diff --git a/db/builder_db.ml b/db/builder_db.ml
index facc93b..226f2b9 100644
--- a/db/builder_db.ml
+++ b/db/builder_db.ml
@@ -177,7 +177,7 @@ module Build_artifact = struct
   let add =
     Caqti_type.(tup2 file (id `build)) ->. Caqti_type.unit @@
     "INSERT INTO build_artifact (filepath, sha256, size, build) \
-     VALUES (?, ?, ?, ?, ?)"
+     VALUES (?, ?, ?, ?)"
 
   let remove_by_build =
     id `build ->. Caqti_type.unit @@
diff --git a/test/test_builder_db.ml b/test/test_builder_db.ml
index ce2d257..8e5ccfd 100644
--- a/test/test_builder_db.ml
+++ b/test/test_builder_db.ml
@@ -43,18 +43,15 @@ module Testable = struct
   let file =
     let equal (x : Builder_db.Rep.file) (y : Builder_db.Rep.file) =
       Fpath.equal x.filepath y.filepath &&
-      Fpath.equal x.localpath y.localpath &&
       Cstruct.equal x.sha256 y.sha256 &&
       x.size = y.size
     in
-    let pp ppf { Builder_db.Rep.filepath; localpath; sha256; size } =
+    let pp ppf { Builder_db.Rep.filepath; sha256; size } =
       Format.fprintf ppf "{@[<v 1>@;<1 0>Builder_db.Rep.filepath = %a;@;<1 0>\
-                          localpath = %a;@;<1 0>\
                           sha256 = %a;@;<1 0>\
                           size = %d;@;<1 0>\
                           @]@,}"
-        Fpath.pp filepath Fpath.pp localpath
-        Cstruct.hexdump_pp sha256 size
+        Fpath.pp filepath Cstruct.hexdump_pp sha256 size
     in
     Alcotest.testable pp equal
 
@@ -133,11 +130,10 @@ let finish = Option.get (Ptime.of_float_s 1.)
 let result = Builder.Exited 0
 let main_binary =
   let filepath = Result.get_ok (Fpath.of_string "bin/hello.sh") in
-  let localpath = Result.get_ok (Fpath.of_string "/dev/null") in
   let data = "#!/bin/sh\necho Hello, World\n" in
   let sha256 = Mirage_crypto.Hash.SHA256.digest (Cstruct.of_string data) in
   let size = String.length data in
-  { Builder_db.Rep.filepath; localpath; sha256; size }
+  { Builder_db.Rep.filepath; sha256; size }
 let main_binary2 =
   let data = "#!/bin/sh\necho Hello, World 2\n" in
   let sha256 = Mirage_crypto.Hash.SHA256.digest (Cstruct.of_string data) in
@@ -162,8 +158,16 @@ let add_test_build user_id (module Db : CONN) =
     Db.exec Build.set_main_binary (id, main_binary_id) >>= fun () ->
     Db.commit ()
   in
-  Result.fold ~ok:Result.ok ~error:(fun _ -> Db.rollback ())
-    r
+  Result.fold r
+    ~ok:Result.ok
+    ~error:(fun e ->
+        let () =
+          match e with
+          | `Msg e -> Printf.eprintf "%s\n%!" e
+          | #Caqti_error.t as e ->
+            Fmt.epr "%a" Caqti_error.pp e
+        in
+        Db.rollback ())
 
 let with_build_db f () =
   or_fail
@@ -269,6 +273,14 @@ let test_artifact_get_by_build_uuid (module Db : CONN) =
   get_opt "no build" >>| fun (_id, file) ->
   Alcotest.(check Testable.file) "same file" file main_binary
 
+let test_artifact_exists_true (module Db : CONN) =
+  Db.find Builder_db.Build_artifact.exists main_binary.sha256 >>| fun exists ->
+  Alcotest.(check bool) "main binary exists" true exists
+
+let test_artifact_exists_false (module Db : CONN) =
+  Db.find Builder_db.Build_artifact.exists main_binary2.sha256 >>| fun exists ->
+  Alcotest.(check bool) "main binary2 doesn't exists" false exists
+
 (* XXX: This test should fail because main_binary on the corresponding build
  * references its main_binary. This is not the case now due to foreign key. *)
 let test_artifact_remove_by_build (module Db : CONN) =
@@ -306,6 +318,8 @@ let () =
     "build-artifact", [
       test_case "Get all by build" `Quick (with_build_db test_artifact_get_all_by_build);
       test_case "Get by build uuid" `Quick (with_build_db test_artifact_get_by_build_uuid);
+      test_case "Artifact exists" `Quick (with_build_db test_artifact_exists_true);
+      test_case "Other artifact doesn't exists" `Quick (with_build_db test_artifact_exists_false);
       test_case "Remove by build" `Quick (with_build_db test_artifact_remove_by_build);
     ];
   ]