Fix analytics case() bug, add privacy mode, add prod DB sync script

Fix SQLAlchemy case() import in monthly-trend endpoint. Add
data-sensitive attributes to Analytics charts and tables for privacy
blur. Add scripts/sync-db.sh for one-click prod-to-local PostgreSQL
sync. Remove SQLite artifacts from gitignore.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

backend/app/api/v1/endpoints/analytics.py

@@ -3,12 +3,13 @@ from typing import Optional
 
 from fastapi import APIRouter, Depends
 from pydantic import BaseModel
+from sqlalchemy import case
 from sqlmodel import Session, func, select
 
 from app.auth import get_current_user
 from app.db import get_session
 from app.models.models import Category, Transaction
-from app.api.v1.endpoints.transactions import get_cycle_range
+from app.services.budget_projection import get_cycle_range
 
 router = APIRouter(prefix="/analytics", tags=["analytics"])
 
@@ -104,7 +105,7 @@ def monthly_trend(
                 func.count(),
                 func.coalesce(
                     func.sum(
-                        func.case(
+                        case(
                             (Transaction.currency == "CRC", Transaction.amount),
                             else_=0,
                         )
@@ -113,7 +114,7 @@ def monthly_trend(
                 ),
                 func.coalesce(
                     func.sum(
-                        func.case(
+                        case(
                             (Transaction.currency == "USD", Transaction.amount),
                             else_=0,
                         )