Data-Integrity on My Bloghttps://thaig2pro.github.io/en/tags/data-integrity/Recent content in Data-Integrity on My BlogHugo -- 0.146.0enWed, 23 Sep 2026 14:00:00 +0700The Formula in the Ticket Subtracted Sales Twice, and Only Two Screenshots Could Prove Ithttps://thaig2pro.github.io/en/posts/cong-thuc-tru-hai-lan/Wed, 23 Sep 2026 14:00:00 +0700https://thaig2pro.github.io/en/posts/cong-thuc-tru-hai-lan/An acceptance criterion defined available stock as intake minus allocated minus sold. Read literally it gave 80; production showed 90. The gap was exactly the units counted twice.The Import That Edited the Wrong Row for Years Because Two Tables Shared the Same IDshttps://thaig2pro.github.io/en/posts/bug-import-tra-nham-bang/Tue, 22 Sep 2026 17:00:00 +0700https://thaig2pro.github.io/en/posts/bug-import-tra-nham-bang/A quota import took a product id and looked it up in a different table. Auto-increment made the ids overlap, so every run changed exactly one row and nobody noticed.Ghost Quota: How a Missing Foreign Key Quietly Lowers a Sales Ceilinghttps://thaig2pro.github.io/en/posts/quota-ma-thieu-foreign-key/Tue, 22 Sep 2026 15:00:00 +0700https://thaig2pro.github.io/en/posts/quota-ma-thieu-foreign-key/An orphaned row in a table with no foreign key used to just skew a report. After a shared-pool feature shipped, the same row started locking real units out of sale.