sequenceDiagram
    participant E as Engine
    participant G as Gemini Flash (Search)
    participant DB as Postgres DB

    Note over E: Round 1 (Initial)
    E->>G: Research brand facts (Grounding ON)
    G-->>E: Return facts and source URLs
    E->>DB: Save round 1 facts and citations

    loop Rounds 2 to N (until no fresh facts)
        Note over E: Accumulate facts
        E->>G: Find NEW facts excluding previous
        G-->>E: Return delta facts and sources
        alt New facts found
            E->>DB: Save delta facts and citations
        else No new facts / Empty delta
            Note over E: Stop iterative search
        end
    end

    Note over E: Trigger Fact and Gap Checker