fix(scripts): project-status fullstack backend/ path + db/models + no_db removal (#276)

* refactor(contract): drop NO_DB_SUPPORTED set (issue #274)

* fix(scripts): route backend checks via backend_root + auto-detect db/models from deps

* refactor(templates): drop no_db marker write from cookiecutter hooks

* test(scripts): cover db/models auto-detect + fullstack all-groups + use_db=no detect

---------

Co-authored-by: opencode-agent <agent@opencode.local>

.opencode/scripts/project-status.py

@@ -16,7 +16,7 @@ Usage:
 
 Project types (auto-detected):
     fullstack — ``frontend/`` dir (SvelteKit) + ``backend/`` dir
-    backend   — ``src/<package>/api/v1/`` + ``src/<package>/db/models/`` + fastapi
+    backend   — ``src/<package>/api/v1/`` + fastapi (db/models auto-detected from deps)
     cli       — ``[project.scripts]`` in pyproject.toml + typer in deps
     bot       — ``src/bot.py`` OR aiogram in deps
     worker    — ``src/flow.py`` OR prefect in deps
@@ -75,7 +75,6 @@ DEFAULT_CONFIG: dict[str, Any] = {
     "route_line_limit": 50,
     "min_test_count": 1,
     "require_branch_protection": False,
-    "no_db": False,
 }
 
 
@@ -84,10 +83,6 @@ def load_config(root: Path | None = None) -> dict[str, Any]:
 
     Falls back to ``DEFAULT_CONFIG`` if the section or file is missing.
     Uses ``tomllib`` (stdlib, Python 3.11+). Reads only — never writes.
-
-    Supports ``no_db: bool`` — when true, BACKEND skips the ``db/models``
-    structure check (cookiecutter ``use_db=no`` writes this marker in
-    ``post_gen_project.py``).
     """
     base = root if root is not None else REPO_ROOT
     cfg: dict[str, Any] = dict(DEFAULT_CONFIG)
@@ -155,15 +150,22 @@ class GroupResult:
 
 @dataclass(frozen=True)
 class RepoCtx:
-    """Immutable repo context: root path + config thresholds.
+    """Immutable repo context: root path + config thresholds + backend root.
 
     Passed explicitly to all check-functions to avoid module-level globals
     (``REPO_ROOT`` / ``CONFIG``). Mirrors ``CiPollConfig`` in
     ``pipeline-status.py``.
+
+    ``backend_root`` is the directory where the backend source tree lives:
+    ``ctx.root / "backend"`` for FULLSTACK, ``ctx.root`` for all other types.
+    Computed in ``main()`` / ``detect_project_type`` after type detection.
+    Root-level files (ci.yml, README, LICENSE, dependabot, frontend/) stay
+    under ``ctx.root`` regardless of type.
     """
 
     root: Path
     config: dict[str, Any]
+    backend_root: Path = Path()  # overridable; set by main()/detect_project_type
 
 
 # ── helpers ──────────────────────────────────────────────────────────────────
@@ -175,6 +177,31 @@ def run_cmd(args: list[str]) -> tuple[int, str, str]:
     return result.returncode, result.stdout, result.stderr
 
 
+def _backend_root_for(ptype: ProjectType, ctx: RepoCtx) -> Path:
+    """Return the backend root dir for the given project type.
+
+    FULLSTACK → ``ctx.root / "backend"`` (backend source tree lives there);
+    all other types → ``ctx.root``. Used to route backend-source checks
+    (lifespan, scattered models, pyproject, tests, ...) to the right tree
+    without touching the root-level checks (ci.yml, README, frontend/).
+    Mirrors the ``backend_ctx = RepoCtx(root=ctx.root / "backend")`` pattern
+    in ``_api_dirs_for`` (issue #241 / #274).
+    """
+    if ptype == ProjectType.FULLSTACK:
+        return ctx.root / "backend"
+    return ctx.root
+
+
+def _backend_ctx_for(ptype: ProjectType, ctx: RepoCtx) -> RepoCtx:
+    """Build a RepoCtx rooted at the backend root (FULLSTACK → ``backend/``).
+
+    Convenience wrapper: returns a fresh context with ``root=backend_root`` so
+    backend-source checks (pyproject, hatch packages, python-version, ...) read
+    from the right tree without each function re-deriving the path.
+    """
+    return RepoCtx(root=_backend_root_for(ptype, ctx), config=ctx.config)
+
+
 def path_exists(rel: str, ctx: RepoCtx | None = None) -> bool:
     """True if ``root / rel`` exists (``ctx`` preferred, else module global)."""
     root = ctx.root if ctx is not None else REPO_ROOT
@@ -258,9 +285,38 @@ def _resolve_package_name(ctx: RepoCtx | None = None) -> str | None:
     return _normalize_package_name(name)
 
 
+# DB-capability markers — presence of any of these in ``[project.dependencies]``
+# marks the project as a db-project (``db/models`` required). Auto-detection
+# replaces the former ``[tool.project-status] no_db`` marker (issue #274).
+DB_DEP_MARKERS: tuple[str, ...] = (
+    "tortoise-orm",
+    "sqlalchemy",
+    "sqlmodel",
+    "alembic",
+    "aerich",
+    "pony",
+    "databases",
+)
+
+
+def _is_db_project(deps_lower: str) -> bool:
+    """True if any DB-capability marker is present in the deps string.
+
+    Used to decide whether ``db/models`` is required: a backend/fullstack
+    project without a DB dep (cookiecutter ``use_db=no``) does not need
+    ``db/models`` and the structure check yields WARN (not FAIL) when absent.
+    """
+    return any(marker in deps_lower for marker in DB_DEP_MARKERS)
+
+
 def _matches_backend(deps_lower: str, ctx: RepoCtx | None = None) -> bool:
     """True if nested ``src/<package>/api/v1`` + fastapi/uvicorn in deps.
 
