Initial project structure: MarketScanner - Fear-to-Fortune Trading Intelligence

Features:
- FastAPI backend with stocks, news, signals, watchlist, analytics endpoints
- React frontend with TailwindCSS dark mode trading dashboard
- Celery workers for news fetching, sentiment analysis, pattern detection
- TimescaleDB schema for time-series stock data
- Docker Compose setup for all services
- OpenAI integration for sentiment analysis

backend/app/core/database.py

@@ -0,0 +1,79 @@
+"""
+Database Configuration and Session Management
+"""
+
+from sqlalchemy.ext.asyncio import AsyncSession, create_async_engine, async_sessionmaker
+from sqlalchemy.orm import declarative_base
+from sqlalchemy import create_engine
+from sqlalchemy.orm import sessionmaker
+
+from app.core.config import settings
+
+# Async engine for FastAPI
+async_engine = create_async_engine(
+    settings.DATABASE_URL,
+    echo=settings.DEBUG,
+    pool_pre_ping=True,
+    pool_size=10,
+    max_overflow=20,
+)
+
+# Async session factory
+AsyncSessionLocal = async_sessionmaker(
+    async_engine,
+    class_=AsyncSession,
+    expire_on_commit=False,
+    autocommit=False,
+    autoflush=False,
+)
+
+# Sync engine for Celery workers
+sync_engine = create_engine(
+    settings.DATABASE_URL_SYNC,
+    echo=settings.DEBUG,
+    pool_pre_ping=True,
+    pool_size=5,
+    max_overflow=10,
+)
+
+# Sync session factory
+SyncSessionLocal = sessionmaker(
+    sync_engine,
+    autocommit=False,
+    autoflush=False,
+)
+
+# Base class for models
+Base = declarative_base()
+
+
+async def init_db():
+    """Initialize database (create tables if needed)."""
+    # Tables are created by init.sql, but we can add migrations here
+    pass
+
+
+async def get_db() -> AsyncSession:
+    """Dependency for getting async database session."""
+    async with AsyncSessionLocal() as session:
+        try:
+            yield session
+            await session.commit()
+        except Exception:
+            await session.rollback()
+            raise
+        finally:
+            await session.close()
+
+
+def get_sync_db():
+    """Get sync database session for Celery workers."""
+    db = SyncSessionLocal()
+    try:
+        yield db
+        db.commit()
+    except Exception:
+        db.rollback()
+        raise
+    finally:
+        db.close()