# Database V2 Read-only Parser

## Problem

Crates and files do not explain every orange track in Serato. The legacy
`database V2` contains Serato's library-level track paths and metadata, so it must
be inspected independently from crate references.

## Architecture

The parser reads the file as a big-endian tag-length-value stream. Top-level
`otrk` records contain nested fields including `pfil` (path), `tsng` (title),
`tart` (artist), `talb` (album), and `tgen` (genre). Text is UTF-16 big-endian.

Analysis reports total database entries, entries whose filenames occur in the
selected music scan, entries outside that scan, scanned tracks absent from the
database, and duplicate database paths. “Outside scan” is deliberately not called
missing because Serato databases can include samples and tracks from other roots.

## Safety

The parser calls only `read_bytes`; it never opens the database for writing. No
metadata values or personal paths are sent to logs or the dashboard.

## Verification

Synthetic TLV fixtures cover version, paths, metadata, incomplete records, and
health integration. The sample library includes a generated ten-entry database.