-- SQLite does not support DROP COLUMN directly; recreate table without frame_end
CREATE TABLE tasks_new (
	id INTEGER PRIMARY KEY AUTOINCREMENT,
	job_id INTEGER NOT NULL,
	runner_id INTEGER,
	frame INTEGER NOT NULL,
	status TEXT NOT NULL DEFAULT 'pending',
	output_path TEXT,
	task_type TEXT NOT NULL DEFAULT 'render',
	current_step TEXT,
	retry_count INTEGER NOT NULL DEFAULT 0,
	max_retries INTEGER NOT NULL DEFAULT 3,
	runner_failure_count INTEGER NOT NULL DEFAULT 0,
	timeout_seconds INTEGER,
	condition TEXT,
	created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
	started_at TIMESTAMP,
	completed_at TIMESTAMP,
	error_message TEXT,
	FOREIGN KEY (job_id) REFERENCES jobs(id),
	FOREIGN KEY (runner_id) REFERENCES runners(id)
);
INSERT INTO tasks_new (id, job_id, runner_id, frame, status, output_path, task_type, current_step, retry_count, max_retries, runner_failure_count, timeout_seconds, condition, created_at, started_at, completed_at, error_message)
SELECT id, job_id, runner_id, frame, status, output_path, task_type, current_step, retry_count, max_retries, runner_failure_count, timeout_seconds, condition, created_at, started_at, completed_at, error_message FROM tasks;
DROP TABLE tasks;
ALTER TABLE tasks_new RENAME TO tasks;
CREATE INDEX idx_tasks_job_id ON tasks(job_id);
CREATE INDEX idx_tasks_runner_id ON tasks(runner_id);
CREATE INDEX idx_tasks_status ON tasks(status);
CREATE INDEX idx_tasks_job_status ON tasks(job_id, status);
CREATE INDEX idx_tasks_started_at ON tasks(started_at);