CREATE TABLE IF NOT EXISTS document_diagnostic_outputs (
    id SERIAL PRIMARY KEY,
    document_id INTEGER NOT NULL REFERENCES documents(id) ON DELETE CASCADE,
    engine VARCHAR(80) NOT NULL,
    output_type VARCHAR(80) NOT NULL,
    version_number INTEGER NOT NULL,
    file_path TEXT,
    status VARCHAR(40) NOT NULL DEFAULT 'created',
    error_message TEXT,
    metadata_json JSONB DEFAULT '{}'::jsonb,
    is_selected BOOLEAN NOT NULL DEFAULT false,
    created_at TIMESTAMP WITHOUT TIME ZONE DEFAULT NOW(),
    updated_at TIMESTAMP WITHOUT TIME ZONE DEFAULT NOW(),
    UNIQUE(document_id, engine, output_type, version_number)
);

CREATE INDEX IF NOT EXISTS ix_document_diagnostic_outputs_document_id
ON document_diagnostic_outputs(document_id);

CREATE INDEX IF NOT EXISTS ix_document_diagnostic_outputs_lookup
ON document_diagnostic_outputs(document_id, engine, output_type);