Build a small reliability-critical relay service between **TradingView webhook → SignalStack execution**. The service must: 1. Receive webhook JSON 2. Forward it unchanged to SignalStack 3. Log each event into an auto-growing CSV dataset (Excel-ready) 4. Prevent duplicate processing 5. Run continuously and safely (24/7 trading environment) This is infrastructure plumbing — not a trading bot, UI, or analytics system. Example Input ```json {"symbol":"CADH2026","quantity":1,"action":"buy","strategy_code":40217,"position_id":"40217_17022026_0600","bucket":"IW_LONG"} ``` Extra fields may appear and must not break forwarding. --- Requirements -Webhook Endpoint * POST `/webhook` * Validate JSON * Shared secret authentication * Proper HTTP responses Forwarding * Forward payload unchanged to configurable SignalStack URL * Timeout handling * Do not crash if downstream unavailable Logging Append each event to CSV (Excel-safe escaping): Required fields: * timestamp_received (UTC) * symbol * quantity * action * strategy_code * position_id * bucket * raw_json * forward_status SQLite optional but welcome. dempotency (critical) Duplicate webhook deliveries must not be forwarded or logged twice (hash or ID-based dedup acceptable) Configuration Via `.env`: SIGNALSTACK_URL, API_KEY, PORT, FILE_PATH, TIMEOUT Deployment Docker preferred or simple Windows service Include setup instructions --- Out of Scope No UI, no analytics, no broker integration, no dashboards. --- Deliverables Code + run instructions + example config. --- Required Proposal Answers (automatic filtering) 1. How will you implement idempotency? 2. How do you prevent CSV corruption with concurrent requests? 3. What happens if the downstream webhook times out? --- Candidate Level Backend engineer with webhook / ingestion reliability experience. Not suitable for beginners. ---