-- Migration 020: Opportunity contract files
-- Stores documents that belong to the offer/contract card and can be downloaded independently of comments

CREATE TABLE IF NOT EXISTS pipeline_opportunity_contract_files (
    id SERIAL PRIMARY KEY,
    opportunity_id INTEGER NOT NULL REFERENCES pipeline_opportunities(id) ON DELETE CASCADE,
    filename VARCHAR(255) NOT NULL,
    content_type VARCHAR(100),
    size_bytes INTEGER,
    stored_name TEXT NOT NULL,
    uploaded_by_user_id INTEGER,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    FOREIGN KEY (uploaded_by_user_id) REFERENCES users(user_id) ON DELETE SET NULL
);

CREATE INDEX IF NOT EXISTS idx_pipeline_opportunity_contract_files_opportunity_id ON pipeline_opportunity_contract_files(opportunity_id);

COMMENT ON TABLE pipeline_opportunity_contract_files IS 'Files uploaded directly to the opportunity (Tilbud & Kontrakt) card.';