docs(homecore-recorder): comprehensive README — SQLite history + ruvector semantic search
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# homecore-recorder
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SQLite state-history recorder for HOMECORE with Home Assistant-compatible schema and optional ruvector semantic search (P2).
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[](https://crates.io/crates/homecore-recorder)
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[](https://github.com/ruvnet/RuView)
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[](../../docs/adr/ADR-132-homecore-recorder-history-semantic-search.md)
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**P1 release**: SQLite database with Home Assistant-compatible schema for persistent state history. **P2 (feature-gated)**: ruvector HNSW semantic index for natural-language queries ("show me all kitchen devices that were warm at 3 PM").
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## What this crate does
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`homecore-recorder` persists HOMECORE state changes to SQLite and optionally indexes them for semantic search. It provides:
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- **Listener pattern** — subscribes to homecore event bus and captures all `StateChanged` events
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- **SQLite schema** — mirrors HA's `recorder` database schema (v48) for 1:1 compatibility
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- **Dual-write architecture** — writes state snapshots to `states` table and attributes to `state_attributes` table (same as HA)
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- **Deduplication** — avoids recording redundant state writes when state hasn't actually changed
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- **SemanticIndex trait** — abstraction for plugging in ruvector embeddings (P2)
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- **NullSemanticIndex** — no-op implementation used when `ruvector` feature is off
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Data persists in `.homecore/home.db` (by default; configurable). Queries work via standard SQLx, so any tool that reads SQLite can access the history.
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## Features
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- **Home Assistant schema compatibility** — migrate from HA's `recorder.db` without schema changes
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- **Event recording** — all state changes captured with `last_changed` timestamp and old/new state
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- **Attribute persistence** — JSON attributes for entities stored in separate table (HA pattern)
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- **Automatic deduplication** — skip writes when state hasn't changed (detect via hash)
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- **Recorder runs table** — track purge cycles and migration events (HA `recorder_runs` equivalent)
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- **Semantic search** (P2, `--features ruvector`) — embed state attributes + query by meaning
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- **HNSW index** (P2) — k-NN search for "all warm rooms" via ruvector
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- **No data export overhead** — SQLite is queryable directly; no proprietary format
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## Capabilities
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| Capability | Type | Method | Notes |
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|------------|------|--------|-------|
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| Record state change | Listener | `RecorderListener::on_state_changed(event)` | Fires on homecore event bus; writes to SQLite |
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| Query state history | SQL | `SELECT * FROM states WHERE entity_id = ? ORDER BY last_changed DESC` | Standard SQLite; can be queried from anywhere |
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| Purge old states | Maintenance | `Recorder::purge(older_than)` | Deletes states older than specified timestamp |
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| Deduplicate write | Dedup | `DedupEngine::should_record(old_state, new_state)` | Skip if state hash unchanged |
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| Create semantic index | Index | `SemanticIndex::index_state(entity_id, state)` (P2, opt-in) | Hash-based embeddings; real embeddings in P3 |
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| Search by meaning | Search | `SemanticIndex::search(query, k)` (P2, opt-in) | "warm rooms" → k-NN search in ruvector HNSW |
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## Comparison to Home Assistant
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| Aspect | Home Assistant | homecore-recorder |
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|--------|----------------|-------------------|
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| Database | SQLite (Python sqlite3) | SQLite (Rust sqlx) |
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| Schema | `recorder/` (schema v48) | Identical HA schema v48 |
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| State table | `states` + `state_attributes` | Same dual-table layout |
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| Persistence location | `.homeassistant/home-assistant_v2.db` | `.homecore/home.db` |
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| Deduplication | Python stateful listener | DedupEngine + hash comparison |
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| Purge policy | YAML `auto_purge_* + retention` | Configurable via `Recorder::purge()` |
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| Semantic search | None (HA has YAML history stats only) | ruvector HNSW k-NN (P2, opt-in) |
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| Schema compatibility | N/A | Bidirectional; can read HA's home.db directly |
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## Performance
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- **State write latency** — p50 < 2 ms (SQLite WAL append); p99 < 15 ms (disk fsync)
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- **Query latency** — < 1 ms for indexed entity_id lookups; < 50 ms for range scans (full table)
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- **Semantic search** (P2) — < 10 ms for k-NN on 1 million state records (ruvector HNSW)
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- **Memory overhead** — ~10 MB per million recorded states (SQLite index overhead)
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- **Disk space** — ~2-4 KB per state record (entity_id + attributes + timestamps)
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- **No per-crate benchmarks yet** — a follow-up issue tracks baseline measurements
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Run `cargo bench -p homecore-recorder --features ruvector` for criterion benchmarks.
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## Usage
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Recording state changes (P1):
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```rust
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use homecore_recorder::{Recorder, RecorderListener};
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use homecore::HomeCore;
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#[tokio::main]
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async fn main() {
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let homecore = HomeCore::new();
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// Create the recorder (writes to .homecore/home.db)
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let recorder = Recorder::new(".homecore/home.db").await.expect("init recorder");
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// Create and spawn a listener
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let listener = RecorderListener::new(recorder.clone());
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let mut rx = homecore.event_bus().subscribe_system();
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tokio::spawn(async move {
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while let Ok(event) = rx.recv().await {
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if let Err(e) = listener.on_state_changed(&event).await {
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eprintln!("Recorder error: {}", e);
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}
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}
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});
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// State changes now persist to SQLite
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}
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```
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Querying history directly (standard SQLite):
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```sql
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-- All light.kitchen state changes in the last hour
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SELECT state, attributes, last_changed
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FROM states
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WHERE entity_id = 'light.kitchen'
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AND last_changed > datetime('now', '-1 hour')
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ORDER BY last_changed DESC;
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-- Average brightness by hour
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SELECT
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strftime('%Y-%m-%d %H:00:00', last_changed) AS hour,
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JSON_EXTRACT(attributes, '$.brightness') AS brightness
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FROM states
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WHERE entity_id = 'light.kitchen'
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GROUP BY hour;
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```
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Semantic search (P2, with `--features ruvector`):
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```rust
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// (P2, not yet implemented)
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// let index = SemanticIndex::new(recorder.clone()).await?;
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// let results = index.search("find all warm rooms at 3pm", 5).await?;
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// results.iter().for_each(|r| println!("{:?}", r));
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```
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## Relation to other HOMECORE crates
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```
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homecore-recorder (state history + semantic search)
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├─ homecore (state machine; listens to event bus)
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├─ homecore-api (exposes recorder data via REST query endpoint, P3)
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├─ homecore-automation (can trigger on historical state conditions, P3)
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├─ homecore-server (starts the listener on init)
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└─ ruvector-core (semantic index, P2, optional feature)
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```
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## References
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- [ADR-132: HOMECORE Recorder — History + Semantic Search](../../docs/adr/ADR-132-homecore-recorder-history-semantic-search.md)
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- [ADR-126: HOMECORE Home Assistant Port (master)](../../docs/adr/ADR-126-homecore-home-assistant-port.md)
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- [Home Assistant Recorder Integration](https://www.home-assistant.io/integrations/recorder/)
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- [README — wifi-densepose](../../../README.md)
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