| Header | 4096 bytes | Contains magic, spec version (SPEC_MAJOR=2, SPEC_MINOR=1), WAL offsets |
| Embedded WAL | 1–64 MB | Append-only log written before every commit (see WAL protocol) |
| Segments | Variable | Frames, blobs, text chunks, vector chunks stored sequentially |
| Index manifests | Variable | IndexManifests struct in the TOC references each index |
| Time Index Track | Variable | Optional TimeIndexManifest (offset + length + checksum) |
| TOC | Variable | Serialized via bincode with cascading checksums |
| Footer | 48 bytes + magic | CommitFooter storing toc_len, toc_hash, and generation |
