feat: T03 backend core – FastAPI + DB models + Equipment API + Redis cache + health + tests

- FastAPI app with CORS, lifespan handlers
- Pydantic Settings config (DB, Redis, CORS, SMTP, JWT, Rentman)
- SQLAlchemy async engine + session (DeclarativeBase)
- 6 DB models: EquipmentCache, RentalRequest, RentalRequestItem, Contact, AdminUser, SyncLog
- Pydantic schemas: EquipmentItem, EquipmentDetail, PaginatedEquipment, ContactCreate, ContactResponse
- Redis cache helper: set/get/delete_pattern, rate limiting, equipment key builders
- Equipment router: list (search/category/sort/pagination), detail, categories – all cached
- Contact router: POST with Pydantic validation + rate limiting (5/min)
- Health router: GET /api/health with DB + Redis status
- 28 pytest tests (all pass, 90% coverage)
- Dockerfile, requirements.txt, pytest.ini, test_report.md

backend/app/models/rental_request.py

@@ -0,0 +1,62 @@
+"""RentalRequest and RentalRequestItem SQLAlchemy models."""
+
+from datetime import date, datetime
+
+from sqlalchemy import Date, ForeignKey, Index, Integer, Numeric, String, Text, func
+from sqlalchemy.orm import Mapped, mapped_column, relationship
+
+from app.database import Base
+
+
+class RentalRequest(Base):
+    """Rental request submitted by a customer."""
+
+    __tablename__ = "rental_requests"
+
+    id: Mapped[int] = mapped_column(Integer, primary_key=True, autoincrement=True)
+    reference_number: Mapped[str] = mapped_column(String(32), unique=True, nullable=False)
+    event_name: Mapped[str] = mapped_column(String(255), nullable=False)
+    date_start: Mapped[date] = mapped_column(Date, nullable=False)
+    date_end: Mapped[date] = mapped_column(Date, nullable=False)
+    location: Mapped[str | None] = mapped_column(String(255), nullable=True)
+    person_count: Mapped[int | None] = mapped_column(Integer, nullable=True)
+    contact_name: Mapped[str] = mapped_column(String(255), nullable=False)
+    contact_company: Mapped[str | None] = mapped_column(String(255), nullable=True)
+    contact_email: Mapped[str] = mapped_column(String(255), nullable=False)
+    contact_phone: Mapped[str | None] = mapped_column(String(64), nullable=True)
+    contact_street: Mapped[str | None] = mapped_column(String(255), nullable=True)
+    contact_postalcode: Mapped[str | None] = mapped_column(String(16), nullable=True)
+    contact_city: Mapped[str | None] = mapped_column(String(128), nullable=True)
+    message: Mapped[str | None] = mapped_column(Text, nullable=True)
+    status: Mapped[str] = mapped_column(String(32), default="pending", nullable=False)
+    rentman_request_id: Mapped[str | None] = mapped_column(String(64), nullable=True)
+    rentman_sync_status: Mapped[str] = mapped_column(String(32), default="pending", nullable=False)
+    rentman_sync_error: Mapped[str | None] = mapped_column(Text, nullable=True)
+    created_at: Mapped[datetime] = mapped_column(server_default=func.now(), nullable=False)
+
+    items: Mapped[list["RentalRequestItem"]] = relationship(back_populates="rental_request", cascade="all, delete-orphan")
+
+    __table_args__ = (
+        Index("idx_rental_status", "status"),
+    )
+
+
+class RentalRequestItem(Base):
+    """Individual equipment line item in a rental request."""
+
+    __tablename__ = "rental_request_items"
+
+    id: Mapped[int] = mapped_column(Integer, primary_key=True, autoincrement=True)
+    rental_request_id: Mapped[int] = mapped_column(ForeignKey("rental_requests.id", ondelete="CASCADE"), nullable=False)
+    equipment_id: Mapped[int | None] = mapped_column(ForeignKey("equipment_cache.id"), nullable=True)
+    equipment_name: Mapped[str | None] = mapped_column(String(255), nullable=True)
+    rentman_equipment_id: Mapped[str | None] = mapped_column(String(64), nullable=True)
+    quantity: Mapped[int] = mapped_column(Integer, nullable=False, default=1)
+    unit_price: Mapped[float | None] = mapped_column(Numeric(10, 2), nullable=True)
+    rentman_sync_status: Mapped[str] = mapped_column(String(32), default="pending", nullable=False)
+
+    rental_request: Mapped["RentalRequest"] = relationship(back_populates="items")
+
+    __table_args__ = (
+        Index("idx_rental_items_request", "rental_request_id"),
+    )