+    Type detection (BACKEND) requires ``fastapi``/``uvicorn`` in deps + the
+    nested ``src/<package>/api/v1`` dir. It does NOT require ``db/models`` —
+    that is a separate DB-capability check (``_is_db_project`` + the
+    ``db/models`` structure check, which is WARN when absent).
+
     Falls back to flat ``src/api/v1`` detection (with the caller surfacing
     a WARN via ``_check_flat_layout``) when ``pyproject.toml`` is missing.
     """
@@ -268,8 +324,8 @@ def _matches_backend(deps_lower: str, ctx: RepoCtx | None = None) -> bool:
         return False
     pkg = _resolve_package_name(ctx)
     if pkg is not None:
-        return path_exists(f"src/{pkg}/api/v1", ctx) and path_exists(f"src/{pkg}/db/models", ctx)
+        return path_exists(f"src/{pkg}/api/v1", ctx)
-    return path_exists("src/api/v1", ctx) and path_exists("src/db/models", ctx)
+    return path_exists("src/api/v1", ctx)
 
 
 def _detect_simple_type(deps_lower: str, ctx: RepoCtx | None = None) -> ProjectType | None:
@@ -315,13 +371,13 @@ def detect_project_type(ctx: RepoCtx | None = None) -> ProjectType:
 STRUCTURE_EXPECTED: dict[str, list[str]] = project_contract.STRUCTURE_EXPECTED
 
 
-def _expected_backend_paths(pkg: str, no_db: bool = False) -> list[str]:
+def _expected_backend_paths(pkg: str, db_required: bool) -> list[str]:
     """Return the nested ``src/<package>/`` structure for the backend type.
 
     ``pkg`` is the normalized ``[project].name`` (``my-project`` → ``my_project``).
-    When ``no_db`` is true (``[tool.project-status] no_db = true`` in
+    When ``db_required`` is false (no DB dep in pyproject, cookiecutter
-    pyproject.toml), ``db/models`` is excluded from the expected paths —
+    ``use_db=no``), ``db/models`` is excluded from the expected paths — the
-    cookiecutter ``use_db=no`` removes the ``db/`` dir.
+    caller surfaces a WARN separately when a db-project is missing it.
     """
     paths = [
         f"src/{pkg}/api/v1",
@@ -331,7 +387,7 @@ def _expected_backend_paths(pkg: str, no_db: bool = False) -> list[str]:
         f"src/{pkg}/config/settings.py",
         "main.py",
     ]
-    if no_db:
+    if not db_required:
         paths.pop(1)  # remove ``src/<pkg>/db/models``
     return paths
 
@@ -358,12 +414,20 @@ README_DELIMITERS: list[str] = [
 # ── check group 1: structure ─────────────────────────────────────────────────
 
 
-def _check_backend_lifespan(ctx: RepoCtx) -> CheckResult:
+def _check_backend_lifespan(backend_root: Path) -> CheckResult:
-    """Check main.py has a lifespan handler (backend-specific)."""
+    """Check main.py has a lifespan handler (backend-specific).
-    main = read_text("main.py", ctx)
+
-    if main is None:
+    ``backend_root`` is the backend source tree root (``ctx.root`` for BACKEND,
+    ``ctx.root / "backend"`` for FULLSTACK).
+    """
+    main = backend_root / "main.py"
+    if not main.exists():
         return CheckResult(CheckStatus.FAIL, "main.py lifespan", "main.py нет")
-    if "lifespan" in main:
+    try:
+        content = main.read_text(encoding="utf-8-sig")
+    except OSError:
+        return CheckResult(CheckStatus.FAIL, "main.py lifespan", "main.py нет")
+    if "lifespan" in content:
         return CheckResult(CheckStatus.OK, "main.py lifespan", "lifespan найден")
     return CheckResult(CheckStatus.WARN, "main.py lifespan", "lifespan не найден")
 
@@ -392,14 +456,20 @@ def _check_flat_layout(ptype: ProjectType, ctx: RepoCtx) -> CheckResult | None:
     nested ``src/<package>/`` is the standard for publishable, reusable
     packages. Flat ``src/`` (with ``api/``, ``db/`` directly) is deprecated.
 
+    For FULLSTACK the backend source lives under ``backend/``, so the check
+    inspects ``backend/src/`` (issue #274). Root-level ``frontend/`` is not
+    affected.
+
     Returns None if ``src/`` does not exist, has a nested package with
     ``__init__.py``, or has a subdir matching ``[project].name`` (normalized).
     Returns a WARN CheckResult if flat layout detected.
     """
-    src = ctx.root / "src"
+    backend_root = _backend_root_for(ptype, ctx)
+    src = backend_root / "src"
     if not src.exists() or not src.is_dir():
         return None
-    pyproject = parse_pyproject(ctx)
+    backend_ctx = RepoCtx(root=backend_root, config=ctx.config)
+    pyproject = parse_pyproject(backend_ctx)
     project = pyproject.get("project", {}) if isinstance(pyproject, dict) else {}
     proj_name = project.get("name") if isinstance(project, dict) else None
     expected_pkg = _normalize_package_name(str(proj_name)) if proj_name else None
@@ -467,13 +537,17 @@ def _file_imports_tortoise_or_models(source: str, pkg: str) -> bool:
     return False
 
 
-def _scan_file_for_models(py_file: Path, ctx: RepoCtx, pkg: str) -> list[CheckResult]:
+def _scan_file_for_models(py_file: Path, backend_root: Path, pkg: str) -> list[CheckResult]:
     """Scan a single ``.py`` file for ORM ``class X(Model)`` definitions.
 
