feat(db): Prevent partial app re-addition after deletion #509
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Summary of ChangesHello @IngmarStein, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed! This pull request significantly enhances the robustness of database update operations by implementing explicit existence checks for devices and applications. The primary goal is to prevent a scenario where a deleted entity might be partially re-added to the database due to concurrent field updates. By integrating Highlights
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This pull request effectively prevents a race condition where a device or app could be partially re-created after deletion by adding existence checks to the database update operations. The removal of the unused _update_json_field helper function is also a good simplification. I've added a few comments to improve the robustness of JSON path construction and to fix a minor issue with cursor handling within a transaction.
Summary of ChangesHello @IngmarStein, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed! This pull request significantly enhances the robustness of database operations by introducing explicit existence checks for devices and applications before any update is performed. This mechanism prevents the creation of incomplete or orphaned data entries, particularly in race conditions where an entity might be deleted concurrently with an attempted field update. The changes streamline the update logic by inlining functionality previously handled by a helper function, leading to more resilient data management. Highlights
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This pull request effectively addresses a potential race condition by adding existence checks to database update operations, preventing partial data re-creation for concurrently deleted devices and apps. The removal of the unused _update_json_field function also cleans up the codebase.
My review identifies a consistency issue in how JSON paths are constructed for app instance names (iname). While save_render_messages correctly quotes the iname, other updated functions like update_app_field and save_app do not. This could lead to bugs if an iname contains special characters. I've provided suggestions to align these functions for robust and consistent behavior.
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This pull request effectively addresses a potential race condition by adding existence checks to database update operations, preventing partial re-addition of deleted entities. The changes are consistently applied across several functions, and the removal of the unused _update_json_field helper simplifies the code. The PR also implicitly fixes a bug in JSON path construction for app names containing special characters. My review identified one potential issue in update_device_field where the field parameter lacks validation, which could lead to unintended modifications of nested entities. I've provided a suggestion to address this.
Introduces existence checks (`json_type(data, ?) IS NOT NULL`) in database update operations for devices and apps. This prevents partial data re-addition to the database if an entity (device or app) is deleted concurrently with a field update. Specifically, `update_device_field`, `update_app_field`, `save_app`, and `save_render_messages` now ensure the target entity exists before attempting to modify its fields. The unused `_update_json_field` helper function has also been removed.
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Introduces existence checks (
json_type(data, ?) IS NOT NULL) in database update operations for devices and apps. This prevents partial data re-addition to the database if an entity (device or app) is deleted concurrently with a field update.Specifically,
update_device_field,update_app_field,save_app, andsave_render_messagesnow ensure the target entity exists before attempting to modify its fields. The unused_update_json_fieldhelper function has also been removed.