/**
 * MongoDB Index Management
 *
 * Register and create indexes declaratively.
 * Extracted from mongo.ts — pure code movement.
 */
export interface IndexDefinition {
    /** Collection name */
    collection: string;
    /** Fields and sort direction (1 = asc, -1 = desc) */
    fields: Record<string, 1 | -1>;
    /** Create a unique constraint */
    unique?: boolean;
    /** Sparse index (only index docs that have the field) */
    sparse?: boolean;
    /** TTL index — auto-delete documents after N seconds */
    expireAfterSeconds?: number;
}
/**
 * Register an index to be created when ensureIndexes() is called.
 * Call this at module load time to declare your indexes alongside your queries.
 *
 * ```typescript
 * registerIndex({ collection: 'users', fields: { email: 1 }, unique: true });
 * registerIndex({ collection: 'sessions', fields: { userId: 1, startedAt: -1 } });
 * registerIndex({ collection: 'tokens', fields: { expiresAt: 1 }, expireAfterSeconds: 0 });
 * ```
 */
export declare function registerIndex(definition: IndexDefinition): void;
/**
 * Create all registered indexes.
 * Call once at application startup. Safe to call multiple times —
 * MongoDB skips indexes that already exist.
 *
 * ```typescript
 * // In your app startup:
 * import { ensureIndexes } from '@/core/db/index.js';
 * await ensureIndexes(); // creates all registered indexes
 * await ensureIndexes({ dryRun: true }); // just logs what would be created
 * ```
 */
export declare function ensureIndexes(options?: {
    dryRun?: boolean;
}): Promise<{
    created: string[];
    skipped: string[];
}>;
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