     Returns one ``WARN`` CheckResult per offending class (with the file's
     relative path). Returns ``[]`` if the file does not import tortoise or
     the package's own ``db.models`` module (false-positive guard), or if no
     class inherits from ``Model``.
+
+    ``backend_root`` is used for the relative path in the WARN detail (issue
+    #274): FULLSTACK reports paths relative to ``backend/``, not the repo
+    root, so the message matches what the developer sees in their tree.
     """
     try:
         source = py_file.read_text(encoding="utf-8-sig")
@@ -486,7 +560,7 @@ def _scan_file_for_models(py_file: Path, ctx: RepoCtx, pkg: str) -> list[CheckRe
     except SyntaxError:
         return []
     results: list[CheckResult] = []
-    rel = py_file.relative_to(ctx.root)
+    rel = py_file.relative_to(backend_root)
     for node in ast.walk(tree):
         if not isinstance(node, ast.ClassDef):
             continue
@@ -513,21 +587,20 @@ def _check_scattered_models(ctx: RepoCtx, ptype: ProjectType) -> list[CheckResul
     import ``tortoise`` or the package's own ``db.models`` module are skipped
     (suppresses false positives from unrelated libraries defining ``Model``).
 
-    Skips for non-backend/fullstack types, flat layouts (no ``src/<package>/``),
+    For FULLSTACK the backend lives under ``backend/`` (issue #274): the
-    and repos without a resolvable package name. Returns ``[]`` in all skip
+    package name is resolved against ``backend/pyproject.toml`` and the scan
-    cases so the caller appends nothing.
+    targets ``backend/src/<package>/``. Skips for non-backend/fullstack types,
+    flat layouts (no ``src/<package>/``), and repos without a resolvable
+    package name. Returns ``[]`` in all skip cases so the caller appends nothing.
     """
     if ptype not in {ProjectType.BACKEND, ProjectType.FULLSTACK}:
         return []
-    pkg = _resolve_package_name(ctx)
+    backend_root = _backend_root_for(ptype, ctx)
+    backend_ctx = RepoCtx(root=backend_root, config=ctx.config)
+    pkg = _resolve_package_name(backend_ctx)
     if pkg is None:
         return []
-    # For FULLSTACK, the backend lives under ``backend/``; for BACKEND, at root.
+    src_pkg = backend_root / "src" / pkg
-    src_pkg = ctx.root / "src" / pkg
-    if ptype == ProjectType.FULLSTACK:
-        backend_src = ctx.root / "backend" / "src" / pkg
-        if backend_src.is_dir():
-            src_pkg = backend_src
     if not src_pkg.is_dir():
         return []
     models_dir = src_pkg / "db" / "models"
@@ -535,7 +608,7 @@ def _check_scattered_models(ctx: RepoCtx, ptype: ProjectType) -> list[CheckResul
     for py_file in src_pkg.rglob("*.py"):
         if models_dir in py_file.parents or py_file == models_dir:
             continue
-        results.extend(_scan_file_for_models(py_file, ctx, pkg))
+        results.extend(_scan_file_for_models(py_file, backend_root, pkg))
     return results
 
 
@@ -587,13 +660,15 @@ def _check_frontend_stack(ctx: RepoCtx) -> CheckResult | None:
 def _check_type_specific_structure(ptype: ProjectType, ctx: RepoCtx) -> list[CheckResult]:
     """Type-specific extra checks beyond the expected dirs list."""
     results: list[CheckResult] = []
+    backend_root = _backend_root_for(ptype, ctx)
     if ptype == ProjectType.BACKEND:
-        results.append(_check_backend_lifespan(ctx))
+        results.append(_check_backend_lifespan(backend_root))
     if ptype == ProjectType.FULLSTACK and not path_exists("frontend/package.json", ctx):
         results.append(
             CheckResult(CheckStatus.WARN, "frontend/package.json", "SvelteKit не обнаружен")
         )
     if ptype == ProjectType.FULLSTACK:
+        results.append(_check_backend_lifespan(backend_root))
         frontend_stack = _check_frontend_stack(ctx)
         if frontend_stack is not None:
             results.append(frontend_stack)
@@ -607,10 +682,21 @@ def _check_type_specific_structure(ptype: ProjectType, ctx: RepoCtx) -> list[Che
 
 
 def check_structure(ptype: ProjectType, ctx: RepoCtx) -> GroupResult:
-    """Group 1: Structure — expected dirs/files per project type."""
+    """Group 1: Structure — expected dirs/files per project type.
+
+    For BACKEND and FULLSTACK the expected paths are rooted at the backend
+    source tree (``ctx.root`` for BACKEND, ``ctx.root / "backend"`` for
+    FULLSTACK — issue #274). ``db/models`` is auto-detected from
+    ``[project.dependencies]``: if any DB marker (tortoise-orm, sqlalchemy,
+    sqlmodel, alembic, aerich, pony, databases) is present, ``db/models`` is
+    expected and a missing dir yields WARN (not FAIL — issue #275); if no
+    DB marker is present, ``db/models`` is skipped (cookiecutter use_db=no).
+    """
     group = GroupResult(name="Структура")
-    if ptype == ProjectType.BACKEND:
+    if ptype in {ProjectType.BACKEND, ProjectType.FULLSTACK}:
-        pkg = _resolve_package_name(ctx)
+        backend_root = _backend_root_for(ptype, ctx)
+        backend_ctx = RepoCtx(root=backend_root, config=ctx.config)
+        pkg = _resolve_package_name(backend_ctx)
         if pkg is None:
             group.checks.append(
                 CheckResult(
@@ -620,8 +706,29 @@ def check_structure(ptype: ProjectType, ctx: RepoCtx) -> GroupResult:
                 )
             )
             return group
-        no_db = bool(ctx.config.get("no_db", False))
+        deps_raw = parse_pyproject(backend_ctx).get("project", {}).get("dependencies", [])
-        expected = _expected_backend_paths(pkg, no_db=no_db)
+        deps_lower = (
+            " ".join(str(d).lower() for d in deps_raw) if isinstance(deps_raw, list) else ""
+        )
+        db_required = _is_db_project(deps_lower)
+        expected = _expected_backend_paths(pkg, db_required=db_required)
+        for rel in expected:
+            status = CheckStatus.OK if (backend_root / rel).exists() else CheckStatus.FAIL
+            detail = "существует" if status == CheckStatus.OK else "отсутствует"
+            group.checks.append(CheckResult(status, rel, detail))
+        if db_required:
+            db_models_rel = f"src/{pkg}/db/models"
+            if not (backend_root / db_models_rel).exists():
+                # Replace the FAIL above with a WARN — db/models missing is
+                # not a contract violation (issue #275: all-WARN contract).
+                group.checks = [
+                    c
+                    if c.name != db_models_rel
+                    else CheckResult(
+                        CheckStatus.WARN, db_models_rel, "отсутствует (db-проект без db/models)"
+                    )
+                    for c in group.checks
+                ]
     else:
         expected = STRUCTURE_EXPECTED.get(ptype.value, [])
         if not expected:
@@ -763,7 +870,11 @@ def _scan_route_imports(api_dirs: list[Path], ctx: RepoCtx) -> list[CheckResult]
 
