migration unique constraint on mpc

Author: prkhrkat

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;
+
+

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;