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Implements a safe in-memory paging helper with metadata and boundary handling.
Implements bounded filtering and deterministic keyset pagination without accepting arbitrary query expressions.
Creates a resource through an explicit request DTO and returns typed 201, 409, and validation outcomes.
Implements invoice total calculation with quantity, unit price, percentage discount, and rounding.
Implements a small in-memory fixed-window rate limiter with per-key counters.
Parses a simple filter expression into a validated dictionary without accepting arbitrary keys.
Updates only public mutable fields and leaves ownership, status, and audit values server-controlled.
Implements safe redaction of known sensitive keys in a dictionary before logging.
Produces field-keyed validation errors through one reusable endpoint boundary.
Implements a small validation helper for date ranges with clear error messages.