Introduce `WorkflowHeartbeatMiddleware` to monitor workflow liveness and update timestamps during execution. Extend WorkflowInstanceStore implementations to support updating the `UpdatedAt` timestamp across various data stores. Enhance Dapper query builder and workflow execution pipeline with related functionality. |
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| .. | ||
| Document.cs | ||
| MongoDbStore.cs | ||
| PersistenceFeatureBase.cs | ||