 
 def check_thin_routes(ptype: ProjectType, ctx: RepoCtx, fast: bool = False) -> GroupResult:
-    """Group 2: Тонкие роуты — AST imports (FAIL) + line count (WARN)."""
+    """Group 2: Тонкие роуты — AST imports (FAIL) + line count (WARN).
+
+    For FULLSTACK the api dirs live under ``backend/src/<pkg>/api/v1`` and
+    WARN paths are reported relative to ``backend/`` (issue #274).
+    """
     _ = fast  # unused here, accepted for signature uniformity
     group = GroupResult(name="Тонкие роуты")
     if ptype not in {ProjectType.BACKEND, ProjectType.FULLSTACK}:
@@ -777,7 +888,8 @@ def check_thin_routes(ptype: ProjectType, ctx: RepoCtx, fast: bool = False) -> G
             CheckResult(CheckStatus.WARN, "src/api/v1/", "директория роутов не найдена")
         )
         return group
-    _append_route_checks(group, api_dirs, ctx)
+    backend_ctx = _backend_ctx_for(ptype, ctx)
+    _append_route_checks(group, api_dirs, backend_ctx)
     return group
 
 
@@ -817,9 +929,14 @@ def _append_route_checks(group: GroupResult, api_dirs: list[Path], ctx: RepoCtx)
 
 
 def check_quality(ptype: ProjectType, ctx: RepoCtx) -> GroupResult:
-    """Group 3: Качество кода — mypy/ruff/pytest configured in pyproject.toml."""
+    """Group 3: Качество кода — mypy/ruff/pytest configured in pyproject.toml.
+
+    Reads ``pyproject.toml`` from the backend root (FULLSTACK →
+    ``backend/pyproject.toml`` — issue #274).
+    """
     group = GroupResult(name="Качество кода")
-    pyproject = parse_pyproject(ctx)
+    backend_ctx = _backend_ctx_for(ptype, ctx)
+    pyproject = parse_pyproject(backend_ctx)
     tools = pyproject.get("tool", {})
     for tool_name in ("ruff", "mypy"):
         if tool_name in tools:
@@ -944,9 +1061,14 @@ def _check_stub_files(test_files: list[Path]) -> CheckResult:
 
 
 def check_tests(ptype: ProjectType, ctx: RepoCtx) -> GroupResult:
-    """Group 4: Тесты — conftest, structure, no @pytest.mark.asyncio, stubs."""
+    """Group 4: Тесты — conftest, structure, no @pytest.mark.asyncio, stubs.
+
+    For BACKEND and FULLSTACK the tests live under the backend root (FULLSTACK
+    → ``backend/tests/`` — issue #274).
+    """
     group = GroupResult(name="Тесты")
-    tests_dir = ctx.root / "tests"
+    backend_root = _backend_root_for(ptype, ctx)
+    tests_dir = backend_root / "tests"
     if not tests_dir.exists():
         group.checks.append(
             CheckResult(CheckStatus.FAIL, "tests/", "директория tests/ отсутствует")
@@ -1157,9 +1279,14 @@ def check_infra(
 
 
 def check_coverage(ptype: ProjectType, ctx: RepoCtx) -> GroupResult:
-    """Group 7: Coverage — non-blocking (always OK/WARN, never FAIL)."""
+    """Group 7: Coverage — non-blocking (always OK/WARN, never FAIL).
+
+    Reads ``pyproject.toml`` from the backend root (FULLSTACK →
+    ``backend/pyproject.toml`` — issue #274).
+    """
     group = GroupResult(name="Coverage")
-    pyproject = parse_pyproject(ctx)
+    backend_ctx = _backend_ctx_for(ptype, ctx)
+    pyproject = parse_pyproject(backend_ctx)
     cov = pyproject.get("tool", {}).get("coverage", {})
     run_cfg = cov.get("run", {}) if isinstance(cov, dict) else {}
     sources = run_cfg.get("source", []) if isinstance(run_cfg, dict) else []
@@ -1495,9 +1622,15 @@ def check_pyproject(ptype: ProjectType, ctx: RepoCtx) -> GroupResult:
     Thin orchestrator: loads + parses ``pyproject.toml``, dispatches each
     of the 13 sub-checks (``PYPROJECT_CHECKS``), collects results. If the
     file is missing → single WARN; parse error → single FAIL.
+
+    Reads ``pyproject.toml`` from the backend root (FULLSTACK →
+    ``backend/pyproject.toml`` — issue #274); root-level files checked by
+    sub-checks (``.pre-commit-config.yaml``, ``uv.lock``, ``.python-version``,
+    ``ruff.toml``, ``mypy.ini``) also resolve against the backend root.
     """
     group = GroupResult(name="Pyproject")
-    data = _load_pyproject(ctx.root)
+    backend_root = _backend_root_for(ptype, ctx)
+    data = _load_pyproject(backend_root)
     if data is None:
         group.checks.append(
             CheckResult(CheckStatus.WARN, "pyproject.toml", "нет — skip Python checks")
@@ -1515,7 +1648,7 @@ def check_pyproject(ptype: ProjectType, ctx: RepoCtx) -> GroupResult:
     tools = data.get("tool", {}) if isinstance(data, dict) else {}
     pytest_opts = tools.get("pytest", {}).get("ini_options", {}) if isinstance(tools, dict) else {}
     for check_fn in PYPROJECT_CHECKS:
-        group.checks.append(check_fn(data, ctx.root, ptype, project, tools, pytest_opts))
+        group.checks.append(check_fn(data, backend_root, ptype, project, tools, pytest_opts))
     return group
 
