diff --git a/scripts/sql/34604300_unique_constraint_mpc.down.sql b/scripts/sql/34604300_unique_constraint_mpc.down.sql
new file mode 100644
index 0000000000..ccde3949a6
--- /dev/null
+++ b/scripts/sql/34604300_unique_constraint_mpc.down.sql
@@ -0,0 +1,4 @@
+-- Remove the unique constraint
+DROP INDEX IF EXISTS idx_unique_manifest_push_config_app_env;
+
+
diff --git a/scripts/sql/34604300_unique_constraint_mpc.up.sql b/scripts/sql/34604300_unique_constraint_mpc.up.sql
new file mode 100644
index 0000000000..bc004ee6da
--- /dev/null
+++ b/scripts/sql/34604300_unique_constraint_mpc.up.sql
@@ -0,0 +1,6 @@
+
+-- Add unique constraint to prevent future duplicates
+-- This ensures only one active manifest_push_config per (app_id, env_id) combination
+CREATE UNIQUE INDEX IF NOT EXISTS idx_unique_manifest_push_config_app_env
+    ON manifest_push_config (app_id, env_id)
+    WHERE deleted = false;
\ No newline at end of file