Real decisions building pipelines, models and data governance.https://joseluisalba.com/en-ushttps://joseluisalba.com/blog/herd-settles-before-counting/https://joseluisalba.com/blog/herd-settles-before-counting/A reconciliation test kept flagging mismatches that weren't data errors — it was measuring the gap between when the data was copied and when it was checked.Wed, 02 Sep 2026 00:00:00 GMThttps://joseluisalba.com/blog/rate-belongs-to-the-fact/https://joseluisalba.com/blog/rate-belongs-to-the-fact/Converting currency at query time gives you the right number and is still the wrong architecture.Mon, 10 Aug 2026 00:00:00 GMThttps://joseluisalba.com/blog/the-reasoning-doesnt-migrate/https://joseluisalba.com/blog/the-reasoning-doesnt-migrate/The same table that was right on-premises turns expensive in the cloud, and the model never changed.Mon, 10 Aug 2026 00:00:00 GMThttps://joseluisalba.com/blog/a-copy-has-no-opinions/https://joseluisalba.com/blog/a-copy-has-no-opinions/Why storing only balance changes isn't enough for month-end reporting — the fix isn't one table doing both jobs, it's two layers with different jobs: the one that copies and the one that answers.Mon, 03 Aug 2026 00:00:00 GMThttps://joseluisalba.com/blog/average-balance-is-captured/https://joseluisalba.com/blog/average-balance-is-captured/Why daily average balance in banking can't be rebuilt after the fact — the real decision was choosing which accrual tables to snapshot daily, knowing the cost is permanent.Mon, 20 Jul 2026 00:00:00 GMT