Add migration for modified index

bin/migrations/builder_migrations.ml

@@ -179,6 +179,7 @@ let () =
         [ f20210910 ];
         actions (module M20211105);
         actions (module M20220509);
+        actions (module M20230911);
       ])
   |> Cmd.eval
   |> exit

bin/migrations/m20230911.ml

@@ -0,0 +1,26 @@
+let new_version = 17L and old_version = 16L
+and identifier = "2023-09-11"
+and migrate_doc = "index failed builds on main binary is null"
+and rollback_doc = "index failed builds on exit code"
+
+open Grej.Syntax
+
+let migrate _datadir (module Db : Caqti_blocking.CONNECTION) =
+  let* () = Grej.check_version ~user_version:old_version (module Db) in
+  let* () =
+    Db.exec (Caqti_type.unit ->. Caqti_type.unit @@
+             "CREATE INDEX idx_build_failed ON build(job, start_d DESC, start_ps DESC) \
+             WHERE main_binary IS NULL")
+      ()
+  in
+  Db.exec (Grej.set_version new_version) ()
+
+let rollback _datadir (module Db : Caqti_blocking.CONNECTION) =
+  let* () = Grej.check_version ~user_version:new_version (module Db) in
+  let* () =
+    Db.exec (Caqti_type.unit ->. Caqti_type.unit @@
+             "CREATE INDEX idx_build_failed ON build(job, start_d DESC, start_ps DESC) \
+              WHERE result_code <> 0")
+      ()
+  in
+  Db.exec (Grej.set_version old_version) ()

db/builder_db.ml

@@ -5,7 +5,7 @@ open Caqti_request.Infix
 let application_id = 1234839235l
 
 (* Please update this when making changes! *)
-let current_version = 16L
+let current_version = 17L
 
 type 'a id = 'a Rep.id