Add initial MVP documentation for DMARQ platform, detailing backend architecture, frontend implementation, and deployment structure

backend/app/core/database.py

@@ -0,0 +1,27 @@
+from typing import Generator
+
+from sqlalchemy import create_engine
+from sqlalchemy.ext.declarative import declarative_base
+from sqlalchemy.orm import sessionmaker
+
+from app.core.config import get_settings
+
+settings = get_settings()
+
+# Configure SQLAlchemy
+engine = create_engine(settings.DATABASE_URL, pool_pre_ping=True)
+SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
+
+# Create base class for SQLAlchemy models
+Base = declarative_base()
+
+
+def get_db() -> Generator:
+    """
+    Dependency for getting DB sessions
+    """
+    db = SessionLocal()
+    try:
+        yield db
+    finally:
+        db.close()