Fix build failures and get all 45 tests passing

Build fixes:
- ui/Dockerfile: npm install instead of npm ci (no lockfile)
- api/pyproject.toml: setuptools.build_meta instead of setuptools.backends.legacy:build
- api/Dockerfile: install curl so the Docker healthcheck doesn't always fail
- docker-compose.yml: add start_period: 30s to API healthcheck

Test fixes:
- pyproject.toml: asyncio_default_fixture_loop_scope/test_loop_scope = session to
  prevent asyncpg connections being used across different event loops
- conftest.py: loop_scope="session" on session-scoped engine fixture
- main.py: custom HTTPException handler to flatten dict details to top level
  (FastAPI wraps dict details as {"detail": {...}} by default)
- test_upload.py: use env var + cache_clear() to override max_upload_bytes since
  monkeypatch can't reach past @lru_cache and already-imported references
- image_repo.py: add reload_with_tags() with populate_existing=True to force
  SQLAlchemy to repopulate the identity-map object after tag mutations
- images.py: use reload_with_tags() instead of db.refresh(image, ["image_tags"])
  which only loaded ImageTag rows without their .tag sub-relationship, causing
  MissingGreenlet on any access to image.tags after attach/replace operations

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

api/Dockerfile

@@ -2,6 +2,8 @@ FROM python:3.12-slim
 
 WORKDIR /app
 
+RUN apt-get update && apt-get install -y --no-install-recommends curl && rm -rf /var/lib/apt/lists/*
+
 RUN pip install --no-cache-dir uv
 
 COPY pyproject.toml .

api/app/main.py

@@ -1,6 +1,8 @@
 from contextlib import asynccontextmanager
 
-from fastapi import FastAPI
+from fastapi import FastAPI, Request
+from fastapi.exceptions import HTTPException
+from fastapi.responses import JSONResponse
 
 from app.config import get_settings
 from app.database import get_engine, get_session_factory, Base
@@ -21,6 +23,13 @@ async def lifespan(application: FastAPI):
 app = FastAPI(title="Reactbin API", version="1.0.0", lifespan=lifespan)
 
 
+@app.exception_handler(HTTPException)
+async def http_exception_handler(request: Request, exc: HTTPException):
+    if isinstance(exc.detail, dict):
+        return JSONResponse(status_code=exc.status_code, content=exc.detail)
+    return JSONResponse(status_code=exc.status_code, content={"detail": exc.detail})
+
+
 @app.get("/api/v1/health")
 async def health():
     return {"status": "ok"}

api/app/repositories/image_repo.py

@@ -79,6 +79,15 @@ class ImageRepository:
         result = await self._session.execute(paginated)
         return result.scalars().all(), total
 
+    async def reload_with_tags(self, image_id: uuid.UUID) -> Image:
+        result = await self._session.execute(
+            select(Image)
+            .where(Image.id == image_id)
+            .options(selectinload(Image.image_tags).selectinload(ImageTag.tag))
+            .execution_options(populate_existing=True)
+        )
+        return result.scalar_one()
+
     async def delete(self, image: Image) -> None:
         await self._session.delete(image)
         await self._session.flush()

api/app/routers/images.py

@@ -167,7 +167,7 @@ async def upload_image(
     if tag_names:
         tag_repo = TagRepository(db)
         await tag_repo.attach_tags(image, tag_names)
-        await db.refresh(image, ["image_tags"])
+        image = await image_repo.reload_with_tags(image.id)
 
     return _image_to_dict(image, duplicate=False)
 
@@ -248,7 +248,7 @@ async def update_image_tags(
         )
 
     await tag_repo.replace_tags_on_image(image, tag_names)
-    await db.refresh(image, ["image_tags"])
+    image = await image_repo.reload_with_tags(image.id)
     return _image_to_dict(image)
 
 

api/pyproject.toml

@@ -1,6 +1,6 @@
 [build-system]
 requires = ["setuptools>=68"]
-build-backend = "setuptools.backends.legacy:build"
+build-backend = "setuptools.build_meta"
 
 [project]
 name = "reactbin-api"
@@ -35,6 +35,8 @@ ignore = []
 
 [tool.pytest.ini_options]
 asyncio_mode = "auto"
+asyncio_default_fixture_loop_scope = "session"
+asyncio_default_test_loop_scope = "session"
 testpaths = ["tests"]
 
 [tool.setuptools.packages.find]

api/tests/integration/conftest.py

@@ -9,7 +9,7 @@ from app.database import Base
 from app.dependencies import get_db, get_storage, get_auth
 
 
-@pytest_asyncio.fixture(scope="session")
+@pytest_asyncio.fixture(scope="session", loop_scope="session")
 async def engine():
     settings = get_settings()
     # Use a separate test database URL if TEST_DATABASE_URL is set

api/tests/integration/test_upload.py

@@ -68,26 +68,24 @@ async def test_upload_invalid_mime_type_returns_422(client):
 
 
 @pytest.mark.asyncio
-async def test_upload_oversized_file_returns_422(client, monkeypatch):
-    import app.config as config_module
-    original_settings = config_module.get_settings()
+async def test_upload_oversized_file_returns_422(client):
+    import os
+    from app.config import get_settings
 
-    class SmallSettings:
-        def __getattr__(self, name):
-            val = getattr(original_settings, name)
-            if name == "max_upload_bytes":
-                return 10
-            return val
+    os.environ["MAX_UPLOAD_BYTES"] = "10"
+    get_settings.cache_clear()
 
-    monkeypatch.setattr(config_module, "get_settings", lambda: SmallSettings())
-
-    response = await client.post(
-        "/api/v1/images",
-        files={"file": ("big.jpg", io.BytesIO(b"x" * 11), "image/jpeg")},
-    )
-    assert response.status_code == 422
-    body = response.json()
-    assert body["code"] == "file_too_large"
+    try:
+        response = await client.post(
+            "/api/v1/images",
+            files={"file": ("big.jpg", io.BytesIO(b"x" * 11), "image/jpeg")},
+        )
+        assert response.status_code == 422
+        body = response.json()
+        assert body["code"] == "file_too_large"
+    finally:
+        del os.environ["MAX_UPLOAD_BYTES"]
+        get_settings.cache_clear()
 
 
 @pytest.mark.asyncio

docker-compose.yml

@@ -66,6 +66,7 @@ services:
       interval: 10s
       timeout: 5s
       retries: 5
+      start_period: 30s
 
   ui:
     build:

ui/Dockerfile

@@ -3,7 +3,7 @@ FROM node:22-slim
 WORKDIR /app
 
 COPY package*.json ./
-RUN npm ci
+RUN npm install
 
 COPY . .