[Improvement-18439][API]Add composite index idx_project_start_time for workflow instance query - #18440
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Purpose of the pull request
close #18439
Brief change log
The queryWorkflowInstanceListPaging API is experiencing slow response times when querying workflow instances for projects with large amounts of historical data.
This commit adds a composite index (project_code, start_time) to the t_ds_workflow_instance table to optimize the common query pattern that filters by project_code and sorts by start_time.
Since project_code and start_time remain virtually unchanged after an instance is created, the index maintenance overhead is minimal. At the same time, it significantly boosts query performance for the most common scenarios.
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This pull request is code cleanup without any test coverage.
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Pull Request Notice
Pull Request Notice
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