import Database from 'better-sqlite3';
/**
 * Opens (or creates) a SQLite database and initializes the schema.
 *
 * @param dataDir - Custom data directory. Defaults to ~/.tft-oracle/.
 *                  Pass ':memory:' for an in-memory database (tests).
 * @returns A better-sqlite3 Database instance with schema applied.
 */
export declare function getDatabase(dataDir?: string): Database.Database;
/**
 * Check if the champions table has any rows.
 */
export declare function hasExistingData(db: Database.Database): boolean;
/**
 * Get metadata value by key.
 */
export declare function getMetadata(db: Database.Database, key: string): string | null;
/**
 * Set metadata value.
 */
export declare function setMetadata(db: Database.Database, key: string, value: string): void;
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