-- Training tasks table for async training job management.
-- Inference service writes pending tasks; training service polls and executes.

CREATE TABLE IF NOT EXISTS training_tasks (
    task_id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    status VARCHAR(20) NOT NULL DEFAULT 'pending',
    config JSONB,
    created_at TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT NOW(),
    scheduled_at TIMESTAMP WITH TIME ZONE,
    started_at TIMESTAMP WITH TIME ZONE,
    completed_at TIMESTAMP WITH TIME ZONE,
    error_message TEXT,
    model_path TEXT,
    metrics JSONB
);

CREATE INDEX IF NOT EXISTS idx_training_tasks_status ON training_tasks(status);
CREATE INDEX IF NOT EXISTS idx_training_tasks_created ON training_tasks(created_at);