diff --git a/config/hosts/seras/configuration.nix b/config/hosts/seras/configuration.nix
index 9d4b4af..b4e062b 100644
--- a/config/hosts/seras/configuration.nix
+++ b/config/hosts/seras/configuration.nix
@@ -21,6 +21,26 @@
     ];
   };
 
+  services.postgresql.settings = {
+    max_connections = 200;
+    shared_buffers = "24GB";
+    effective_cache_size = "72GB";
+    maintenance_work_mem = "2GB";
+    checkpoint_completion_target = 0.9;
+    wal_buffers = "16MB";
+    default_statistics_target = 100;
+    random_page_cost = 1.1;
+    effective_io_concurrency = 200;
+    work_mem = "31457kB";
+    huge_pages = "try";
+    min_wal_size = "1GB";
+    max_wal_size = "4GB";
+    max_worker_processes = 32;
+    max_parallel_workers_per_gather = 4;
+    max_parallel_workers = 32;
+    max_parallel_maintenance_workers = 4;
+  };
+
   kyouma.ooklaserver = {
     enable = true;
     openFirewall = true;
diff --git a/config/services/hydra/default.nix b/config/services/hydra/default.nix
index 5073636..404be76 100644
--- a/config/services/hydra/default.nix
+++ b/config/services/hydra/default.nix
@@ -32,7 +32,7 @@
       binary_cache_public_uri = https://cache.kyouma.net
       evaluator_workers = 8
       evaluator_max_memory_size = 16384
-      max_output_size = 4294967296
+      max_output_size = ${builtins.toString (24 * 1024 * 1024 * 1024)}
     '';
   };
   services.harmonia = {
diff --git a/flake.lock b/flake.lock
index eb0e562..a0be3e4 100644
--- a/flake.lock
+++ b/flake.lock
@@ -155,11 +155,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1729099656,
-        "narHash": "sha256-VftVIg7UXTy1bq+tzi1aVYOWl7PQ35IpjW88yMYjjpc=",
+        "lastModified": 1729281548,
+        "narHash": "sha256-MuojlSnwAJAwfhgmW8ZtZrwm2Sko4fqubCvReqbUzYw=",
         "owner": "nix-community",
         "repo": "disko",
-        "rev": "d7d57edb72e54891fa67a6f058a46b2bb405663b",
+        "rev": "a6a3179ddf396dfc28a078e2f169354d0c137125",
         "type": "github"
       },
       "original": {
@@ -462,11 +462,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1728778939,
-        "narHash": "sha256-WybK5E3hpGxtCYtBwpRj1E9JoiVxe+8kX83snTNaFHE=",
+        "lastModified": 1729104314,
+        "narHash": "sha256-pZRZsq5oCdJt3upZIU4aslS9XwFJ+/nVtALHIciX/BI=",
         "owner": "cachix",
         "repo": "git-hooks.nix",
-        "rev": "ff68f91754be6f3427e4986d7949e6273659be1d",
+        "rev": "3c3e88f0f544d6bb54329832616af7eb971b6be6",
         "type": "github"
       },
       "original": {
@@ -521,11 +521,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1729174520,
-        "narHash": "sha256-QxCAdgQdeIOaCiE0Sr23s9lD0+T1b/wuz5pSiGwNrCQ=",
+        "lastModified": 1729260213,
+        "narHash": "sha256-jAvHoU/1y/yCuXzr2fNF+q6uKmr8Jj2xgAisK4QB9to=",
         "owner": "nix-community",
         "repo": "home-manager",
-        "rev": "e78cbb20276f09c1802e62d2f77fc93ec32da268",
+        "rev": "09a0c0c02953318bf94425738c7061ffdc4cba75",
         "type": "github"
       },
       "original": {
@@ -543,15 +543,17 @@
         "nixpkgs": "nixpkgs_2"
       },
       "locked": {
-        "lastModified": 1728321752,
-        "narHash": "sha256-GbBAoBF7ZObz0IP+g0LZKxMafpMvNKjTEu9haiZbV54=",
-        "ref": "refs/heads/main",
-        "rev": "ee1234c15cdcb427dbd4828e0add09d02cd606c9",
-        "revCount": 4220,
+        "lastModified": 1728215710,
+        "narHash": "sha256-TRxR6zELQoUDPhLkmBU8QjgskNyVcblKgQIxhuOyNRc=",
+        "ref": "main",
+        "rev": "799441dcf6d595efb0def686ca0815aef398627b",