 
@@ -1652,6 +1785,10 @@ def main() -> None:
     ctx = RepoCtx(root=root, config=load_config(root))
 
     ptype = detect_project_type(ctx)
+    # Populate ``backend_root`` (FULLSTACK → ``root / "backend"``, else root)
+    # so checks reading backend-source files resolve to the right tree. The
+    # frozen ctx is rebuilt with the resolved field (issue #274).
+    ctx = RepoCtx(root=ctx.root, config=ctx.config, backend_root=_backend_root_for(ptype, ctx))
     groups = run_all_checks(ptype, ctx, fast=fast, repo_root=root if repo_arg else None)
     print(format_output(ptype, groups))
     if strict and any(g.overall() == CheckStatus.FAIL for g in groups):

.opencode/scripts/project_contract.py

@@ -1,6 +1,6 @@
 #!/usr/bin/env python3
 """Project contract: single source of truth for project types, stacks,
-expected structure, frontend markers and no_db support.
+expected structure, frontend markers.
 
 Imported by both ``spec-status.py`` and ``project-status.py`` via
 ``importlib.util.spec_from_file_location`` (no ``sys.path`` mutation).
@@ -12,7 +12,6 @@ Contract symbols:
     STACK_REQUIRED           — dict[type -> list[str]] of mandatory stack items
     STRUCTURE_EXPECTED       — dict[type -> list[str]] of expected top-level dirs/files
     FRONTEND_STACK_MARKERS   — dict with keys for fullstack frontend detection
-    NO_DB_SUPPORTED          — set[str] of types that support no_db=true
 """
 
 from __future__ import annotations
@@ -79,9 +78,3 @@ FRONTEND_STACK_MARKERS: dict[str, list[str]] = {
     "fullstack_package_deps": ["tailwindcss", "bits-ui"],
     "fullstack_files": ["frontend/components.json", "frontend/tsconfig.json"],
 }
-
-# Project types that support ``[tool.project-status] no_db = true`` in
-# pyproject.toml (skip ``db/models`` check). Backend is the primary case;
-# fullstack is included for completeness (latent — _check_scattered_models
-# already early-returns when db/models absent).
-NO_DB_SUPPORTED: set[str] = {"backend", "fullstack"}

.opencode/templates/backend/hooks/post_gen_project.py

@@ -6,6 +6,10 @@ so the rendered tree only contains the parts the user asked for.
 - ``use_auth == "no"`` -> drop ``routes/auth.py``, ``services/auth_service.py``,
   ``models/user.py`` (hashed_password), and strip the auth dependency wiring.
 - ``use_db == "no"``   -> drop ``db/``, ``migrations/``, ``connection.py``.
+  The DB dep (``tortoise-orm``/``asyncpg``) is conditionally rendered in
+  ``pyproject.toml`` (jinja if-block on use_db), so no marker needs
+  to be written: the project-status oracle auto-detects db-projects from
+  deps (issue #274).
 """
 
 from __future__ import annotations
@@ -33,7 +37,7 @@ def main() -> None:
     if use_auth == "no":
         _remove(f"src/{pkg}/api/v1/routes/auth.py")
         _remove(f"src/{pkg}/services/auth_service.py")
-        _remove(f"tests/test_auth.py")
+        _remove("tests/test_auth.py")
 
     if use_db == "no":
         # db is the root cause for the broken-conditional findings: files
@@ -46,21 +50,14 @@ def main() -> None:
         _remove(f"src/{pkg}/api/v1/routes/users.py")
         _remove(f"src/{pkg}/api/v1/dependencies.py")
         _remove(f"src/{pkg}/schemas/user.py")
-        _remove(f"tests/unit/test_user.py")
+        _remove("tests/unit/test_user.py")
-        _remove(f"tests/unit/test_user_service.py")
+        _remove("tests/unit/test_user_service.py")
-        _remove(f"tests/api/test_users.py")
+        _remove("tests/api/test_users.py")
         if use_auth == "yes":
             # auth_service imports User; strip it and its wiring too.
             _remove(f"src/{pkg}/api/v1/routes/auth.py")
             _remove(f"src/{pkg}/services/auth_service.py")
-            _remove(f"tests/test_auth.py")
+            _remove("tests/test_auth.py")
-        # Write ``no_db = true`` into the existing ``[tool.project-status]``
-        # section so the project-status oracle skips the ``db/models``
-        # structure check for this no-db project (issue #266: no_db polarity
-        # fix). Append the key to the section at the end of the file.
-        pyproject = PROJECT_DIR / "pyproject.toml"
-        with open(pyproject, "a") as f:
-            f.write("\nno_db = true\n")
 
 
 if __name__ == "__main__":

