n8n in-memory key-value store – store and retrieve data across nodes without a database March 28, 2026 n8n Performance & Scaling
n8n database connection timed out – PostgreSQL pool exhausted fix March 28, 2026 n8n Queue Mode Errors
n8n queue mode Docker Compose – workers stuck in Queued and not processing March 28, 2026 n8n Queue Mode Errors
n8n queue mode duplicate execution – why workflows run twice and how to fix it April 4, 2026 n8n Queue Mode Errors
n8n queue mode environment variable missing – EXECUTIONS_MODE and QUEUE_BULL_REDIS_HOST fix March 28, 2026 n8n Queue Mode Errors
