ALTER TABLE "custom_fields" ADD COLUMN "key" text;
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UPDATE "custom_fields"
SET "key" = trim(both '_' from regexp_replace(lower("name"), '[^a-z0-9]+', '_', 'g'));
--> statement-breakpoint
UPDATE "custom_fields" SET "key" = 'field_' || substring("id"::text, 1, 8) WHERE "key" IS NULL OR "key" = '';
--> statement-breakpoint
ALTER TABLE "custom_fields" ALTER COLUMN "key" SET NOT NULL;
--> statement-breakpoint
ALTER TABLE "custom_fields" ADD CONSTRAINT "custom_fields_key_unique" UNIQUE("key");