Backend overhaul: new models, routers, schemas for shifts, business day, flags, messages, settings

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

local_backend/models/settings.py

@@ -0,0 +1,19 @@
+from sqlalchemy import Column, Integer, String, DateTime, ForeignKey
+from sqlalchemy.orm import relationship
+from datetime import datetime, timezone
+from database import Base
+
+
+def _utcnow():
+    return datetime.now(timezone.utc)
+
+
+class PosSettings(Base):
+    __tablename__ = "pos_settings"
+
+    key = Column(String, primary_key=True)
+    value = Column(String, nullable=False)
+    updated_at = Column(DateTime(timezone=True), default=_utcnow, onupdate=_utcnow, nullable=False)
+    updated_by_id = Column(Integer, ForeignKey("users.id"), nullable=True)
+
+    updated_by = relationship("User", foreign_keys=[updated_by_id])