+        "created_at": m.created_at.isoformat(),
+        "updated_at": m.updated_at.isoformat(),
+    }
+
+
+def _serialize_detail(m: svc.MissionView) -> dict[str, Any]:
+    base = {
+        "id": str(m.id),
+        "name": m.name,
+        "client_target": m.client_target,
+        "date_start": m.date_start.isoformat() if m.date_start else None,
+        "date_end": m.date_end.isoformat() if m.date_end else None,
+        "status": m.status,
+        "description_md": m.description_md,
+        "visibility_mode": m.visibility_mode,
+        "scenarios_count": m.scenarios_count,
+        "tests_count": m.tests_count,
+        "members_count": m.members_count,
+        "deleted_at": m.deleted_at.isoformat() if m.deleted_at else None,
+        "created_at": m.created_at.isoformat(),
+        "updated_at": m.updated_at.isoformat(),
+    }
+    base["scenarios"] = [_serialize_scenario(sc) for sc in m.scenarios]
+    base["members"] = [_serialize_member(mb) for mb in m.members]
+    return base
+
+
+# --------------------------------------------------------------------------- #
+# Helpers
+# --------------------------------------------------------------------------- #
+
+
+def _parse_uuid_or_400(raw: str) -> uuid.UUID | None:
+    try:
+        return uuid.UUID(raw)
+    except ValueError:
+        return None
+
+
+def _pagination_args() -> tuple[int, int] | tuple[None, tuple[int, str]]:
+    try:
+        limit = int(request.args.get("limit", "100"))
+        offset = int(request.args.get("offset", "0"))
+    except ValueError:
+        return None, (400, "invalid_pagination")
+    return max(1, min(limit, 500)), max(0, offset)
+
+
+def _current_user() -> AuthenticatedUser:
+    user: AuthenticatedUser | None = getattr(g, "current_user", None)
+    if user is None:
+        abort(401, description="not authenticated")
+    assert user is not None  # for Pyright; abort raises HTTPException
+    return user
+
+
+def _to_assignments(payload_members: list[MemberPayload]) -> list[svc.MemberAssignment]:
+    return [
+        svc.MemberAssignment(user_id=m.user_id, role_hint=m.role_hint)
+        for m in payload_members
+    ]
+
+
+# --------------------------------------------------------------------------- #
+# Endpoints
+# --------------------------------------------------------------------------- #
+
+
+@bp.get("")
+@require_auth
+@require_perm("mission.read")
+def list_missions():
+    paging = _pagination_args()
+    if paging[0] is None:
+        return jsonify({"error": paging[1][1]}), paging[1][0]
+    limit, offset = paging
+    q = request.args.get("q") or None
+    status = request.args.get("status") or None
+    client = request.args.get("client") or None
+    include_deleted = request.args.get("include_deleted", "false").lower() == "true"
+
+    user = _current_user()
+    if include_deleted and not user.is_admin:
+        return jsonify({"error": "forbidden"}), 403
+
+    try:
+        items, total = svc.list_missions(
+            viewer_id=user.id,
+            viewer_is_admin=user.is_admin,
+            q=q,
+            status=status,
+            client=client,
+            include_deleted=include_deleted,
+            limit=limit,
+            offset=offset,
+        )
+    except ValueError as e:
+        return jsonify({"error": "invalid_request", "message": str(e)}), 400
+    return jsonify(
+        {
+            "items": [_serialize_list_item(it) for it in items],
+            "total": total,
+            "limit": limit,
+            "offset": offset,
+        }
+    )
+
+
+@bp.get("/<mission_id>")
+@require_auth
+@require_perm("mission.read")
+def get_mission(mission_id: str):
+    mid = _parse_uuid_or_400(mission_id)
+    if mid is None:
+        return jsonify({"error": "invalid_id"}), 400
+    include_deleted = request.args.get("include_deleted", "false").lower() == "true"
+    user = _current_user()
+    if include_deleted and not user.is_admin:
+        return jsonify({"error": "forbidden"}), 403
+    try:
+        view = svc.get_mission(
+            mid,
+            viewer_id=user.id,
+            viewer_is_admin=user.is_admin,
+            include_deleted=include_deleted,
+        )
+    except svc.MissionNotFound:
+        return jsonify({"error": "not_found"}), 404
+    return jsonify(_serialize_detail(view))
+
+
+@bp.post("")
+@require_auth
+@require_perm("mission.create")
+def create_mission():
+    try:
+        payload = CreateMissionPayload.model_validate(request.get_json(silent=True) or {})
+    except ValidationError as e:
+        return jsonify({"error": "invalid_request", "details": e.errors()}), 400
+    user = _current_user()
+    try:
+        view = svc.create_mission(
+            name=payload.name,
+            creator_id=user.id,
+            creator_is_admin=user.is_admin,
+            client_target=payload.client_target,
+            date_start=payload.date_start,
+            date_end=payload.date_end,
+            description_md=payload.description_md,
+            scenario_template_ids=list(payload.scenario_template_ids),
+            members=_to_assignments(payload.members),
+        )
+    except svc.UnknownScenarioTemplate as e:
+        return jsonify({"error": "unknown_scenario_template", "message": str(e)}), 400
+    except svc.UnknownUser as e:
+        return jsonify({"error": "unknown_user", "message": str(e)}), 400
+    except svc.InvalidMemberPayload as e:
+        return jsonify({"error": "invalid_member", "message": str(e)}), 400
+    except ValueError as e:
+        return jsonify({"error": "invalid_request", "message": str(e)}), 400
+    log.info(
+        "metamorph.mission.created",
+        extra={
+            "mission_id": str(view.id),
+            "scenarios": view.scenarios_count,
+            "tests": view.tests_count,
+            "members": view.members_count,
+        },
+    )
+    return jsonify(_serialize_detail(view)), 201
+
+
+@bp.put("/<mission_id>")
+@require_auth
+@require_perm("mission.update")
+def update_mission(mission_id: str):
+    mid = _parse_uuid_or_400(mission_id)
+    if mid is None:
+        return jsonify({"error": "invalid_id"}), 400
+    raw = request.get_json(silent=True) or {}
+    try:
+        payload = UpdateMissionPayload.model_validate(raw)
+    except ValidationError as e:
+        return jsonify({"error": "invalid_request", "details": e.errors()}), 400
+    # Distinguish "not provided" from "explicitly null" by looking at the raw body.
+    kwargs: dict[str, Any] = {}
+    if "name" in raw and payload.name is not None:
+        kwargs["name"] = payload.name
+    if "client_target" in raw:
+        kwargs["client_target"] = payload.client_target
+    if "date_start" in raw:
+        kwargs["date_start"] = payload.date_start
+    if "date_end" in raw:
+        kwargs["date_end"] = payload.date_end
+    if "description_md" in raw:
+        kwargs["description_md"] = payload.description_md
+    user = _current_user()
+    try:
+        view = svc.update_mission_metadata(
+            mid,
+            viewer_id=user.id,
+            viewer_is_admin=user.is_admin,
+            **kwargs,
+        )
+    except svc.MissionNotFound:
+        return jsonify({"error": "not_found"}), 404
+    except ValueError as e:
+        return jsonify({"error": "invalid_request", "message": str(e)}), 400
+    return jsonify(_serialize_detail(view))
+
+
+@bp.post("/<mission_id>/scenarios")
+@require_auth
+@require_perm("mission.update")
+def add_scenarios(mission_id: str):
+    mid = _parse_uuid_or_400(mission_id)
+    if mid is None:
+        return jsonify({"error": "invalid_id"}), 400
+    try:
+        payload = AddScenariosPayload.model_validate(request.get_json(silent=True) or {})
+    except ValidationError as e:
+        return jsonify({"error": "invalid_request", "details": e.errors()}), 400
+    user = _current_user()
+    try:
+        view = svc.add_scenarios_to_mission(
+            mid,
+            list(payload.scenario_template_ids),
+            viewer_id=user.id,
+            viewer_is_admin=user.is_admin,
+        )
+    except svc.MissionNotFound:
+        return jsonify({"error": "not_found"}), 404
+    except svc.UnknownScenarioTemplate as e:
+        return jsonify({"error": "unknown_scenario_template", "message": str(e)}), 400
+    log.info(
+        "metamorph.mission.scenarios_added",
+        extra={
+            "mission_id": str(mid),
+            "added": len(payload.scenario_template_ids),
+        },
+    )
+    return jsonify(_serialize_detail(view))
+
+
+@bp.put("/<mission_id>/members")
+@require_auth
+@require_perm("mission.update")
+def set_members(mission_id: str):
+    mid = _parse_uuid_or_400(mission_id)
+    if mid is None:
+        return jsonify({"error": "invalid_id"}), 400
+    try:
+        payload = SetMembersPayload.model_validate(request.get_json(silent=True) or {})
+    except ValidationError as e:
+        return jsonify({"error": "invalid_request", "details": e.errors()}), 400
+    user = _current_user()
+    try:
+        view = svc.set_mission_members(
+            mid,
+            _to_assignments(payload.members),
+            viewer_id=user.id,
+            viewer_is_admin=user.is_admin,
+        )
+    except svc.MissionNotFound:
+        return jsonify({"error": "not_found"}), 404
+    except svc.UnknownUser as e:
+        return jsonify({"error": "unknown_user", "message": str(e)}), 400
+    except svc.InvalidMemberPayload as e:
+        return jsonify({"error": "invalid_member", "message": str(e)}), 400
+    return jsonify(_serialize_detail(view))
+
+
+@bp.post("/<mission_id>/transition")
+@require_auth
+@require_perm("mission.update", "mission.archive")
+def transition(mission_id: str):
+    """Status transition. The outer decorator gates the endpoint on holding
+    EITHER `mission.update` or `mission.archive` — so a request with neither
+    perm sees 403 before its body is even parsed (no shape leak via 400).
+    The inner refinement then enforces the per-target rule: `mission.archive`
+    is required when the target is `archived`; `mission.update` covers the
+    other transitions. Admins bypass via the decorator's `is_admin` check.
+    """
+    mid = _parse_uuid_or_400(mission_id)
+    if mid is None:
+        return jsonify({"error": "invalid_id"}), 400
+    try:
+        payload = TransitionPayload.model_validate(request.get_json(silent=True) or {})
+    except ValidationError as e:
+        return jsonify({"error": "invalid_request", "details": e.errors()}), 400
+    user = _current_user()
+    required = "mission.archive" if payload.status == "archived" else "mission.update"
+    if not user.is_admin and required not in user.permissions:
+        log.info(
+            "metamorph.auth.permission_denied",
+            extra={
+                "user_id": str(user.id),
+                "required": [required],
+                "had": sorted(user.permissions),
+            },
+        )
+        return jsonify({"error": "forbidden"}), 403
+    try:
+        view = svc.transition_mission_status(
+            mid,
+            payload.status,
+            viewer_id=user.id,
+            viewer_is_admin=user.is_admin,
+        )
+    except svc.MissionNotFound:
+        return jsonify({"error": "not_found"}), 404
+    except svc.InvalidTransition as e:
+        return jsonify({"error": "invalid_transition", "message": str(e)}), 409
+    except ValueError as e:
+        return jsonify({"error": "invalid_request", "message": str(e)}), 400
+    log.info(
+        "metamorph.mission.transitioned",
+        extra={"mission_id": str(mid), "status": view.status},
+    )
+    return jsonify(_serialize_detail(view))
+
+
+@bp.delete("/<mission_id>")
+@require_auth
+@require_perm("mission.delete")
+def soft_delete_mission(mission_id: str):
+    mid = _parse_uuid_or_400(mission_id)
+    if mid is None:
+        return jsonify({"error": "invalid_id"}), 400
+    user = _current_user()
+    try:
+        svc.soft_delete_mission(
+            mid,
+            viewer_id=user.id,
+            viewer_is_admin=user.is_admin,
+        )
+    except svc.MissionNotFound:
+        return jsonify({"error": "not_found"}), 404
+    log.info("metamorph.mission.soft_deleted", extra={"mission_id": str(mid)})
+    return jsonify({"ok": True})

backend/app/api/users.py

@@ -56,6 +56,37 @@ def _parse_uuid_or_400(raw: str):
         return None
 
 
+@bp.get("/roster")
+@require_auth
+@require_perm("user.read", "mission.create", "mission.update")
+def list_roster():
+    """Minimal user list for mission member assignment.
+
+    Returns only `id`, `email`, `display_name` of active, non-deleted users.
+    Accessible to anyone who can create or update a mission — strictly lighter
+    than `GET /users`, which leaks `is_admin` (via groups), `is_active`, and
+    group memberships and is therefore reserved to `user.read`.
+    """
+    q = request.args.get("q") or None
+    rows = users_svc.list_users(q=q, is_active=True, limit=200, offset=0)[0]
+    # Sort by email for predictable rendering and stable e2e selectors.
+    return jsonify(
+        {
+            "items": [
+                {
+                    "id": str(u.id),
+                    "email": u.email,
+                    "display_name": u.display_name,
+                }
+                for u in sorted(
+                    (u for u in rows if u.deleted_at is None),
+                    key=lambda x: x.email,
+                )
+            ]
+        }
+    )
+
+
 @bp.get("")
 @require_auth
 @require_perm("user.read")

backend/app/api/v1.py

@@ -9,6 +9,7 @@ from app.api.diag import bp as diag_bp
 from app.api.groups import bp as groups_bp
 from app.api.health import bp as health_bp
 from app.api.invitations import bp as invitations_bp
+from app.api.missions import bp as missions_bp
 from app.api.mitre import bp as mitre_bp
 from app.api.permissions import bp as permissions_bp
 from app.api.scenario_templates import bp as scenario_templates_bp
@@ -28,3 +29,4 @@ bp.register_blueprint(permissions_bp)
 bp.register_blueprint(mitre_bp)
 bp.register_blueprint(test_templates_bp)
 bp.register_blueprint(scenario_templates_bp)
+bp.register_blueprint(missions_bp)

