implement state retrieval and locking infrastructure #2125
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RosaDeMorango
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Enables the Event Producer to fetch the previous state and coordinate execution via distributed locking. Changes: - **Spanner**: Added `GetLatestSavedSearchNotificationEvent` to fetch the last known state for a search/frequency pair. - **Schema**: Added index `SavedSearchNotificationEvents_BySearchAndSnapshotType` to optimize state lookups. - **Producer**: Updated `ProcessSearch` to acquire/release locks (currently using triggerID) and fetch the previous state before diffing. - **Refactor**: Exported `DefaultBrowsers` in `backendtypes` for shared use between the API server and worker adapters
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jrobbins
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Enables the Event Producer to fetch the previous state and coordinate execution via distributed locking.
Changes:
GetLatestSavedSearchNotificationEventto fetch the last known state for a search/frequency pair.SavedSearchNotificationEvents_BySearchAndSnapshotTypeto optimize state lookups.ProcessSearchto acquire/release locks (currently using triggerID) and fetch the previous state before diffing.DefaultBrowsersinbackendtypesfor shared use between the API server and worker adapters