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77c8c0a501
From experimenting in production we found a "!=" caused the engine to use a sequential scan, whereas explicitly listing all the types ensured an index scan was used. We also found that querying for many (over 100K) items leads to the task stalling - no logs, but no evidence of it running either - so we also add a limit to the query. Since the query now only returns a subset of notifications, we need to ensure the subsequent "update" query operates on the same batch. Also, as a temporary measure, we have a loop in the task code to ensure it operates on the total set of notifications to "time out", which we assume is less than 500K for the time being.