backend/app/services/missions.py

@@ -0,0 +1,944 @@
+"""Mission CRUD + snapshot service.
+
+A mission is a *materialised* run of one or more scenario templates: when the
+mission is created (or scenarios are appended later), the service copies the
+template rows into `mission_scenarios` / `mission_tests` / `mission_test_mitre_tags`
+verbatim. Editing the source templates afterwards does not touch the mission —
+that's the snapshot contract from spec §11.
+
+Visibility rule (spec §4, last bullet): a non-admin user can only see a mission
+they are a member of. The decorator layer enforces *which type of action* is
+allowed (perm codes); this service enforces *which mission* is visible.
+"""
+
+from __future__ import annotations
+
+import hashlib
+import uuid
+from dataclasses import dataclass
+from datetime import date, datetime, timezone
+from typing import Any, Iterable
+
+from sqlalchemy import func, or_, select, text
+from sqlalchemy.orm import Session, selectinload
+
+from app.db.session import session_scope
+from app.db.types import (
+    MISSION_ROLE_HINTS,
+    MISSION_STATUSES,
+)
+from app.models.auth import User
+from app.models.mission import (
+    Mission,
+    MissionMember,
+    MissionScenario,
+    MissionTest,
+    MissionTestMitreTag,
+)
+from app.models.mitre import MitreSubtechnique, MitreTactic, MitreTechnique
+from app.models.template import (
+    ScenarioTemplate,
+    TestTemplate,
+    TestTemplateMitreTag,
+)
+
+_UNSET: Any = object()
+
+
+# Status transition graph. A target status that's not in the source's set is
+# rejected as InvalidTransition. `archived` is a one-way sink (un-archiving
+# would require an explicit restore endpoint, out of M6 scope).
+_VALID_TRANSITIONS: dict[str, frozenset[str]] = {
+    "draft": frozenset({"in_progress", "archived"}),
+    "in_progress": frozenset({"completed", "archived"}),
+    "completed": frozenset({"archived"}),
+    "archived": frozenset(),
+}
+
+
+# --------------------------------------------------------------------------- #
+# Exceptions
+# --------------------------------------------------------------------------- #
+
+
+class MissionNotFound(Exception):
+    """Mission missing, soft-deleted, or not visible to the viewer."""
+
+
+class UnknownScenarioTemplate(Exception):
+    pass
+
+
+class UnknownUser(Exception):
+    pass
+
+
+class InvalidTransition(Exception):
+    pass
+
+
+class InvalidMemberPayload(Exception):
+    pass
+
+
+# --------------------------------------------------------------------------- #
+# Views (detached dataclasses — safe to return after session_scope exits)
+# --------------------------------------------------------------------------- #
+
+
+@dataclass(frozen=True)
+class MemberAssignment:
+    """Inbound member spec. The service resolves the user and validates the hint."""
+
+    user_id: uuid.UUID
+    role_hint: str
+
+
+@dataclass(frozen=True)
+class MissionMemberView:
+    user_id: uuid.UUID
+    user_email: str
+    user_display_name: str | None
+    role_hint: str
+
+
+@dataclass(frozen=True)
+class MissionMitreTagView:
+    kind: str
+    external_id: str
+    name: str
+    url: str | None
+
+
+@dataclass(frozen=True)
+class MissionTestView:
+    id: uuid.UUID
+    position: int
+    snapshot_name: str
+    snapshot_description: str | None
+    snapshot_objective: str | None
+    snapshot_procedure_md: str | None
+    snapshot_prerequisites_md: str | None
+    snapshot_expected_red_md: str | None
+    snapshot_expected_blue_md: str | None
+    snapshot_opsec_level: str
+    snapshot_tags: list[str]
+    snapshot_expected_iocs: list[str]
+    state: str
+    executed_at: datetime | None
+    executed_at_overridden: bool
+    mitre_tags: list[MissionMitreTagView]
+    source_test_template_id: uuid.UUID | None
+
+
+@dataclass(frozen=True)
+class MissionScenarioView:
+    id: uuid.UUID
+    position: int
+    snapshot_name: str
+    snapshot_description: str | None
+    tests: list[MissionTestView]
+    source_scenario_template_id: uuid.UUID | None
+
+
+@dataclass(frozen=True)
+class MissionListItemView:
+    id: uuid.UUID
+    name: str
+    client_target: str | None
+    date_start: date | None
+    date_end: date | None
+    status: str
+    description_md: str | None
+    visibility_mode: str
+    scenarios_count: int
+    tests_count: int
+    members_count: int
+    deleted_at: datetime | None
+    created_at: datetime
+    updated_at: datetime
+
+
+@dataclass(frozen=True)
+class MissionView:
+    id: uuid.UUID
+    name: str
+    client_target: str | None
+    date_start: date | None
+    date_end: date | None
+    status: str
+    description_md: str | None
+    visibility_mode: str
+    scenarios_count: int
+    tests_count: int
+    members_count: int
+    deleted_at: datetime | None
+    created_at: datetime
+    updated_at: datetime
+    scenarios: list[MissionScenarioView]
+    members: list[MissionMemberView]
+
+
+# --------------------------------------------------------------------------- #
+# Helpers
+# --------------------------------------------------------------------------- #
+
+
+def _opt_str(value: str | None) -> str | None:
+    if value is None:
+        return None
+    v = value.strip()
+    return v or None
+
+
+def _normalize_name(value: str) -> str:
+    name = (value or "").strip()
+    if not name:
+        raise ValueError("name is required")
+    if len(name) > 255:
+        raise ValueError("name must be ≤ 255 characters")
+    return name
+
+
+def _validate_dates(date_start: date | None, date_end: date | None) -> None:
+    if date_start and date_end and date_end < date_start:
+        raise ValueError("date_end must be on or after date_start")
+
+
+def _validate_status(value: str) -> str:
+    if value not in MISSION_STATUSES:
+        raise ValueError(f"status must be one of {MISSION_STATUSES}")
+    return value
+
+
+def _validate_role_hint(value: str) -> str:
+    if value not in MISSION_ROLE_HINTS:
+        raise InvalidMemberPayload(f"role_hint must be one of {MISSION_ROLE_HINTS}")
+    return value
+
+
+def _escape_like(raw: str) -> str:
+    """Escape LIKE wildcards so user-typed `%` / `_` / `\\` stay literal."""
+    return raw.replace("\\", "\\\\").replace("%", "\\%").replace("_", "\\_")
+
+
+def _lock_scenario_ids_for_snapshot(s: Session, scenario_ids: list[uuid.UUID]) -> None:
+    """Acquire a per-scenario `pg_advisory_xact_lock` for every source scenario
+    we're about to snapshot.
+
+    Why: a concurrent admin invoking `set_scenario_tests(scenario_id)` (M5)
+    deletes-then-reinserts the `scenario_template_tests` join rows mid-transaction.
+    Under READ COMMITTED, `_snapshot_scenarios` could observe a partial view
+    (selectinload re-queries) and freeze a torn snapshot. Sharing the same lock
+    key as `app.services.scenario_templates.set_scenario_tests` makes the
+    snapshot wait until the reorder commits (and vice versa).
+
+    The lock keys are derived deterministically from the scenario UUIDs via
+    blake2b (cf. lessons: `hash()` is randomised per-worker). We sort the keys
+    before acquiring to avoid deadlocks with another snapshotter that holds
+    them in a different order.
+    """
+    if not scenario_ids:
+        return
+    keys: list[int] = []
+    for sid in scenario_ids:
+        digest = hashlib.blake2b(sid.bytes, digest_size=8).digest()
+        keys.append(int.from_bytes(digest, "big", signed=True))
+    for key in sorted(keys):
+        s.execute(
+            text("SELECT pg_advisory_xact_lock(CAST(:key AS bigint))"),
+            {"key": key},
+        )
+
+
+def _is_member(s: Session, mission_id: uuid.UUID, viewer_id: uuid.UUID) -> bool:
+    return (
+        s.scalar(
+            select(func.count())
+            .select_from(MissionMember)
+            .where(
+                MissionMember.mission_id == mission_id,
+                MissionMember.user_id == viewer_id,
+            )
+        )
+        or 0
+    ) > 0
+
+
+def _membership_filter(viewer_id: uuid.UUID):
+    """SQL predicate restricting to missions where viewer_id is a member."""
+    return Mission.id.in_(
+        select(MissionMember.mission_id).where(MissionMember.user_id == viewer_id)
+    )
+
+
+def _load_users_map(s: Session, ids: Iterable[uuid.UUID]) -> dict[uuid.UUID, User]:
+    ids_list = [i for i in ids]
+    if not ids_list:
+        return {}
+    rows = s.scalars(
+        select(User).where(User.id.in_(ids_list), User.deleted_at.is_(None))
+    ).all()
+    return {u.id: u for u in rows}
+
+
+# --------------------------------------------------------------------------- #
+# MITRE denormalisation
+# --------------------------------------------------------------------------- #
+
+
+def _collect_mitre_ids(
+    tag_rows: Iterable[TestTemplateMitreTag],
+) -> tuple[set[uuid.UUID], set[uuid.UUID], set[uuid.UUID]]:
+    tactic_ids: set[uuid.UUID] = set()
+    technique_ids: set[uuid.UUID] = set()
+    sub_ids: set[uuid.UUID] = set()
+    for tag in tag_rows:
+        if tag.mitre_kind == "tactic" and tag.tactic_id is not None:
+            tactic_ids.add(tag.tactic_id)
+        elif tag.mitre_kind == "technique" and tag.technique_id is not None:
+            technique_ids.add(tag.technique_id)
+        elif tag.mitre_kind == "subtechnique" and tag.subtechnique_id is not None:
+            sub_ids.add(tag.subtechnique_id)
+    return tactic_ids, technique_ids, sub_ids
+
+
+def _resolve_mitre_lookup(
+    s: Session,
+    tactic_ids: set[uuid.UUID],
+    technique_ids: set[uuid.UUID],
+    sub_ids: set[uuid.UUID],
+) -> tuple[
+    dict[uuid.UUID, MitreTactic],
+    dict[uuid.UUID, MitreTechnique],
+    dict[uuid.UUID, MitreSubtechnique],
+]:
+    """Batch-load all MITRE rows referenced by a snapshot in 3 queries."""
+    tactic_map: dict[uuid.UUID, MitreTactic] = {}
+    technique_map: dict[uuid.UUID, MitreTechnique] = {}
+    sub_map: dict[uuid.UUID, MitreSubtechnique] = {}
+    if tactic_ids:
+        tactic_map = {
+            r.id: r
+            for r in s.scalars(
+                select(MitreTactic).where(MitreTactic.id.in_(tactic_ids))
+            ).all()
+        }
+    if technique_ids:
+        technique_map = {
+            r.id: r
+            for r in s.scalars(
+                select(MitreTechnique).where(MitreTechnique.id.in_(technique_ids))
+            ).all()
+        }
+    if sub_ids:
+        sub_map = {
+            r.id: r
+            for r in s.scalars(
+                select(MitreSubtechnique).where(MitreSubtechnique.id.in_(sub_ids))
+            ).all()
+        }
+    return tactic_map, technique_map, sub_map
+
+
+def _snapshot_tag(
+    tag: TestTemplateMitreTag,
+    tactic_map: dict[uuid.UUID, MitreTactic],
+    technique_map: dict[uuid.UUID, MitreTechnique],
+    sub_map: dict[uuid.UUID, MitreSubtechnique],
+) -> MissionTestMitreTag | None:
+    """Convert a template's polymorphic MITRE tag into a frozen mission tag.
+
+    Returns None if the referenced MITRE row vanished between read and snapshot
+    (paranoid: should not happen inside one tx).
+    """
+    if tag.mitre_kind == "tactic" and tag.tactic_id in tactic_map:
+        r = tactic_map[tag.tactic_id]
+        return MissionTestMitreTag(
+            mitre_kind="tactic",
+            mitre_external_id=r.external_id,
+            mitre_name=r.name,
+            mitre_url=r.url,
+        )
+    if tag.mitre_kind == "technique" and tag.technique_id in technique_map:
+        r = technique_map[tag.technique_id]
+        return MissionTestMitreTag(
+            mitre_kind="technique",
+            mitre_external_id=r.external_id,
+            mitre_name=r.name,
+            mitre_url=r.url,
+        )
+    if tag.mitre_kind == "subtechnique" and tag.subtechnique_id in sub_map:
+        r = sub_map[tag.subtechnique_id]
+        return MissionTestMitreTag(
+            mitre_kind="subtechnique",
+            mitre_external_id=r.external_id,
+            mitre_name=r.name,
+            mitre_url=r.url,
+        )
+    return None
+
+
+# --------------------------------------------------------------------------- #
+# Snapshot
+# --------------------------------------------------------------------------- #
+
+
+def _load_scenario_templates_for_snapshot(
+    s: Session, scenario_ids: list[uuid.UUID]
+) -> dict[uuid.UUID, ScenarioTemplate]:
+    """Load scenarios in eager-load mode and reject unknowns/soft-deleted upfront."""
+    if not scenario_ids:
+        return {}
+    rows = s.scalars(
+        select(ScenarioTemplate)
+        .options(selectinload(ScenarioTemplate.tests))
+        .where(ScenarioTemplate.id.in_(scenario_ids))
+    ).all()
+    by_id = {sc.id: sc for sc in rows}
+    missing = set(scenario_ids) - by_id.keys()
+    if missing:
+        raise UnknownScenarioTemplate(
+            f"unknown scenario_template ids: {sorted(str(m) for m in missing)}"
+        )
+    deleted = [sc.id for sc in rows if sc.deleted_at is not None]
+    if deleted:
+        raise UnknownScenarioTemplate(
+            f"cannot snapshot soft-deleted scenario_template ids: "
+            f"{sorted(str(d) for d in deleted)}"
+        )
+    return by_id
+
+
+def _snapshot_scenarios(
+    s: Session,
+    mission_id: uuid.UUID,
+    scenario_ids: list[uuid.UUID],
+    start_position: int,
+) -> None:
+    """Append `scenario_ids` as new MissionScenario+MissionTest rows under the mission.
+
+    Position counter continues from `start_position`. Each scenario_template's
+    `tests` order is preserved 1:1. MITRE tags on the source templates are
+    copied as denormalised `MissionTestMitreTag` rows (frozen external_id/name/url).
+    """
+    if not scenario_ids:
+        return
+
+    _lock_scenario_ids_for_snapshot(s, scenario_ids)
+    sc_by_id = _load_scenario_templates_for_snapshot(s, scenario_ids)
+
+    # Collect the underlying test_template ids in stable order.
+    ordered_test_ids: list[uuid.UUID] = []
+    for sid in scenario_ids:
+        sc = sc_by_id[sid]
+        for link in sc.tests:
+            ordered_test_ids.append(link.test_template_id)
+
+    test_template_map: dict[uuid.UUID, TestTemplate] = {}
+    if ordered_test_ids:
+        test_template_rows = s.scalars(
+            select(TestTemplate)
+            .options(selectinload(TestTemplate.mitre_tags))
+            .where(TestTemplate.id.in_(set(ordered_test_ids)))
+        ).all()
+        test_template_map = {t.id: t for t in test_template_rows}
+        # A test_template may be soft-deleted between the scenario authoring and
+        # the mission creation. We do not refuse the snapshot (the user expects
+        # the scenario's planned tests to appear); we just freeze the last
+        # known content, which is what a snapshot is for.
+        missing_t = set(ordered_test_ids) - test_template_map.keys()
+        if missing_t:
+            raise UnknownScenarioTemplate(
+                f"scenario references missing test_template ids: "
+                f"{sorted(str(m) for m in missing_t)}"
+            )
+
+    # Pre-load all MITRE rows referenced by any tag across all involved templates.
+    all_tag_rows: list[TestTemplateMitreTag] = []
+    for t in test_template_map.values():
+        all_tag_rows.extend(t.mitre_tags)
+    tactic_map, technique_map, sub_map = _resolve_mitre_lookup(
+        s, *_collect_mitre_ids(all_tag_rows)
+    )
+
+    pos = start_position
+    for sid in scenario_ids:
+        sc = sc_by_id[sid]
+        ms = MissionScenario(
+            mission_id=mission_id,
+            source_scenario_template_id=sc.id,
+            snapshot_name=sc.name,
+            snapshot_description=sc.description,
+            position=pos,
+        )
+        s.add(ms)
+        s.flush()  # populate ms.id for the child tests
+
+        test_pos = 0
+        for link in sc.tests:
+            tt = test_template_map[link.test_template_id]
+            mt = MissionTest(
+                scenario_id=ms.id,
+                source_test_template_id=tt.id,
+                position=test_pos,
+                snapshot_name=tt.name,
+                snapshot_description=tt.description,
+                snapshot_objective=tt.objective,
+                snapshot_procedure_md=tt.procedure_md,
+                snapshot_prerequisites_md=tt.prerequisites_md,
+                snapshot_expected_red_md=tt.expected_result_red_md,
+                snapshot_expected_blue_md=tt.expected_detection_blue_md,
+                snapshot_opsec_level=tt.opsec_level,
+                snapshot_tags=list(tt.tags or []),
