Added screenshots

backend/app/core/database.py

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+from sqlalchemy.ext.asyncio import AsyncSession, create_async_engine, async_sessionmaker
+from sqlalchemy.orm import DeclarativeBase
+
+from backend.app.core.config import settings
+
+
+engine = create_async_engine(
+    settings.database_url,
+    echo=settings.debug,
+)
+
+async_session = async_sessionmaker(
+    engine,
+    class_=AsyncSession,
+    expire_on_commit=False,
+)
+
+
+class Base(DeclarativeBase):
+    pass
+
+
+async def get_db() -> AsyncSession:
+    async with async_session() as session:
+        try:
+            yield session
+            await session.commit()
+        except Exception:
+            await session.rollback()
+            raise
+        finally:
+            await session.close()
+
+
+async def init_db():
+    # Import models to register them with SQLAlchemy
+    from backend.app.models import printer, archive, filament, settings  # noqa: F401
+
+    async with engine.begin() as conn:
+        await conn.run_sync(Base.metadata.create_all)
+
+        # Run migrations for new columns (SQLite doesn't auto-add columns)
+        await run_migrations(conn)
+
+
+async def run_migrations(conn):
+    """Add new columns to existing tables if they don't exist."""
+    from sqlalchemy import text
+
+    # Migration: Add is_favorite column to print_archives
+    try:
+        await conn.execute(text(
+            "ALTER TABLE print_archives ADD COLUMN is_favorite BOOLEAN DEFAULT 0"
+        ))
+    except Exception:
+        # Column already exists
+        pass