Initial commit: MyMidas personal finance tracker

Full-stack self-hosted finance app with FastAPI backend and React frontend.

Features:
- Accounts, transactions, budgets, investments with GBP base currency
- CSV import with auto-detection for 10 UK bank formats
- ML predictions: spending forecast, net worth projection, Monte Carlo
- 7 selectable themes (Obsidian, Arctic, Midnight, Vault, Terminal, Synthwave, Ledger)
- Receipt/document attachments on transactions (JPEG, PNG, WebP, PDF)
- AES-256-GCM field encryption, RS256 JWT, TOTP 2FA, RLS, audit log
- Encrypted nightly backups + key rotation script
- Mobile-responsive layout with bottom nav

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

backend/app/db/models/asset.py

@@ -0,0 +1,32 @@
+import uuid
+from datetime import datetime
+from decimal import Decimal
+
+from sqlalchemy import Boolean, DateTime, Numeric, String, Text
+from sqlalchemy.dialects.postgresql import UUID
+from sqlalchemy.orm import Mapped, mapped_column, relationship
+
+from app.db.base import Base
+
+
+class Asset(Base):
+    __tablename__ = "assets"
+
+    id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
+    symbol: Mapped[str] = mapped_column(Text, nullable=False, index=True)
+    name: Mapped[str] = mapped_column(Text, nullable=False)
+    type: Mapped[str] = mapped_column(String(30), nullable=False)  # stock|etf|mutual_fund|bond|crypto|commodity|other
+    currency: Mapped[str] = mapped_column(String(10), nullable=False)
+    exchange: Mapped[str | None] = mapped_column(Text, nullable=True)
+    isin: Mapped[str | None] = mapped_column(String(12), nullable=True)
+    data_source: Mapped[str] = mapped_column(String(30), default="yahoo_finance", nullable=False)
+    data_source_id: Mapped[str | None] = mapped_column(Text, nullable=True)
+    last_price: Mapped[Decimal | None] = mapped_column(Numeric(20, 8), nullable=True)
+    last_price_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)
+    price_change_24h: Mapped[Decimal | None] = mapped_column(Numeric(10, 4), nullable=True)
+    is_active: Mapped[bool] = mapped_column(Boolean, default=True, nullable=False)
+    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), nullable=False)
+    updated_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), nullable=False)
+
+    prices: Mapped[list["AssetPrice"]] = relationship(back_populates="asset", lazy="noload")  # type: ignore[name-defined]
+    holdings: Mapped[list["InvestmentHolding"]] = relationship(back_populates="asset", lazy="noload")  # type: ignore[name-defined]