Module dedup 

Duplicate transaction detection.

Provides three deduplication strategies:

• Structural — exact hash match using crate::fingerprint::structural_hash. Finds transactions that are byte-for-byte identical (excluding metadata).

• Fuzzy — approximate match using date + amount + text similarity. Finds transactions that are likely the same despite minor differences (e.g., different payee formatting between bank and ledger).

• Fingerprint (future, Phase 1) — stable BLAKE3 fingerprint match for import deduplication across runs.

Structs

FuzzyDedupConfig

Configuration for fuzzy duplicate detection.

FuzzyDuplicateMatch

Result of a fuzzy duplicate match.

StructuralDuplicate

Result of finding a structural duplicate.

Functions

find_fuzzy_duplicates

Find fuzzy duplicates between new and existing transactions.

find_structural_duplicates

Find structurally duplicate transactions in a directive list.