ALTER TABLE "Rule" ADD COLUMN "position" INTEGER NOT NULL DEFAULT 0;

WITH ordered AS (
  SELECT
    "id",
    "tenantId",
    ROW_NUMBER() OVER (PARTITION BY "tenantId" ORDER BY "createdAt" ASC, "id" ASC) - 1 AS pos
  FROM "Rule"
)
UPDATE "Rule" r
SET "position" = ordered.pos
FROM ordered
WHERE ordered.id = r.id;

CREATE INDEX "Rule_tenantId_position_idx" ON "Rule"("tenantId", "position");