/**
 * DDL emitter for the DuckDB-backed temporal store.
 *
 * Two tables only:
 *   - `cochanges` — file-level association statistics from git history.
 *   - `symbol_summaries` — structured per-symbol summaries from the
 *     ingestion summarize phase, keyed by
 *     `(node_id, content_hash, prompt_version)`.
 *
 * The graph tier (nodes/edges/embeddings/store_meta) lives in the lbug
 * graph artifact; this DDL is intentionally narrow.
 */
export interface SchemaOptions {
    /**
     * Retained for API symmetry with the prior multi-tier schema; the
     * temporal-only DDL never references it. Callers that supply it pay
     * one validation check; omitting it is also accepted.
     */
    readonly embeddingDim?: number;
}
/**
 * Returns a sequence of DDL statements that must be executed in order.
 */
export declare function generateSchemaDDL(_opts?: SchemaOptions): readonly string[];
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