docs(backend): track sprint-0 follow-ups + flag integration migration gap

- `tasks/todo.md`: B0.5 description updated (re2 hard dep, no fallback);
  add a "Backend follow-ups (sprint 1+)" section with M1-M7 + N1-N6 from
  the code-review verdict.
- `CHANGELOG.md`: backend skeleton bullets refreshed (no re fallback,
  streaming blob store, audit + scope on CRUD, 56 unit tests); new
  "Code-review remediation" subsection lists B1 / MA1-MA6 / N4 / N6 / M8
  with one-line rationale each.
- `tests/integration/conftest.py`: leave `db.create_all()` in place but
  add an inline TODO (N6) pointing at the Alembic switchover that will
  exercise the F11 seed + audit-log role grants in CI.

CHANGELOG.md

@@ -41,8 +41,10 @@ UX wireframes (mock data). No real connector, no reporting until PR1/PR2/PR3 lan
 - `C2Connector` ABC + `Payload` / `TaskHandle` / `TaskResult` / `TaskStatus` dataclasses +
   `PayloadType` enum + `ConnectorFactory` keyed on `c2_type`. Mythic payload map populated;
   Home stays empty until PR2.
-- Jinja2 `SandboxedEnvironment` + `regex_extract` filter (google-re2 with `re` fallback) +
-  `{{ outputs.text }}` / `{{ outputs.blob() }}` accessors (10 MB cap, UTF-8 → latin-1).
+- Jinja2 `SandboxedEnvironment` + `regex_extract` filter (`google-re2` hard dependency per
+  D-011 / B1 — `RuntimeError` at boot if absent, no `re` fallback) + `{{ outputs.text }}` /
+  `{{ outputs.blob() }}` accessors reading gzip-compressed blobs (10 MB cap after
+  decompression, UTF-8 → latin-1).
 - Group-based RBAC: `Permission` + `GroupName` + `GROUP_PERMISSIONS` mirror the F11 matrix;
   `@require_perm` decorator + `AuthUser` Flask-Login wrapper that resolves the permission set
   from the user's groups.
@@ -51,10 +53,15 @@ UX wireframes (mock data). No real connector, no reporting until PR1/PR2/PR3 lan
 - Hash-chained append-only audit writer (sprint 0 fills `prev_hash` / `row_hash` at insert;
   verifier shipped in v2).
 - Flat CRUD blueprints: engagements / hosts / TTPs / scenarios + scenario steps. F3 invariant
-  enforced (host.c2_type must match scenario.c2_type at compose time).
+  enforced (host.c2_type must match scenario.c2_type at compose time). Every mutation calls
+  the hash-chained audit writer (MA5); created rows carry `created_by_id` (MA4); listings and
+  per-engagement routes scope to `engagement_member` for RT operators (MA6 / F11).
+- Content-addressed gzip blob store (`mimic.storage.blob`): streaming write with a `max_bytes`
+  cap (raises `BlobTooLarge` mid-stream — MA2), atomic rename, `0o750` directory mode.
 - `mimic-cli` (click): `user create`, `db dump`, `db restore`.
-- pytest baseline: **38 unit tests passing**, integration scaffold ready for testcontainers
-  Postgres (`/healthz` smoke included).
+- pytest baseline: **56 unit tests passing** (templating, regex_extract, password, soc_token,
+  RBAC matrix, connector factory, audit hash, blob CAS, migration seed parity). Integration
+  scaffold ready for testcontainers Postgres (`/healthz` smoke included).
 
 #### Spec deltas applied in this sprint
 
@@ -69,3 +76,31 @@ Implementation arbitrations logged in this sprint:
 - **D-013** — `audit_log` hash chain (`prev_hash` / `row_hash`) shipped v1.
 - **D-014** — UUID columns use SQLAlchemy 2 native `Uuid` mapping; no `type_annotation_map`
   on the declarative base (Flask-SQLAlchemy incompatibility).
+
+#### Code-review remediation (`12d131c` → `feature/backend-skeleton`)
+
+- **B1** — Dropped the `re` stdlib fallback in `regex_extract`. `google-re2` is now a hard
+  dependency (B1 / D-011); the module raises `RuntimeError` at import if absent.
+- **MA1** — Removed `scripts/postgres-init/00-roles.sql` (no more hardcoded `CHANGE_ME`
+  password). Audit-writer role provisioning is the playbook's responsibility (D-010);
+  `backend/README.md` documents the manual dev-only `CREATE ROLE` command.
+- **MA2** — `store_blob` now accepts a binary stream + `max_bytes`, streams sha256+gzip in
+  64 KB chunks, and raises `BlobTooLarge` mid-stream (cleans up the temp file). No more
+  whole-buffer RAM load.
+- **MA3** — Inlined the F11 permission matrix in the initial Alembic migration; the runtime
+  matrix is no longer imported there. A new unit test
+  (`test_migration_seed_matches_current_matrix`) fails if the two drift apart.
+- **MA4** — `created_by_id = current_user.id` set in `engagement`, `ttp`, and `scenario`
+  create endpoints.
+- **MA5** — Every mutation endpoint now writes an audit row through the hash-chained
+  `AuditWriter` (F13).
+- **MA6** — RT operators only see engagements they are members of (`engagement_member` join
+  on list, membership probe on `get`/`put`/`delete`/`host`/`scenario`/...). RT leads bypass.
+- **N4** — `gunicorn` declared in `pyproject.toml` dependencies (the Dockerfile `CMD` now
+  resolves correctly).
+- **N6** — `tests/integration/conftest.py` keeps `db.create_all()` for now; commented TODO to
+  switch over to Alembic once the playbook owns the audit role.
+- **M8** — Initial migration docstring no longer mentions `ttp_version`.
+
+Verification on the latest commit: `ruff check`, `ruff format --check`, `mypy --strict`, and
+`pytest tests/unit` all pass; 56 unit tests green.