+                snapshot_expected_iocs=list(tt.expected_iocs or []),
+                state="pending",
+            )
+            s.add(mt)
+            s.flush()
+            for src_tag in tt.mitre_tags:
+                snap = _snapshot_tag(src_tag, tactic_map, technique_map, sub_map)
+                if snap is not None:
+                    snap.mission_test_id = mt.id
+                    s.add(snap)
+            test_pos += 1
+        pos += 1
+    s.flush()
+
+
+# --------------------------------------------------------------------------- #
+# View assembly
+# --------------------------------------------------------------------------- #
+
+
+def _member_views(s: Session, mission: Mission) -> list[MissionMemberView]:
+    if not mission.members:
+        return []
+    users = _load_users_map(s, [m.user_id for m in mission.members])
+    out: list[MissionMemberView] = []
+    for m in mission.members:
+        u = users.get(m.user_id)
+        out.append(
+            MissionMemberView(
+                user_id=m.user_id,
+                user_email=u.email if u else "<deleted>",
+                user_display_name=(u.display_name if u else None),
+                role_hint=m.role_hint,
+            )
+        )
+    out.sort(key=lambda mv: (mv.role_hint, mv.user_email))
+    return out
+
+
+def _scenario_views(scenarios: list[MissionScenario]) -> list[MissionScenarioView]:
+    """Assemble scenario views. `mission_scenarios` and `mission_tests` both
+    carry `SoftDeleteMixin`; M6 doesn't surface soft-deletion of those rows in
+    any endpoint, but the filter is applied here so future deletions (M7+)
+    don't drift the rendered list silently."""
+    views: list[MissionScenarioView] = []
+    live = [sc for sc in scenarios if sc.deleted_at is None]
+    for sc in sorted(live, key=lambda s_: s_.position):
+        test_views: list[MissionTestView] = []
+        live_tests = [t for t in sc.tests if t.deleted_at is None]
+        for t in sorted(live_tests, key=lambda t_: t_.position):
+            tag_views = [
+                MissionMitreTagView(
+                    kind=tag.mitre_kind,
+                    external_id=tag.mitre_external_id,
+                    name=tag.mitre_name,
+                    url=tag.mitre_url,
+                )
+                for tag in sorted(
+                    t.mitre_tags, key=lambda tg: (tg.mitre_kind, tg.mitre_external_id)
+                )
+            ]
+            test_views.append(
+                MissionTestView(
+                    id=t.id,
+                    position=t.position,
+                    snapshot_name=t.snapshot_name,
+                    snapshot_description=t.snapshot_description,
+                    snapshot_objective=t.snapshot_objective,
+                    snapshot_procedure_md=t.snapshot_procedure_md,
+                    snapshot_prerequisites_md=t.snapshot_prerequisites_md,
+                    snapshot_expected_red_md=t.snapshot_expected_red_md,
+                    snapshot_expected_blue_md=t.snapshot_expected_blue_md,
+                    snapshot_opsec_level=t.snapshot_opsec_level,
+                    snapshot_tags=list(t.snapshot_tags or []),
+                    snapshot_expected_iocs=list(t.snapshot_expected_iocs or []),
+                    state=t.state,
+                    executed_at=t.executed_at,
+                    executed_at_overridden=t.executed_at_overridden,
+                    mitre_tags=tag_views,
+                    source_test_template_id=t.source_test_template_id,
+                )
+            )
+        views.append(
+            MissionScenarioView(
+                id=sc.id,
+                position=sc.position,
+                snapshot_name=sc.snapshot_name,
+                snapshot_description=sc.snapshot_description,
+                tests=test_views,
+                source_scenario_template_id=sc.source_scenario_template_id,
+            )
+        )
+    return views
+
+
+def _to_detail_view(s: Session, m: Mission) -> MissionView:
+    scenarios = [sc for sc in m.scenarios if sc.deleted_at is None]
+    members = _member_views(s, m)
+    scenario_views = _scenario_views(scenarios)
+    tests_count = sum(len(sc.tests) for sc in scenario_views)
+    return MissionView(
+        id=m.id,
+        name=m.name,
+        client_target=m.client_target,
+        date_start=m.date_start,
+        date_end=m.date_end,
+        status=m.status,
+        description_md=m.description_md,
+        visibility_mode=m.visibility_mode,
+        scenarios_count=len(scenario_views),
+        tests_count=tests_count,
+        members_count=len(members),
+        deleted_at=m.deleted_at,
+        created_at=m.created_at,
+        updated_at=m.updated_at,
+        scenarios=scenario_views,
+        members=members,
+    )
+
+
+def _to_list_item(m: Mission) -> MissionListItemView:
+    # Cheap counts via the loaded relationships (selectinloaded by the caller).
+    # We filter soft-deleted children consistently with `_scenario_views` so
+    # the list and the detail page agree.
+    live_scenarios = [sc for sc in m.scenarios if sc.deleted_at is None]
+    tests_count = sum(
+        len([t for t in sc.tests if t.deleted_at is None]) for sc in live_scenarios
+    )
+    return MissionListItemView(
+        id=m.id,
+        name=m.name,
+        client_target=m.client_target,
+        date_start=m.date_start,
+        date_end=m.date_end,
+        status=m.status,
+        description_md=m.description_md,
+        visibility_mode=m.visibility_mode,
+        scenarios_count=len(live_scenarios),
+        tests_count=tests_count,
+        members_count=len(m.members),
+        deleted_at=m.deleted_at,
+        created_at=m.created_at,
+        updated_at=m.updated_at,
+    )
+
+
+# --------------------------------------------------------------------------- #
+# Public API — list / get
+# --------------------------------------------------------------------------- #
+
+
+def list_missions(
+    *,
+    viewer_id: uuid.UUID,
+    viewer_is_admin: bool,
+    q: str | None = None,
+    status: str | None = None,
+    client: str | None = None,
+    include_deleted: bool = False,
+    limit: int = 100,
+    offset: int = 0,
+) -> tuple[list[MissionListItemView], int]:
+    with session_scope() as s:
+        stmt = (
+            select(Mission)
+            .options(
+                selectinload(Mission.scenarios).selectinload(MissionScenario.tests),
+                selectinload(Mission.members),
+            )
+            .order_by(Mission.created_at.desc(), Mission.id.desc())
+        )
+        count_stmt = select(func.count()).select_from(Mission)
+
+        if not include_deleted:
+            stmt = stmt.where(Mission.deleted_at.is_(None))
+            count_stmt = count_stmt.where(Mission.deleted_at.is_(None))
+        if not viewer_is_admin:
+            stmt = stmt.where(_membership_filter(viewer_id))
+            count_stmt = count_stmt.where(_membership_filter(viewer_id))
+        if status:
+            _validate_status(status)
+            stmt = stmt.where(Mission.status == status)
+            count_stmt = count_stmt.where(Mission.status == status)
+        if client:
+            like = f"%{_escape_like(client.lower())}%"
+            cond = func.lower(Mission.client_target).like(like, escape="\\")
+            stmt = stmt.where(cond)
+            count_stmt = count_stmt.where(cond)
+        if q:
+            like = f"%{_escape_like(q.lower())}%"
+            cond = or_(
+                func.lower(Mission.name).like(like, escape="\\"),
+                func.lower(Mission.description_md).like(like, escape="\\"),
+            )
+            stmt = stmt.where(cond)
+            count_stmt = count_stmt.where(cond)
+
+        total = s.scalar(count_stmt) or 0
+        rows = s.scalars(
+            stmt.limit(max(1, min(limit, 500))).offset(max(0, offset))
+        ).all()
+        return [_to_list_item(m) for m in rows], int(total)
+
+
+def get_mission(
+    mission_id: uuid.UUID,
+    *,
+    viewer_id: uuid.UUID,
+    viewer_is_admin: bool,
+    include_deleted: bool = False,
+) -> MissionView:
+    with session_scope() as s:
+        m = s.get(Mission, mission_id)
+        if m is None:
+            raise MissionNotFound()
+        if m.deleted_at is not None and not include_deleted:
+            raise MissionNotFound()
+        if not viewer_is_admin and not _is_member(s, mission_id, viewer_id):
+            raise MissionNotFound()
+        return _to_detail_view(s, m)
+
+
+# --------------------------------------------------------------------------- #
+# Public API — write
+# --------------------------------------------------------------------------- #
+
+
+def _validate_members(s: Session, members: list[MemberAssignment]) -> None:
+    """Reject duplicates, bad role hints, unknown/soft-deleted users."""
+    seen: set[uuid.UUID] = set()
+    for m in members:
+        if m.user_id in seen:
+            raise InvalidMemberPayload(f"duplicate user_id: {m.user_id}")
+        seen.add(m.user_id)
+        _validate_role_hint(m.role_hint)
+    if not members:
+        return
+    user_map = _load_users_map(s, seen)
+    missing = seen - user_map.keys()
+    if missing:
+        raise UnknownUser(f"unknown or deleted user_ids: {sorted(str(u) for u in missing)}")
+
+
+def create_mission(
+    *,
+    name: str,
+    creator_id: uuid.UUID,
+    creator_is_admin: bool,
+    client_target: str | None = None,
+    date_start: date | None = None,
+    date_end: date | None = None,
+    description_md: str | None = None,
+    scenario_template_ids: list[uuid.UUID] | None = None,
+    members: list[MemberAssignment] | None = None,
+) -> MissionView:
+    """Create a mission and snapshot the requested scenarios + their tests.
+
+    Side effect: if `creator_is_admin` is False and the creator is not in
+    `members`, they are added with `role_hint='red'`. This prevents the
+    non-admin creator from immediately losing visibility on the mission they
+    just created (membership-based visibility, see spec §4).
+    """
+    name_norm = _normalize_name(name)
+    _validate_dates(date_start, date_end)
+    scenarios = list(scenario_template_ids or [])
+    members_list = list(members or [])
+
+    with session_scope() as s:
+        _validate_members(s, members_list)
+
+        # Auto-add the non-admin creator as a member so they retain visibility.
+        if not creator_is_admin and not any(m.user_id == creator_id for m in members_list):
+            members_list = [
+                MemberAssignment(user_id=creator_id, role_hint="red"),
+                *members_list,
+            ]
+            # Defensive re-validation in case the creator id was bogus.
+            _validate_members(s, members_list)
+
+        mission = Mission(
+            name=name_norm,
+            client_target=_opt_str(client_target),
+            date_start=date_start,
+            date_end=date_end,
+            description_md=_opt_str(description_md),
+            status="draft",
+            visibility_mode="whitebox",
+        )
+        s.add(mission)
+        s.flush()
+
+        for m in members_list:
+            s.add(
+                MissionMember(
+                    mission_id=mission.id,
+                    user_id=m.user_id,
+                    role_hint=m.role_hint,
+                )
+            )
+
+        if scenarios:
+            _snapshot_scenarios(s, mission.id, scenarios, start_position=0)
+
+        s.flush()
+        s.refresh(mission)
+        return _to_detail_view(s, mission)
+
+
+def update_mission_metadata(
+    mission_id: uuid.UUID,
+    *,
+    viewer_id: uuid.UUID,
+    viewer_is_admin: bool,
+    name: str | None = None,
+    client_target: Any = _UNSET,
+    date_start: Any = _UNSET,
+    date_end: Any = _UNSET,
+    description_md: Any = _UNSET,
+) -> MissionView:
+    with session_scope() as s:
+        m = s.get(Mission, mission_id)
+        if m is None or m.deleted_at is not None:
+            raise MissionNotFound()
+        if not viewer_is_admin and not _is_member(s, mission_id, viewer_id):
+            raise MissionNotFound()
+        if name is not None:
+            m.name = _normalize_name(name)
+        if client_target is not _UNSET:
+            m.client_target = _opt_str(client_target)
+        if date_start is not _UNSET:
+            m.date_start = date_start
+        if date_end is not _UNSET:
+            m.date_end = date_end
+        # Validate the combined date pair regardless of which side was passed.
+        _validate_dates(m.date_start, m.date_end)
+        if description_md is not _UNSET:
+            m.description_md = _opt_str(description_md)
+        s.flush()
+        s.refresh(m)
+        return _to_detail_view(s, m)
+
+
+def add_scenarios_to_mission(
+    mission_id: uuid.UUID,
+    scenario_template_ids: list[uuid.UUID],
+    *,
+    viewer_id: uuid.UUID,
+    viewer_is_admin: bool,
+) -> MissionView:
+    """Append more snapshot scenarios to an existing mission.
+
+    They land at `current_max_position + 1` and onwards. Empty list is a no-op
+    and just returns the current view.
+    """
+    with session_scope() as s:
+        m = s.get(Mission, mission_id)
+        if m is None or m.deleted_at is not None:
+            raise MissionNotFound()
+        if not viewer_is_admin and not _is_member(s, mission_id, viewer_id):
+            raise MissionNotFound()
+        if scenario_template_ids:
+            max_pos = s.scalar(
+                select(func.coalesce(func.max(MissionScenario.position), -1)).where(
+                    MissionScenario.mission_id == mission_id
+                )
+            )
+            _snapshot_scenarios(
+                s,
+                mission_id,
+                list(scenario_template_ids),
+                start_position=int(max_pos) + 1,
+            )
+        s.flush()
+        s.refresh(m)
+        return _to_detail_view(s, m)
+
+
+def set_mission_members(
+    mission_id: uuid.UUID,
+    members: list[MemberAssignment],
+    *,
+    viewer_id: uuid.UUID,
+    viewer_is_admin: bool,
+) -> MissionView:
+    """Replace the entire member set. Wipe + insert, like the scenario reorder."""
+    with session_scope() as s:
+        m = s.get(Mission, mission_id)
+        if m is None or m.deleted_at is not None:
+            raise MissionNotFound()
+        if not viewer_is_admin and not _is_member(s, mission_id, viewer_id):
+            raise MissionNotFound()
+        _validate_members(s, members)
+        for link in list(m.members):
+            s.delete(link)
+        s.flush()
+        for assignment in members:
+            s.add(
+                MissionMember(
+                    mission_id=m.id,
+                    user_id=assignment.user_id,
+                    role_hint=assignment.role_hint,
+                )
+            )
+        s.flush()
+        s.refresh(m)
+        return _to_detail_view(s, m)
+
+
+def transition_mission_status(
+    mission_id: uuid.UUID,
+    target_status: str,
+    *,
+    viewer_id: uuid.UUID,
+    viewer_is_admin: bool,
+) -> MissionView:
+    """Move the mission's status one step along the lifecycle graph."""
+    _validate_status(target_status)
+    with session_scope() as s:
+        m = s.get(Mission, mission_id)
+        if m is None or m.deleted_at is not None:
+            raise MissionNotFound()
+        if not viewer_is_admin and not _is_member(s, mission_id, viewer_id):
+            raise MissionNotFound()
+        if target_status == m.status:
+            # No-op transitions are valid: a client retry should not 409.
+            s.refresh(m)
+            return _to_detail_view(s, m)
+        allowed = _VALID_TRANSITIONS.get(m.status, frozenset())
+        if target_status not in allowed:
+            raise InvalidTransition(
+                f"cannot transition from {m.status!r} to {target_status!r}"
+            )
+        m.status = target_status
+        s.flush()
+        s.refresh(m)
+        return _to_detail_view(s, m)
+
+
+def soft_delete_mission(
+    mission_id: uuid.UUID,
+    *,
+    viewer_id: uuid.UUID,
+    viewer_is_admin: bool,
+) -> None:
+    with session_scope() as s:
+        m = s.get(Mission, mission_id)
+        if m is None or m.deleted_at is not None:
+            raise MissionNotFound()
+        if not viewer_is_admin and not _is_member(s, mission_id, viewer_id):
+            raise MissionNotFound()
+        m.deleted_at = datetime.now(tz=timezone.utc)

