-- Create tasks table for background job management
CREATE TABLE IF NOT EXISTS tasks (
    id SERIAL PRIMARY KEY,
    task_type VARCHAR(50) NOT NULL, -- e.g., 'nasa_download'
    status VARCHAR(20) NOT NULL DEFAULT 'pending', -- pending, running, completed, failed, cancelled
    description VARCHAR(255),
    params JSONB, -- Store input parameters (body_ids, dates)
    result JSONB, -- Store output results
    progress INTEGER DEFAULT 0, -- 0 to 100
    error_message TEXT,
    created_by INTEGER, -- User ID who initiated
    created_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP,
    started_at TIMESTAMP WITH TIME ZONE,
    completed_at TIMESTAMP WITH TIME ZONE
);

CREATE INDEX idx_tasks_status ON tasks(status);
CREATE INDEX idx_tasks_created_at ON tasks(created_at DESC);