ALTER TABLE "users" ADD COLUMN "status" text DEFAULT 'draft' NOT NULL;
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ALTER TABLE "users" ADD COLUMN "created_by" uuid;
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ALTER TABLE "users" ADD COLUMN "updated_by" uuid;
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UPDATE "users" SET "status" = 'active', "created_by" = "id", "updated_by" = "id";
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ALTER TABLE "users" ALTER COLUMN "created_by" SET NOT NULL;
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ALTER TABLE "users" ALTER COLUMN "updated_by" SET NOT NULL;
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ALTER TABLE "users" ADD CONSTRAINT "users_created_by_users_id_fk" FOREIGN KEY ("created_by") REFERENCES "public"."users"("id") ON DELETE no action ON UPDATE no action;
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ALTER TABLE "users" ADD CONSTRAINT "users_updated_by_users_id_fk" FOREIGN KEY ("updated_by") REFERENCES "public"."users"("id") ON DELETE no action ON UPDATE no action;
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ALTER TABLE "employees" ADD COLUMN "user_id" uuid;
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ALTER TABLE "employees" ADD CONSTRAINT "employees_user_id_users_id_fk" FOREIGN KEY ("user_id") REFERENCES "public"."users"("id") ON DELETE set null ON UPDATE no action;
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CREATE UNIQUE INDEX "employees_user_id_unique" ON "employees" USING btree ("user_id");