-- +goose Up
-- 创建项目幂等键 + 同创建人下项目名唯一（防双击/重试重复行）。
-- 约束粒度：同一 creator_user_id 内 name 唯一（允许不同团队同名项目）。

ALTER TABLE projects
    ADD COLUMN IF NOT EXISTS client_key TEXT NULL;

COMMENT ON COLUMN projects.client_key IS
    'Optional client idempotency key; same creator+key returns the existing project.';

-- Deduplicate same-creator same-name rows before unique index (keep lowest id).
WITH dups AS (
    SELECT id,
           ROW_NUMBER() OVER (
               PARTITION BY creator_user_id, lower(trim(name))
               ORDER BY id ASC
           ) AS rn
    FROM projects
    WHERE creator_user_id IS NOT NULL
      AND creator_user_id > 0
      AND length(trim(name)) > 0
)
UPDATE projects p
SET name = p.name || ' (dup-' || p.id || ')'
FROM dups d
WHERE p.id = d.id AND d.rn > 1;

CREATE UNIQUE INDEX IF NOT EXISTS uq_projects_creator_client_key
    ON projects (creator_user_id, client_key)
    WHERE client_key IS NOT NULL AND length(trim(client_key)) > 0
      AND creator_user_id IS NOT NULL AND creator_user_id > 0;

CREATE UNIQUE INDEX IF NOT EXISTS uq_projects_creator_name
    ON projects (creator_user_id, lower(trim(name)))
    WHERE creator_user_id IS NOT NULL AND creator_user_id > 0
      AND length(trim(name)) > 0;

-- +goose Down
DROP INDEX IF EXISTS uq_projects_creator_name;
DROP INDEX IF EXISTS uq_projects_creator_client_key;
ALTER TABLE projects DROP COLUMN IF EXISTS client_key;