Database Connection Pool Exhaustion

1. Connections not being closed after use
2. Long-running transactions holding connections
3. Creating new client per request instead of reusing
4. Async operations not awaiting properly
5. Connection pool size too small for load

Reuse Supabase client instance:

// Good - single instance
const supabase = createClient(URL, KEY);
export default supabase;

// Bad - creates new client each request
const client = new createClient(URL, KEY);

Keep transactions short. Use connection pooling mode in Supabase Settings.