-- migrations/0004_tasks.sql
-- Phase 4: Tasks (Kanban)

-- +goose Up

-- ENUM declaration order must match visual left-to-right column order (Pitfall 6).
CREATE TYPE task_status AS ENUM ('todo', 'in_progress', 'in_review', 'done');

CREATE TABLE tasks (
    id          uuid        PRIMARY KEY DEFAULT gen_random_uuid(),
    tablo_id    uuid        NOT NULL REFERENCES tablos(id) ON DELETE CASCADE,
    title       text        NOT NULL,
    description text,
    status      task_status NOT NULL DEFAULT 'todo',
    position    integer     NOT NULL DEFAULT 100,
    created_at  timestamptz NOT NULL DEFAULT now(),
    updated_at  timestamptz NOT NULL DEFAULT now()
);

CREATE INDEX tasks_tablo_id_status_idx ON tasks(tablo_id, status, position);

-- +goose Down
-- Table MUST be dropped before type (Pitfall 3 — type is still referenced by table column).
DROP TABLE IF EXISTS tasks;
DROP TYPE IF EXISTS task_status;