/**
 * DDL translator for the graph-database backend.
 *
 * Emits Cypher `CREATE NODE TABLE` + `CREATE REL TABLE` statements that
 * mirror the semantic shape of the DuckDB schema ({@link generateSchemaDDL})
 * while honouring two architectural decisions from spec 004:
 *
 *   1. **Polymorphic rel tables, one per edge kind.** Each OCH relation
 *      kind (24 live in `duckdb-adapter.ts:ALL_RELATION_TYPES` at the time
 *      of writing — the v1.1 schema added `OWNED_BY` / `DEPENDS_ON` /
 *      `FOUND_IN` past the spec 004 draft's "23 kinds" count) gets its own
 *      named REL TABLE with multiple `FROM/TO` pairs. A single
 *      `CodeRelation` table with a `type` discriminator column would
 *      defeat columnar predicate push-down, so we fan out to keep the
 *      planner honest. See the graph-db backend's
 *      `cypher/data-definition/create-table` doc page.
 *
 *   2. **Source-level naming avoids banned clean-room literals.** OCH
 *      uses `PROCESS_STEP` where a prior-art project used a different
 *      identifier; this translator only ever emits `PROCESS_STEP` so
 *      Cypher queries match the graph's own relation-type enum.
 *
 * The DuckDB schema collapses every node kind into a polymorphic `nodes`
 * table (`schema-ddl.ts`). For the graph-db backend we keep the same
 * collapse — a single `CodeNode` NODE TABLE — so graphHash parity (U1) is
 * straightforward: round-trips read the same column set from both stores.
 * Later ACs may split the table per kind once profile data justifies the
 * extra surface area.
 */
export interface GraphDbSchemaOptions {
    /** Dimension for the fixed-size FLOAT array used by the embedding rel. */
    readonly embeddingDim?: number;
}
/**
 * Exported for the round-trip parity tests so they can compare against
 * the same source of truth as the DDL emitter.
 */
export declare function getAllRelationTypes(): readonly string[];
/**
 * Returns the complete Cypher DDL as a single string — statements separated
 * by `;` so callers can split on that boundary if they need per-statement
 * execution. The last statement carries a trailing `;` for symmetry.
 */
export declare function generateSchemaDdl(opts?: GraphDbSchemaOptions): string;
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