Four posts to start with — one each from databases, SRE, engineering management, and AI.
Six months in, p_future holds 800M rows because the growth projection didn't survive the workload, and every ALTER to fix it needs a maintenance window nobody wants to schedule. The boundary management is two lines of DDL; the harder part is picking a partition key that doesn't leak into application code.
Coinbase paid Datadog $65M in 2021. The number didn't come out of an internal cost review — it came out of Datadog's earnings call, when an analyst asked about a single 'large upfront bill' that didn't recur at the same level the next year. Smaller versions of the same pattern run on every team's account.
NYC port had less infrastructure than Boston or Charleston in 1817. By 1830 it was the dominant Atlantic port. The difference was one decision in 1818: a published shipping schedule that ran whether the hold was full or not.
An analyst asks the assistant for Q1 revenue per enterprise customer. The model joins four tables, applies what looks like the right `status = 1` filter, returns $4.2M. The number is $1.4M too high, the bridge table is multiplying rows, status = 1 means 'pending' not 'active', and the date filter constrains the wrong column. EXPLAIN was clean. Nothing flagged it.