- Create regex-validation utility with ReDoS detection (nested quantifiers, overlapping alternations, complexity limits) - Add @db.VarChar(500) constraint on pattern field in Prisma schema - Integrate validation in rule-engine at load time and evaluation time - Add 46 unit tests covering syntax, ReDoS patterns, complexity, edge cases Co-Authored-By: Paperclip <noreply@paperclip.ing>