> ## Documentation Index
> Fetch the complete documentation index at: https://hexxladb.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Changelog

> Logical changefeed for audit trails and CDC

## ReadChangelogSince

Read changelog entries from a commit sequence. Requires `Options.ChangelogEnabled`.

```go theme={null}
entries, err := db.ReadChangelogSince(seq)
for _, entry := range entries {
    fmt.Printf("Op: %s, Key: %s\n", entry.Op, entry.Key)
}
```

## ReadChangelogFiltered

Filtered read by op codes and/or key prefix.

```go theme={null}
filter := hexxladb.ChangelogFilter{
    Ops:       []byte{hexxladb.ChangelogOpPutCell, hexxladb.ChangelogOpPutSeam},
    KeyPrefix: []byte("cell/"),
}
entries, err := db.ReadChangelogFiltered(ctx, seq, filter)
```

## ChangelogFilter

```go theme={null}
type ChangelogFilter struct {
    Ops       []byte   // Op codes to include
    KeyPrefix []byte   // Key prefix filter
}
```

## ChangelogRecord

Typed alias of internal record.

```go theme={null}
type ChangelogRecord struct {
    Seq       uint64
    Op        byte
    Key       []byte
    Value     []byte
    Timestamp int64
}
```

## Op codes

Stable op codes:

| Op code                  | Description           |
| ------------------------ | --------------------- |
| `ChangelogOpPutCell`     | Cell put operation    |
| `ChangelogOpPutSeam`     | Seam put operation    |
| `ChangelogOpResolveSeam` | Seam resolution       |
| `ChangelogOpPutFacet`    | Facet put operation   |
| `ChangelogOpPutEdge`     | Edge put operation    |
| `ChangelogOpDeleteCell`  | Cell delete operation |

## See also

* [Changelog](/operations/changefeed) — Changelog concepts and use cases