#!/bin/bash
# PostgreSQL Production Tuning for Horux360
# Server: 32GB RAM, 8 cores
# Target: 50 tenants, PM2 cluster ×2
#
# Run once: sudo bash scripts/tune-postgres.sh

set -euo pipefail

echo "=== PostgreSQL Production Tuning ==="

sudo -u postgres psql -c "ALTER SYSTEM SET max_connections = 300;"
sudo -u postgres psql -c "ALTER SYSTEM SET shared_buffers = '4GB';"
sudo -u postgres psql -c "ALTER SYSTEM SET work_mem = '16MB';"
sudo -u postgres psql -c "ALTER SYSTEM SET effective_cache_size = '16GB';"
sudo -u postgres psql -c "ALTER SYSTEM SET maintenance_work_mem = '512MB';"
sudo -u postgres psql -c "ALTER SYSTEM SET checkpoint_completion_target = 0.9;"
sudo -u postgres psql -c "ALTER SYSTEM SET wal_buffers = '64MB';"
sudo -u postgres psql -c "ALTER SYSTEM SET random_page_cost = 1.1;"

echo "Settings applied. Restarting PostgreSQL..."
sudo systemctl restart postgresql

echo "Verifying settings..."
sudo -u postgres psql -c "SHOW max_connections; SHOW shared_buffers; SHOW work_mem;"

echo "=== Done ==="