diff --git a/pgpm/constructive-infra-seed/deploy/schemas/constructive_store_private/tables/platform_secrets/fixtures/standalone_compat.sql b/pgpm/constructive-infra-seed/deploy/schemas/constructive_store_private/tables/platform_secrets/fixtures/standalone_compat.sql
new file mode 100644
index 0000000..18b706b
--- /dev/null
+++ b/pgpm/constructive-infra-seed/deploy/schemas/constructive_store_private/tables/platform_secrets/fixtures/standalone_compat.sql
@@ -0,0 +1,31 @@
+-- Deploy: schemas/constructive_store_private/tables/platform_secrets/fixtures/standalone_compat
+-- made with <3 @ constructive.io
+--
+-- Standalone compatibility patch for platform_secrets.
+--
+-- In the monolith, database_id is set by provisioning triggers and the unique
+-- constraint evolves across migrations. The slicer extracts the final table
+-- state (UNIQUE on database_id, namespace_id, name) but the functions were
+-- generated for the earlier schema (UNIQUE on namespace_id, name only).
+--
+-- This patch bridges the gap for standalone mode:
+--   1. DEFAULT on database_id → filled from jwt_private.current_database_id()
+--      so INSERT without explicit database_id still populates it.
+--   2. Unique index on (namespace_id, name) → matches the ON CONFLICT clause
+--      in the generated platform_secrets_set() function.
+--
+-- Safe for standalone (single database_id). The upstream AST builders will
+-- eventually generate entity-aware functions that include database_id directly.
+
+BEGIN;
+
+-- 1. Set DEFAULT on database_id so INSERTs without it use the JWT claim
+ALTER TABLE constructive_store_private.platform_secrets
+  ALTER COLUMN database_id SET DEFAULT jwt_private.current_database_id();
+
+-- 2. Create unique index matching the ON CONFLICT (namespace_id, name) clause
+--    in the generated platform_secrets_set/del functions
+CREATE UNIQUE INDEX IF NOT EXISTS platform_secrets_namespace_id_name_idx
+  ON constructive_store_private.platform_secrets (namespace_id, name);
+
+COMMIT;
diff --git a/pgpm/constructive-infra-seed/pgpm.plan b/pgpm/constructive-infra-seed/pgpm.plan
index 7ec9bd3..c5e05a9 100644
--- a/pgpm/constructive-infra-seed/pgpm.plan
+++ b/pgpm/constructive-infra-seed/pgpm.plan
@@ -5,3 +5,4 @@
 schemas/constructive_infra_public/partitions/create_default_partitions 2017-08-11T08:11:51Z Constructive <developers@constructive.io> # create default partitions for range-partitioned tables
 schemas/constructive_infra_public/tables/platform_namespaces/fixtures/seed_default_namespace [schemas/constructive_infra_public/partitions/create_default_partitions] 2017-08-11T08:11:51Z Constructive <developers@constructive.io> # seed default platform namespace
 schemas/constructive_infra_public/tables/platform_function_definitions/fixtures/seed_built_in_functions [schemas/constructive_infra_public/tables/platform_namespaces/fixtures/seed_default_namespace] 2017-08-11T08:11:51Z Constructive <developers@constructive.io> # seed built-in platform functions with required_secrets and namespace
+schemas/constructive_store_private/tables/platform_secrets/fixtures/standalone_compat [schemas/constructive_infra_public/tables/platform_namespaces/fixtures/seed_default_namespace] 2017-08-11T08:11:51Z Constructive <developers@constructive.io> # standalone compat: DEFAULT database_id from JWT + unique index for ON CONFLICT
diff --git a/pgpm/constructive-infra-seed/revert/schemas/constructive_store_private/tables/platform_secrets/fixtures/standalone_compat.sql b/pgpm/constructive-infra-seed/revert/schemas/constructive_store_private/tables/platform_secrets/fixtures/standalone_compat.sql
new file mode 100644
index 0000000..80f73e4
--- /dev/null
+++ b/pgpm/constructive-infra-seed/revert/schemas/constructive_store_private/tables/platform_secrets/fixtures/standalone_compat.sql
@@ -0,0 +1,11 @@
+-- Revert: schemas/constructive_store_private/tables/platform_secrets/fixtures/standalone_compat
+-- made with <3 @ constructive.io
+
+BEGIN;
+
+DROP INDEX IF EXISTS constructive_store_private.platform_secrets_namespace_id_name_idx;
+
+ALTER TABLE constructive_store_private.platform_secrets
+  ALTER COLUMN database_id DROP DEFAULT;
+
+COMMIT;
diff --git a/pgpm/constructive-infra-seed/verify/schemas/constructive_store_private/tables/platform_secrets/fixtures/standalone_compat.sql b/pgpm/constructive-infra-seed/verify/schemas/constructive_store_private/tables/platform_secrets/fixtures/standalone_compat.sql
new file mode 100644
index 0000000..6aa1b65
--- /dev/null
+++ b/pgpm/constructive-infra-seed/verify/schemas/constructive_store_private/tables/platform_secrets/fixtures/standalone_compat.sql
@@ -0,0 +1,11 @@
+-- Verify: schemas/constructive_store_private/tables/platform_secrets/fixtures/standalone_compat
+-- made with <3 @ constructive.io
+
+BEGIN;
+
+SELECT 1 FROM pg_catalog.pg_indexes
+WHERE schemaname = 'constructive_store_private'
+  AND tablename = 'platform_secrets'
+  AND indexname = 'platform_secrets_namespace_id_name_idx';
+
+ROLLBACK;
diff --git a/scripts/setup-platform-db.sh b/scripts/setup-platform-db.sh
index 029283d..0141e23 100755
--- a/scripts/setup-platform-db.sh
+++ b/scripts/setup-platform-db.sh
@@ -36,7 +36,7 @@ echo "→ Deploying constructive-infra..."
 cd "$ROOT_DIR/pgpm"
 pgpm deploy --yes --database "$DB_NAME" --package constructive-infra
 
-# --- Deploy constructive-infra-seed (built-in function definitions) ---
+# --- Deploy constructive-infra-seed (built-in function definitions + compat patches) ---
 echo "→ Deploying constructive-infra-seed..."
 pgpm deploy --yes --database "$DB_NAME" --package constructive-infra-seed