feat(store-sqlite): add truncate_embedding_records helper

Wipes every row from embedding_records and returns the deleted row
count. Used by the upcoming `kebab reset --vector-only` to keep SQLite
consistent after the on-disk Lance store is removed.

Plan deviation from the original spec (task 1):
- Original test plan opened SqliteStore with a raw path; the actual
  signature is `SqliteStore::open(&Config)`, so the integration test
  builds a Config with `storage.data_dir` pointed at a tempdir.
- Original return type was Result<()>; bumped to Result<u64> so the
  caller (kebab-app::reset) can surface the truncated count in the
  reset_report.v1 wire payload without a separate COUNT query.

p9-fb-06 task 1.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

crates/kebab-store-sqlite/src/embeddings.rs

@@ -107,6 +107,22 @@ impl SqliteStore {
     /// WHERE embedding_id IN (?, ?, …)`) inside one transaction —
     /// avoids the per-row `execute()` round-trip the previous
     /// implementation paid.
+    /// Wipe every row from `embedding_records`, returning the count of
+    /// rows that were removed. Called by `kebab reset --vector-only` so
+    /// SQLite cannot point at a Lance row that the reset just removed
+    /// off-disk.
+    ///
+    /// The function does NOT cascade to `chunks` or `documents` — those
+    /// are kept so the next `kebab ingest` re-embeds the existing chunk
+    /// set without re-parsing.
+    pub fn truncate_embedding_records(&self) -> Result<u64> {
+        let conn = self.lock_conn();
+        let n = conn
+            .execute("DELETE FROM embedding_records", [])
+            .context("DELETE FROM embedding_records")?;
+        Ok(n as u64)
+    }
+
     pub fn mark_embedding_records_committed(
         &self,
         embedding_ids: &[String],

crates/kebab-store-sqlite/tests/truncate_embeddings.rs

@@ -0,0 +1,119 @@
+//! `truncate_embedding_records` wipes every row regardless of status.
+//!
+//! Used by `kebab reset --vector-only` to keep SQLite in sync after the
+//! Lance vector store is deleted off-disk. The helper is exposed at the
+//! integration-test boundary so consumers (kebab-app's reset module) can
+//! verify its semantics without reaching into private store internals.
+
+use kebab_config::Config;
+use kebab_store_sqlite::{EmbeddingRecordRow, SqliteStore};
+use rusqlite::params;
+use tempfile::TempDir;
+use time::OffsetDateTime;
+
+fn config_for(tmp: &TempDir) -> Config {
+    let mut c = Config::defaults();
+    c.storage.data_dir = tmp.path().to_string_lossy().into_owned();
+    c
+}
+
+fn open_store(tmp: &TempDir) -> SqliteStore {
+    let cfg = config_for(tmp);
+    let store = SqliteStore::open(&cfg).unwrap();
+    store.run_migrations().unwrap();
+    store
+}
+
+/// Seed an asset + document + chunk so an `embedding_records` row inserted
+/// against `chunk_id` does not violate the chunks FK. Mirrors the helper
+/// used by the in-crate `embeddings::tests` module — copied here because
+/// integration tests cannot reach the private `seed_chunk` from outside
+/// the crate.
+fn seed_chunk(store: &SqliteStore, chunk_id: &str) {
+    let conn = store.read_conn();
+    conn.execute(
+        "INSERT INTO assets (
+            asset_id, source_uri, workspace_path, media_type, byte_len,
+            checksum, storage_kind, storage_path, discovered_at
+         ) VALUES (?, ?, ?, ?, ?, ?, 'reference', '/tmp/x', ?)",
+        params![
+            "0123456789abcdef0123456789abcdef",
+            "file:///tmp/x",
+            "x.md",
+            "{}",
+            0_i64,
+            "deadbeef",
+            "1970-01-01T00:00:00Z",
+        ],
+    )
+    .unwrap();
+    conn.execute(
+        "INSERT INTO documents (
+            doc_id, asset_id, workspace_path, title, lang, source_type,
+            trust_level, parser_version, doc_version, schema_version,
+            metadata_json, provenance_json, created_at, updated_at
+         ) VALUES (?, ?, ?, NULL, NULL, 'fs', 'unverified', 'v1', 1, 1, '{}', '{}', ?, ?)",
+        params![
+            "fedcba9876543210fedcba9876543210",
+            "0123456789abcdef0123456789abcdef",
+            "x.md",
+            "1970-01-01T00:00:00Z",
+            "1970-01-01T00:00:00Z",
+        ],
+    )
+    .unwrap();
+    conn.execute(
+        "INSERT INTO chunks (
+            chunk_id, doc_id, text, heading_path_json, section_label,
+            source_spans_json, token_estimate, chunker_version,
+            policy_hash, block_ids_json, created_at
+         ) VALUES (?, ?, 'hi', '[]', NULL, '[]', 1, 'v1', 'hash', '[]', ?)",
+        params![
+            chunk_id,
+            "fedcba9876543210fedcba9876543210",
+            "1970-01-01T00:00:00Z"
+        ],
+    )
+    .unwrap();
+}
+
+fn count_rows(store: &SqliteStore) -> i64 {
+    let conn = store.read_conn();
+    conn.query_row("SELECT COUNT(*) FROM embedding_records", [], |r| r.get(0))
+        .unwrap()
+}
+
+#[test]
+fn truncate_removes_all_rows_and_returns_count() {
+    let tmp = TempDir::new().unwrap();
+    let store = open_store(&tmp);
+    let chunk = "11112222333344445555666677778888";
+    seed_chunk(&store, chunk);
+
+    let row = EmbeddingRecordRow {
+        embedding_id: "aaaa1111bbbb2222cccc3333dddd4444".to_string(),
+        chunk_id: chunk.to_string(),
+        model_id: "test-model".to_string(),
+        model_version: "v1".to_string(),
+        dimensions: 4,
+        lance_table: "chunk_embeddings_test_model_4".to_string(),
+        created_at: OffsetDateTime::now_utc(),
+    };
+    store
+        .put_embedding_records_pending(std::slice::from_ref(&row))
+        .unwrap();
+    assert_eq!(count_rows(&store), 1);
+
+    let removed = store.truncate_embedding_records().unwrap();
+    assert_eq!(removed, 1);
+    assert_eq!(count_rows(&store), 0);
+}
+
+#[test]
+fn truncate_on_empty_table_is_noop() {
+    let tmp = TempDir::new().unwrap();
+    let store = open_store(&tmp);
+    let removed = store.truncate_embedding_records().unwrap();
+    assert_eq!(removed, 0);
+    assert_eq!(count_rows(&store), 0);
+}