> ## Documentation Index
> Fetch the complete documentation index at: https://docs.quanux.org/symphony/llms.txt
> Use this file to discover all available pages before exploring further.

# SCLV: Symphony Change Ledger Vector for Source Changes

> SCLV maintains an append-only ledger of completed source changes with provider-neutral proposals, non-mutating recovery, and disposable projections for the record.

The Symphony Change Ledger Vector (SCLV) records changes made to SKV surfaces over time. Its engine is an independently installable C++ process that performs deterministic append-only ledger checks and produces disposable projections. The ledger is written only after a material source change is complete.

## Operations

* **Inspect and check**: validate ledger shape, continuity, and evidence.
* **Propose (v3)**: accept caller-declared, provider-neutral proposals for new records.
* **Recover**: perform non-mutating recovery of interrupted or ambiguous state.
* **Project**: emit disposable inventories of ledger state on request.

## Admission and retirement

Every admitted SCLV record binds current indexed evidence at the time it is written. Later legitimate retirement of a surface preserves the immutable historical provenance without forcing deleted current prose back into SKVI. History remains history; current truth remains current.

## What SCLV does not do

* SCLV does not create or approve source changes.
* SCLV does not rewrite existing records; it is append-only.
* SCLV does not publish anything. Public projection belongs to SODV.

<Note>
  Every current SKV engine is read, query, validate, and propose only. Canonical apply is disabled until each engine's full authority and audit contracts are complete.
</Note>

## Related surfaces

<CardGroup cols={2}>
  <Card title="SKVI" icon="magnifying-glass" href="/symphony/symphony/skv/skvi">
    Indexes current canonical truth that SCLV records bind to.
  </Card>

  <Card title="SODV" icon="scroll" href="/symphony/symphony/skv/sodv">
    Governs official public projection of ledger information.
  </Card>

  <Card title="SEV" icon="arrow-trend-up" href="/symphony/symphony/skv/sev">
    Evolution cases assess changes before SCLV records them.
  </Card>

  <Card title="qxctl vector commands" icon="terminal" href="/symphony/symphony/qxctl/vector-commands">
    Run `qxctl sclv ...` for inspect, check, propose, and recover.
  </Card>
</CardGroup>


## Related topics

- [SEV: Symphony Evolution Vector for Planned Changes](/symphony/symphony/skv/sev.md)
- [SKVI: The Symphony Knowledge Vector Index Engine](/symphony/symphony/skv/skvi.md)
- [Symphony Knowledge Vector: SKV Framework Overview](/symphony/symphony/skv/overview.md)
- [Symphony Vectors and Delivery Phases](/symphony/symphony/concepts/vectors.md)
- [SCV Source-Knowledge Engines: Provider Reality for Symphony](/symphony/symphony/engines/scv-source-engines.md)