improvement: new prosthesis type data structure implemented and finally working!

backend/prisma/migrations/20260901130000_lab_case_task_per_tooth/migration.sql

@@ -0,0 +1,12 @@
+-- One LabCaseTask pipeline per tooth: unique must include tooth.
+ALTER TABLE "lab_case_tasks" ADD COLUMN IF NOT EXISTS "tooth" TEXT NOT NULL DEFAULT '';
+
+UPDATE "lab_case_tasks"
+SET "tooth" = COALESCE("teeth"->>0, '')
+WHERE "tooth" = '';
+
+ALTER TABLE "lab_case_tasks" DROP CONSTRAINT IF EXISTS "lab_case_tasks_case_source_prosthesis_step_key";
+DROP INDEX IF EXISTS "lab_case_tasks_case_source_prosthesis_step_key";
+
+CREATE UNIQUE INDEX IF NOT EXISTS "lab_case_tasks_case_source_tooth_prosthesis_step_key"
+  ON "lab_case_tasks"("labCaseId", "sourceKey", "tooth", "prosthesisTypeCode", "stepOrder");