Passive Projections

Mark a projection as passive (not actively observing) using [Passive]:

[Passive]
public record HistoricalSnapshot(
    [Key]
    Guid Id,

    [SetFrom<SnapshotCreated>]
    string Data);

When to use

• On-demand projections that are only rebuilt when explicitly requested
• Historical snapshots
• Resource-intensive projections that shouldn't run continuously

Best practices

• Use for expensive projections that are only needed occasionally
• Consider the trade-off between resource usage and data freshness
• Ensure you have mechanisms to trigger rebuilds when needed