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* fix(studio): check job_run_details size in cron display When cron.job_run_details grows too large (200k+ rows), loading the cron jobs overview can timeout and affect other queries by pulling excessive data into shared buffers. This change: - Estimates table size using pg_stat before fetching cron jobs data - Shows a cleanup notice when the table exceeds the threshold - Provides batched deletion using ctid ranges to avoid buffer pollution - Allows scheduling an automated daily cleanup cron job - Handles timeout errors gracefully with a "suspected overflow" state The useCronJobsData hook now returns a discriminated union status that tracks loading, estimate-error, overflow-confirmed, overflow-suspected, and ready states, allowing the UI to respond appropriately to each case. * fix(studio): use index when querying cron.job_run_details cron.job_run_details is only indexed by runid, not by start_time. Change the query to use the runid index (which gives the same result, since runid is auto-incrementing).