Process only new records
Schedules and retries mean the same data can arrive twice. Without a guard, duplicate rows stack up and every downstream report drifts from reality. An idempotent write step prevents that.
Add a Data Table Get row(s) node before the insert, then a Code filter that compares city and date — only new pairs reach the writer.
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<cours>Intermediate Workflow Automation with n8n</cours>Exercice interactif pratique
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