backend/tests/test_missions.py

@@ -0,0 +1,781 @@
+"""M6 — Mission CRUD, snapshot fidelity, membership visibility, transitions.
+
+The fixture stack mirrors `test_templates.py`: one shared `app` per module,
+fresh truncate at the start, a minimal MITRE bundle seeded for tag resolution,
+plus a small catalogue of test_templates and scenario_templates created via
+the admin API so the snapshot path is exercised end-to-end (not via raw ORM).
+"""
+
+from __future__ import annotations
+
+import json
+import secrets
+
+import pytest
+from sqlalchemy import text
+
+from app.core.install_token import regenerate_install_token
+from app.main import create_app
+from app.services import mitre_seed as mitre_svc
+
+
+def _truncate_all(engine):
+    with engine.begin() as conn:
+        # Order matches /diag/reset: missions before templates before MITRE.
+        conn.execute(
+            text(
+                "TRUNCATE mission_test_mitre_tags, mission_tests, "
+                "mission_scenarios, mission_categories, mission_members, "
+                "missions RESTART IDENTITY CASCADE"
+            )
+        )
+        conn.execute(
+            text(
+                "TRUNCATE scenario_template_tests, scenario_templates, "
+                "test_template_mitre_tags, test_templates "
+                "RESTART IDENTITY CASCADE"
+            )
+        )
+        conn.execute(
+            text(
+                "TRUNCATE users, refresh_tokens, invitations, invitation_groups, "
+                "user_groups, group_permissions, permissions, settings, groups "
+                "RESTART IDENTITY CASCADE"
+            )
+        )
+        conn.execute(
+            text(
+                "TRUNCATE mitre_technique_tactics, mitre_subtechniques, "
+                "mitre_techniques, mitre_tactics RESTART IDENTITY CASCADE"
+            )
+        )
+
+
+_MINIMAL_BUNDLE = {
+    "type": "bundle",
+    "id": "bundle--00000000-0000-0000-0000-000000000006",
+    "spec_version": "2.1",
+    "objects": [
+        {
+            "type": "x-mitre-tactic",
+            "id": "x-mitre-tactic--ta0002",
+            "name": "Execution",
+            "x_mitre_shortname": "execution",
+            "external_references": [
+                {"source_name": "mitre-attack", "external_id": "TA0002"}
+            ],
+        },
+        {
+            "type": "attack-pattern",
+            "id": "attack-pattern--t1059",
+            "name": "Command and Scripting Interpreter",
+            "kill_chain_phases": [
+                {"kill_chain_name": "mitre-attack", "phase_name": "execution"}
+            ],
+            "external_references": [
+                {"source_name": "mitre-attack", "external_id": "T1059"}
+            ],
+        },
+        {
+            "type": "attack-pattern",
+            "id": "attack-pattern--t1059-001",
+            "name": "PowerShell",
+            "x_mitre_is_subtechnique": True,
+            "external_references": [
+                {"source_name": "mitre-attack", "external_id": "T1059.001"}
+            ],
+        },
+        {
+            "type": "relationship",
+            "id": "relationship--rel1",
+            "relationship_type": "subtechnique-of",
+            "source_ref": "attack-pattern--t1059-001",
+            "target_ref": "attack-pattern--t1059",
+        },
+    ],
+}
+
+
+@pytest.fixture(scope="module")
+def app(db_engine_or_skip, tmp_path_factory):
+    _truncate_all(db_engine_or_skip)
+    bundle_path = tmp_path_factory.mktemp("m6") / "stix.json"
+    bundle_path.write_text(json.dumps(_MINIMAL_BUNDLE))
+    mitre_svc.seed_mitre(source=bundle_path, expected_sha256=None)
+    flask_app = create_app()
+    flask_app.config.update(TESTING=True)
+    return flask_app
+
+
+@pytest.fixture()
+def client(app):
+    return app.test_client()
+
+
+def _unique_email(prefix: str) -> str:
+    return f"{prefix}-{secrets.token_hex(4)}@metamorph.local"
+
+
+def _bearer(token: str) -> dict[str, str]:
+    return {"Authorization": f"Bearer {token}"}
+
+
+def _login(client, email: str, password: str) -> str:
+    r = client.post("/api/v1/auth/login", json={"email": email, "password": password})
+    assert r.status_code == 200, r.get_data(as_text=True)
+    return r.get_json()["access_token"]
+
+
+@pytest.fixture(scope="module")
+def admin(app):
+    token = regenerate_install_token()
+    email = _unique_email("admin")
+    password = "AdminPass1234!"
+    with app.test_client() as c:
+        r = c.post(
+            "/api/v1/setup",
+            json={"install_token": token, "email": email, "password": password},
+        )
+        assert r.status_code == 201, r.get_data(as_text=True)
+    return {"email": email, "password": password}
+
+
+@pytest.fixture()
+def admin_token(client, admin) -> str:
+    return _login(client, admin["email"], admin["password"])
+
+
+# ---------------------------------------------------------------- catalogue --
+
+
+def _mitre_kind(external_id: str) -> str:
+    if external_id.startswith("TA"):
+        return "tactic"
+    if "." in external_id:
+        return "subtechnique"
+    return "technique"
+
+
+def _make_test_template(client, admin_token: str, *, name: str, mitre: str = "T1059"):
+    body = {
+        "name": name,
+        "description": "auto",
+        "objective": "do thing",
+        "procedure_md": f"# {name}\n1. run",
+        "expected_result_red_md": "red expectation",
+        "expected_detection_blue_md": "blue expectation",
+        "opsec_level": "medium",
+        "tags": ["fast"],
+        "expected_iocs": ["evil.exe"],
+        "mitre_tags": [{"kind": _mitre_kind(mitre), "external_id": mitre}],
+    }
+    r = client.post("/api/v1/test-templates", headers=_bearer(admin_token), json=body)
+    assert r.status_code == 201, r.get_data(as_text=True)
+    return r.get_json()
+
+
+def _make_scenario(client, admin_token: str, *, name: str, test_ids: list[str]):
+    r = client.post(
+        "/api/v1/scenario-templates",
+        headers=_bearer(admin_token),
+        json={
+            "name": name,
+            "description": f"auto-{name}",
+            "test_template_ids": test_ids,
+        },
+    )
+    assert r.status_code == 201, r.get_data(as_text=True)
+    return r.get_json()
+
+
+@pytest.fixture(scope="module")
+def catalogue(app, admin):
+    """Pre-seeded templates + scenarios so tests can reference them by id."""
+    with app.test_client() as c:
+        tok = _login(c, admin["email"], admin["password"])
+        t1 = _make_test_template(c, tok, name="cat-test-1", mitre="T1059")
+        t2 = _make_test_template(
+            c, tok, name="cat-test-2", mitre="T1059.001"
+        )
+        t3 = _make_test_template(c, tok, name="cat-test-3", mitre="T1059")
+        sc_one = _make_scenario(
+            c, tok, name="cat-scenario-A", test_ids=[t1["id"], t2["id"], t3["id"]]
+        )
+        sc_solo = _make_scenario(c, tok, name="cat-scenario-B", test_ids=[t1["id"]])
+        return {
+            "tests": {"t1": t1, "t2": t2, "t3": t3},
+            "scenarios": {"a": sc_one, "b": sc_solo},
+        }
+
+
+# --------------------------------------------------------------------- users --
+
+
+def _invite_user(client, admin_token: str, prefix: str, group_codes: list[str]) -> dict:
+    """Invite a user pre-bound to a freshly-minted group with the listed perm codes."""
+    grp = client.post(
+        "/api/v1/groups",
+        headers=_bearer(admin_token),
+        json={"name": f"{prefix}-grp-{secrets.token_hex(2)}"},
+    ).get_json()
+    r_set = client.put(
+        f"/api/v1/groups/{grp['id']}/permissions",
+        headers=_bearer(admin_token),
+        json={"codes": group_codes},
+    )
+    assert r_set.status_code == 200, r_set.get_data(as_text=True)
+
+    email = _unique_email(prefix)
+    password = "Pass1234!"
+    inv = client.post(
+        "/api/v1/invitations",
+        headers=_bearer(admin_token),
+        json={"email_hint": email, "group_ids": [grp["id"]]},
+    )
+    assert inv.status_code == 201, inv.get_data(as_text=True)
+    accept_token = inv.get_json()["token"]
+    r = client.post(
+        f"/api/v1/invitations/accept/{accept_token}",
+        json={"email": email, "password": password},
+    )
+    assert r.status_code == 201, r.get_data(as_text=True)
+    me_token = _login(client, email, password)
+    me = client.get("/api/v1/auth/me", headers=_bearer(me_token)).get_json()
+    return {"email": email, "password": password, "token": me_token, "id": me["id"]}
+
+
+@pytest.fixture()
+def red_user(client, admin_token):
+    return _invite_user(
+        client,
+        admin_token,
+        "red",
+        [
+            "mission.read",
+            "mission.create",
+            "mission.update",
+            "mission.archive",
+            "mission.write_red_fields",
+        ],
+    )
+
+
+@pytest.fixture()
+def blue_user(client, admin_token):
+    return _invite_user(
+        client,
+        admin_token,
+        "blue",
+        ["mission.read", "mission.write_blue_fields"],
+    )
+
+
+@pytest.fixture()
+def reader_user(client, admin_token):
+    """A user with mission.read only — for "non-member can't see" checks."""
+    return _invite_user(client, admin_token, "reader", ["mission.read"])
+
+
+@pytest.fixture()
+def noperm_user(client, admin_token):
+    """A user with no mission perms at all."""
+    return _invite_user(client, admin_token, "noperm", [])
+
+
+# ================================================================ snapshot ==
+
+
+def test_create_mission_snapshots_scenarios_and_tests(client, admin_token, catalogue):
+    r = client.post(
+        "/api/v1/missions",
+        headers=_bearer(admin_token),
+        json={
+            "name": "snapshot-fidelity",
+            "client_target": "Acme Corp",
+            "description_md": "## ROE\n- approved\n",
+            "scenario_template_ids": [catalogue["scenarios"]["a"]["id"]],
+        },
+    )
+    assert r.status_code == 201, r.get_data(as_text=True)
+    body = r.get_json()
+    assert body["status"] == "draft"
+    assert body["visibility_mode"] == "whitebox"
+    assert body["scenarios_count"] == 1
+    assert body["tests_count"] == 3
+    assert body["members_count"] == 0  # admin creator is not auto-added
+    sc = body["scenarios"][0]
+    assert sc["position"] == 0
+    assert sc["snapshot_name"] == "cat-scenario-A"
+    names_in_order = [t["snapshot_name"] for t in sc["tests"]]
+    assert names_in_order == ["cat-test-1", "cat-test-2", "cat-test-3"]
+    # MITRE denormalised into the snapshot
+    t1 = next(t for t in sc["tests"] if t["snapshot_name"] == "cat-test-1")
+    kinds = [(tag["kind"], tag["external_id"]) for tag in t1["mitre_tags"]]
+    assert kinds == [("technique", "T1059")]
+
+
+def test_snapshot_is_frozen_after_template_edits(client, admin_token, catalogue):
+    create = client.post(
+        "/api/v1/missions",
+        headers=_bearer(admin_token),
+        json={
+            "name": "frozen-after-edits",
+            "scenario_template_ids": [catalogue["scenarios"]["b"]["id"]],
+        },
+    )
+    assert create.status_code == 201
+    mission_id = create.get_json()["id"]
+    # Mutate the source test_template: rename + change MITRE
+    edit = client.put(
+        f"/api/v1/test-templates/{catalogue['tests']['t1']['id']}",
+        headers=_bearer(admin_token),
+        json={
+            "name": "RENAMED-AFTER-SNAPSHOT",
+            "mitre_tags": [{"kind": "tactic", "external_id": "TA0002"}],
+        },
+    )
+    assert edit.status_code == 200
+    # Mission still sees the pre-edit snapshot
+    again = client.get(
+        f"/api/v1/missions/{mission_id}", headers=_bearer(admin_token)
+    ).get_json()
+    sc = again["scenarios"][0]
+    assert sc["tests"][0]["snapshot_name"] == "cat-test-1"
+    assert [(t["kind"], t["external_id"]) for t in sc["tests"][0]["mitre_tags"]] == [
+        ("technique", "T1059")
+    ]
+    # Revert the rename so other tests still find the original name
+    client.put(
+        f"/api/v1/test-templates/{catalogue['tests']['t1']['id']}",
+        headers=_bearer(admin_token),
+        json={
+            "name": "cat-test-1",
+            "mitre_tags": [{"kind": "technique", "external_id": "T1059"}],
+        },
+    )
+
+
+def test_create_mission_rejects_unknown_scenario(client, admin_token):
+    r = client.post(
+        "/api/v1/missions",
+        headers=_bearer(admin_token),
+        json={
+            "name": "bad-ref",
+            "scenario_template_ids": ["00000000-0000-0000-0000-000000000099"],
+        },
+    )
+    assert r.status_code == 400
+    assert r.get_json()["error"] == "unknown_scenario_template"
+
+
+def test_create_mission_rejects_soft_deleted_scenario(client, admin_token):
+    # Build a scenario, soft-delete it, then try to snapshot — must 400 with
+    # `unknown_scenario_template` so we don't silently freeze a tombstoned
+    # template into a new mission.
+    t = _make_test_template(client, admin_token, name="sd-rejection-t")
+    sc = client.post(
+        "/api/v1/scenario-templates",
+        headers=_bearer(admin_token),
+        json={"name": "sd-rejection-sc", "test_template_ids": [t["id"]]},
+    ).get_json()
+    del_r = client.delete(
+        f"/api/v1/scenario-templates/{sc['id']}", headers=_bearer(admin_token)
+    )
+    assert del_r.status_code == 200
+    r = client.post(
+        "/api/v1/missions",
+        headers=_bearer(admin_token),
+        json={
+            "name": "sd-rejection-mission",
+            "scenario_template_ids": [sc["id"]],
+        },
+    )
+    assert r.status_code == 400
+    assert r.get_json()["error"] == "unknown_scenario_template"
+
+
+def test_create_mission_validates_dates(client, admin_token):
+    r = client.post(
+        "/api/v1/missions",
+        headers=_bearer(admin_token),
+        json={
+            "name": "date-flip",
+            "date_start": "2026-06-01",
+            "date_end": "2026-05-01",
+        },
+    )
+    assert r.status_code == 400
+    assert "date_end" in r.get_json().get("message", "").lower()
+
+
+# =================================================== membership visibility ==
+
+
+def test_non_admin_creator_auto_added(client, red_user, catalogue):
+    r = client.post(
+        "/api/v1/missions",
+        headers=_bearer(red_user["token"]),
+        json={
+            "name": "red-self-created",
+            "scenario_template_ids": [catalogue["scenarios"]["b"]["id"]],
+        },
+    )
+    assert r.status_code == 201, r.get_data(as_text=True)
+    body = r.get_json()
+    assert body["members_count"] == 1
+    assert body["members"][0]["user_id"] == red_user["id"]
+    assert body["members"][0]["role_hint"] == "red"
+    # And the red user can see it back via /missions
+    r2 = client.get("/api/v1/missions", headers=_bearer(red_user["token"]))
+    ids = [it["id"] for it in r2.get_json()["items"]]
+    assert body["id"] in ids
+
+
+def test_non_admin_cannot_see_missions_they_are_not_members_of(
+    client, admin_token, reader_user, catalogue
+):
+    # Admin creates a mission with NO members
+    create = client.post(
+        "/api/v1/missions",
+        headers=_bearer(admin_token),
+        json={
+            "name": "hidden-from-reader",
+            "scenario_template_ids": [catalogue["scenarios"]["b"]["id"]],
+        },
+    )
+    assert create.status_code == 201
+    mid = create.get_json()["id"]
+    # Reader has mission.read but is not a member → empty list + 404
+    r_list = client.get("/api/v1/missions", headers=_bearer(reader_user["token"]))
+    ids = [it["id"] for it in r_list.get_json()["items"]]
+    assert mid not in ids
+    r_get = client.get(
+        f"/api/v1/missions/{mid}", headers=_bearer(reader_user["token"])
+    )
+    assert r_get.status_code == 404
+
+
+def test_non_member_get_returns_404_not_403(client, admin_token, reader_user):
+    """Existence leak guard: non-members should see 404, not 403."""
+    create = client.post(
+        "/api/v1/missions",
+        headers=_bearer(admin_token),
+        json={"name": "stealth-mission"},
+    )
+    mid = create.get_json()["id"]
+    r = client.get(f"/api/v1/missions/{mid}", headers=_bearer(reader_user["token"]))
+    assert r.status_code == 404
+
+
+# ===================================================== perm gating ==========
+
+
+def test_create_requires_mission_create_perm(client, blue_user):
+    """Blue team users (no mission.create) cannot create missions."""
+    r = client.post(
+        "/api/v1/missions",
+        headers=_bearer(blue_user["token"]),
+        json={"name": "no-perm"},
+    )
+    assert r.status_code == 403
+
+
+def test_list_requires_mission_read_perm(client, noperm_user):
+    r = client.get("/api/v1/missions", headers=_bearer(noperm_user["token"]))
+    assert r.status_code == 403
+
+
+def test_transition_perm_gate_runs_before_payload_parse(client, blue_user):
+    """A user without `mission.update` or `mission.archive` should see 403,
+    not 400, even when posting a malformed body — otherwise the endpoint's
+    shape leaks via the validation error message."""
+    # blue_user only has mission.read + mission.write_blue_fields, so neither
+    # mission.update nor mission.archive is held.
+    r = client.post(
+        "/api/v1/missions/00000000-0000-0000-0000-000000000000/transition",
+        headers=_bearer(blue_user["token"]),
+        json={"status": "garbage-not-a-valid-shape"},
+    )
+    assert r.status_code == 403
+
+
+def test_search_treats_wildcards_as_literals(client, admin_token):
+    """User-typed `%` and `_` must NOT act as SQL LIKE wildcards."""
+    client.post(
+        "/api/v1/missions",
+        headers=_bearer(admin_token),
+        json={"name": "no-wildcards-here"},
+    )
+    # Without escaping, `?q=%` would match every mission. With escaping, it
+    # only matches names that literally contain `%`.
+    r = client.get("/api/v1/missions?q=%25", headers=_bearer(admin_token))
+    assert r.status_code == 200
+    names = [it["name"] for it in r.get_json()["items"]]
+    assert "no-wildcards-here" not in names
+
+
+def test_archive_requires_mission_archive_not_just_update(client, admin_token):
+    """A user with mission.update but no mission.archive cannot archive."""
+    # blue_user only has mission.read + mission.write_blue_fields — no update either.
+    # We'll craft a user with update-only here.
+    update_only = _invite_user(client, admin_token, "u-only", ["mission.read", "mission.update"])
+    create = client.post(
+        "/api/v1/missions",
+        headers=_bearer(admin_token),
+        json={
+            "name": "to-archive",
+            "members": [{"user_id": update_only["id"], "role_hint": "red"}],
+        },
+    )
+    assert create.status_code == 201
+    mid = create.get_json()["id"]
+    # update-only can transition to in_progress (mission.update is enough)
+    r1 = client.post(
+        f"/api/v1/missions/{mid}/transition",
+        headers=_bearer(update_only["token"]),
+        json={"status": "in_progress"},
+    )
+    assert r1.status_code == 200
+    # … but cannot archive
+    r2 = client.post(
+        f"/api/v1/missions/{mid}/transition",
+        headers=_bearer(update_only["token"]),
+        json={"status": "archived"},
+    )
+    assert r2.status_code == 403
+
+
+# ==================================================== status transitions ==
+
+
+def test_valid_transition_chain(client, admin_token):
+    create = client.post(
+        "/api/v1/missions",
+        headers=_bearer(admin_token),
+        json={"name": "chain"},
+    )
+    mid = create.get_json()["id"]
+    for target in ("in_progress", "completed", "archived"):
+        r = client.post(
+            f"/api/v1/missions/{mid}/transition",
+            headers=_bearer(admin_token),
+            json={"status": target},
+        )
+        assert r.status_code == 200, (target, r.get_data(as_text=True))
+        assert r.get_json()["status"] == target
+
+
+def test_invalid_transition_409(client, admin_token):
+    create = client.post(
+        "/api/v1/missions",
+        headers=_bearer(admin_token),
+        json={"name": "invalid-jump"},
+    )
+    mid = create.get_json()["id"]
+    # draft → completed is not allowed (must pass through in_progress)
+    r = client.post(
+        f"/api/v1/missions/{mid}/transition",
+        headers=_bearer(admin_token),
+        json={"status": "completed"},
+    )
+    assert r.status_code == 409
+    assert r.get_json()["error"] == "invalid_transition"
+
+
+def test_unknown_target_status_400(client, admin_token):
+    create = client.post(
+        "/api/v1/missions",
+        headers=_bearer(admin_token),
+        json={"name": "bad-status"},
+    )
+    mid = create.get_json()["id"]
+    r = client.post(
+        f"/api/v1/missions/{mid}/transition",
+        headers=_bearer(admin_token),
+        json={"status": "delivered"},
+    )
+    assert r.status_code == 400
+
+
+def test_idempotent_same_status_transition(client, admin_token):
+    create = client.post(
+        "/api/v1/missions",
+        headers=_bearer(admin_token),
+        json={"name": "idempotent"},
+    )
+    mid = create.get_json()["id"]
+    r = client.post(
+        f"/api/v1/missions/{mid}/transition",
+        headers=_bearer(admin_token),
+        json={"status": "draft"},
+    )
+    assert r.status_code == 200
+    assert r.get_json()["status"] == "draft"
+
+
+# ============================================================ members =====
+
+
+def test_set_members_replaces_full_set(client, admin_token, red_user, blue_user):
+    create = client.post(
+        "/api/v1/missions",
+        headers=_bearer(admin_token),
+        json={
+            "name": "members-replace",
+            "members": [{"user_id": red_user["id"], "role_hint": "red"}],
+        },
+    )
+    mid = create.get_json()["id"]
+    r = client.put(
+        f"/api/v1/missions/{mid}/members",
+        headers=_bearer(admin_token),
+        json={"members": [{"user_id": blue_user["id"], "role_hint": "blue"}]},
+    )
+    assert r.status_code == 200, r.get_data(as_text=True)
+    body = r.get_json()
+    assert body["members_count"] == 1
+    assert body["members"][0]["user_id"] == blue_user["id"]
+    # And red can no longer see it
+    r_red = client.get(
+        f"/api/v1/missions/{mid}", headers=_bearer(red_user["token"])
+    )
+    assert r_red.status_code == 404
+
+
+def test_set_members_rejects_unknown_user(client, admin_token):
+    create = client.post(
+        "/api/v1/missions", headers=_bearer(admin_token), json={"name": "ghost-member"}
+    )
+    mid = create.get_json()["id"]
+    r = client.put(
+        f"/api/v1/missions/{mid}/members",
+        headers=_bearer(admin_token),
+        json={
+            "members": [
+                {
+                    "user_id": "00000000-0000-0000-0000-000000000123",
+                    "role_hint": "red",
+                }
+            ]
+        },
+    )
+    assert r.status_code == 400
+    assert r.get_json()["error"] == "unknown_user"
+
+
+def test_set_members_rejects_bad_role_hint(client, admin_token, red_user):
+    create = client.post(
+        "/api/v1/missions", headers=_bearer(admin_token), json={"name": "bad-hint"}
+    )
+    mid = create.get_json()["id"]
+    r = client.put(
+        f"/api/v1/missions/{mid}/members",
+        headers=_bearer(admin_token),
+        json={"members": [{"user_id": red_user["id"], "role_hint": "yellow"}]},
+    )
+    assert r.status_code == 400
+
+
+# ==================================================== add scenarios ======
+
+
+def test_add_scenarios_appends_at_end(client, admin_token, catalogue):
+    create = client.post(
+        "/api/v1/missions",
+        headers=_bearer(admin_token),
+        json={
+            "name": "appendable",
+            "scenario_template_ids": [catalogue["scenarios"]["b"]["id"]],
+        },
+    )
+    mid = create.get_json()["id"]
+    r = client.post(
+        f"/api/v1/missions/{mid}/scenarios",
+        headers=_bearer(admin_token),
+        json={"scenario_template_ids": [catalogue["scenarios"]["a"]["id"]]},
+    )
+    assert r.status_code == 200, r.get_data(as_text=True)
+    body = r.get_json()
+    assert body["scenarios_count"] == 2
+    positions = [sc["position"] for sc in body["scenarios"]]
+    assert positions == [0, 1]
+    # Second scenario lands at position 1
+    sc1 = next(sc for sc in body["scenarios"] if sc["position"] == 1)
+    assert sc1["snapshot_name"] == "cat-scenario-A"
+    assert len(sc1["tests"]) == 3
+
+
+# ============================================================= delete =====
+
+
+def test_soft_delete_hides_from_list(client, admin_token):
+    create = client.post(
+        "/api/v1/missions", headers=_bearer(admin_token), json={"name": "to-delete"}
+    )
+    mid = create.get_json()["id"]
+    r_del = client.delete(f"/api/v1/missions/{mid}", headers=_bearer(admin_token))
+    assert r_del.status_code == 200
+    r_list = client.get("/api/v1/missions", headers=_bearer(admin_token))
+    ids = [it["id"] for it in r_list.get_json()["items"]]
+    assert mid not in ids
+    # include_deleted=true brings it back (admin only)
+    r_list2 = client.get(
+        "/api/v1/missions?include_deleted=true", headers=_bearer(admin_token)
+    )
+    ids2 = [it["id"] for it in r_list2.get_json()["items"]]
+    assert mid in ids2
+
+
+def test_include_deleted_forbidden_for_non_admin(client, red_user):
+    r = client.get(
+        "/api/v1/missions?include_deleted=true", headers=_bearer(red_user["token"])
+    )
+    assert r.status_code == 403
+
+
+# ============================================================ update ======
+
+
+def test_update_metadata_partial(client, admin_token):
+    create = client.post(
+        "/api/v1/missions",
+        headers=_bearer(admin_token),
+        json={
+            "name": "to-rename",
+            "client_target": "X",
+            "date_start": "2026-06-01",
+            "date_end": "2026-06-10",
+        },
+    )
+    mid = create.get_json()["id"]
+    r = client.put(
+        f"/api/v1/missions/{mid}",
+        headers=_bearer(admin_token),
+        json={"name": "renamed", "client_target": None},
+    )
+    assert r.status_code == 200, r.get_data(as_text=True)
+    body = r.get_json()
+    assert body["name"] == "renamed"
+    assert body["client_target"] is None
+    # date fields untouched
+    assert body["date_start"] == "2026-06-01"
+    assert body["date_end"] == "2026-06-10"
+
+
+def test_update_rejects_inverted_dates(client, admin_token):
+    create = client.post(
+        "/api/v1/missions",
+        headers=_bearer(admin_token),
+        json={
+            "name": "invert",
+            "date_start": "2026-06-01",
+            "date_end": "2026-06-10",
+        },
+    )
+    mid = create.get_json()["id"]
+    r = client.put(
+        f"/api/v1/missions/{mid}",
+        headers=_bearer(admin_token),
+        json={"date_end": "2026-05-01"},
+    )
+    assert r.status_code == 400

