retentionWindowDays property
Retains the data for the specified number of days.
User must set a value lower than Dialogflow's default 365d TTL (30 days for Agent Assist traffic), higher value will be ignored and use default. Setting a value higher than that has no effect. A missing value or setting to 0 also means we use default TTL. When data retention configuration is changed, it only applies to the data created after the change; the TTL of existing data created before the change stays intact.
Implementation
core.int? retentionWindowDays;