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Build an internal EU VAT and OSS (One Stop Shop) sales tax aggregation backend service using Node.js, Express, and PostgreSQL.

1. DATA MODEL:
- Create an `orders` table storing order_id, store_id, customer_country, is_b2b, vat_number, total_gross, total_net, vat_amount, tax_rate, currency, ecb_exchange_rate, timestamp.
- Create a `vat_rates` table caching EU country codes, standard rate, reduced rates, and last_updated timestamp.
- Create an `audit_logs` table storing raw VIES SOAP response XML for B2B transactions.

2. CORE FUNCTIONALITY:
- Endpoint POST /api/tax/calculate: Accepts customer country code, order items, and optional VAT ID. If VAT ID is provided and passes VIES validation, set rate to 0% (reverse charge) and mark B2B true. Otherwise, resolve destination EU standard/reduced VAT rate from `vat_rates` table.
- Webhook POST /api/webhooks/order-created: Consumes store orders. Fetches daily ECB exchange rate for non-EUR sales on the transaction date, calculates net/tax amounts in local currency and EUR, and writes to `orders` table.
- Endpoint GET /api/reports/oss: Accepts year and quarter parameters. Queries orders within date range, groups sales by customer EU country, sums total net revenue and total VAT collected in EUR, and exports a formatted CSV matching standard EU Union OSS declaration reporting columns.

3. FAILURE MODES & EDGE CASES:
- If VIES API times out or fails, fall back to regex format checks, flag order for manual review, and apply destination consumer VAT by default.
- Convert all foreign currency amounts to EUR using official European Central Bank reference rates for the transaction date.
- Enforce correct handling of zero-rated items (e.g., books, digital goods exceptions).

4. OUT OF SCOPE:
- Direct submission of XML/SAF-T files to national tax authority web portals.
- Legal fiscal representation or registration filings.
- Storefront frontend UI (API endpoints only).

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