diff --git a/db/builder_db.ml b/db/builder_db.ml
index 10f0dab..7acb787 100644
--- a/db/builder_db.ml
+++ b/db/builder_db.ml
@@ -317,29 +317,14 @@ module Build = struct
 
   let get_all_failed =
     Caqti_request.collect
-      Caqti_type.(tup2 int int)
+      Caqti_type.(tup3 int int (option string))
       (Caqti_type.tup2 Caqti_type.string t)
       {| SELECT job.name, b.uuid, b.start_d, b.start_ps, b.finish_d, b.finish_ps,
            b.result_code, b.result_msg, b.console, b.script, b.platform,
            b.main_binary, b.input_id, b.user, b.job
          FROM build b
          INNER JOIN job ON job.id = b.job
-         WHERE b.result_code <> 0
-         ORDER BY start_d DESC, start_ps DESC
-         LIMIT $2
-         OFFSET $1
-      |}
-
-  let get_all_failed_by_platform =
-    Caqti_request.collect
-      Caqti_type.(tup3 int int string)
-      (Caqti_type.tup2 Caqti_type.string t)
-      {| SELECT job.name, b.id, b.uuid, b.start_d, b.start_ps, b.finish_d, b.finish_ps,
-           b.result_code, b.result_msg, b.console, b.script, b.platform,
-           b.main_binary, b.input_id, b.user, b.job
-         FROM build b
-         INNER JOIN job ON job.id = b.job
-         WHERE b.result_code <> 0 AND b.platform = $3
+         WHERE b.result_code <> 0 AND ($3 IS NULL OR b.platform = $3)
          ORDER BY start_d DESC, start_ps DESC
          LIMIT $2
          OFFSET $1
@@ -347,45 +332,25 @@ module Build = struct
 
   let get_all_artifact_sha =
     Caqti_request.collect
-      (id `job)
+      Caqti_type.(tup2 (id `job) (option string))
       Rep.cstruct
       {| SELECT DISTINCT a.sha256
          FROM build_artifact a, build b
-         WHERE b.job = ? AND b.main_binary = a.id
-         ORDER BY b.start_d DESC, b.start_ps DESC
-      |}
-
-  let get_all_artifact_sha_by_platform =
-    Caqti_request.collect
-      Caqti_type.(tup2 (id `job) string)
-      Rep.cstruct
-      {| SELECT DISTINCT a.sha256
-         FROM build_artifact a, build b
-         WHERE b.job = ? AND b.platform = ? AND b.main_binary = a.id
+         WHERE b.job = $1 AND b.main_binary = a.id
+           AND ($2 IS NULL OR b.platform = $2)
          ORDER BY b.start_d DESC, b.start_ps DESC
       |}
 
   let get_failed_builds =
     Caqti_request.collect
-      (id `job)
+      Caqti_type.(tup2 (id `job) (option string))
       t
       {| SELECT uuid, start_d, start_ps, finish_d, finish_ps,
                 result_code, result_msg, console, script,
                 platform, main_binary, input_id, user, job
          FROM build
-         WHERE job = ? AND result_code <> 0
-         ORDER BY start_d DESC, start_ps DESC
-      |}
-
-  let get_failed_builds_by_platform =
-    Caqti_request.collect
-      Caqti_type.(tup2 (id `job) string)
-      t
-      {| SELECT uuid, start_d, start_ps, finish_d, finish_ps,
-                result_code, result_msg, console, script,
-                platform, main_binary, input_id, user, job
-         FROM build
-         WHERE job = ? AND platform = ? AND result_code <> 0
+         WHERE job = $1 AND result_code <> 0
+           AND ($2 IS NULL OR platform = $2)
          ORDER BY start_d DESC, start_ps DESC
       |}
 
@@ -411,33 +376,19 @@ module Build = struct
 
   let get_latest_successful =
     Caqti_request.find_opt
-      (id `job)
+      Caqti_type.(tup2 (id `job) (option string))
       t
       {| SELECT
            b.uuid, b.start_d, b.start_ps, b.finish_d, b.finish_ps,
            b.result_code, b.result_msg, b.console, b.script,
            b.platform, b.main_binary, b.input_id, b.user, b.job
          FROM build b
-         WHERE b.job = ? AND b.result_code = 0
+         WHERE b.job = $1 AND b.result_code = 0
+           AND ($2 IS NULL OR b.platform = $2)
          ORDER BY b.start_d DESC, b.start_ps DESC
          LIMIT 1
       |}
 