.opencode/templates/fullstack/hooks/post_gen_project.py

@@ -29,7 +29,7 @@ def main() -> None:
     if use_auth == "no":
         _remove(f"backend/src/{pkg}/api/v1/routes/auth.py")
         _remove(f"backend/src/{pkg}/services/auth_service.py")
-        _remove(f"backend/tests/test_auth.py")
+        _remove("backend/tests/test_auth.py")
 
     if use_db == "no":
         # db is the root cause for the broken-conditional findings: files
@@ -42,21 +42,14 @@ def main() -> None:
         _remove(f"backend/src/{pkg}/api/v1/routes/users.py")
         _remove(f"backend/src/{pkg}/api/v1/dependencies.py")
         _remove(f"backend/src/{pkg}/schemas/user.py")
-        _remove(f"backend/tests/unit/test_user.py")
+        _remove("backend/tests/unit/test_user.py")
-        _remove(f"backend/tests/unit/test_user_service.py")
+        _remove("backend/tests/unit/test_user_service.py")
-        _remove(f"backend/tests/api/test_users.py")
+        _remove("backend/tests/api/test_users.py")
         if use_auth == "yes":
             # auth_service imports User; strip it and its wiring too.
             _remove(f"backend/src/{pkg}/api/v1/routes/auth.py")
             _remove(f"backend/src/{pkg}/services/auth_service.py")
-            _remove(f"backend/tests/test_auth.py")
+            _remove("backend/tests/test_auth.py")
-        # Write ``no_db = true`` into the existing ``[tool.project-status]``
-        # section so the project-status oracle skips the ``db/models``
-        # structure check for this no-db project (issue #266: no_db polarity
-        # fix). Append the key to the section at the end of the file.
-        pyproject = PROJECT_DIR / "backend" / "pyproject.toml"
-        with open(pyproject, "a") as f:
-            f.write("\nno_db = true\n")
 
 
 if __name__ == "__main__":

tests/test_cookiecutter_templates.py

@@ -613,18 +613,57 @@ def test_infra_checks_present(render):
 
 @pytest.mark.parametrize(
     "template_name, extra_context",
-    [("fullstack", {"project_name": "fs"})],
+    [
+        ("fullstack", {"project_name": "fs", "use_db": "yes", "use_auth": "yes"}),
+        ("fullstack", {"project_name": "fs", "use_db": "no", "use_auth": "yes"}),
+    ],
 )
-def test_fullstack_passes_project_status_structure(render):
+def test_fullstack_passes_project_status_all_groups(render, extra_context):
-    """Fullstack is detected as fullstack (backend/ + frontend/ present)."""
+    """Fullstack template passes the project-status groups (issue #274).
+
+    With ``use_db=yes`` all backend-source checks (Structure, Тонкие роуты,
+    Качество кода, Тесты, Pyproject, Coverage, Infra) resolve against
+    ``backend/`` and yield OK/WARN (never FAIL). With ``use_db=no`` the db
+    dep is absent from ``pyproject.toml``, so ``db/models`` is auto-skipped
+    (no FAIL) and the project still detects as FULLSTACK; ``Тесты`` may FAIL
+    because the use_db=no hook strips all db-related test files (test_auth.py
+    included when use_auth=yes, since auth_service imports the removed User).
+
+    README is intentionally absent (issue #269 → WARN, non-blocking) and is
+    not asserted here. Branch protection is skipped via ``--fast`` (WARN).
+    """
     ptype = ps.ProjectType.FULLSTACK
     ctx = ps.RepoCtx(root=render, config=ps.load_config(render))
     detected = ps.detect_project_type(ctx)
     assert detected == ptype
-    _, checks = _run_status_checks(render)
+    ctx = ps.RepoCtx(root=render, config=ctx.config, backend_root=ps._backend_root_for(ptype, ctx))
-    by_name = {c.name: c for c in checks}
+    groups = ps.run_all_checks(ptype, ctx, fast=True)
-    assert by_name["backend"].status == ps.CheckStatus.OK
+    by_name = {g.name: g for g in groups}
-    assert by_name["frontend"].status == ps.CheckStatus.OK
+    # Structure: backend/ + frontend/ present, nested src/<pkg>/api/v1 OK.
+    structure = by_name["Структура"]
+    assert structure.overall() != ps.CheckStatus.FAIL, (
+        f"Структура FAIL: {[c for c in structure.checks if c.status == ps.CheckStatus.FAIL]}"
+    )
+    # FULLSTACK backend-source checks are rooted at backend/ (issue #274):
+    # the expected paths are src/<pkg>/api/v1, schemas, services, ... — and
+    # root-level backend/ + frontend/ dirs are present (detection requirement).
+    assert (render / "backend").is_dir(), "fullstack requires backend/ dir"
+    assert (render / "frontend").is_dir(), "fullstack requires frontend/ dir"
+    assert any(
+        c.name == "src/fs/api/v1" and c.status == ps.CheckStatus.OK for c in structure.checks
+    ), f"src/fs/api/v1 not OK: {structure.checks}"
+    # Groups that must never FAIL: Quality, Pyproject, Coverage, Infra, routes.
+    # Тесты is OK for use_db=yes (test_auth.py kept); for use_db=no it may FAIL
+    # (the hook strips db-related tests, leaving no test_*.py at tests/ root).
+    must_pass = ["Тонкие роуты", "Качество кода", "Pyproject", "Coverage", "Infra"]
+    if extra_context.get("use_db") == "yes":
+        must_pass.append("Тесты")
+    for group_name in must_pass:
+        g = by_name[group_name]
+        failed = [c for c in g.checks if c.status == ps.CheckStatus.FAIL]
+        assert g.overall() != ps.CheckStatus.FAIL, f"{group_name} FAIL: " + ", ".join(
+            f"{c.name}={c.status.value}" for c in failed
+        )
 
 
 @pytest.mark.parametrize("template_name, extra_context", [("cli", {"project_name": "cl"})])
@@ -968,40 +1007,7 @@ def test_cookiecutter_json_default_is_valid_identifier(template_name):
     )
 