e2e/tests/m6-missions.spec.ts

@@ -0,0 +1,405 @@
+import { expect, test, type APIRequestContext, type Page } from '@playwright/test';
+
+/**
+ * M6 — Mission CRUD, snapshot fidelity, membership visibility, transitions.
+ *
+ * The suite covers:
+ *  - Snapshot independence (mutating a template after mission creation must NOT
+ *    propagate into the mission's snapshot).
+ *  - Membership visibility (non-admin viewers see only their own missions).
+ *  - Status transition state machine (draft → in_progress → completed → archived).
+ *  - SPA: list + 3-step create wizard + detail page tabs.
+ *
+ * Template + MITRE seed are pulled in `beforeAll`; the `afterAll` hook restores
+ * the stable admin (memory rule `feedback-metamorph-test-admin`) and re-seeds
+ * MITRE so subsequent manual sessions don't see an empty matrix.
+ */
+
+const ADMIN_EMAIL = `m6-admin-${crypto.randomUUID().slice(0, 8)}@metamorph.local`;
+const ADMIN_PASSWORD = 'AdminPass1234!';
+
+async function resetAndMintToken(request: APIRequestContext): Promise<string> {
+  const r = await request.post('/api/v1/diag/reset');
+  expect(r.status()).toBe(200);
+  return (await r.json()).install_token as string;
+}
+
+async function loginAndGetAccess(
+  request: APIRequestContext,
+  email: string,
+  password: string,
+): Promise<string> {
+  const r = await request.post('/api/v1/auth/login', { data: { email, password } });
+  expect(r.status()).toBe(200);
+  return (await r.json()).access_token as string;
+}
+
+async function loginViaSpa(page: Page, email: string, password: string) {
+  await page.goto('/login');
+  await page.getByLabel(/email/i).fill(email);
+  await page.getByLabel(/password/i).fill(password);
+  await page.getByRole('button', { name: /sign in/i }).click();
+  await expect(page.getByTestId('me-email')).toHaveText(email);
+}
+
+test.describe.configure({ mode: 'serial' });
+
+test.describe('M6 — Missions', () => {
+  test.beforeAll(async ({ request }) => {
+    const installToken = await resetAndMintToken(request);
+    const setup = await request.post('/api/v1/setup', {
+      data: { install_token: installToken, email: ADMIN_EMAIL, password: ADMIN_PASSWORD },
+    });
+    expect(setup.status()).toBe(201);
+    const access = await loginAndGetAccess(request, ADMIN_EMAIL, ADMIN_PASSWORD);
+    const sync = await request.post('/api/v1/mitre/sync', {
+      headers: { Authorization: `Bearer ${access}` },
+    });
+    expect(sync.status()).toBe(200);
+  });
+
+  test.afterAll(async ({ request }) => {
+    const installToken = await resetAndMintToken(request);
+    await request.post('/api/v1/setup', {
+      data: {
+        install_token: installToken,
+        email: 'admin@metamorph.local',
+        password: 'AdminPass1234!',
+      },
+    });
+    const access = await loginAndGetAccess(request, 'admin@metamorph.local', 'AdminPass1234!');
+    await request.post('/api/v1/mitre/sync', {
+      headers: { Authorization: `Bearer ${access}` },
+    });
+  });
+
+  // ---------- helpers ----------------------------------------------------
+
+  async function adminAuth(request: APIRequestContext): Promise<Record<string, string>> {
+    const access = await loginAndGetAccess(request, ADMIN_EMAIL, ADMIN_PASSWORD);
+    return { Authorization: `Bearer ${access}` };
+  }
+
+  async function makeTest(
+    request: APIRequestContext,
+    auth: Record<string, string>,
+    name: string,
+    mitre = 'T1059',
+  ): Promise<string> {
+    const r = await request.post('/api/v1/test-templates', {
+      headers: auth,
+      data: {
+        name,
+        mitre_tags: [{ kind: 'technique', external_id: mitre }],
+      },
+    });
+    expect(r.status(), await r.text()).toBe(201);
+    return (await r.json()).id as string;
+  }
+
+  async function makeScenario(
+    request: APIRequestContext,
+    auth: Record<string, string>,
+    name: string,
+    testIds: string[],
+  ): Promise<string> {
+    const r = await request.post('/api/v1/scenario-templates', {
+      headers: auth,
+      data: { name, test_template_ids: testIds },
+    });
+    expect(r.status(), await r.text()).toBe(201);
+    return (await r.json()).id as string;
+  }
+
+  // ---------- API: snapshot fidelity ------------------------------------
+
+  test('Snapshot freezes scenario + test fields at creation time', async ({ request }) => {
+    const auth = await adminAuth(request);
+    const tid = await makeTest(request, auth, 'snap-t1');
+    const sid = await makeScenario(request, auth, 'snap-scenario', [tid]);
+
+    const create = await request.post('/api/v1/missions', {
+      headers: auth,
+      data: {
+        name: 'snap-mission',
+        client_target: 'Acme',
+        scenario_template_ids: [sid],
+      },
+    });
+    expect(create.status(), await create.text()).toBe(201);
+    const mission = await create.json();
+    expect(mission.scenarios_count).toBe(1);
+    expect(mission.tests_count).toBe(1);
+    expect(mission.scenarios[0].tests[0].snapshot_name).toBe('snap-t1');
+
+    // Mutate the source template AFTER snapshot
+    const edit = await request.put(`/api/v1/test-templates/${tid}`, {
+      headers: auth,
+      data: {
+        name: 'RENAMED-LATER',
+        mitre_tags: [{ kind: 'tactic', external_id: 'TA0002' }],
+      },
+    });
+    expect(edit.status()).toBe(200);
+
+    // Mission still sees the pre-edit snapshot
+    const refetch = await request.get(`/api/v1/missions/${mission.id}`, { headers: auth });
+    expect(refetch.status()).toBe(200);
+    const snapshot = await refetch.json();
+    expect(snapshot.scenarios[0].tests[0].snapshot_name).toBe('snap-t1');
+    expect(
+      snapshot.scenarios[0].tests[0].mitre_tags.map(
+        (t: { external_id: string }) => t.external_id,
+      ),
+    ).toEqual(['T1059']);
+  });
+
+  // ---------- API: membership visibility --------------------------------
+
+  test('Non-admin members see only missions they belong to', async ({ request }) => {
+    const auth = await adminAuth(request);
+
+    // Create a group with mission.* perms and invite a "red" user.
+    const grp = await request
+      .post('/api/v1/groups', { headers: auth, data: { name: 'm6-red-grp' } })
+      .then((r) => r.json());
+    const setPerms = await request.put(`/api/v1/groups/${grp.id}/permissions`, {
+      headers: auth,
+      data: {
+        codes: ['mission.read', 'mission.create', 'mission.update', 'mission.archive'],
+      },
+    });
+    expect(setPerms.status()).toBe(200);
+
+    const redEmail = `m6-red-${crypto.randomUUID().slice(0, 8)}@metamorph.local`;
+    const redPwd = 'RedPass1234!';
+    const inv = await request
+      .post('/api/v1/invitations', {
+        headers: auth,
+        data: { email_hint: redEmail, group_ids: [grp.id] },
+      })
+      .then((r) => r.json());
+    const accept = await request.post(`/api/v1/invitations/accept/${inv.token}`, {
+      data: { email: redEmail, password: redPwd },
+    });
+    expect(accept.status()).toBe(201);
+
+    const redAccess = await loginAndGetAccess(request, redEmail, redPwd);
+    const redAuth = { Authorization: `Bearer ${redAccess}` };
+
+    // Admin creates a mission with NO members → red should not see it.
+    const hidden = await request
+      .post('/api/v1/missions', {
+        headers: auth,
+        data: { name: 'm6-admin-hidden' },
+      })
+      .then((r) => r.json());
+    const redList = await request.get('/api/v1/missions', { headers: redAuth });
+    expect(redList.status()).toBe(200);
+    const visible = (await redList.json()).items.map((it: { name: string }) => it.name);
+    expect(visible).not.toContain('m6-admin-hidden');
+    const redGetHidden = await request.get(`/api/v1/missions/${hidden.id}`, {
+      headers: redAuth,
+    });
+    expect(redGetHidden.status()).toBe(404);
+
+    // Red creates their own mission — auto-added as member → visible to them.
+    const ownResp = await request.post('/api/v1/missions', {
+      headers: redAuth,
+      data: { name: 'm6-red-own' },
+    });
+    expect(ownResp.status(), await ownResp.text()).toBe(201);
+    const own = await ownResp.json();
+    expect(own.members.map((m: { user_id: string }) => m.user_id)).toContain(
+      own.members[0].user_id,
+    );
+    const redListAfter = await request.get('/api/v1/missions', { headers: redAuth });
+    const namesAfter = (await redListAfter.json()).items.map(
+      (it: { name: string }) => it.name,
+    );
+    expect(namesAfter).toContain('m6-red-own');
+  });
+
+  // ---------- API: transitions ------------------------------------------
+
+  test('Status transition chain and rejection of invalid jumps', async ({ request }) => {
+    const auth = await adminAuth(request);
+    const m = await request
+      .post('/api/v1/missions', {
+        headers: auth,
+        data: { name: 'm6-status-chain' },
+      })
+      .then((r) => r.json());
+
+    for (const target of ['in_progress', 'completed', 'archived']) {
+      const r = await request.post(`/api/v1/missions/${m.id}/transition`, {
+        headers: auth,
+        data: { status: target },
+      });
+      expect(r.status(), await r.text()).toBe(200);
+      expect((await r.json()).status).toBe(target);
+    }
+
+    // Re-create + try an invalid jump draft → completed (must be 409)
+    const m2 = await request
+      .post('/api/v1/missions', {
+        headers: auth,
+        data: { name: 'm6-status-jump' },
+      })
+      .then((r) => r.json());
+    const bad = await request.post(`/api/v1/missions/${m2.id}/transition`, {
+      headers: auth,
+      data: { status: 'completed' },
+    });
+    expect(bad.status()).toBe(409);
+    expect((await bad.json()).error).toBe('invalid_transition');
+  });
+
+  // ---------- SPA -------------------------------------------------------
+
+  test('SPA — admin creates a mission via the 3-step wizard', async ({ page, request }) => {
+    const auth = await adminAuth(request);
+    const ids: string[] = [];
+    for (const name of ['spa-wizard-t1', 'spa-wizard-t2', 'spa-wizard-t3']) {
+      ids.push(await makeTest(request, auth, name));
+    }
+    const sid = await makeScenario(request, auth, 'spa-wizard-scenario', ids);
+
+    await loginViaSpa(page, ADMIN_EMAIL, ADMIN_PASSWORD);
+    await page.goto('/missions');
+    await page.getByTestId('missions-new-link').click();
+    await expect(page).toHaveURL(/\/missions\/new$/);
+
+    // Step 1 — Metadata
+    await page.getByTestId('meta-name').fill('spa-wizard-mission');
+    await page.getByTestId('meta-client').fill('Acme via SPA');
+    await page.getByTestId('missions-create-next').click();
+
+    // Step 2 — Scenarios
+    await page.getByTestId(`scenario-toggle-${sid}`).click();
+    await page.getByTestId('missions-create-next').click();
+
+    // Step 3 — Members (admin doesn't need to add themselves; submit straight away)
+    await page.getByTestId('missions-create-submit').click();
+
+    // Should land on the detail page
+    await expect(page).toHaveURL(/\/missions\/[0-9a-f-]+$/);
+    await expect(page.getByTestId('mission-transition-in_progress')).toBeVisible();
+    await expect(page.getByTestId('mission-tab-tests')).toBeVisible();
+    // Tests tab renders 3 snapshotted tests
+    await expect(page.getByText('spa-wizard-t1')).toBeVisible();
+    await expect(page.getByText('spa-wizard-t2')).toBeVisible();
+    await expect(page.getByText('spa-wizard-t3')).toBeVisible();
+  });
+
+  test('SPA — detail page edits metadata, appends scenarios, edits members', async ({
+    page,
+    request,
+  }) => {
+    const auth = await adminAuth(request);
+
+    // Pre-seed: one mission with one initial scenario; a second scenario to
+    // append; and a second user we can assign as a member from the SPA.
+    const initialTestId = await makeTest(request, auth, 'spa-edit-initial-t');
+    const initialScenarioId = await makeScenario(
+      request,
+      auth,
+      'spa-edit-initial-scenario',
+      [initialTestId],
+    );
+    const extraTestId = await makeTest(request, auth, 'spa-edit-appended-t');
+    const extraScenarioId = await makeScenario(
+      request,
+      auth,
+      'spa-edit-appended-scenario',
+      [extraTestId],
+    );
+    const mission = await request
+      .post('/api/v1/missions', {
+        headers: auth,
+        data: {
+          name: 'spa-edit-target',
+          client_target: 'Initial Co.',
+          scenario_template_ids: [initialScenarioId],
+        },
+      })
+      .then((r) => r.json());
+
+    // A second user the admin can add as a member via the modal.
+    const teammateEmail = `spa-edit-mate-${crypto.randomUUID().slice(0, 8)}@metamorph.local`;
+    const inv = await request
+      .post('/api/v1/invitations', {
+        headers: auth,
+        data: { email_hint: teammateEmail },
+      })
+      .then((r) => r.json());
+    await request.post(`/api/v1/invitations/accept/${inv.token}`, {
+      data: { email: teammateEmail, password: 'MatePass1234!' },
+    });
+
+    await loginViaSpa(page, ADMIN_EMAIL, ADMIN_PASSWORD);
+    await page.goto(`/missions/${mission.id}`);
+    await expect(page.getByText('Initial Co.')).toBeVisible();
+
+    // --- Edit metadata --------------------------------------------------
+    await page.getByTestId('mission-edit-meta').click();
+    const metaModal = page.getByTestId('mission-edit-meta-modal');
+    await expect(metaModal).toBeVisible();
+    await metaModal.getByTestId('meta-edit-client').fill('Renamed Co.');
+    await metaModal.getByTestId('meta-edit-save').click();
+    await expect(metaModal).toBeHidden();
+    await expect(page.getByText('Renamed Co.')).toBeVisible();
+
+    // --- Append a scenario ---------------------------------------------
+    await page.getByTestId('mission-add-scenarios').click();
+    const addModal = page.getByTestId('mission-add-scenarios-modal');
+    await expect(addModal).toBeVisible();
+    await addModal.getByTestId(`add-scenario-toggle-${extraScenarioId}`).click();
+    await addModal.getByTestId('add-scenarios-save').click();
+    await expect(addModal).toBeHidden();
+    // Both scenarios now visible in the Tests tab
+    await expect(page.getByText('spa-edit-initial-scenario')).toBeVisible();
+    await expect(page.getByText('spa-edit-appended-scenario')).toBeVisible();
+    await expect(page.getByText('spa-edit-appended-t')).toBeVisible();
+
+    // --- Edit members ---------------------------------------------------
+    await page.getByTestId('mission-tab-members').click();
+    await page.getByTestId('mission-edit-members').click();
+    const memModal = page.getByTestId('mission-edit-members-modal');
+    await expect(memModal).toBeVisible();
+    // The roster row test-ids encode the new user's id; we don't know it here
+    // but the email is unique, so locate the row by email text and toggle red.
+    const teammateRow = memModal.getByText(teammateEmail).locator('..').locator('..');
+    await teammateRow.getByRole('button', { name: /red/i }).click();
+    await memModal.getByTestId('edit-members-save').click();
+    await expect(memModal).toBeHidden();
+    await expect(page.getByText(teammateEmail)).toBeVisible();
+  });
+
+  test('SPA — list page filters by status', async ({ page, request }) => {
+    const auth = await adminAuth(request);
+    // Seed two missions with distinct statuses.
+    const m1 = await request
+      .post('/api/v1/missions', { headers: auth, data: { name: 'filter-draft' } })
+      .then((r) => r.json());
+    const m2 = await request
+      .post('/api/v1/missions', { headers: auth, data: { name: 'filter-active' } })
+      .then((r) => r.json());
+    await request.post(`/api/v1/missions/${m2.id}/transition`, {
+      headers: auth,
+      data: { status: 'in_progress' },
+    });
+
+    await loginViaSpa(page, ADMIN_EMAIL, ADMIN_PASSWORD);
+    await page.goto('/missions');
+    await expect(page.getByText('filter-draft')).toBeVisible();
+    await expect(page.getByText('filter-active')).toBeVisible();
+
+    await page.getByTestId('missions-filter-status').selectOption('in_progress');
+    await expect(page.getByText('filter-active')).toBeVisible();
+    await expect(page.getByText('filter-draft')).toBeHidden();
+    // Sanity: m1 / m2 ids should match what the list-card test-id encodes.
+    await expect(page.getByTestId(`mission-card-${m2.id}`)).toBeVisible();
+    await expect(page.getByTestId(`mission-card-${m1.id}`)).toBeHidden();
+  });
+});

frontend/src/App.tsx

@@ -12,6 +12,9 @@ import { AdminUsersPage } from '@/pages/AdminUsersPage';
 import { HomePage } from '@/pages/HomePage';
 import { MitrePage } from '@/pages/MitrePage';
 import { LoginPage } from '@/pages/LoginPage';
+import { MissionDetailPage } from '@/pages/MissionDetailPage';
+import { MissionsCreatePage } from '@/pages/MissionsCreatePage';
+import { MissionsListPage } from '@/pages/MissionsListPage';
 import { ProfilePage } from '@/pages/ProfilePage';
 import { RegisterPage } from '@/pages/RegisterPage';
 import { SetupPage } from '@/pages/SetupPage';
@@ -60,6 +63,30 @@ function App() {
                   </RequireAuth>
                 }
               />
+              <Route
+                path="/missions"
+                element={
+                  <RequireAuth>
+                    <MissionsListPage />
+                  </RequireAuth>
+                }
+              />
+              <Route
+                path="/missions/new"
+                element={
+                  <RequireAuth>
+                    <MissionsCreatePage />
+                  </RequireAuth>
+                }
+              />
+              <Route
+                path="/missions/:id"
+                element={
+                  <RequireAuth>
+                    <MissionDetailPage />
+                  </RequireAuth>
+                }
+              />
               <Route
                 path="/admin/users"
                 element={

frontend/src/components/Layout.tsx

@@ -37,6 +37,9 @@ export function Layout() {
                 {navItem('/', 'Home')}
                 {navItem('/profile', 'Profile')}
                 {navItem('/mitre', 'MITRE')}
+                {(state.user.is_admin ||
+                  state.user.permissions.includes('mission.read')) &&
+                  navItem('/missions', 'Missions')}
                 {state.user.is_admin && (
                   <>
                     {navItem('/admin/users', 'Users')}
@@ -71,7 +74,7 @@ export function Layout() {
         <Outlet />
 
         <footer className="mt-[60px] py-8 border-t border-border text-center font-mono text-xs text-text-dim">
-          metamorph · M0 bootstrap · M1 db schema · M2 auth · M3 rbac · M4 mitre · M5 templates · design system from tasks/design.md
+          metamorph · M0 bootstrap · M1 db schema · M2 auth · M3 rbac · M4 mitre · M5 templates · M6 missions · design system from tasks/design.md
         </footer>
       </div>
     </div>

frontend/src/lib/missions.ts

@@ -0,0 +1,167 @@
+/**
+ * Mission types + query-key factory.
+ *
+ * A mission is a *snapshot* of one or more scenario templates: the backend
+ * copies template fields into mission_* tables at creation time, and template
+ * edits after that point do not propagate. Types here mirror the server-side
+ * dataclasses in `app/services/missions.py`.
+ */
+
+export type MissionStatus = 'draft' | 'in_progress' | 'completed' | 'archived';
+export type MissionRoleHint = 'red' | 'blue';
+export type MissionTestState =
+  | 'pending'
+  | 'executed'
+  | 'reviewed_by_blue'
+  | 'skipped'
+  | 'blocked';
+export type MissionVisibilityMode = 'whitebox' | 'titles_only' | 'executed_only';
+export type MissionMitreKind = 'tactic' | 'technique' | 'subtechnique';
+export type MissionOpsecLevel = 'low' | 'medium' | 'high';
+
+export interface MissionMember {
+  user_id: string;
+  user_email: string;
+  user_display_name: string | null;
+  role_hint: MissionRoleHint;
+}
+
+export interface MissionMitreTag {
+  kind: MissionMitreKind;
+  external_id: string;
+  name: string;
+  url: string | null;
+}
+
+export interface MissionTest {
+  id: string;
+  position: number;
+  snapshot_name: string;
+  snapshot_description: string | null;
+  snapshot_objective: string | null;
+  snapshot_procedure_md: string | null;
+  snapshot_prerequisites_md: string | null;
+  snapshot_expected_red_md: string | null;
+  snapshot_expected_blue_md: string | null;
+  snapshot_opsec_level: MissionOpsecLevel;
+  snapshot_tags: string[];
+  snapshot_expected_iocs: string[];
+  state: MissionTestState;
+  executed_at: string | null;
+  executed_at_overridden: boolean;
+  mitre_tags: MissionMitreTag[];
+  source_test_template_id: string | null;
+}
+
+export interface MissionScenario {
+  id: string;
+  position: number;
+  snapshot_name: string;
+  snapshot_description: string | null;
+  tests: MissionTest[];
+  source_scenario_template_id: string | null;
+}
+
+export interface MissionListItem {
+  id: string;
+  name: string;
+  client_target: string | null;
+  date_start: string | null;
+  date_end: string | null;
+  status: MissionStatus;
+  description_md: string | null;
+  visibility_mode: MissionVisibilityMode;
+  scenarios_count: number;
+  tests_count: number;
+  members_count: number;
+  deleted_at: string | null;
+  created_at: string;
+  updated_at: string;
+}
+
+export interface Mission extends MissionListItem {
+  scenarios: MissionScenario[];
+  members: MissionMember[];
+}
+
+export interface MissionListResponse {
+  items: MissionListItem[];
+  total: number;
+  limit: number;
+  offset: number;
+}
+
+export interface MissionFilters {
+  q?: string;
+  status?: MissionStatus | '';
+  client?: string;
+}
+
+export interface MemberPayload {
+  user_id: string;
+  role_hint: MissionRoleHint;
+}
+
+export interface CreateMissionPayload {
+  name: string;
+  client_target?: string | null;
+  date_start?: string | null;
+  date_end?: string | null;
+  description_md?: string | null;
+  scenario_template_ids?: string[];
+  members?: MemberPayload[];
+}
+
+export interface UpdateMissionPayload {
+  name?: string;
+  client_target?: string | null;
+  date_start?: string | null;
+  date_end?: string | null;
+  description_md?: string | null;
+}
+
+export interface AddScenariosPayload {
+  scenario_template_ids: string[];
+}
+
+export interface SetMembersPayload {
+  members: MemberPayload[];
+}
+
+export interface TransitionPayload {
+  status: MissionStatus;
+}
+
+export const missionKeys = {
+  /** Prefix-only key — pass this to `invalidateQueries` to refresh every
+   * filtered variant. Matching is prefix-based: `['missions','list',{q:'x'}]`
+   * also gets invalidated.
+   */
+  listPrefix: () => ['missions', 'list'] as const,
+  list: (filters?: MissionFilters) => ['missions', 'list', filters ?? {}] as const,
+  detail: (id: string) => ['missions', 'detail', id] as const,
+};
+
+export function buildMissionQueryString(filters: MissionFilters | undefined): string {
+  if (!filters) return '';
+  const params = new URLSearchParams();
+  if (filters.q) params.set('q', filters.q);
+  if (filters.status) params.set('status', filters.status);
+  if (filters.client) params.set('client', filters.client);
+  const s = params.toString();
+  return s ? `?${s}` : '';
+}
+
+export const MISSION_STATUS_ACCENT: Record<MissionStatus, 'cyan' | 'orange' | 'green' | 'teal'> = {
+  draft: 'cyan',
+  in_progress: 'orange',
+  completed: 'green',
+  archived: 'teal',
+};
+
+export const MISSION_STATUS_LABEL: Record<MissionStatus, string> = {
+  draft: 'Draft',
+  in_progress: 'In Progress',
+  completed: 'Completed',
+  archived: 'Archived',
+};

frontend/src/pages/HomePage.tsx

@@ -61,7 +61,7 @@ export function HomePage() {
           <span className="text-purple">Purple Team Platform</span>
         </h1>
         <p className="font-mono text-sm font-light text-text-dim mt-2">
-          Collaborative red &amp; blue test orchestration — M4 milestone (MITRE ATT&amp;CK)
+          Collaborative red &amp; blue test orchestration — M6 milestone (Missions &amp; snapshot)
         </p>
       </header>
       <SectionHeader
@@ -141,9 +141,9 @@ export function HomePage() {
 
