oncall: limit HistoryBySchedule to 3 concurrent calls #3334
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Description:
This PR introduces a mechanism to throttle concurrent history queries, preventing the exhaustion of the database connection pool. This is accomplished by introducing a histLim channel to limit the number of concurrent operations.
Additional Info:
The added code limits the concurrent history queries to a maximum of 3. This is to ensure that the database connection pool is not overwhelmed, especially given that these operations can be expensive and may hold a transaction open for extended periods.