-  let get_latest_successful_by_platform =
-    Caqti_request.find_opt
-      Caqti_type.(tup2 (id `job) string)
-      t
-      {| SELECT
-           b.uuid, b.start_d, b.start_ps, b.finish_d, b.finish_ps,
-           b.result_code, b.result_msg, b.console, b.script,
-           b.platform, b.main_binary, b.input_id, b.user, b.job
-         FROM build b
-         WHERE b.job = $1 AND b.result_code = 0 AND b.platform = $2
-         ORDER BY b.start_d DESC, b.start_ps DESC
-         LIMIT 1
-      |}
-
-
   let get_previous_successful_different_output =
     Caqti_request.find_opt
       (id `build)
diff --git a/db/builder_db.mli b/db/builder_db.mli
index 34c46e8..b25d5a0 100644
--- a/db/builder_db.mli
+++ b/db/builder_db.mli
@@ -114,25 +114,16 @@ sig
   val get_all :
     ([`job] id, [`build] id * t, [ `Many | `One | `Zero ]) Caqti_request.t
   val get_all_failed :
-    (int * int, string * t, [ `Many | `One | `Zero ]) Caqti_request.t
-  val get_all_failed_by_platform :
-    (int * int * string, string * t, [ `Many | `One | `Zero ]) Caqti_request.t
+    (int * int * string option, string * t, [ `Many | `One | `Zero ]) Caqti_request.t
   val get_all_artifact_sha :
-    ([`job] id, Cstruct.t, [ `Many | `One | `Zero ]) Caqti_request.t
-  val get_all_artifact_sha_by_platform :
-    ([`job] id * string, Cstruct.t, [ `Many | `One | `Zero ]) Caqti_request.t
+    ([`job] id * string option, Cstruct.t, [ `Many | `One | `Zero ]) Caqti_request.t
   val get_latest_successful_with_binary :
     ([`job] id * string, [`build] id * t * file option, [< `Many | `One | `Zero > `One `Zero ])
       Caqti_request.t
   val get_failed_builds :
-    ([`job] id, t, [ `Many | `One | `Zero ]) Caqti_request.t
-  val get_failed_builds_by_platform :
-    ([`job] id * string, t, [ `Many | `One | `Zero ]) Caqti_request.t
+    ([`job] id * string option, t, [ `Many | `One | `Zero ]) Caqti_request.t
   val get_latest_successful :
-    ([`job] id, t, [< `Many | `One | `Zero > `One `Zero ])
-      Caqti_request.t
-  val get_latest_successful_by_platform :
-    ([`job] id * string, t, [< `Many | `One | `Zero > `One `Zero ])
+    ([`job] id * string option, t, [< `Many | `One | `Zero > `One `Zero ])
       Caqti_request.t
   val get_previous_successful_different_output :
     ([`build] id, t, [< `Many | `One | `Zero > `One `Zero ])
diff --git a/lib/model.ml b/lib/model.ml
index 956c30b..78db10a 100644
--- a/lib/model.ml
+++ b/lib/model.ml
@@ -69,11 +69,7 @@ let build_exists uuid (module Db : CONN) =
   Option.is_some
 
 let latest_successful_build job_id platform (module Db : CONN) =
-  match platform with
-  | None ->
-    Db.find_opt Builder_db.Build.get_latest_successful job_id
-  | Some platform ->
-    Db.find_opt Builder_db.Build.get_latest_successful_by_platform (job_id, platform)
+  Db.find_opt Builder_db.Build.get_latest_successful (job_id, platform)
 
 let latest_successful_build_uuid job_id platform db =
   latest_successful_build job_id platform db >|= fun build ->
@@ -86,9 +82,7 @@ let next_successful_build_different_output id (module Db : CONN) =
   Db.find_opt Builder_db.Build.get_next_successful_different_output id
 
 let failed_builds ~start ~count platform (module Db : CONN) =
-  match platform with
-  | None -> Db.collect_list Builder_db.Build.get_all_failed (start, count)
-  | Some p -> Db.collect_list Builder_db.Build.get_all_failed_by_platform (start, count, p)
+  Db.collect_list Builder_db.Build.get_all_failed (start, count, platform)
 
 let builds_with_different_input_and_same_main_binary id (module Db : CONN) =
   Db.collect_list Builder_db.Build.get_different_input_same_output_input_ids id >>= fun ids ->
@@ -136,10 +130,7 @@ let job_and_readme job (module Db : CONN) =
   job_id, readme
 
 let builds_grouped_by_output job_id platform (module Db : CONN) =
-  (match platform with
-   | None -> Db.collect_list Builder_db.Build.get_all_artifact_sha job_id
-   | Some p -> Db.collect_list Builder_db.Build.get_all_artifact_sha_by_platform (job_id, p))
-  >>= fun sha ->
+  Db.collect_list Builder_db.Build.get_all_artifact_sha (job_id, platform) >>= fun sha ->
   Lwt_list.fold_left_s (fun acc hash ->
     match acc with
     | Error _ as e -> Lwt.return e
@@ -150,10 +141,7 @@ let builds_grouped_by_output job_id platform (module Db : CONN) =
 
 let builds_grouped_by_output_with_failed job_id platform ((module Db : CONN) as db) =
   builds_grouped_by_output job_id platform db >>= fun builds ->
-  (match platform with
-   | None -> Db.collect_list Builder_db.Build.get_failed_builds job_id
-   | Some p -> Db.collect_list Builder_db.Build.get_failed_builds_by_platform (job_id, p))
-  >|= fun failed ->
+  Db.collect_list Builder_db.Build.get_failed_builds (job_id, platform) >|= fun failed ->
   let failed = List.map (fun b -> b, None) failed in
   let cmp (a, _) (b, _) = Ptime.compare b.Builder_db.Build.start a.Builder_db.Build.start in
   List.merge cmp builds failed