         <Card accent="purple" title="Roadmap" sub="14 milestones">
           <p>
-            M0 + M1 + M2 + M3 + M4 done. Next:{' '}
+            M0 + M1 + M2 + M3 + M4 + M5 + M6 done. Next:{' '}
             <code className="accent-fill-cyan px-2 py-[2px] rounded-sm font-mono text-4xs">
-              M5 — Test &amp; scenario templates
+              M7 — Red &amp; blue execution on a mission test
             </code>
             .
           </p>

frontend/src/pages/MissionDetailPage.tsx

@@ -0,0 +1,807 @@
+import { useMutation, useQuery, useQueryClient } from '@tanstack/react-query';
+import { useEffect, useMemo, useState } from 'react';
+import { useNavigate, useParams } from 'react-router-dom';
+
+import { MarkdownField } from '@/components/MarkdownField';
+import { Alert } from '@/components/ui/Alert';
+import { Button } from '@/components/ui/Button';
+import { Card } from '@/components/ui/Card';
+import { Modal } from '@/components/ui/Modal';
+import { SectionHeader } from '@/components/ui/SectionHeader';
+import { Tag } from '@/components/ui/Tag';
+import { TextField } from '@/components/ui/TextField';
+import { ApiError, apiDelete, apiGet, apiPost, apiPut } from '@/lib/api';
+import { useAuth } from '@/lib/auth';
+import {
+  MISSION_STATUS_ACCENT,
+  MISSION_STATUS_LABEL,
+  missionKeys,
+  type AddScenariosPayload,
+  type MemberPayload,
+  type Mission,
+  type MissionRoleHint,
+  type MissionStatus,
+  type SetMembersPayload,
+  type TransitionPayload,
+  type UpdateMissionPayload,
+} from '@/lib/missions';
+import type {
+  ScenarioTemplate,
+  ScenarioTemplateListResponse,
+} from '@/lib/templates';
+import { templateKeys } from '@/lib/templates';
+
+const TABS = ['tests', 'members', 'synthesis', 'export'] as const;
+type Tab = (typeof TABS)[number];
+
+const ALLOWED_TRANSITIONS: Record<MissionStatus, MissionStatus[]> = {
+  draft: ['in_progress', 'archived'],
+  in_progress: ['completed', 'archived'],
+  completed: ['archived'],
+  archived: [],
+};
+
+const TRANSITION_BUTTON_ACCENT: Record<MissionStatus, 'cyan' | 'orange' | 'green' | 'teal'> = {
+  draft: 'cyan',
+  in_progress: 'orange',
+  completed: 'green',
+  archived: 'teal',
+};
+
+interface RosterUser {
+  id: string;
+  email: string;
+  display_name: string | null;
+}
+
+interface RosterResponse {
+  items: RosterUser[];
+}
+
+interface MemberSelection {
+  user_id: string;
+  role_hint: MissionRoleHint;
+}
+
+function useMission(id: string) {
+  return useQuery({
+    queryKey: missionKeys.detail(id),
+    queryFn: () => apiGet<Mission>(`/missions/${id}`),
+    enabled: !!id,
+  });
+}
+
+function useScenarioCatalogue(enabled: boolean) {
+  return useQuery({
+    queryKey: templateKeys.scenarios(''),
+    queryFn: () =>
+      apiGet<ScenarioTemplateListResponse>('/scenario-templates?limit=500'),
+    enabled,
+  });
+}
+
+function useRoster(enabled: boolean) {
+  return useQuery({
+    queryKey: ['users', 'roster'],
+    queryFn: () => apiGet<RosterResponse>('/users/roster'),
+    enabled,
+  });
+}
+
+function formatDateRange(start: string | null, end: string | null): string {
+  if (!start && !end) return 'No dates set';
+  if (start && end) return `${start} → ${end}`;
+  return start ?? end ?? '';
+}
+
+// --------------------------------------------------------------------------- //
+// Metadata edit modal                                                         //
+// --------------------------------------------------------------------------- //
+
+interface MetaEditModalProps {
+  mission: Mission;
+  open: boolean;
+  onClose: () => void;
+}
+
+function MetaEditModal({ mission, open, onClose }: MetaEditModalProps) {
+  const qc = useQueryClient();
+  const [name, setName] = useState(mission.name);
+  const [client, setClient] = useState(mission.client_target ?? '');
+  const [dateStart, setDateStart] = useState(mission.date_start ?? '');
+  const [dateEnd, setDateEnd] = useState(mission.date_end ?? '');
+  const [description, setDescription] = useState(mission.description_md ?? '');
+
+  // Reset form whenever the modal opens with a (potentially newer) mission.
+  useEffect(() => {
+    if (!open) return;
+    setName(mission.name);
+    setClient(mission.client_target ?? '');
+    setDateStart(mission.date_start ?? '');
+    setDateEnd(mission.date_end ?? '');
+    setDescription(mission.description_md ?? '');
+  }, [open, mission]);
+
+  const update = useMutation({
+    mutationFn: (body: UpdateMissionPayload) =>
+      apiPut<Mission>(`/missions/${mission.id}`, body),
+    onSuccess: () => {
+      qc.invalidateQueries({ queryKey: missionKeys.detail(mission.id) });
+      qc.invalidateQueries({ queryKey: missionKeys.listPrefix() });
+      onClose();
+    },
+  });
+
+  const apiErr = update.error instanceof ApiError ? update.error : null;
+  const nameInvalid = name.trim().length === 0;
+  const datesInvalid = dateStart && dateEnd && dateEnd < dateStart;
+
+  function submit() {
+    update.mutate({
+      name: name.trim(),
+      client_target: client.trim() || null,
+      date_start: dateStart || null,
+      date_end: dateEnd || null,
+      description_md: description.trim() || null,
+    });
+  }
+
+  return (
+    <Modal
+      open={open}
+      onClose={onClose}
+      title={mission.name}
+      accent="cyan"
+      size="3xl"
+      testid="mission-edit-meta-modal"
+    >
+      <div className="flex flex-col gap-3 min-w-0">
+        {apiErr && <Alert accent="red">{apiErr.message}</Alert>}
+        <div className="grid grid-cols-1 gap-3 md:grid-cols-2">
+          <TextField
+            label="Name"
+            required
+            value={name}
+            onChange={(e) => setName(e.target.value)}
+            data-testid="meta-edit-name"
+          />
+          <TextField
+            label="Client / target"
+            value={client}
+            onChange={(e) => setClient(e.target.value)}
+            data-testid="meta-edit-client"
+          />
+          <TextField
+            label="Start date"
+            type="date"
+            value={dateStart}
+            onChange={(e) => setDateStart(e.target.value)}
+            data-testid="meta-edit-date-start"
+          />
+          <TextField
+            label="End date"
+            type="date"
+            value={dateEnd}
+            onChange={(e) => setDateEnd(e.target.value)}
+            data-testid="meta-edit-date-end"
+          />
+        </div>
+        <MarkdownField
+          label="ROE / Description"
+          value={description}
+          onChange={setDescription}
+          data-testid="meta-edit-description"
+        />
+        {datesInvalid && (
+          <p className="font-mono text-2xs text-red" data-testid="meta-edit-date-error">
+            End date must be on or after start date.
+          </p>
+        )}
+        <div className="flex items-center justify-end gap-2 pt-2">
+          <Button accent="teal" variant="ghost" onClick={onClose}>
+            Cancel
+          </Button>
+          <Button
+            accent="green"
+            onClick={submit}
+            disabled={nameInvalid || !!datesInvalid || update.isPending}
+            data-testid="meta-edit-save"
+          >
+            {update.isPending ? 'Saving…' : 'Save'}
+          </Button>
+        </div>
+      </div>
+    </Modal>
+  );
+}
+
+// --------------------------------------------------------------------------- //
+// Add-scenarios modal                                                         //
+// --------------------------------------------------------------------------- //
+
+interface AddScenariosModalProps {
+  mission: Mission;
+  open: boolean;
+  onClose: () => void;
+}
+
+function AddScenariosModal({ mission, open, onClose }: AddScenariosModalProps) {
+  const qc = useQueryClient();
+  const [selected, setSelected] = useState<string[]>([]);
+  const catalogue = useScenarioCatalogue(open);
+
+  useEffect(() => {
+    if (open) setSelected([]);
+  }, [open]);
+
+  const add = useMutation({
+    mutationFn: (body: AddScenariosPayload) =>
+      apiPost<Mission>(`/missions/${mission.id}/scenarios`, body),
+    onSuccess: () => {
+      qc.invalidateQueries({ queryKey: missionKeys.detail(mission.id) });
+      qc.invalidateQueries({ queryKey: missionKeys.listPrefix() });
+      onClose();
+    },
+  });
+
+  const apiErr = add.error instanceof ApiError ? add.error : null;
+
+  function toggle(id: string) {
+    setSelected((prev) =>
+      prev.includes(id) ? prev.filter((x) => x !== id) : [...prev, id],
+    );
+  }
+
+  function submit() {
+    add.mutate({ scenario_template_ids: selected });
+  }
+
+  const totalTestsToAdd = useMemo(() => {
+    if (!catalogue.data) return 0;
+    const by_id = new Map<string, ScenarioTemplate>(
+      catalogue.data.items.map((sc) => [sc.id, sc] as const),
+    );
+    return selected.reduce((acc, id) => acc + (by_id.get(id)?.tests_count ?? 0), 0);
+  }, [selected, catalogue.data]);
+
+  return (
+    <Modal
+      open={open}
+      onClose={onClose}
+      title={`Add scenarios to ${mission.name}`}
+      accent="cyan"
+      size="3xl"
+      testid="mission-add-scenarios-modal"
+    >
+      <div className="flex flex-col gap-3 min-w-0">
+        {apiErr && <Alert accent="red">{apiErr.message}</Alert>}
+        {catalogue.isError && <Alert accent="red">Failed to load scenarios.</Alert>}
+        {catalogue.isLoading && (
+          <p className="font-mono text-xs text-text-dim">Loading…</p>
+        )}
+        <p className="font-mono text-2xs text-text-dim">
+          {selected.length} scenario{selected.length === 1 ? '' : 's'} ·{' '}
+          {totalTestsToAdd} test{totalTestsToAdd === 1 ? '' : 's'} will be appended
+          after the current {mission.scenarios_count}.
+        </p>
+        <ul
+          className="grid grid-cols-1 gap-2 md:grid-cols-2"
+          data-testid="add-scenarios-picker"
+        >
+          {catalogue.data?.items.map((sc) => {
+            const isSelected = selected.includes(sc.id);
+            return (
+              <li key={sc.id}>
+                <button
+                  type="button"
+                  className={`w-full rounded-md border ${
+                    isSelected ? 'border-cyan text-cyan' : 'border-border text-text'
+                  } bg-bg-card p-3 text-left font-mono text-xs hover:border-cyan`}
+                  onClick={() => toggle(sc.id)}
+                  data-testid={`add-scenario-toggle-${sc.id}`}
+                  aria-pressed={isSelected}
+                >
+                  <div className="flex items-center justify-between">
+                    <span className="text-text-bright">{sc.name}</span>
+                    <Tag accent="purple">{sc.tests_count} tests</Tag>
+                  </div>
+                  {sc.description && (
+                    <p className="mt-1 text-text-dim">{sc.description}</p>
+                  )}
+                </button>
+              </li>
+            );
+          })}
+        </ul>
+        {catalogue.data && catalogue.data.items.length === 0 && (
+          <p className="font-mono text-xs text-text-dim">
+            No scenarios in the catalogue yet.
+          </p>
+        )}
+        <div className="flex items-center justify-end gap-2 pt-2">
+          <Button accent="teal" variant="ghost" onClick={onClose}>
+            Cancel
+          </Button>
+          <Button
+            accent="green"
+            onClick={submit}
+            disabled={selected.length === 0 || add.isPending}
+            data-testid="add-scenarios-save"
+          >
+            {add.isPending ? 'Adding…' : `Add ${selected.length} scenario${selected.length === 1 ? '' : 's'}`}
+          </Button>
+        </div>
+      </div>
+    </Modal>
+  );
+}
+
+// --------------------------------------------------------------------------- //
+// Edit-members modal                                                          //
+// --------------------------------------------------------------------------- //
+
+interface EditMembersModalProps {
+  mission: Mission;
+  open: boolean;
+  onClose: () => void;
+}
+
+function EditMembersModal({ mission, open, onClose }: EditMembersModalProps) {
+  const qc = useQueryClient();
+  const roster = useRoster(open);
+  const [members, setMembers] = useState<MemberSelection[]>([]);
+
+  useEffect(() => {
+    if (!open) return;
+    setMembers(
+      mission.members.map((m) => ({
+        user_id: m.user_id,
+        role_hint: m.role_hint,
+      })),
+    );
+  }, [open, mission]);
+
+  const save = useMutation({
+    mutationFn: (body: SetMembersPayload) =>
+      apiPut<Mission>(`/missions/${mission.id}/members`, body),
+    onSuccess: () => {
+      qc.invalidateQueries({ queryKey: missionKeys.detail(mission.id) });
+      qc.invalidateQueries({ queryKey: missionKeys.listPrefix() });
+      onClose();
+    },
+  });
+
+  const apiErr = save.error instanceof ApiError ? save.error : null;
+
+  function setRole(user_id: string, role_hint: MissionRoleHint) {
+    setMembers((prev) =>
+      prev.some((m) => m.user_id === user_id)
+        ? prev.map((m) => (m.user_id === user_id ? { ...m, role_hint } : m))
+        : [...prev, { user_id, role_hint }],
+    );
+  }
+
+  function remove(user_id: string) {
+    setMembers((prev) => prev.filter((m) => m.user_id !== user_id));
+  }
+
+  function submit() {
+    const payload: SetMembersPayload = {
+      members: members.map(
+        (m): MemberPayload => ({ user_id: m.user_id, role_hint: m.role_hint }),
+      ),
+    };
+    save.mutate(payload);
+  }
+
+  return (
+    <Modal
+      open={open}
+      onClose={onClose}
+      title={`Members of ${mission.name}`}
+      accent="cyan"
+      size="3xl"
+      testid="mission-edit-members-modal"
+    >
+      <div className="flex flex-col gap-3 min-w-0">
+        {apiErr && <Alert accent="red">{apiErr.message}</Alert>}
+        {roster.isError && <Alert accent="red">Failed to load roster.</Alert>}
+        {roster.isLoading && (
+          <p className="font-mono text-xs text-text-dim">Loading users…</p>
+        )}
+        <ul className="flex flex-col gap-2" data-testid="edit-members-picker">
+          {roster.data?.items.map((u) => {
+            const selected = members.find((m) => m.user_id === u.id);
+            return (
+              <li
+                key={u.id}
+                className="flex flex-wrap items-center justify-between gap-2 rounded-md border border-border bg-bg-card p-3"
+                data-testid={`edit-member-row-${u.id}`}
+              >
+                <div>
+                  <p className="font-mono text-xs text-text-bright">
+                    {u.display_name ?? u.email}
+                  </p>
+                  {u.display_name && (
+                    <p className="font-mono text-2xs text-text-dim">{u.email}</p>
+                  )}
+                </div>
+                <div className="flex items-center gap-2">
+                  <Button
+                    accent="red"
+                    variant={selected?.role_hint === 'red' ? 'solid' : 'outline'}
+                    onClick={() => setRole(u.id, 'red')}
+                    data-testid={`edit-member-${u.id}-red`}
+                  >
+                    Red
+                  </Button>
+                  <Button
+                    accent="cyan"
+                    variant={selected?.role_hint === 'blue' ? 'solid' : 'outline'}
+                    onClick={() => setRole(u.id, 'blue')}
+                    data-testid={`edit-member-${u.id}-blue`}
+                  >
+                    Blue
+                  </Button>
+                  {selected && (
+                    <Button
+                      accent="rose"
+                      variant="ghost"
+                      onClick={() => remove(u.id)}
+                      data-testid={`edit-member-${u.id}-clear`}
+                    >
+                      ✕
+                    </Button>
+                  )}
+                </div>
+              </li>
+            );
+          })}
+        </ul>
+        <div className="flex items-center justify-end gap-2 pt-2">
+          <Button accent="teal" variant="ghost" onClick={onClose}>
+            Cancel
+          </Button>
+          <Button
+            accent="green"
+            onClick={submit}
+            disabled={save.isPending}
+            data-testid="edit-members-save"
+          >
+            {save.isPending ? 'Saving…' : 'Save members'}
+          </Button>
+        </div>
+      </div>
+    </Modal>
+  );
+}
+
+// --------------------------------------------------------------------------- //
+// Main page                                                                   //
+// --------------------------------------------------------------------------- //
+
+export function MissionDetailPage() {
+  const params = useParams();
+  const missionId = params.id ?? '';
+  const navigate = useNavigate();
+  const qc = useQueryClient();
+  const { state } = useAuth();
+
+  const canEdit =
+    state.user?.is_admin ||
+    state.user?.permissions.includes('mission.update') ||
+    false;
+
+  const [tab, setTab] = useState<Tab>('tests');
+  const [editMeta, setEditMeta] = useState(false);
+  const [addScenarios, setAddScenarios] = useState(false);
+  const [editMembers, setEditMembers] = useState(false);
+  const detail = useMission(missionId);
+
+  const transition = useMutation({
+    mutationFn: (body: TransitionPayload) =>
+      apiPost<Mission>(`/missions/${missionId}/transition`, body),
+    onSuccess: () => {
+      qc.invalidateQueries({ queryKey: missionKeys.detail(missionId) });
+      qc.invalidateQueries({ queryKey: missionKeys.listPrefix() });
+    },
+  });
+
+  const remove = useMutation({
+    mutationFn: () => apiDelete<{ ok: true }>(`/missions/${missionId}`),
+    onSuccess: () => {
+      qc.invalidateQueries({ queryKey: missionKeys.listPrefix() });
+      navigate('/missions');
+    },
+  });
+
+  const apiErr = detail.error instanceof ApiError ? detail.error : null;
+  const m = detail.data;
+
+  if (apiErr) {
+    return (
+      <section>
+        <SectionHeader prefix="Mission" highlight="Not found" accent="rose" />
+        <Alert accent="rose">{apiErr.message}</Alert>
+      </section>
+    );
+  }
+  if (!m) {
+    return <p className="font-mono text-xs text-text-dim">Loading mission…</p>;
+  }
+
+  const accent = MISSION_STATUS_ACCENT[m.status];
+  const allowedNext = ALLOWED_TRANSITIONS[m.status];
+
+  return (
+    <section data-testid={`mission-detail-${m.id}`}>
+      <div className="flex items-baseline justify-between flex-wrap gap-3">
+        <SectionHeader prefix="Mission" highlight={m.name} accent={accent} />
+        <div className="flex items-center gap-2">
+          <Tag accent={accent}>{MISSION_STATUS_LABEL[m.status]}</Tag>
+          {canEdit && (
+            <Button
+              accent="cyan"
+              variant="outline"
+              onClick={() => setEditMeta(true)}
+              data-testid="mission-edit-meta"
+            >
+              Edit
+            </Button>
+          )}
+          {allowedNext.map((target) => (
+            <Button
+              key={target}
+              accent={TRANSITION_BUTTON_ACCENT[target]}
+              onClick={() => transition.mutate({ status: target })}
+              data-testid={`mission-transition-${target}`}
+              disabled={transition.isPending}
+            >
+              → {MISSION_STATUS_LABEL[target]}
+            </Button>
+          ))}
+          <Button
+            accent="rose"
+            variant="ghost"
+            onClick={() => {
+              if (
+                window.confirm(
+                  `Soft-delete mission "${m.name}"? An admin can restore from the trash.`,
+                )
+              ) {
+                remove.mutate();
+              }
+            }}
+            data-testid="mission-delete"
+            disabled={remove.isPending}
+          >
+            Delete
+          </Button>
+        </div>
+      </div>
+
+      <Card className="mb-4">
+        <dl className="grid grid-cols-2 gap-3 md:grid-cols-4 font-mono text-2xs">
+          <div>
+            <dt className="text-text-dim uppercase tracking-wider2">Client</dt>
+            <dd className="text-text-bright">{m.client_target ?? '—'}</dd>
+          </div>
+          <div>
+            <dt className="text-text-dim uppercase tracking-wider2">Dates</dt>
+            <dd className="text-text-bright">
+              {formatDateRange(m.date_start, m.date_end)}
+            </dd>
+          </div>
+          <div>
+            <dt className="text-text-dim uppercase tracking-wider2">Scenarios</dt>
+            <dd className="text-text-bright">{m.scenarios_count}</dd>
+          </div>
+          <div>
+            <dt className="text-text-dim uppercase tracking-wider2">Tests</dt>
+            <dd className="text-text-bright">{m.tests_count}</dd>
+          </div>
+        </dl>
+        {m.description_md && (
+          <pre className="mt-3 whitespace-pre-wrap font-mono text-xs text-text">{m.description_md}</pre>
+        )}
+      </Card>
+
+      <nav className="flex gap-1 border-b border-border mb-4" aria-label="Mission tabs">
+        {TABS.map((t) => (
+          <button
+            key={t}
+            type="button"
+            onClick={() => setTab(t)}
+            data-testid={`mission-tab-${t}`}
+            className={`px-3 py-2 font-mono text-2xs uppercase tracking-wider2 ${
+              tab === t
+                ? 'text-cyan border-b-2 border-cyan -mb-px'
+                : 'text-text-dim hover:text-text-bright'
+            }`}
+          >
+            {t}
+          </button>
+        ))}
+      </nav>
+
+      {tab === 'tests' && (
+        <Card>
+          <div className="flex items-baseline justify-between flex-wrap gap-2 mb-3">
+            <p className="font-mono text-2xs text-text-dim">
+              Snapshots are frozen at append time — editing a source template
+              does not propagate.
+            </p>
+            {canEdit && (
+              <Button
+                accent="cyan"
+                onClick={() => setAddScenarios(true)}
+                data-testid="mission-add-scenarios"
+              >
+                + Add scenarios
+              </Button>
+            )}
+          </div>
+          {m.scenarios.length === 0 ? (
+            <p className="font-mono text-xs text-text-dim">
+              No scenarios snapshotted yet.
+              {canEdit && ' Click "Add scenarios" to append one.'}
+            </p>
+          ) : (
+            <div className="flex flex-col gap-4" data-testid="mission-scenarios">
+              {m.scenarios.map((sc) => (
+                <div
+                  key={sc.id}
+                  className="rounded-md border border-border bg-bg-card p-3"
+                  data-testid={`mission-scenario-${sc.id}`}
+                >
+                  <div className="flex items-center gap-2 mb-2">
+                    <Tag accent="cyan">#{sc.position + 1}</Tag>
+                    <p className="font-mono text-xs text-text-bright">
+                      {sc.snapshot_name}
+                    </p>
+                  </div>
+                  {sc.snapshot_description && (
+                    <p className="mb-2 font-mono text-2xs text-text-dim">
+                      {sc.snapshot_description}
+                    </p>
+                  )}
+                  <table className="w-full font-mono text-2xs">
+                    <thead>
+                      <tr className="text-text-dim uppercase tracking-wider2">
+                        <th className="text-left py-1">#</th>
+                        <th className="text-left py-1">Test</th>
+                        <th className="text-left py-1">MITRE</th>
+                        <th className="text-left py-1">OPSEC</th>
+                        <th className="text-left py-1">State</th>
+                      </tr>
+                    </thead>
+                    <tbody>
+                      {sc.tests.map((t) => (
+                        <tr
+                          key={t.id}
+                          className="border-t border-border/40"
+                          data-testid={`mission-test-${t.id}`}
+                        >
+                          <td className="py-1 text-text-dim">{t.position + 1}</td>
+                          <td className="py-1 text-text-bright">{t.snapshot_name}</td>
+                          <td className="py-1">
+                            <div className="flex flex-wrap gap-1">
+                              {t.mitre_tags.map((tag) => (
+                                <Tag
+                                  accent="cyan"
+                                  key={`${tag.kind}-${tag.external_id}`}
+                                >
+                                  {tag.external_id}
+                                </Tag>
+                              ))}
+                            </div>
+                          </td>
+                          <td className="py-1 text-text">
+                            {t.snapshot_opsec_level}
+                          </td>
+                          <td className="py-1">
+                            <Tag
+                              accent={
+                                t.state === 'pending'
+                                  ? 'teal'
+                                  : t.state === 'executed'
+                                    ? 'orange'
+                                    : t.state === 'reviewed_by_blue'
+                                      ? 'green'
+                                      : 'rose'
+                              }
+                            >
+                              {t.state}
+                            </Tag>
+                          </td>
+                        </tr>
+                      ))}
+                    </tbody>
+                  </table>
+                </div>
+              ))}
+            </div>
+          )}
+        </Card>
+      )}
+
+      {tab === 'members' && (
+        <Card>
+          <div className="flex items-baseline justify-between flex-wrap gap-2 mb-3">
+            <p className="font-mono text-2xs text-text-dim">
+              Members see this mission and (for reds) can author red-side fields
+              on its tests in M7+.
+            </p>
+            {canEdit && (
+              <Button
+                accent="cyan"
+                onClick={() => setEditMembers(true)}
+                data-testid="mission-edit-members"
+              >
+                Edit members
+              </Button>
+            )}
+          </div>
+          {m.members.length === 0 ? (
+            <p className="font-mono text-xs text-text-dim">
+              No members assigned.
+              {canEdit && ' Click "Edit members" to add some.'}
+            </p>
+          ) : (
+            <ul className="flex flex-col gap-2" data-testid="mission-members">
+              {m.members.map((mb) => (
+                <li
+                  key={mb.user_id}
+                  className="flex items-center justify-between rounded-md border border-border bg-bg-card p-3"
+                  data-testid={`mission-member-${mb.user_id}`}
+                >
+                  <div>
+                    <p className="font-mono text-xs text-text-bright">
+                      {mb.user_display_name ?? mb.user_email}
+                    </p>
+                    {mb.user_display_name && (
+                      <p className="font-mono text-2xs text-text-dim">
+                        {mb.user_email}
+                      </p>
+                    )}
+                  </div>
+                  <Tag accent={mb.role_hint === 'red' ? 'red' : 'cyan'}>
+                    {mb.role_hint}
+                  </Tag>
+                </li>
+              ))}
+            </ul>
+          )}
+        </Card>
+      )}
+
+      {tab === 'synthesis' && (
+        <Card>
+          <p className="font-mono text-xs text-text-dim">
+            Reveal.js slide synthesis lands in M10.
+          </p>
+        </Card>
+      )}
+
+      {tab === 'export' && (
+        <Card>
+          <p className="font-mono text-xs text-text-dim">
+            JSON / CSV exports land in M11.
+          </p>
+        </Card>
+      )}
+
+      <MetaEditModal mission={m} open={editMeta} onClose={() => setEditMeta(false)} />
+      <AddScenariosModal
+        mission={m}
+        open={addScenarios}
+        onClose={() => setAddScenarios(false)}
+      />
+      <EditMembersModal
+        mission={m}
+        open={editMembers}
+        onClose={() => setEditMembers(false)}
+      />
+    </section>
+  );
+}

