Initial kitchen scaffold — Phase 1 kitchen port (build-verified 2026-07-11)

FastAPI backend (Python 3.11, MSSQL ODBC for SambaPOS, Azure DI OCR),
kitchen_db on central PG. React/TS/Vite frontend with navy sidebar layout.

Backend: auth.py (APP_SLUG=kitchen, SimpleNamespace — archive routes use
.kitchen_id/.is_admin without modification), main.py (51 migrations, scheduler,
internal router for KDS bookings feed), api/internal.py, full archive API
(31 routers: invoices, recipes, menus, sambapos, resos, newbook, disputes,
purchase_orders, etc.), models, migrations, OCR pipeline.
kitchen_id pinned to 1 (B1 — single hotel).

Frontend: AuthGate (app=kitchen, token shim for archive compat — B5b pending),
Layout (navy sidebar, 6 sections, Lucide icons, teal --app-primary),
App.tsx (Outlet pattern, UploadApp outside Layout), index.css (full :root block).
strict: false — archive components have type issues; build clean.

Note: 45 archive components call fetch('/api/...') without /kitchen/ prefix
(B5b). Runtime 404s; deferred until after initial testing.

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

backend/models/acknowledged_price.py

@@ -0,0 +1,50 @@
+"""
+AcknowledgedPrice model for tracking user-acknowledged price changes.
+
+When a price change is detected and flagged, users can acknowledge it
+to prevent it from being repeatedly flagged.
+"""
+from datetime import datetime
+from decimal import Decimal
+from sqlalchemy import ForeignKey, String, Text, Numeric, DateTime, UniqueConstraint
+from sqlalchemy.orm import Mapped, mapped_column, relationship
+from database import Base
+
+
+class AcknowledgedPrice(Base):
+    """Tracks acknowledged price changes for line items."""
+    __tablename__ = "acknowledged_prices"
+
+    id: Mapped[int] = mapped_column(primary_key=True)
+    kitchen_id: Mapped[int] = mapped_column(ForeignKey("kitchens.id"))
+    supplier_id: Mapped[int] = mapped_column(ForeignKey("suppliers.id"))
+
+    # Product identification (same logic as line item consolidation)
+    product_code: Mapped[str | None] = mapped_column(String(100), nullable=True)
+    description: Mapped[str | None] = mapped_column(Text, nullable=True)
+
+    # The acknowledged price point
+    acknowledged_price: Mapped[Decimal] = mapped_column(Numeric(10, 2))
+    acknowledged_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.utcnow)
+    acknowledged_by_user_id: Mapped[int] = mapped_column(ForeignKey("users.id"))
+
+    # Which invoice triggered this acknowledgement
+    source_invoice_id: Mapped[int | None] = mapped_column(ForeignKey("invoices.id"), nullable=True)
+    source_line_item_id: Mapped[int | None] = mapped_column(ForeignKey("line_items.id"), nullable=True)
+
+    # Relationships
+    kitchen = relationship("Kitchen", backref="acknowledged_prices")
+    supplier = relationship("Supplier", backref="acknowledged_prices")
+    acknowledged_by_user = relationship("User", backref="acknowledged_prices")
+    source_invoice = relationship("Invoice", backref="acknowledged_prices")
+
+    # Unique constraint: one acknowledged price per product per supplier per kitchen
+    __table_args__ = (
+        UniqueConstraint(
+            'kitchen_id', 'supplier_id', 'product_code', 'description',
+            name='uix_acknowledged_price'
+        ),
+    )
+
+    def __repr__(self):
+        return f"<AcknowledgedPrice {self.id}: {self.product_code or self.description} @ {self.acknowledged_price}>"