diff --git a/apps/backend/prisma/migrations/20260624000000_add_is_available_as_preview_project/migration.sql b/apps/backend/prisma/migrations/20260624000000_add_is_available_as_preview_project/migration.sql
index d08532f27..0fb8df170 100644
--- a/apps/backend/prisma/migrations/20260624000000_add_is_available_as_preview_project/migration.sql
+++ b/apps/backend/prisma/migrations/20260624000000_add_is_available_as_preview_project/migration.sql
@@ -1,8 +1,14 @@
-ALTER TABLE "Project"
-ADD COLUMN "isAvailableAsPreviewProject" BOOLEAN NOT NULL DEFAULT false;
+-- SPLIT_STATEMENT_SENTINEL
+-- SINGLE_STATEMENT_SENTINEL
+-- RUN_OUTSIDE_TRANSACTION_SENTINEL
+ALTER TABLE /* SCHEMA_NAME_SENTINEL */."Project"
+ADD COLUMN IF NOT EXISTS "isAvailableAsPreviewProject" BOOLEAN NOT NULL DEFAULT false;
 
 -- Partial index for fast pool claiming: only indexes the (tiny) subset of rows
 -- that are currently available, ordered by creation time so the oldest is claimed first.
-CREATE INDEX "Project_isAvailableAsPreviewProject_createdAt_idx"
-ON "Project" ("createdAt" ASC)
+-- SPLIT_STATEMENT_SENTINEL
+-- SINGLE_STATEMENT_SENTINEL
+-- RUN_OUTSIDE_TRANSACTION_SENTINEL
+CREATE INDEX CONCURRENTLY IF NOT EXISTS "Project_isAvailableAsPreviewProject_createdAt_idx"
+ON /* SCHEMA_NAME_SENTINEL */."Project" ("createdAt" ASC)
 WHERE "isAvailableAsPreviewProject" = true;