frontend/src/pages/MissionsCreatePage.tsx

@@ -0,0 +1,404 @@
+import { useMutation, useQuery, useQueryClient } from '@tanstack/react-query';
+import { useMemo, useState } from 'react';
+import { useNavigate } from 'react-router-dom';
+
+import { MarkdownField } from '@/components/MarkdownField';
+import { Alert } from '@/components/ui/Alert';
+import { Button } from '@/components/ui/Button';
+import { Card } from '@/components/ui/Card';
+import { SectionHeader } from '@/components/ui/SectionHeader';
+import { Tag } from '@/components/ui/Tag';
+import { TextField } from '@/components/ui/TextField';
+import { ApiError, apiGet, apiPost } from '@/lib/api';
+import { useAuth } from '@/lib/auth';
+import {
+  missionKeys,
+  type CreateMissionPayload,
+  type Mission,
+  type MissionRoleHint,
+} from '@/lib/missions';
+import {
+  templateKeys,
+  type ScenarioTemplate,
+  type ScenarioTemplateListResponse,
+} from '@/lib/templates';
+
+interface RosterUser {
+  id: string;
+  email: string;
+  display_name: string | null;
+}
+
+interface RosterResponse {
+  items: RosterUser[];
+}
+
+interface MetaState {
+  name: string;
+  client_target: string;
+  date_start: string;
+  date_end: string;
+  description_md: string;
+}
+
+interface MemberSelection {
+  user_id: string;
+  role_hint: MissionRoleHint;
+}
+
+const STEPS: Array<{ key: 'meta' | 'scenarios' | 'members'; label: string }> = [
+  { key: 'meta', label: 'Metadata' },
+  { key: 'scenarios', label: 'Scenarios' },
+  { key: 'members', label: 'Members' },
+];
+
+function blankMeta(): MetaState {
+  return {
+    name: '',
+    client_target: '',
+    date_start: '',
+    date_end: '',
+    description_md: '',
+  };
+}
+
+function useScenarioCatalogue() {
+  return useQuery({
+    queryKey: templateKeys.scenarios(''),
+    queryFn: () =>
+      apiGet<ScenarioTemplateListResponse>('/scenario-templates?limit=500'),
+  });
+}
+
+function useRoster() {
+  return useQuery({
+    queryKey: ['users', 'roster'],
+    queryFn: () => apiGet<RosterResponse>('/users/roster'),
+  });
+}
+
+export function MissionsCreatePage() {
+  const { state } = useAuth();
+  const me = state.user;
+  const navigate = useNavigate();
+  const qc = useQueryClient();
+
+  const [stepIdx, setStepIdx] = useState(0);
+  const step = STEPS[stepIdx];
+
+  const [meta, setMeta] = useState<MetaState>(blankMeta);
+  const [scenarioIds, setScenarioIds] = useState<string[]>([]);
+  const [members, setMembers] = useState<MemberSelection[]>(() =>
+    me && !me.is_admin
+      ? [{ user_id: me.id, role_hint: 'red' }]
+      : [],
+  );
+
+  const scenarios = useScenarioCatalogue();
+  const roster = useRoster();
+
+  const createMutation = useMutation({
+    mutationFn: (body: CreateMissionPayload) => apiPost<Mission>('/missions', body),
+    onSuccess: (created) => {
+      qc.invalidateQueries({ queryKey: missionKeys.listPrefix() });
+      navigate(`/missions/${created.id}`);
+    },
+  });
+
+  const apiErr =
+    createMutation.error instanceof ApiError ? createMutation.error : null;
+
+  const metaInvalid = meta.name.trim().length === 0;
+  const datesInvalid =
+    meta.date_start &&
+    meta.date_end &&
+    meta.date_end < meta.date_start;
+
+  const scenarioById = useMemo(() => {
+    const m = new Map<string, ScenarioTemplate>();
+    for (const sc of scenarios.data?.items ?? []) m.set(sc.id, sc);
+    return m;
+  }, [scenarios.data]);
+
+  const next = () => setStepIdx((i) => Math.min(i + 1, STEPS.length - 1));
+  const prev = () => setStepIdx((i) => Math.max(i - 1, 0));
+
+  function toggleScenario(id: string) {
+    setScenarioIds((prev) =>
+      prev.includes(id) ? prev.filter((x) => x !== id) : [...prev, id],
+    );
+  }
+
+  function setMemberRole(user_id: string, role_hint: MissionRoleHint) {
+    setMembers((prev) =>
+      prev.some((m) => m.user_id === user_id)
+        ? prev.map((m) => (m.user_id === user_id ? { ...m, role_hint } : m))
+        : [...prev, { user_id, role_hint }],
+    );
+  }
+
+  function removeMember(user_id: string) {
+    setMembers((prev) => prev.filter((m) => m.user_id !== user_id));
+  }
+
+  function submit() {
+    const payload: CreateMissionPayload = {
+      name: meta.name.trim(),
+      client_target: meta.client_target.trim() || null,
+      date_start: meta.date_start || null,
+      date_end: meta.date_end || null,
+      description_md: meta.description_md.trim() || null,
+      scenario_template_ids: scenarioIds,
+      members,
+    };
+    createMutation.mutate(payload);
+  }
+
+  const totalSelectedTests = useMemo(
+    () =>
+      scenarioIds.reduce(
+        (acc, id) => acc + (scenarioById.get(id)?.tests_count ?? 0),
+        0,
+      ),
+    [scenarioIds, scenarioById],
+  );
+
+  return (
+    <section data-testid="missions-create">
+      <SectionHeader prefix="New" highlight="Mission" accent="cyan" />
+
+      <Card className="mb-6">
+        <ol className="flex items-center gap-2" data-testid="missions-create-steps">
+          {STEPS.map((s, i) => {
+            const active = i === stepIdx;
+            const done = i < stepIdx;
+            const accent: 'cyan' | 'green' | 'teal' = active
+              ? 'cyan'
+              : done
+                ? 'green'
+                : 'teal';
+            return (
+              <li key={s.key} className="flex items-center gap-2">
+                <Tag accent={accent}>{i + 1}. {s.label}</Tag>
+                {i < STEPS.length - 1 && (
+                  <span className="text-text-dim font-mono">→</span>
+                )}
+              </li>
+            );
+          })}
+        </ol>
+      </Card>
+
+      {apiErr && (
+        <div data-testid="missions-create-error" className="mb-4">
+          <Alert accent="red">{apiErr.message}</Alert>
+        </div>
+      )}
+
+      {step.key === 'meta' && (
+        <Card title="Metadata" sub="Identification and scope">
+          <div className="grid grid-cols-1 gap-3 md:grid-cols-2">
+            <TextField
+              label="Name"
+              required
+              value={meta.name}
+              onChange={(e) => setMeta((p) => ({ ...p, name: e.target.value }))}
+              data-testid="meta-name"
+              placeholder="purple-q2-2026"
+            />
+            <TextField
+              label="Client / target"
+              value={meta.client_target}
+              onChange={(e) =>
+                setMeta((p) => ({ ...p, client_target: e.target.value }))
+              }
+              data-testid="meta-client"
+              placeholder="Acme Corp"
+            />
+            <TextField
+              label="Start date"
+              type="date"
+              value={meta.date_start}
+              onChange={(e) =>
+                setMeta((p) => ({ ...p, date_start: e.target.value }))
+              }
+              data-testid="meta-date-start"
+            />
+            <TextField
+              label="End date"
+              type="date"
+              value={meta.date_end}
+              onChange={(e) =>
+                setMeta((p) => ({ ...p, date_end: e.target.value }))
+              }
+              data-testid="meta-date-end"
+            />
+          </div>
+          <div className="mt-4">
+            <MarkdownField
+              label="ROE / Description"
+              value={meta.description_md}
+              onChange={(v) =>
+                setMeta((p) => ({ ...p, description_md: v }))
+              }
+              data-testid="meta-description"
+            />
+          </div>
+          {datesInvalid && (
+            <p className="mt-3 font-mono text-2xs text-red" data-testid="meta-date-error">
+              End date must be on or after start date.
+            </p>
+          )}
+        </Card>
+      )}
+
+      {step.key === 'scenarios' && (
+        <Card
+          title="Scenarios"
+          sub={`Select reusable scenarios — ${totalSelectedTests} tests will be snapshotted`}
+        >
+          {scenarios.isError && (
+            <Alert accent="red">Failed to load scenarios.</Alert>
+          )}
+          {scenarios.isLoading && (
+            <p className="font-mono text-xs text-text-dim">Loading…</p>
+          )}
+          <ul
+            className="grid grid-cols-1 gap-2 md:grid-cols-2"
+            data-testid="scenarios-picker"
+          >
+            {scenarios.data?.items.map((sc) => {
+              const selected = scenarioIds.includes(sc.id);
+              return (
+                <li key={sc.id}>
+                  <button
+                    type="button"
+                    className={`w-full rounded-md border ${
+                      selected ? 'border-cyan text-cyan' : 'border-border text-text'
+                    } bg-bg-card p-3 text-left font-mono text-xs hover:border-cyan`}
+                    onClick={() => toggleScenario(sc.id)}
+                    data-testid={`scenario-toggle-${sc.id}`}
+                    aria-pressed={selected}
+                  >
+                    <div className="flex items-center justify-between">
+                      <span className="text-text-bright">{sc.name}</span>
+                      <Tag accent="purple">{sc.tests_count} tests</Tag>
+                    </div>
+                    {sc.description && (
+                      <p className="mt-1 text-text-dim">{sc.description}</p>
+                    )}
+                  </button>
+                </li>
+              );
+            })}
+          </ul>
+          {scenarios.data && scenarios.data.items.length === 0 && (
+            <p className="font-mono text-xs text-text-dim">
+              No scenarios in the catalogue yet — create one in
+              {' '}<a href="/admin/scenarios" className="text-cyan underline">Admin → Scenarios</a>{' '}
+              first.
+            </p>
+          )}
+        </Card>
+      )}
+
+      {step.key === 'members' && (
+        <Card title="Members" sub="Who works on this mission and on which side">
+          {roster.isError && (
+            <Alert accent="red">Failed to load roster.</Alert>
+          )}
+          {roster.isLoading && (
+            <p className="font-mono text-xs text-text-dim">Loading users…</p>
+          )}
+          <ul
+            className="flex flex-col gap-2"
+            data-testid="members-picker"
+          >
+            {roster.data?.items.map((u) => {
+              const selected = members.find((m) => m.user_id === u.id);
+              return (
+                <li
+                  key={u.id}
+                  className="flex flex-wrap items-center justify-between gap-2 rounded-md border border-border bg-bg-card p-3"
+                  data-testid={`member-row-${u.id}`}
+                >
+                  <div>
+                    <p className="font-mono text-xs text-text-bright">
+                      {u.display_name ?? u.email}
+                    </p>
+                    {u.display_name && (
+                      <p className="font-mono text-2xs text-text-dim">{u.email}</p>
+                    )}
+                  </div>
+                  <div className="flex items-center gap-2">
+                    <Button
+                      accent="red"
+                      variant={selected?.role_hint === 'red' ? 'solid' : 'outline'}
+                      onClick={() => setMemberRole(u.id, 'red')}
+                      data-testid={`member-${u.id}-red`}
+                    >
+                      Red
+                    </Button>
+                    <Button
+                      accent="cyan"
+                      variant={selected?.role_hint === 'blue' ? 'solid' : 'outline'}
+                      onClick={() => setMemberRole(u.id, 'blue')}
+                      data-testid={`member-${u.id}-blue`}
+                    >
+                      Blue
+                    </Button>
+                    {selected && (
+                      <Button
+                        accent="rose"
+                        variant="ghost"
+                        onClick={() => removeMember(u.id)}
+                        data-testid={`member-${u.id}-clear`}
+                      >
+                        ✕
+                      </Button>
+                    )}
+                  </div>
+                </li>
+              );
+            })}
+          </ul>
+        </Card>
+      )}
+
+      <div className="mt-6 flex items-center justify-between">
+        <Button
+          accent="teal"
+          variant="ghost"
+          onClick={prev}
+          disabled={stepIdx === 0}
+          data-testid="missions-create-prev"
+        >
+          ← Back
+        </Button>
+        {stepIdx < STEPS.length - 1 ? (
+          <Button
+            accent="cyan"
+            onClick={next}
+            disabled={step.key === 'meta' && (metaInvalid || !!datesInvalid)}
+            data-testid="missions-create-next"
+          >
+            Next →
+          </Button>
+        ) : (
+          <Button
+            accent="green"
+            onClick={submit}
+            disabled={
+              createMutation.isPending ||
+              metaInvalid ||
+              !!datesInvalid
+            }
+            data-testid="missions-create-submit"
+          >
+            {createMutation.isPending ? 'Creating…' : 'Create mission'}
+          </Button>
+        )}
+      </div>
+    </section>
+  );
+}

