diff --git a/.hydra/declarative-jobsets.nix b/.hydra/declarative-jobsets.nix
new file mode 100644
index 00000000..df246815
--- /dev/null
+++ b/.hydra/declarative-jobsets.nix
@@ -0,0 +1,53 @@
+{ nixpkgs, pulls, ... }:
+
+let
+  pkgs = import nixpkgs { };
+
+  prs = builtins.fromJSON (builtins.readFile pulls);
+  prJobsets = pkgs.lib.mapAttrs (num: info: {
+    enabled = 1;
+    hidden = false;
+    description = "PR ${num}: ${info.title}";
+    checkinterval = 300;
+    schedulingshares = 20;
+    enableemail = false;
+    emailoverride = "";
+    keepnr = 1;
+    type = 1;
+    flake = "gitea:git.dynamicdiscord.de/ahtlon/infrastructure/pulls/${num}";
+  }) prs;
+  mkFlakeJobset = branch: {
+    description = "Build ${branch} branch of Simple NixOS MailServer";
+    checkinterval = 300;
+    enabled = "1";
+    schedulingshares = 100;
+    enableemail = false;
+    emailoverride = "";
+    keepnr = 3;
+    hidden = false;
+    type = 1;
+    flake = "git:simple-nixos-mailserver/nixos-mailserver/${branch}";
+  };
+
+  desc = prJobsets // {
+    "master" = mkFlakeJobset "master";
+  };
+
+  log = {
+    pulls = prs;
+    jobsets = desc;
+  };
+
+in
+{
+  jobsets = pkgs.runCommand "spec-jobsets.json" { } ''
+    cat >$out <<'EOF'
+    ${builtins.toJSON desc}
+    EOF
+    # This is to get nice .jobsets build logs on Hydra
+    cat >tmp <<'EOF'
+    ${builtins.toJSON log}
+    EOF
+    ${pkgs.jq}/bin/jq . tmp
+  '';
+}
diff --git a/.hydra/spec.json b/.hydra/spec.json
new file mode 100644
index 00000000..469bb334
--- /dev/null
+++ b/.hydra/spec.json
@@ -0,0 +1,30 @@
+{
+  "enabled": 1,
+  "hidden": false,
+  "description": "Simple NixOS Mailserver",
+  "nixexprinput": "nixexpr",
+  "nixexprpath": ".hydra/declarative-jobsets.nix",
+  "checkinterval": 60,
+  "schedulingshares": 100,
+  "enableemail": false,
+  "emailoverride": "",
+  "keepnr": 3,
+  "type": 0,
+  "inputs": {
+    "nixexpr": {
+      "value": "https://git.dynamicdiscord.de/ahtlon/infrastructure master",
+      "type": "git",
+      "emailresponsible": false
+    },
+    "nixpkgs": {
+      "value": "https://github.com/NixOS/nixpkgs nixos-25.11",
+      "type": "git",
+      "emailresponsible": false
+    },
+    "pulls": {
+      "type": "path",
+      "value": "http://127.0.0.1:27364/gitea-pulls-sorted.json",
+      "emailresponsible": false
+    }
+  }
+}
diff --git a/flake.lock b/flake.lock
index 6b277103..673769c7 100644
--- a/flake.lock
+++ b/flake.lock
@@ -126,11 +126,11 @@
         "spectrum": "spectrum"
       },
       "locked": {
-        "lastModified": 1772055583,
-        "narHash": "sha256-iPIm1orqkhsxqju6EVODOrV1BmyA5HNTZ8a1o812bFM=",
+        "lastModified": 1773018425,
+        "narHash": "sha256-fpgZBmZpKoEXEowBK/6m8g9FcOLWQ4UxhXHqCw2CpSM=",
         "owner": "astro",
         "repo": "microvm.nix",
-        "rev": "f6dcfb7c16cc3775536c825dc0698d4ede13d063",
+        "rev": "25ebda3c558e923720c965832dc9a04f559a055c",
         "type": "github"
       },
       "original": {
@@ -177,11 +177,11 @@
     },
     "nixos-hardware": {
       "locked": {
-        "lastModified": 1771969195,
-        "narHash": "sha256-qwcDBtrRvJbrrnv1lf/pREQi8t2hWZxVAyeMo7/E9sw=",
+        "lastModified": 1772972630,
+        "narHash": "sha256-mUJxsNOrBMNOUJzN0pfdVJ1r2pxeqm9gI/yIKXzVVbk=",
         "owner": "NixOS",
         "repo": "nixos-hardware",
-        "rev": "41c6b421bdc301b2624486e11905c9af7b8ec68e",
+        "rev": "3966ce987e1a9a164205ac8259a5fe8a64528f72",
         "type": "github"
       },
       "original": {
@@ -209,11 +209,11 @@
     },
     "nixpkgs-unstable": {
       "locked": {
-        "lastModified": 1771848320,
-        "narHash": "sha256-0MAd+0mun3K/Ns8JATeHT1sX28faLII5hVLq0L3BdZU=",
+        "lastModified": 1772963539,
+        "narHash": "sha256-9jVDGZnvCckTGdYT53d/EfznygLskyLQXYwJLKMPsZs=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "2fc6539b481e1d2569f25f8799236694180c0993",
+        "rev": "9dcb002ca1690658be4a04645215baea8b95f31d",
         "type": "github"
       },
       "original": {
@@ -225,11 +225,11 @@
     },
     "nixpkgs_2": {
       "locked": {
-        "lastModified": 1771903837,
-        "narHash": "sha256-sdaqdnsQCv3iifzxwB22tUwN/fSHoN7j2myFW5EIkGk=",
+        "lastModified": 1773068389,
+        "narHash": "sha256-vMrm7Pk2hjBRPnCSjhq1pH0bg350Z+pXhqZ9ICiqqCs=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "e764fc9a405871f1f6ca3d1394fb422e0a0c3951",
+        "rev": "44bae273f9f82d480273bab26f5c50de3724f52f",
         "type": "github"
       },
       "original": {
@@ -264,11 +264,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1772048434,
-        "narHash": "sha256-/wA0OaH6kZ/pFA+nXR/tvg5oupOmEDmMS5us79JT60o=",
+        "lastModified": 1773096132,
+        "narHash": "sha256-M3zEnq9OElB7zqc+mjgPlByPm1O5t2fbUrH3t/Hm5Ag=",
         "owner": "Mic92",
         "repo": "sops-nix",
-        "rev": "334daa7c273dd8bf7a0cd370e4e16022b64e55e9",
+        "rev": "d1ff3b1034d5bab5d7d8086a7803c5a5968cd784",
         "type": "github"
       },
       "original": {
@@ -280,11 +280,11 @@
     "spectrum": {
       "flake": false,
       "locked": {
-        "lastModified": 1759482047,
-        "narHash": "sha256-H1wiXRQHxxPyMMlP39ce3ROKCwI5/tUn36P8x6dFiiQ=",
+        "lastModified": 1772189877,
+        "narHash": "sha256-i1p90Rgssb//aNiTDFq46ZG/fk3LmyRLChtp/9lddyA=",
         "ref": "refs/heads/main",
-        "rev": "c5d5786d3dc938af0b279c542d1e43bce381b4b9",
-        "revCount": 996,
+        "rev": "fe39e122d898f66e89ffa17d4f4209989ccb5358",
+        "revCount": 1255,
         "type": "git",
         "url": "https://spectrum-os.org/git/spectrum"
       },