BEGIN;
CREATE TABLE workspaces (
 id uuid PRIMARY KEY,
 owner_id uuid NOT NULL REFERENCES account_users(id),
 name text NOT NULL CHECK (char_length(name) BETWEEN 1 AND 40),
 purpose text NOT NULL CHECK (purpose IN ('工作与团队','个人创作','学习与研究')),
 created_at timestamptz NOT NULL DEFAULT now()
);
CREATE TABLE workspace_members (
 workspace_id uuid NOT NULL REFERENCES workspaces(id) ON DELETE CASCADE,
 user_id uuid NOT NULL REFERENCES account_users(id) ON DELETE CASCADE,
 PRIMARY KEY (workspace_id, user_id)
);
CREATE INDEX workspace_members_user ON workspace_members(user_id);
CREATE TABLE workspace_invites (
 digest text PRIMARY KEY,
 workspace_id uuid NOT NULL REFERENCES workspaces(id) ON DELETE CASCADE,
 expires_at timestamptz NOT NULL
);
CREATE INDEX workspace_invites_workspace ON workspace_invites(workspace_id);
INSERT INTO schema_migrations(version) VALUES ('018_workspaces');
COMMIT;