CREATE TABLE search_history (
    id INTEGER PRIMARY KEY NOT NULL,
    timestamp BIGINT NOT NULL,
    query TEXT NOT NULL,
    search_engine TEXT,
    embedding BLOB NOT NULL,
    created_at BIGINT NOT NULL,
    source_file TEXT,
    UNIQUE(timestamp, query)
);

CREATE INDEX idx_search_timestamp ON search_history(timestamp);
CREATE INDEX idx_search_query ON search_history(query);