CREATE TABLE tenants (
    id          BIGSERIAL PRIMARY KEY,
    name        VARCHAR(100) NOT NULL,
    status      VARCHAR(20) NOT NULL DEFAULT 'active',
    frozen_at   TIMESTAMPTZ,
    created_at  TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    updated_at  TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    deleted_at  TIMESTAMPTZ
);
CREATE UNIQUE INDEX uk_tenant_name_active ON tenants(name) WHERE deleted_at IS NULL;