CREATE EXTENSION IF NOT EXISTS "uuid-ossp";

CREATE TYPE fang_task_state AS ENUM ('new', 'in_progress', 'failed', 'finished', 'retried');

CREATE TABLE fang_tasks (
     id uuid PRIMARY KEY DEFAULT uuid_generate_v4(),
     metadata jsonb NOT NULL,
     error_message TEXT,
     state fang_task_state DEFAULT 'new' NOT NULL,
     task_type VARCHAR DEFAULT 'common' NOT NULL,
     uniq_hash CHAR(64),
     retries INTEGER DEFAULT 0 NOT NULL,
     scheduled_at TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT NOW(),
     created_at TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT NOW(),
     updated_at TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT NOW()
);

CREATE INDEX fang_tasks_state_index ON fang_tasks(state);
CREATE INDEX fang_tasks_type_index ON fang_tasks(task_type);
CREATE INDEX fang_tasks_scheduled_at_index ON fang_tasks(scheduled_at);
CREATE INDEX fang_tasks_uniq_hash ON fang_tasks(uniq_hash);