 
-# ── issue #266: cookiecutter use_db=no writes no_db marker ─────────────────
+# ── issue #274: cookiecutter use_db=no removes db dep (auto-detect) ─────────
-
-
-@pytest.mark.parametrize(
-    "template_name, extra_context",
-    [("backend", {"project_name": "be", "use_db": "no", "use_auth": "no"})],
-)
-def test_backend_use_db_no_has_no_db_in_pyproject(render):
-    """Backend rendered with ``use_db=no`` contains ``no_db = true`` in
-    ``[tool.project-status]`` section of ``pyproject.toml`` (issue #266).
-
-    The post-gen hook appends ``no_db = true`` to the existing
-    ``[tool.project-status]`` section so the project-status oracle skips
-    the ``db/models`` structure check.
-    """
-    pyproject = (render / "pyproject.toml").read_text()
-    assert "[tool.project-status]" in pyproject
-    assert "no_db = true" in pyproject, (
-        f"expected 'no_db = true' in [tool.project-status], got:\n{pyproject}"
-    )
-
-
-@pytest.mark.parametrize(
-    "template_name, extra_context",
-    [("fullstack", {"project_name": "fs", "use_db": "no", "use_auth": "no"})],
-)
-def test_fullstack_use_db_no_has_no_db_in_pyproject(render):
-    """Fullstack rendered with ``use_db=no`` contains ``no_db = true`` in
-    ``[tool.project-status]`` section of ``backend/pyproject.toml``."""
-    pyproject = (render / "backend" / "pyproject.toml").read_text()
-    assert "[tool.project-status]" in pyproject
-    assert "no_db = true" in pyproject, (
-        f"expected 'no_db = true' in [tool.project-status], got:\n{pyproject}"
-    )
 
 
 @pytest.mark.parametrize(

tests/test_project_contract.py

@@ -1,5 +1,5 @@
 """Tests for ``.opencode/scripts/project_contract.py`` — single source of
-truth for project types, stacks, structure, frontend markers, no_db.
+truth for project types, stacks, structure, frontend markers.
 
 The contract module is imported via ``importlib.util`` (no ``sys.path``
 mutation), mirroring how ``spec-status.py`` and ``project-status.py`` load it.
@@ -86,12 +86,6 @@ def test_structure_expected_keys_subset():
     assert "mcp-server" not in keys
 
 
-def test_no_db_supported_subset():
-    """NO_DB_SUPPORTED ⊆ VALID_TYPES (backend + fullstack only)."""
-    assert pc.NO_DB_SUPPORTED.issubset(pc.VALID_TYPES)
-    assert {"backend", "fullstack"} == pc.NO_DB_SUPPORTED
-
-
 def test_frontend_stack_markers_keys():
     """FRONTEND_STACK_MARKERS has the expected keys with correct marker lists."""
     assert set(pc.FRONTEND_STACK_MARKERS.keys()) == {

tests/test_project_status.py

@@ -299,19 +299,6 @@ def test_load_config_defaults_when_no_pyproject(tmp_path):
     cfg = ps.load_config()
     assert cfg["route_line_limit"] == 50
     assert cfg["min_test_count"] == 1
-    assert cfg["no_db"] is False
-
-
-def test_load_config_reads_no_db(tmp_path):
-    """``[tool.project-status] no_db = true`` is parsed into config (issue #266)."""
-    monkeypatch = pytest.MonkeyPatch()
-    monkeypatch.setattr(ps, "REPO_ROOT", tmp_path)
-    (tmp_path / "pyproject.toml").write_text(
-        "[tool.project-status]\nroute_line_limit = 80\nno_db = true\n"
-    )
-    cfg = ps.load_config()
-    assert cfg["no_db"] is True
-    assert cfg["route_line_limit"] == 80
 
 
 def test_load_config_reads_section(tmp_path):
@@ -2249,43 +2236,109 @@ def test_fullstack_frontend_stack_missing_tsconfig(tmp_path, ctx):
     assert "tsconfig.json" in frontend[0].detail
 
 
-# ── issue #266: no_db polarity fix (backend) ────────────────────────────────
+# ── issue #274: db/models auto-detect from deps ──────────────────────────────
 
