UNPATCHED PostgreSQL

Test 1: track='none' (clean baseline, no pg_stat_statements overhead)
- Run 1: 575.843 ms
- Run 2: 554.241 ms  
- Run 3: 556.117 ms

Average: 562.07 ms

Test 2: track='all' (with pg_stat_statements tracking)
- Run 1: 725.412 ms
- Run 2: 713.809 ms
- Run 3: 718.276 ms

Average: 719.17 ms

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PATCHED PostgreSQL (with stats_last_updated column)

Test 1: track='none' (clean baseline, no pg_stat_statements overhead)
- Run 1: 540.163 ms
- Run 2: 568.065 ms
- Run 3: 538.595 ms  

Average: 548.95 ms

Test 2: track='all' (with pg_stat_statements + stats_last_updated)
- Run 1: 737.379 ms
- Run 2: 725.067 ms
- Run 3: 735.044 ms

Average: 732.50 ms