Inconsistent `update_date` and `import_date` persistence in I2B2 tables
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enhancement
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- Java
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描述
There is an inconsistency in how `update_date` and `import_date` are being persisted between `observation_fact` and `visit_dimension` tables in i2b2:
* In `observation_fact` both `update_date` and `import_date` reflect the last update timestamp
* In `visit_dimension` both `update_date` and `import_date` reflect the first import timestamp
This inconsistency makes it difficult to track the actual history of data changes and imports. The behavior should be standardized across both tables to maintain data integrity and provide accurate temporal information.
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