ALTER TABLE mail_identities
    ADD COLUMN reply_to_addrs JSONB NOT NULL DEFAULT '[]',
    ADD COLUMN updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW();

CREATE TABLE mail_user_labels (
    id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
    user_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    name TEXT NOT NULL,
    color TEXT NOT NULL DEFAULT '',
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    UNIQUE(user_id, name)
);

CREATE INDEX idx_mail_user_labels_user ON mail_user_labels(user_id);