backend/tests/integration/conftest.py

@@ -37,6 +37,9 @@ def app(postgres_dsn: str, monkeypatch: pytest.MonkeyPatch):
 
     application = create_app()
     with application.app_context():
+        # TODO (N6 follow-up, sprint 1): run Alembic migrations instead of
+        # db.create_all() so the integration tests exercise the real schema
+        # including the audit_log role grants and the F11 seed.
         db.create_all()
         yield application
         db.session.remove()

tasks/todo.md

@@ -16,9 +16,10 @@ Repo skeleton + foundational modules. Nothing that depends on PR1/PR2/PR3.
       evidence, report, soc_session, c2_credential, audit_log).
 - [x] B0.4 — `C2Connector` ABC + dataclasses + `payload_type` enum + factory keyed on
       `c2_type`. Mythic payload map populated; Home stays empty until PR2.
-- [x] B0.5 — Jinja2 SandboxedEnvironment, `regex_extract` filter (google-re2 with `re`
-      fallback) per D-011 semantics (fail-loud no-match), `{{ outputs.text }}` /
-      `{{ outputs.blob() }}` accessors with 10 MB cap.
+- [x] B0.5 — Jinja2 SandboxedEnvironment, `regex_extract` filter (`google-re2` hard
+      dependency per D-011, raises `RuntimeError` at boot if absent — no `re` fallback),
+      fail-loud no-match, `{{ outputs.text }}` / `{{ outputs.blob() }}` accessors
+      reading gzip-compressed blobs with 10 MB cap.
 - [x] B0.6 — bcrypt password helpers + SOC opaque token (256-bit url-safe, bcrypt-hashed) +
       group-based RBAC matrix matching F11 + `@require_perm` decorator.
 - [x] B0.7 — Flat CRUD blueprints for engagements / hosts / TTPs / scenarios (incl. step
@@ -26,6 +27,43 @@ Repo skeleton + foundational modules. Nothing that depends on PR1/PR2/PR3.
 - [x] B0.8 — pytest baseline: unit tests passing, integration scaffold ready
       (testcontainers Postgres + `/healthz` smoke).
 
+## Backend follow-ups (sprint 1+)
+
+Tracked from code-review verdict on `feature/backend-skeleton` @ 12d131c:
+
+### MINOR (8) — to schedule
+
+- **M1** — Replace `parse_uuid` integer-ish lookup with `werkzeug` UUID converter on
+  the routes (`<uuid:eid>`) to avoid the 404 on malformed strings being hidden by
+  the 400 path.
+- **M2** — Add OpenAPI generation (Pydantic 2 + `flask-pydantic-openapi` or hand-rolled).
+- **M3** — Wire `flask-limiter` for `/auth/local/login` (NF-network).
+- **M4** — Replace string-based `Engagement.status` setter with a typed transition method.
+- **M5** — Introduce per-engagement read view that pre-joins `engagement_member` for
+  RT operator dashboards (current per-request join is fine for v1 traffic, but
+  re-evaluate at scale).
+- **M6** — `mimic-cli user create` does not handle the SOC user-type (intended, but
+  document and gate explicitly with a clean error message).
+- **M7** — Add a `mimic-cli` `engagement add-member <uid> --role rt_operator` shortcut so
+  the F11 scoping in MA6 is reachable from the CLI without manual SQL.
+- **M8** — _(fixed in MA1 follow-up commit)_ Initial migration docstring no longer
+  references `ttp_version`.
+
+### NIT (6) — opportunistic
+
+- **N1** — Sort imports inside `mimic.db.models.__init__` alphabetically for diff
+  stability.
+- **N2** — Extract the `_engagement_or_404` duplicated body into a shared helper.
+- **N3** — Replace the inline `Permission.TTP_PROMOTE not in perms` check in `ttps.py`
+  with a second `@require_perm`-style decorator.
+- **N4** — _(fixed)_ `gunicorn` added to `pyproject.toml` dependencies.
+- **N5** — Replace bare `getattr(current_user, "groups", frozenset())` accesses by a
+  thin `current_groups()` helper.
+- **N6** — `tests/integration/conftest.py` uses `db.create_all()` instead of running
+  Alembic. Marked with a TODO; switch over once the F11 seed must be exercised in
+  integration. Plan: convert to `alembic upgrade head` once the audit role
+  bootstrap lives in the playbook (D-010).
+
 ## Frontend (`ux-frontend`)
 
 - [ ] F0.1 — `frontend/` Vite + React + TypeScript strict + Tailwind 4 + TanStack Query 5,