Function RetentionPolicy

RetentionPolicy(options: RetentionPolicyOptions): ClassDecorator
Class decorator that configures an automatic data retention policy for the entity. When one or more entities define a retention policy, the Database runs a background cleanup job that periodically deletes expired records.
Parameters
- options: RetentionPolicyOptions
  Retention configuration. seconds is required.
Returns ClassDecorator
Throws
Error - At decoration time if options.seconds is not a positive integer.

Remarks
The cleanup interval is derived from the GCD of all registered seconds values, ensuring the job runs as infrequently as possible while still honouring every policy. The job uses a cursor-based readwrite transaction and emits debug-level log messages on each tick.
Example
```
@RetentionPolicy({ seconds: 60 * 60 * 24 * 30 }) // 30-day retention
@DataClass()
class Session {
  @KeyPath()
  id!: string;
  userId!: string;
}
```
- Defined in index.ts:1565