Initial public release

Aurum — a self-hosted personal finance operating system: cash flow,
net worth tracking, budgets, goals, recurring payments, reports,
proactive alerts, and a compound-interest returns calculator, all
bilingual (RU/EN) and mobile-first. Ships as a three-container Docker
Compose stack (Postgres + FastAPI + nginx-served React frontend).

See README.md for setup and CONTRIBUTING.md for development.

backend/app/models/category.py

@@ -0,0 +1,26 @@
+"""A spending/income category, colored so it maps 1:1 to a dashboard chart slot."""
+from sqlalchemy import Boolean, Enum, Integer, String
+from sqlalchemy.orm import Mapped, mapped_column, relationship
+
+from app.db.base import Base
+from app.models.enums import CategoryKind
+
+
+class Category(Base):
+    __tablename__ = "categories"
+
+    id: Mapped[int] = mapped_column(primary_key=True)
+    name: Mapped[str] = mapped_column(String(100), nullable=False)
+    kind: Mapped[CategoryKind] = mapped_column(
+        Enum(CategoryKind, name="category_kind", native_enum=False, length=10), nullable=False
+    )
+    # Lucide icon name rendered in the frontend (kept as a plain string so new
+    # icons don't require a migration).
+    icon: Mapped[str | None] = mapped_column(String(50), nullable=True)
+    # Hex color drawn from the dataviz skill's validated categorical palette.
+    color: Mapped[str] = mapped_column(String(7), nullable=False)
+    # Fixed slot ordering keeps the donut chart's category order stable across renders.
+    sort_order: Mapped[int] = mapped_column(Integer, nullable=False, default=0)
+    is_default: Mapped[bool] = mapped_column(Boolean, nullable=False, default=False)
+
+    transactions: Mapped[list["Transaction"]] = relationship(back_populates="category")