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/transaction.py

@@ -0,0 +1,42 @@
+import uuid
+from datetime import date, datetime
+from decimal import Decimal
+
+from sqlalchemy import Boolean, Date, DateTime, ForeignKey, LargeBinary, Numeric, String, Text
+from sqlalchemy.dialects.postgresql import ARRAY, JSONB, UUID
+from sqlalchemy.orm import Mapped, mapped_column, relationship
+
+from app.db.base import Base
+
+
+class Transaction(Base):
+    __tablename__ = "transactions"
+
+    id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
+    user_id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), ForeignKey("users.id", ondelete="CASCADE"), nullable=False, index=True)
+    account_id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), ForeignKey("accounts.id"), nullable=False, index=True)
+    transfer_account_id: Mapped[uuid.UUID | None] = mapped_column(UUID(as_uuid=True), ForeignKey("accounts.id"), nullable=True)
+    category_id: Mapped[uuid.UUID | None] = mapped_column(UUID(as_uuid=True), ForeignKey("categories.id"), nullable=True, index=True)
+    type: Mapped[str] = mapped_column(String(20), nullable=False)    # income|expense|transfer|investment
+    status: Mapped[str] = mapped_column(String(20), default="cleared", nullable=False)
+    amount: Mapped[Decimal] = mapped_column(Numeric(20, 8), nullable=False)
+    amount_base: Mapped[Decimal | None] = mapped_column(Numeric(20, 8), nullable=True)
+    currency: Mapped[str] = mapped_column(String(10), nullable=False)
+    base_currency: Mapped[str] = mapped_column(String(10), nullable=False)
+    exchange_rate: Mapped[Decimal | None] = mapped_column(Numeric(20, 10), nullable=True)
+    date: Mapped[date] = mapped_column(Date, nullable=False, index=True)
+    description_enc: Mapped[bytes] = mapped_column("description", LargeBinary, nullable=False)
+    merchant_enc: Mapped[bytes | None] = mapped_column("merchant", LargeBinary, nullable=True)
+    notes_enc: Mapped[bytes | None] = mapped_column("notes", LargeBinary, nullable=True)
+    tags: Mapped[list[str]] = mapped_column(ARRAY(Text), default=list, nullable=False)
+    is_recurring: Mapped[bool] = mapped_column(Boolean, default=False, nullable=False)
+    recurring_rule: Mapped[dict | None] = mapped_column(JSONB, nullable=True)
+    attachment_refs: Mapped[list] = mapped_column(JSONB, default=list, nullable=False)
+    import_hash: Mapped[str | None] = mapped_column(Text, nullable=True, index=True)
+    meta: Mapped[dict] = mapped_column(JSONB, default=dict, nullable=False)
+    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), nullable=False)
+    updated_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), nullable=False)
+    deleted_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)
+
+    account: Mapped["Account"] = relationship(foreign_keys=[account_id], back_populates="transactions", lazy="noload")  # type: ignore[name-defined]
+    category: Mapped["Category | None"] = relationship(lazy="noload")  # type: ignore[name-defined]