/**
 * Transform unsafe migration SQL emitted by the diff/sql-emit pipeline into
 * safe SQL.
 *
 * `CREATE INDEX` → `CREATE INDEX CONCURRENTLY`, and the
 * `-- pipework:no-transaction` pragma is prepended so the runner applies the
 * migration outside a transaction (CONCURRENTLY cannot run inside one).
 *
 * Foreign-key safety (`NOT VALID` + `VALIDATE CONSTRAINT`) is decided upstream
 * in `emitSQL`: Postgres rejects `NOT VALID` foreign keys on partitioned
 * tables, and only the op metadata knows which tables are partitioned. A
 * text-level pass here cannot tell, so it must not touch foreign keys. Issue #312.
 */
export declare function postProcessMigration(sql: string): string;
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