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+# PR Simulation README
+
+## Simulation Details
+- **Timestamp**: 2025-11-21T16:15:45+05:30
+- **Original PR**: #155404
+- **Original Title**: schemachanger: add function back-references for unvalidated check constraints
+- **Original Author**: spilchen
+- **Original URL**: https://github.com/cockroachdb/cockroach/pull/155404
+
+## Original PR Timeline
+- **Created**: 2025-10-14T20:43:25Z
+- **Queue Entry**: N/A
+- **CI Start**: N/A
+- **CI Completion**: N/A
+- **Merged**: 2025-10-16T15:53:31Z
+
+## Simulation Purpose
+This PR is part of a merge queue vendor comparison simulation.
+It replicates the timing and behavior of the original PR for testing purposes.
+
+## Timing Information
+- **CI Wait Duration**: N/A
+- **CI Run Duration**: N/A  
+- **Total Queue Duration**: N/A
+
+---
+*Generated by pr-simulation tool at 2025-11-21T16:15:46+05:30*