WIP checkpoint: Scaffold FastAPI backend project structure

backend/app/config.py

@@ -33,7 +33,6 @@ class Settings(BaseSettings):
         env_file=".env",
         env_file_encoding="utf-8",
         case_sensitive=True,
-        extra="ignore",
     )
 
     @property

backend/app/main.py

@@ -3,6 +3,7 @@
 from contextlib import asynccontextmanager
 
 from fastapi import FastAPI
+from fastapi.middleware.cors import CORSMiddleware
 
 from app.config import settings
 from app.routers import auth, users, worlds, assets
@@ -17,12 +18,21 @@ async def lifespan(app: FastAPI):
 
 
 app = FastAPI(
-    title=settings.app_name,
-    version=settings.app_version,
+    title=settings.APP_NAME,
+    version=settings.APP_VERSION,
     description="Agentic Game Platform - Backend API",
     lifespan=lifespan,
 )
 
+# CORS
+app.add_middleware(
+    CORSMiddleware,
+    allow_origins=settings.cors_origins_list,
+    allow_credentials=True,
+    allow_methods=["*"],
+    allow_headers=["*"],
+)
+
 # Include routers
 app.include_router(auth.router, prefix="/api/auth", tags=["auth"])
 app.include_router(users.router, prefix="/api/users", tags=["users"])
@@ -33,4 +43,4 @@ app.include_router(assets.router, prefix="/api/assets", tags=["assets"])
 @app.get("/api/health")
 async def health_check():
     """Simple health check endpoint."""
-    return {"status": "ok", "app": settings.app_name}
+    return {"status": "ok", "app": settings.APP_NAME}

backend/app/models/session.py

@@ -1,4 +1,6 @@
-from sqlalchemy import Column, Integer, String, DateTime, ForeignKey, Boolean
+import uuid
+
+from sqlalchemy import Column, String, DateTime, ForeignKey, Boolean
 from sqlalchemy.orm import relationship
 from sqlalchemy.sql import func
 from app.database import Base
@@ -7,7 +9,7 @@ from app.database import Base
 class Session(Base):
     __tablename__ = "sessions"
 
-    id = Column(String, primary_key=True)
+    id = Column(String(36), primary_key=True, default=lambda: str(uuid.uuid4()))
     user_id = Column(Integer, ForeignKey("users.id", ondelete="CASCADE"), nullable=False)
     token = Column(String, unique=True, index=True, nullable=False)
     expires_at = Column(DateTime(timezone=True), nullable=False)

backend/app/models/world.py

@@ -1,4 +1,5 @@
-from sqlalchemy import Column, Integer, String, Text, DateTime, ForeignKey, Enum
+from sqlalchemy import Column, Integer, String, Text, DateTime, ForeignKey
+from sqlalchemy.dialects.postgresql import ENUM
 from sqlalchemy.orm import relationship
 from sqlalchemy.sql import func
 import enum
@@ -19,7 +20,10 @@ class World(Base):
     name = Column(String(255), nullable=False)
     description = Column(Text, nullable=True)
     owner_id = Column(Integer, ForeignKey("users.id"), nullable=False)
-    visibility = Column(Enum(WorldVisibility), default=WorldVisibility.PUBLIC)
+    visibility = Column(
+        ENUM(WorldVisibility, name="world_visibility", create_type=False),
+        default=WorldVisibility.PUBLIC,
+    )
     created_at = Column(DateTime(timezone=True), server_default=func.now())
     updated_at = Column(DateTime(timezone=True), onupdate=func.now())