Use staging version file for entities import

[vish-cs]

No description provided.

[gemini-code-assist]

Summary of Changes

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This pull request refactors the entity import validation process by introducing a more robust versioning check. It moves away from a simple file existence check (DONE file) to reading a staging_version.txt file. This file is expected to contain the date of the latest successful import, which is then compared against the current date to confirm the validity and currency of the import data. This change streamlines the import verification and ensures that the system processes the intended version of entities.

Highlights

• File Name Change: The constant FILE_NAME has been updated from 'DONE' to 'staging_version.txt', indicating a change in the sentinel file used for import validation.
• GCS Path Structure Update: The construction of the GCS file_path no longer includes the current_date as a subdirectory. The staging_version.txt file is now expected directly under the entity type directory.
• Import Validation Logic Refinement: The validation mechanism has been enhanced. Instead of merely checking for the existence of a file, the system now downloads the content of staging_version.txt and verifies that its content matches the current_date, ensuring a specific version of import data is present.

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[gemini-code-assist]

Code Review

This pull request updates the entity processing script to validate against a version file in GCS, specifically reading a date from staging_version.txt. A critical security concern is the identified high-severity Path Traversal vulnerability, where unvalidated user input is used to construct a file path for Google Cloud Storage, potentially allowing arbitrary file reads. Strict allow-list validation on the user-provided entity type is strongly recommended to mitigate this. Additionally, the script needs to handle potential unhandled exceptions if the version file is missing and improve the robustness of date comparisons against extra whitespace.