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Why Your Status Enum Scattered Across Five Files Is a Silent Bug Factory

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A common codebase problem occurs when a single concept like an order status enum gets independently redefined across multiple files — as constants, type unions, SQL constraints, and UI components — with no single source of truth. Each new developer who cannot locate an existing definition simply creates another version, causing silent divergence between representations. The most dangerous consequence is a case-mismatch bug where one file stores 'archived' in lowercase while another expects 'ARCHIVED', causing filtered data to silently disappear with no compiler or runtime error. TypeScript casts and SQL CHECK constraints each validate their own layer independently, so neither catches the cross-layer inconsistency. The core issue is not which representation to choose, but the absence of a canonical, discoverable definition that all parts of the system share.

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Why Your Status Enum Scattered Across Five Files Is a Silent Bug Factory · ShortSingh