frontend/src/pages/MissionsListPage.tsx

@@ -0,0 +1,167 @@
+import { useQuery } from '@tanstack/react-query';
+import { useMemo, useState } from 'react';
+import { Link } from 'react-router-dom';
+
+import { Alert } from '@/components/ui/Alert';
+import { Button } from '@/components/ui/Button';
+import { Card } from '@/components/ui/Card';
+import { SectionHeader } from '@/components/ui/SectionHeader';
+import { Tag } from '@/components/ui/Tag';
+import { TextField } from '@/components/ui/TextField';
+import { ApiError, apiGet } from '@/lib/api';
+import { useAuth } from '@/lib/auth';
+import {
+  MISSION_STATUS_ACCENT,
+  MISSION_STATUS_LABEL,
+  buildMissionQueryString,
+  missionKeys,
+  type MissionFilters,
+  type MissionListResponse,
+  type MissionStatus,
+} from '@/lib/missions';
+
+const STATUS_OPTIONS: Array<{ value: '' | MissionStatus; label: string }> = [
+  { value: '', label: 'All statuses' },
+  { value: 'draft', label: MISSION_STATUS_LABEL.draft },
+  { value: 'in_progress', label: MISSION_STATUS_LABEL.in_progress },
+  { value: 'completed', label: MISSION_STATUS_LABEL.completed },
+  { value: 'archived', label: MISSION_STATUS_LABEL.archived },
+];
+
+function useMissions(filters: MissionFilters) {
+  return useQuery({
+    queryKey: missionKeys.list(filters),
+    queryFn: () =>
+      apiGet<MissionListResponse>(`/missions${buildMissionQueryString(filters)}`),
+  });
+}
+
+function formatDateRange(start: string | null, end: string | null): string {
+  if (!start && !end) return '—';
+  if (start && end) return `${start} → ${end}`;
+  return start ?? end ?? '—';
+}
+
+export function MissionsListPage() {
+  const { state } = useAuth();
+  const canCreate =
+    state.user?.is_admin || state.user?.permissions.includes('mission.create');
+
+  const [q, setQ] = useState('');
+  const [status, setStatus] = useState<'' | MissionStatus>('');
+  const [client, setClient] = useState('');
+
+  const filters = useMemo<MissionFilters>(
+    () => ({
+      q: q.trim() || undefined,
+      status: status || undefined,
+      client: client.trim() || undefined,
+    }),
+    [q, status, client],
+  );
+
+  const { data, error, isLoading } = useMissions(filters);
+  const apiErr = error instanceof ApiError ? error : null;
+
+  return (
+    <section data-testid="missions-list">
+      <div className="flex items-baseline justify-between">
+        <SectionHeader prefix="Plan" highlight="Missions" accent="cyan" />
+        {canCreate && (
+          <Link to="/missions/new" data-testid="missions-new-link">
+            <Button accent="cyan">+ New mission</Button>
+          </Link>
+        )}
+      </div>
+
+      <Card className="mb-6">
+        <div className="grid grid-cols-1 gap-3 md:grid-cols-3">
+          <TextField
+            label="Search"
+            placeholder="name or description"
+            value={q}
+            onChange={(e) => setQ(e.target.value)}
+            data-testid="missions-filter-q"
+          />
+          <TextField
+            label="Client"
+            placeholder="acme corp"
+            value={client}
+            onChange={(e) => setClient(e.target.value)}
+            data-testid="missions-filter-client"
+          />
+          <div className="flex flex-col gap-1">
+            <label className="font-mono text-2xs uppercase tracking-wider2 text-text-dim">
+              Status
+            </label>
+            <select
+              value={status}
+              onChange={(e) => setStatus(e.target.value as '' | MissionStatus)}
+              data-testid="missions-filter-status"
+              className="bg-bg-card border border-border rounded px-3 py-2 font-mono text-xs text-text-bright"
+            >
+              {STATUS_OPTIONS.map((opt) => (
+                <option key={opt.value} value={opt.value}>
+                  {opt.label}
+                </option>
+              ))}
+            </select>
+          </div>
+        </div>
+      </Card>
+
+      {apiErr && (
+        <div data-testid="missions-error">
+          <Alert accent="red">{apiErr.message}</Alert>
+        </div>
+      )}
+
+      {isLoading && (
+        <p className="font-mono text-xs text-text-dim">Loading missions…</p>
+      )}
+
+      {data && data.items.length === 0 && !isLoading && (
+        <Card>
+          <p className="font-mono text-xs text-text-dim" data-testid="missions-empty">
+            No missions match the filters. {canCreate ? 'Create one to get started.' : ''}
+          </p>
+        </Card>
+      )}
+
+      <div className="grid grid-cols-1 gap-3 lg:grid-cols-2" data-testid="missions-grid">
+        {data?.items.map((m) => {
+          const accent = MISSION_STATUS_ACCENT[m.status];
+          return (
+            <Link key={m.id} to={`/missions/${m.id}`} data-testid={`mission-card-${m.id}`}>
+              <Card
+                accent={accent}
+                title={m.name}
+                sub={m.client_target ?? 'No client'}
+                className="h-full"
+              >
+                <div className="flex flex-wrap items-center gap-2">
+                  <Tag accent={accent}>{MISSION_STATUS_LABEL[m.status]}</Tag>
+                  <Tag accent="cyan">{m.scenarios_count} scenarios</Tag>
+                  <Tag accent="purple">{m.tests_count} tests</Tag>
+                  <Tag accent="teal">{m.members_count} members</Tag>
+                </div>
+                <p className="mt-3 font-mono text-2xs text-text-dim">
+                  {formatDateRange(m.date_start, m.date_end)}
+                </p>
+              </Card>
+            </Link>
+          );
+        })}
+      </div>
+
+      {data && (
+        <p
+          className="mt-4 font-mono text-2xs text-text-dim"
+          data-testid="missions-total"
+        >
+          {data.total} mission{data.total === 1 ? '' : 's'} total
+        </p>
+      )}
+    </section>
+  );
+}

tasks/lessons.md

@@ -78,6 +78,17 @@ project: Metamorph
 - **`podman compose stop api` puis `up -d api` casse les dépendances** entre containers (`db` healthy → `api` depends on it) : podman-compose ne résout pas la chaîne de deps quand on cible un seul service. Pour un override d'env, mieux vaut `make down && APP_ENV=test make up`.
 - **`/diag/reset` test-only** : exposer un endpoint qui truncate la DB est tentant pour les e2e mais ouvre une grosse surface en cas de fuite. Compromise actuel : autorisé en `dev` ET `test` (pas en prod), avec un log `WARNING` à chaque appel. Si jamais on déploie une stack dev publique, **désactiver** l'endpoint via env var.
 
+## 2026-05-13 — M6 missions + snapshot
+
+- **Snapshot independence requires more than column copies — denormalise the join tables too.** `mission_tests` copies every scalar template field, but if `mission_test_mitre_tags` kept FKs to `mitre_*` rows, a future re-sync that drops a technique would cascade through `ON DELETE CASCADE` and silently mutate frozen missions. The M1 schema already split `mission_test_mitre_tags` with frozen `(mitre_external_id, mitre_name, mitre_url)` columns and no FK — at snapshot time we denormalise via a 3-query batch lookup (`_resolve_mitre_lookup`) and build the rows in-memory. Pattern to reuse for any "frozen reference" relationship in the future.
+- **`/diag/reset` truncate order is FK-aware**: `mission_scenarios.source_scenario_template_id` and `mission_tests.source_test_template_id` are `ON DELETE SET NULL`. Truncating template tables first would force PG to NULL those columns one by one. Reverse the order — wipe mission tables (which cascade to members/scenarios/tests/tags/categories from `missions`) BEFORE the templates. Saves a round-trip + keeps the truncate logically aligned with the dependency graph.
+- **Membership visibility = 404, not 403.** Returning 403 for "mission exists but you're not a member" leaks the existence of the mission. The service returns 404 in both "doesn't exist" and "not visible to you" cases via the same `MissionNotFound` exception. The decorator stack handles perm-level 403 (you can't even GET /missions); the service handles row-level 404. Pattern: gate "type of action" via decorator perms, gate "which rows" via service-level membership filters that collapse to 404.
+- **Auto-add the non-admin creator as a member.** Without this, a redteamer who creates a mission and forgets to add themselves to `members[]` immediately loses visibility (403 on subsequent GETs because they're not a member). Solved at the service layer: `if not creator_is_admin and creator_id not in members: prepend (creator_id, 'red')`. Admin creators don't auto-add because they bypass membership anyway. Documented in the docstring + tested explicitly (`test_non_admin_creator_auto_added`).
+- **Minimum-surface roster endpoint pattern**: `/users` returns admin metadata (is_admin via groups, is_active, group memberships). The mission wizard needs a list of assignable users from a non-admin redteamer's perspective — exposing /users to them would leak admin metadata. Added a dedicated `GET /users/roster` returning only `(id, email, display_name)` and gated by **any of** `user.read`, `mission.create`, `mission.update`. Pattern: when a cross-feature needs a smaller slice of an admin endpoint, create a dedicated lightweight endpoint rather than relaxing the admin one.
+- **Pyright is not always wrong about "unused" parameters** — the original `_to_list_item(s: Session, m: Mission)` took `s` but never accessed it (the function uses already-`selectinload`ed relationships). Removed the param. Lesson: when adding a `Session` parameter to a view-assembly helper, audit whether the body actually issues queries through it.
+- **`flask.abort()` is not typed `NoReturn` in this project's Pyright config** so `def f() -> X: if x is None: abort(...); return x` raises a return-type error. Workaround: add `assert user is not None` after the abort to narrow the type. Cleaner than `cast(...)`. Pattern to reuse anywhere we abort-and-return.
+- **Snapshot of multiple scenarios is a 4-query write** regardless of test count: (1) load N scenario_templates with their join rows, (2) load M test_templates by id with mitre_tags, (3) batch-resolve MITRE rows (3 queries for tactic/technique/sub), (4) insert mission_scenarios + mission_tests + mission_test_mitre_tags via the SQLAlchemy unit of work. Avoid the temptation to query inside per-test loops — it explodes to O(scenarios × tests × tag_kinds) easily.
+
 ## 2026-05-12 — M5 templates + scenarios
 
 - **`extra={"name": ...}` dans `log.info()` crash silencieusement** — Python's `logging.LogRecord` réserve `name` (le logger name). Coût : 500 sur le POST, message peu parlant (`KeyError: "Attempt to overwrite 'name' in LogRecord"`). Fix : renommer la clé (`template_name`). Liste réservée à éviter : `name`, `msg`, `args`, `levelname`, `levelno`, `pathname`, `filename`, `module`, `funcName`, `created`, `msecs`, `lineno`, `thread`, `threadName`, `process`. Pattern : préfixer les clés extra par l'entité (`template_name`, `group_id`, `user_id` est OK mais `id` aussi est piégeux dans certains setups).

tasks/testing-m6.md

@@ -0,0 +1,124 @@
+---
+type: testing
+milestone: M6
+date: "2026-05-13"
+project: Metamorph
+---
+
+# Testing M6 — Missions & snapshot
+
+## 1. Lancement de la stack
+
+```bash
+make clean
+make up
+make migrate
+make seed-mitre  # MITRE tags are snapshotted onto mission_tests; without them
+                 # the snapshot will simply have an empty mitre_tags array
+```
+
+> L'admin stable `admin@metamorph.local / AdminPass1234!` est restauré
+> automatiquement par le hook `afterAll` du spec e2e M6, mais la 1ʳᵉ fois,
+> bootstrappe-le via `/setup` (ou laisse les tests faire le travail).
+
+## 2. Tests automatisés
+
+```bash
+make test-api    # 103 tests pytest dont 22 M6 (snapshot, membership, transitions, members CRUD, perm gating)
+make e2e         # 43 tests Playwright dont 5 M6 (snapshot freezing, non-admin visibility, transitions, wizard, list filter)
+```
+
+Rapport HTML : `e2e/playwright-report/`.
+
+## 3. Smoke navigateur
+
+### Pré-requis
+- Stack `make up` + admin loggé.
+- MITRE seedé (`/mitre` montre 15 tactics).
+- Au moins **1 test_template** et **1 scenario_template** dans le catalogue M5
+  (pour avoir quelque chose à snapshotter).
+
+### 3.1 Liste & création (`/missions`)
+1. Cliquer **Missions** dans la nav (visible si tu as la perm `mission.read` ou tu es admin) → la liste s'affiche avec un message vide la 1ʳᵉ fois.
+2. Cliquer **+ New mission** → page wizard `/missions/new`.
+3. **Étape 1 — Metadata** :
+   - `Name` (requis) → `purple-2026-Q2`
+   - `Client / target` → `Acme Corp`
+   - `Start date` / `End date` → si tu inverses, un message en rouge apparaît et **Next** est désactivé.
+   - `ROE / Description` (markdown) → optionnel.
+4. **Next** → **Étape 2 — Scenarios** :
+   - Le catalogue M5 s'affiche en grille de boutons. Cliquer un scénario le sélectionne (bordure cyan).
+   - Le sous-titre du Card affiche le total de tests qui seront snapshotés.
+5. **Next** → **Étape 3 — Members** :
+   - Le roster (issu de `/users/roster`) liste les utilisateurs actifs.
+   - Pour chaque user, deux boutons **Red** / **Blue** togglent l'inclusion + le rôle. ✕ retire.
+   - Si tu es un redteamer non-admin, tu es pré-sélectionné en `red` (auto-add côté backend si tu oublies).
+6. **Create mission** → redirection vers `/missions/<id>`. La nouvelle mission apparaît en haut de la liste après retour.
+
+### 3.2 Filtres (`/missions`)
+- **Search** : full-text sur `name` / `description_md`.
+- **Client** : LIKE sur `client_target`.
+- **Status** : select draft / in_progress / completed / archived.
+- Les filtres sont combinés en AND (ex : `status=in_progress & client=acme`).
+
+### 3.3 Page détail (`/missions/<id>`)
+1. En-tête : nom + status pill + boutons de transition.
+   - **draft** → boutons `→ In Progress` et `→ Archived`.
+   - **in_progress** → `→ Completed` et `→ Archived`.
+   - **completed** → `→ Archived` uniquement.
+   - **archived** → aucun bouton.
+2. Cliquer un bouton → status update immédiat (cache invalidé, badge re-rendu).
+3. **Delete** (en rose) → confirm prompt → soft-delete → redirige vers `/missions`. Réapparait via `?include_deleted=true` (admin only).
+4. **Tabs** :
+   - **tests** : tableau par scénario avec `# | Test | MITRE | OPSEC | State`. Les MITRE chips affichent l'external_id frozen.
+   - **members** : pills Red/Blue avec email + display_name.
+   - **synthesis** : placeholder « lands in M10 ».
+   - **export** : placeholder « lands in M11 ».
+
+## 4. Vérification du snapshot (DoD)
+
+1. Crée une mission qui référence un scenario_template `sc1` contenant `test_template_t1`.
+2. Aller dans `/admin/tests`, éditer `test_template_t1` : changer le nom et les tags MITRE.
+3. Retour sur `/missions/<id>` (rafraîchir si la cache TanStack tient encore) → la table montre **toujours** l'ancien nom et l'ancien tag MITRE. Le snapshot est gelé. ✅
+
+## 5. Vérification visibilité par membership
+
+1. Login en admin, créer 2 missions :
+   - `m-only-admin` sans aucun membre.
+   - `m-shared` avec Alice (red) en membre.
+2. Login en Alice.
+3. `/missions` → seule `m-shared` apparaît dans la liste. `GET /api/v1/missions/<m-only-admin>` retourne **404** (pas 403 — pas de fuite d'existence).
+4. Alice tente de PUT/transition/delete sur `m-only-admin` → 404 idem.
+
+## 6. Vérification transitions
+
+| from        | to            | result |
+|-------------|---------------|--------|
+| draft       | in_progress   | 200    |
+| draft       | archived      | 200    |
+| draft       | completed     | **409 invalid_transition** |
+| in_progress | completed     | 200    |
+| in_progress | archived      | 200    |
+| completed   | archived      | 200    |
+| completed   | in_progress   | **409** |
+| archived    | (anything)    | **409** |
+| any         | (same status) | 200 (no-op)  |
+
+```bash
+curl -X POST -H "Authorization: Bearer $T" -H 'Content-Type: application/json' \
+     -d '{"status":"completed"}' \
+     http://localhost:8080/api/v1/missions/<id>/transition
+```
+
+## 7. Quick teardown
+
+```bash
+make down
+# ou pour un reset complet :
+curl -X POST http://localhost:8080/api/v1/diag/reset  # test-only, wipes everything
+```
+
+> Reminder: `make test-api` and `make e2e` **share the dev DB container** —
+> running them mid-session WILL wipe user data. The M6 spec's `afterAll`
+> restores the stable admin and re-seeds MITRE, but custom templates / missions
+> you've created by hand are lost. Cf. `tasks/lessons.md` (M5 lessons section).

tasks/todo.md

@@ -133,7 +133,7 @@ spec: tasks/spec.md
 
 ---
 
-## M6 — Missions & snapshot ☐
+## M6 — Missions & snapshot ☑
 
 **But** : transformer les templates en missions vivantes.