Function buildTransactionSortKey

buildTransactionSortKey(tx: Record<string, unknown>): string
Build a composite sort key for deterministic same-day ordering.

Key structure: day|weight|group|created|id This ensures:
- Same-day transactions are ordered by domain weight
- Within same weight, grouped by security_id for locality
- Within same group, ordered by created timestamp
- Final tiebreaker by transaction id for determinism
Parameters
- tx: Record<string, unknown>
Returns string
Throws
OcpValidationError if tx.date is missing or invalid - fail fast on malformed records
- Defined in src/utils/cantonOcfExtractor.ts:189