Review prompt never fired for 57 days due to a camelCase column mismatch

A review-request gate for CogniPrep customers silently read zero for every purchaser between 16 September and 12 November. The cause was a Postgres client transform that converts column names to camelCase, while raw SQL queries were still reading snake_case keys. Only the three since-purchase counts and the first-purchase timestamp were affected, while single-word aliases came through correctly. Because a zero looks like a legitimate new customer, the failure raised no error or alert. The team fixed it by quoting camelCase aliases explicitly in its raw queries, which works regardless of the transform configuration.