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/api/v1/budgets.py

@@ -0,0 +1,79 @@
+import uuid
+
+from fastapi import APIRouter, Depends, HTTPException, status
+from sqlalchemy.ext.asyncio import AsyncSession
+
+from app.dependencies import get_current_user, get_db
+from app.db.models.user import User
+from app.schemas.budget import BudgetCreate, BudgetResponse, BudgetSummaryItem, BudgetUpdate
+from app.services import budget_service
+
+router = APIRouter(prefix="/budgets", tags=["budgets"])
+
+
+@router.get("", response_model=list[BudgetResponse])
+async def list_budgets(
+    active_only: bool = True,
+    db: AsyncSession = Depends(get_db),
+    current_user: User = Depends(get_current_user),
+):
+    return await budget_service.list_budgets(db, current_user.id, active_only)
+
+
+@router.post("", response_model=BudgetResponse, status_code=status.HTTP_201_CREATED)
+async def create_budget(
+    data: BudgetCreate,
+    db: AsyncSession = Depends(get_db),
+    current_user: User = Depends(get_current_user),
+):
+    budget = await budget_service.create_budget(db, current_user.id, data)
+    await db.commit()
+    return budget
+
+
+@router.get("/summary", response_model=list[BudgetSummaryItem])
+async def get_budget_summary(
+    db: AsyncSession = Depends(get_db),
+    current_user: User = Depends(get_current_user),
+):
+    return await budget_service.get_budget_summary(db, current_user.id)
+
+
+@router.get("/{budget_id}", response_model=BudgetResponse)
+async def get_budget(
+    budget_id: uuid.UUID,
+    db: AsyncSession = Depends(get_db),
+    current_user: User = Depends(get_current_user),
+):
+    budget = await budget_service.get_budget(db, current_user.id, budget_id)
+    if not budget:
+        raise HTTPException(status_code=404, detail="Budget not found")
+    return budget
+
+
+@router.put("/{budget_id}", response_model=BudgetResponse)
+async def update_budget(
+    budget_id: uuid.UUID,
+    data: BudgetUpdate,
+    db: AsyncSession = Depends(get_db),
+    current_user: User = Depends(get_current_user),
+):
+    budget = await budget_service.get_budget(db, current_user.id, budget_id)
+    if not budget:
+        raise HTTPException(status_code=404, detail="Budget not found")
+    budget = await budget_service.update_budget(db, budget, data)
+    await db.commit()
+    return budget
+
+
+@router.delete("/{budget_id}", status_code=status.HTTP_204_NO_CONTENT)
+async def delete_budget(
+    budget_id: uuid.UUID,
+    db: AsyncSession = Depends(get_db),
+    current_user: User = Depends(get_current_user),
+):
+    budget = await budget_service.get_budget(db, current_user.id, budget_id)
+    if not budget:
+        raise HTTPException(status_code=404, detail="Budget not found")
+    await budget_service.delete_budget(db, budget)
+    await db.commit()