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>

postgres/init/02_rls_policies.sql

@@ -0,0 +1,14 @@
+-- Row Level Security policies
+-- The application sets: SET LOCAL app.current_user_id = '<uuid>' at the start of each request
+
+-- Helper function to get current user id safely
+CREATE OR REPLACE FUNCTION current_app_user_id() RETURNS UUID AS $$
+BEGIN
+    RETURN current_setting('app.current_user_id', true)::UUID;
+EXCEPTION WHEN OTHERS THEN
+    RETURN NULL;
+END;
+$$ LANGUAGE plpgsql STABLE SECURITY DEFINER;
+
+-- Policies are applied after table creation via Alembic migration
+-- This file sets up the helper only; RLS is enabled in the migration