Introduction It's Black Friday. In the space of a single second, your e-commerce platform processes 4,000 orders, updates inventory counts, triggers fulfillment workflows, and debits customer accounts. Every one of those operations lands in your OLTP database, fast, atomic, precise. None of it, in that same second, tells you that customers are abandoning their carts at three times the normal rate. Your top-selling item has only 200 units left. The discount code you pushed at noon is cannibalizing margin on your highest-LTV segment. That's the gap. Transactions happen in one world. Insight lives in another. And the pipeline connecting them, how fast it moves, how much it loses in transit, how fresh it keeps the data, is quietly one of the most consequential pieces of infrastructure in your entire stack. Here's what most post-mortems won't tell you: the failure wasn't in the code. It was in the architecture.…