trahn-trade/trahn-trade-backend/db

Database Setup

Quick Start

1. Install And Run PostgreSQL

macOS:

brew install postgresql@15
brew services start postgresql@15

Ubuntu/Debian:

sudo apt update
sudo apt install postgresql postgresql-contrib
sudo systemctl start postgresql

Docker:

docker run --name trahn-postgres \
  -e POSTGRES_PASSWORD=your_password \
  -p 5432:5432 \
  -d postgres:15

2. Create Database and Schema

# Connect as postgres user
psql -U postgres

# Create database
CREATE DATABASE trahn_grid_trader;

# Exit psql
\q

# Run schema
psql -U postgres -d trahn_grid_trader -f db/schema.sql

3. Configure .env

Add to your .env file:

DB_HOST=localhost
DB_PORT=5432
DB_NAME=trahn_grid_trader
DB_USER=postgres
DB_PASSWORD=your_secure_password_here

4. Test Connection

make dev
# Verify "[DB] Connection successful" appears in the output

Schema Overview

Tables

1. price_history - ETH price data points

   • Timestamp-indexed for fast queries
   • Organized by trading day (12:00 EST boundary)

2. trade_history - Executed trades

   • Buy/sell records with full details
   • Paper trade flag for simulation tracking

3. support_resistance_history - S/R levels over time

   • Historical record of Dune API fetches
   • Tracks when grid was recalculated

4. grid_state - Current grid configuration

   • Grid levels stored as JSONB
   • State tracking for bot restarts

Indexes

• All tables indexed on timestamp for time-series queries
• trading_day indexed for day-based queries
• Optimized for append-heavy workloads

Maintenance

View Data

-- Recent prices
SELECT * FROM price_history ORDER BY timestamp DESC LIMIT 10;

-- Recent trades
SELECT * FROM trade_history ORDER BY timestamp DESC LIMIT 10;

-- S/R history
SELECT * FROM support_resistance_history ORDER BY timestamp DESC LIMIT 10;

-- Latest S/R (using view)
SELECT * FROM latest_support_resistance;

Cleanup Old Data (optional)

-- Delete price data older than 90 days
DELETE FROM price_history WHERE timestamp < NOW() - INTERVAL '90 days';

-- Keep all trade history (don't delete)

Troubleshooting

Connection Failed

• Check PostgreSQL is running: pg_isready
• Verify credentials in .env
• Check firewall/network settings

Schema Errors

• Drop and recreate: DROP DATABASE trahn_grid_trader; CREATE DATABASE trahn_grid_trader;
• Re-run schema.sql

Performance

• If queries slow, add more indexes
• Consider partitioning price_history by month (for large datasets)