fix: http trigger routers cache version sequence (#5755)

* fix: http trigger routers cache version sequence

* nit

backend/migrations/20250515181903_fix_http_routers_cache.down.sql

@@ -0,0 +1 @@
+-- Add down migration script here

backend/migrations/20250515181903_fix_http_routers_cache.up.sql

@@ -0,0 +1,9 @@
+-- Add up migration script here
+-- this makes sure that the first time nextval is called, 2 is returned
+-- otherwise, `SELECT last_value from http_trigger_version_seq;` would return 1 before and after the first nextval call
+-- which would not refresh the routers cache after the first create/update/delete
+SELECT setval(                                  
+    'http_trigger_version_seq',
+    (SELECT last_value FROM http_trigger_version_seq),
+    true
+);