first commit of restructured project

trahn-trade-backend/env.example

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+# Trahn Grid Trader - Environment Variables
+# 
+# This file contains ONLY secrets and sensitive data.
+# All other configuration is in the appropriate service/config files.
+#
+# Copy this file to .env and fill in your values.
+
+# ============================================
+# DATABASE CREDENTIALS - REQUIRED
+# ============================================
+
+# PostgreSQL connection details
+DB_HOST=localhost
+DB_PORT=5432
+DB_NAME=trahn_grid_trader
+DB_USER=postgres
+DB_PASSWORD=your_secure_password_here
+
+# ============================================
+# BLOCKCHAIN SECRETS - REQUIRED
+# ============================================
+
+# Your Ethereum wallet address
+WALLET_ADDRESS=0x...
+
+# Your wallet private key (with 0x prefix) - KEEP THIS SECRET!
+# Only required for LIVE trading (not needed for paper trading)
+PRIVATE_KEY=0x...
+
+# Ethereum RPC endpoint (Infura, Alchemy, etc.)
+ETHEREUM_API_ENDPOINT=https://mainnet.infura.io/v3/YOUR_PROJECT_ID
+
+# ============================================
+# API KEYS - OPTIONAL
+# ============================================
+
+# Dune Analytics API key (get one at https://dune.com/settings/api)
+# Optional: Leave empty to use fallback mode (current price as midpoint)
+DUNE_API_KEY=
+
+# ============================================
+# OPTIONAL - API SECURITY
+# ============================================
+
+# Bearer token for REST API authentication.
+# All /v1/* endpoints require "Authorization: Bearer <key>" when set.
+# Leave empty to allow unauthenticated access (development only).
+API_KEY=
+
+# CORS allowed origin. Default "*" (any origin).
+# Set to your frontend URL in production (e.g., https://trahn.example.com)
+CORS_ALLOW_ORIGIN=*
+
+# ============================================
+# OPTIONAL - NOTIFICATIONS
+# ============================================
+
+# Webhook URL for notifications (Slack, Discord, etc.)
+# Leave empty to disable notifications
+WEBHOOK_URL=
+