{ "date": "2026-11-02", "experiment": "PostgreSQL 18.6 memory settings, same frozen physical snapshot", "method": { "stages": [ "A1: 128MB shared_buffers", "B: 2GB shared_buffers", "A2: 128MB default repeat" ], "work_mem_profiles": [ "4MB", "16MB", "64MB" ], "effective_cache_size": "4GB in every profile; held fixed", "warmups_per_query_per_profile": 2, "measured_runs": 9, "statement_timeout_seconds": 120, "read_only": true, "query_seed_base": 31415, "production_online": true, "clone_autovacuum": "off to preserve planner statistics", "container_limit": "6GiB RAM; no additional swap; 64MiB /dev/shm", "cache": "OS cache not flushed; shared buffers reset between stages", "timing": "EXPLAIN ANALYZE Execution Time with TIMING OFF" }, "query_sha256": { "ai_stock_screener": "971632162371f9a6e3bd9ca26f7e9860d656443e1a801011ad31031c011bf746", "power_coverage": "8122eff345de4e1bc8c880e77a3fd81f921fce3e5e032cba56b10b5290c3405a", "sec_financial_screener": 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