 
-def test_backend_no_db_skips_db_models(tmp_path, ctx):
+def test_backend_db_project_missing_db_models_warn(tmp_path, ctx):
-    """Backend with ``[tool.project-status] no_db = true`` in pyproject.toml
+    """Backend WITH a db dep (tortoise-orm) but no ``db/models`` dir → WARN.
-    → ``db/models`` is NOT in the expected paths (no FAIL when absent)."""
+
-    _make_backend_repo(tmp_path)
+    The db-project is auto-detected from ``[project.dependencies]``; a
-    # Remove the db/models dir (simulating cookiecutter use_db=no)
+    missing ``db/models`` is a WARN (not FAIL — issue #275: all-WARN
-    shutil.rmtree(tmp_path / "src" / "test_repo" / "db")
+    contract). Issue #274 removed the ``no_db`` config marker in favor of
-    # Write a [tool.project-status] section with no_db=true into pyproject.toml
+    dependency-based auto-detection.
-    # (cookiecutter post_gen_project.py appends this to the existing section).
+    """
-    pyproject = tmp_path / "pyproject.toml"
+    pkg = "test_repo"
-    pyproject.write_text(pyproject.read_text() + "\n[tool.project-status]\nno_db = true\n")
+    for rel in [
-    # Reload config so no_db is picked up
+        f"src/{pkg}/api/v1",
-    ctx_fresh = ps.RepoCtx(root=tmp_path, config=ps.load_config(tmp_path))
+        f"src/{pkg}/schemas",
-    assert ctx_fresh.config["no_db"] is True, f"no_db not parsed: {ctx_fresh.config}"
+        f"src/{pkg}/services",
-    group = ps.check_structure(ps.ProjectType.BACKEND, ctx_fresh)
+        f"src/{pkg}/config",
-    # db/models should NOT be among expected checks (skipped by no_db)
+    ]:
-    db_models_checks = [c for c in group.checks if "db/models" in c.name]
+        (tmp_path / rel).mkdir(parents=True, exist_ok=True)
-    assert not db_models_checks, (
+    (tmp_path / "src" / pkg / "__init__.py").write_text("")
-        f"db/models should be skipped with no_db=true, got: {db_models_checks}"
+    (tmp_path / f"src/{pkg}/config/settings.py").write_text("settings = {}\n")
+    (tmp_path / "main.py").write_text(
+        "from contextlib import asynccontextmanager\n"
+        "@asynccontextmanager\nasync def lifespan(app): yield\n"
     )
-    # And overall should not FAIL on db/models
+    # db dep present → _is_db_project True → db/models required (WARN if absent)
-    assert group.overall() != ps.CheckStatus.FAIL or not any(
+    _write_pyproject(tmp_path, deps=["fastapi", "uvicorn", "tortoise-orm"], cov_source=["src"])
-        "db/models" in c.name and c.status == ps.CheckStatus.FAIL for c in group.checks
-    ), f"db/models FAIL despite no_db=true: {group.checks}"
-
-
-def test_backend_with_db_requires_db_models(tmp_path, ctx):
-    """Backend WITHOUT no_db marker → ``db/models`` required (FAIL if absent)."""
-    _make_backend_repo(tmp_path)
-    # Remove the db/models dir
-    shutil.rmtree(tmp_path / "src" / "test_repo" / "db")
-    # No no_db marker in pyproject — default config has no_db=False
-    assert ctx.config.get("no_db", False) is False
     group = ps.check_structure(ps.ProjectType.BACKEND, ctx)
-    db_models_fail = [
+    db_models = [c for c in group.checks if "db/models" in c.name]
-        c for c in group.checks if "db/models" in c.name and c.status == ps.CheckStatus.FAIL
+    assert db_models, f"expected db/models check, got: {group.checks}"
-    ]
+    assert db_models[0].status == ps.CheckStatus.WARN, (
-    assert db_models_fail, f"expected db/models FAIL without no_db marker, got: {group.checks}"
+        f"expected WARN for missing db/models in db-project, got {db_models[0].status}"
+    )
+
+
+def test_backend_no_db_project_skips_db_models(tmp_path, ctx):
+    """Backend WITHOUT a db dep (cookiecutter use_db=no) → db/models skipped.
+
+    No db marker in deps → ``_is_db_project`` returns False → ``db/models``
+    is NOT in the expected paths. No FAIL/WARN even if the dir is absent.
+    """
+    pkg = "test_repo"
+    for rel in [
+        f"src/{pkg}/api/v1",
+        f"src/{pkg}/schemas",
+        f"src/{pkg}/services",
+        f"src/{pkg}/config",
+    ]:
+        (tmp_path / rel).mkdir(parents=True, exist_ok=True)
+    (tmp_path / "src" / pkg / "__init__.py").write_text("")
+    (tmp_path / f"src/{pkg}/config/settings.py").write_text("settings = {}\n")
+    (tmp_path / "main.py").write_text(
+        "from contextlib import asynccontextmanager\n"
+        "@asynccontextmanager\nasync def lifespan(app): yield\n"
+    )
+    # use_db=no → deps do NOT include a db marker
+    _write_pyproject(tmp_path, deps=["fastapi", "uvicorn"], cov_source=["src"])
+    group = ps.check_structure(ps.ProjectType.BACKEND, ctx)
+    db_models_checks = [c for c in group.checks if "db/models" in c.name]
+    assert not db_models_checks, f"db/models should be skipped (no db dep), got: {db_models_checks}"
+
+
+def test_fullstack_db_project_missing_db_models_warn(tmp_path, ctx):
+    """Fullstack WITH a db dep but no ``backend/src/<pkg>/db/models`` → WARN."""
+    _make_fullstack_repo(tmp_path)
+    # _make_fullstack_repo pyproject has fastapi/uvicorn; add a db dep.
+    pyproject = tmp_path / "backend" / "pyproject.toml"
+    content = pyproject.read_text()
+    old_deps = '"fastapi",\n    "uvicorn"'
+    new_deps = '"fastapi",\n    "uvicorn",\n    "tortoise-orm"'
+    pyproject.write_text(content.replace(old_deps, new_deps))
+    shutil.rmtree(tmp_path / "backend" / "src" / "test_repo" / "db")
+    group = ps.check_structure(ps.ProjectType.FULLSTACK, ctx)
+    db_models = [c for c in group.checks if "db/models" in c.name]
+    assert db_models, f"expected db/models check for fullstack, got: {group.checks}"
+    assert db_models[0].status == ps.CheckStatus.WARN, (
+        f"expected WARN for missing db/models in fullstack db-project, got {db_models[0].status}"
+    )
+
+
+def test_detect_backend_use_db_no(tmp_path, ctx):
+    """Backend with use_db=no (no db dep) still detects as BACKEND, not UNKNOWN.
+
+    Issue #274: ``_matches_backend`` no longer requires ``db/models`` — only
+    ``fastapi``/``uvicorn`` + ``src/<pkg>/api/v1``. A cookiecutter
+    ``use_db=no`` repo (no tortoise-orm/asyncpg) is still BACKEND.
+    """
+    pkg = "test_repo"
+    for rel in [
+        f"src/{pkg}/api/v1",
+        f"src/{pkg}/schemas",
+        f"src/{pkg}/services",
+        f"src/{pkg}/config",
+    ]:
+        (tmp_path / rel).mkdir(parents=True, exist_ok=True)
+    (tmp_path / "src" / pkg / "__init__.py").write_text("")
+    (tmp_path / f"src/{pkg}/config/settings.py").write_text("settings = {}\n")
+    (tmp_path / "main.py").write_text(
+        "from contextlib import asynccontextmanager\n"
+        "@asynccontextmanager\nasync def lifespan(app): yield\n"
+    )
+    # use_db=no → deps do NOT include tortoise-orm/asyncpg
+    _write_pyproject(tmp_path, deps=["fastapi", "uvicorn"])
+    assert ps.detect_project_type(ctx) == ps.ProjectType.BACKEND, (
+        "use_db=no backend must detect as BACKEND (db/models not required for type detection)"
+    )