+        "revCount": 4217,
         "type": "git",
         "url": "https://git.lix.systems/lix-project/hydra"
       },
       "original": {
+        "ref": "main",
+        "rev": "799441dcf6d595efb0def686ca0815aef398627b",
         "type": "git",
         "url": "https://git.lix.systems/lix-project/hydra"
       }
@@ -842,11 +844,11 @@
     },
     "nixpkgs_2": {
       "locked": {
-        "lastModified": 1728193676,
-        "narHash": "sha256-PbDWAIjKJdlVg+qQRhzdSor04bAPApDqIv2DofTyynk=",
+        "lastModified": 1725001927,
+        "narHash": "sha256-eV+63gK0Mp7ygCR0Oy4yIYSNcum2VQwnZamHxYTNi+M=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "ecbc1ca8ffd6aea8372ad16be9ebbb39889e55b6",
+        "rev": "6e99f2a27d600612004fbd2c3282d614bfee6421",
         "type": "github"
       },
       "original": {
@@ -874,11 +876,11 @@
     },
     "nixpkgs_4": {
       "locked": {
-        "lastModified": 1728888510,
-        "narHash": "sha256-nsNdSldaAyu6PE3YUA+YQLqUDJh+gRbBooMMekZJwvI=",
+        "lastModified": 1729070438,
+        "narHash": "sha256-KOTTUfPkugH52avUvXGxvWy8ibKKj4genodIYUED+Kc=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "a3c0b3b21515f74fd2665903d4ce6bc4dc81c77c",
+        "rev": "5785b6bb5eaae44e627d541023034e1601455827",
         "type": "github"
       },
       "original": {
@@ -905,11 +907,11 @@
         "treefmt-nix": "treefmt-nix_2"
       },
       "locked": {
-        "lastModified": 1729196897,
-        "narHash": "sha256-xftdQl0kxWJZNWCDSl0pU2E7zCmGjhD/N9ZWgPXK0A0=",
+        "lastModified": 1729301771,
+        "narHash": "sha256-XBnrpP7a9oYOGiqHXoXRthRBVZbhhEZPE/6YVLqIrAU=",
         "owner": "nix-community",
         "repo": "nixvim",
-        "rev": "3c7b6ae5d1524c691a1b65f7290facd0dc296e40",
+        "rev": "6a8124ca7bc97e753f89da43b82bbc83d1125a32",
         "type": "github"
       },
       "original": {
@@ -1171,11 +1173,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1727984844,
-        "narHash": "sha256-xpRqITAoD8rHlXQafYZOLvUXCF6cnZkPfoq67ThN0Hc=",
+        "lastModified": 1729242555,
+        "narHash": "sha256-6jWSWxv2crIXmYSEb3LEVsFkCkyVHNllk61X4uhqfCs=",
         "owner": "numtide",
         "repo": "treefmt-nix",
-        "rev": "4446c7a6fc0775df028c5a3f6727945ba8400e64",
+        "rev": "d986489c1c757f6921a48c1439f19bfb9b8ecab5",
         "type": "github"
       },
       "original": {
diff --git a/flake.nix b/flake.nix
index 9a54db8..54cc1fa 100644
--- a/flake.nix
+++ b/flake.nix
@@ -26,7 +26,7 @@
       inputs.nixpkgs.follows = "nixpkgs";
     };
     hydra = {
-      url = "git+https://git.lix.systems/lix-project/hydra";
+      url = "git+https://git.lix.systems/lix-project/hydra?ref=main&rev=799441dcf6d595efb0def686ca0815aef398627b";
       inputs.lix.follows = "lix";
     };
     iceshrimp = {
diff --git a/pkgs/build-worker-oci/default.nix b/pkgs/build-worker-oci/default.nix
index e458d57..4701811 100644
--- a/pkgs/build-worker-oci/default.nix
+++ b/pkgs/build-worker-oci/default.nix
@@ -34,8 +34,8 @@ dockerTools.buildLayeredImage {
     trusted-public-keys = cache.kyouma.net:Frjwu4q1rnwE/MnSTmX9yx86GNA/z3p/oElGvucLiZg= cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY=
     max-substitution-jobs = 20
     max-silent-time = 14400
-    min-free = 17179869184
-    max-free = 34359738368
+    min-free = ${builtins.toString (49152 * 1024 * 1024)}
+    max-free = ${builtins.toString (65536 * 1024 * 1024)}
     system-features = benchmark big-parallel kvm nixos-test uid-range gccarch-x86-64 gccarch-x86-64-v2 gccarch-x86-64-v3
     EOF