Mikhail Shytsko: Forty Deletes Vanished From pg_stat_statements

PostgreSQL's pg_stat_statements module reports that forty DELETE statements “vanished” from the query statistics, with pg_stat_statements_info.dealloc showing a count of 20 and no trace of the deletions once they completed. For website owners who rely on PostgreSQL to store visitor logs, session data, or user‑generated content, this gap means that automated cleanup jobs or security‑related bots that issue DELETE commands may disappear from performance dashboards and audit logs. Without visibility, you cannot confirm whether a bot is correctly pruning stale data, or whether a malicious actor is silently removing records. The missing entries also skew query‑cost analysis, potentially leading you to underestimate the impact of bulk deletions on replication lag or backup windows. **Actionable tips:** 1. Enable detailed logging for all DELETE statements (log_statement = ‘all’) and pipe the logs through llms.txt to tag known bot user‑agents, ensuring you capture deletions even when pg_stat_statements drops them. 2. Deploy an external query‑monitoring tool (e.g., pgBadger or pganalyze) that parses the raw log files; configure it to alert when the number of DELETEs exceeds a baseline for a given endpoint. 3. Add a custom rule in your llms.txt file to block or rate‑limit unidentified bots that issue high‑volume DELETE requests, protecting both performance and data integrity.