traccar: use postgresql via unix socket

configuration.nix

@@ -73,6 +73,8 @@
     ./services/harmonia.nix
 
     ./services/ddns-updater.nix
+
+    ./services/traccar.nix
   ];
 
   # Hosts entries for CI/CD deploy targets

service-configs.nix

@@ -68,6 +68,10 @@ rec {
         port = 64738;
         proto = "both";
       };
+      traccar_tracking = {
+        port = 5056;
+        proto = "tcp";
+      };
     };
 
     # Ports bound to localhost / VPN only. The flake asserts none of
@@ -197,6 +201,10 @@ rec {
         port = 5500;
         proto = "tcp";
       };
+      traccar_web = {
+        port = 8082;
+        proto = "tcp";
+      };
     };
   };
 
@@ -330,6 +338,10 @@ rec {
     dataDir = services_dir + "/trilium";
   };
 
+  traccar = {
+    domain = "traccar.${https.domain}";
+  };
+
   media = {
     moviesDir = torrents_path + "/media/movies";
     tvDir = torrents_path + "/media/tv";

services/traccar.nix

@@ -0,0 +1,74 @@
+{
+  service_configs,
+  lib,
+  ...
+}:
+{
+  imports = [
+    (lib.serviceMountWithZpool "traccar" service_configs.zpool_ssds [
+      "/var/lib/traccar"
+    ])
+    (lib.serviceFilePerms "traccar" [
+      "Z /var/lib/traccar 0700 traccar traccar"
+    ])
+    (lib.mkCaddyReverseProxy {
+      subdomain = "traccar";
+      port = service_configs.ports.private.traccar_web.port;
+    })
+  ];
+
+  users.users.traccar = {
+    isSystemUser = true;
+    group = "traccar";
+    home = "/var/lib/traccar";
+    description = "Traccar GPS Tracking";
+  };
+  users.groups.traccar = { };
+
+  # PostgreSQL database (auto-created, peer auth via Unix socket)
+  services.postgresql = {
+    ensureDatabases = [ "traccar" ];
+    ensureUsers = [
+      {
+        name = "traccar";
+        ensureDBOwnership = true;
+      }
+    ];
+  };
+
+  services.traccar = {
+    enable = true;
+    settings = {
+      web.port = toString service_configs.ports.private.traccar_web.port;
+
+      # PostgreSQL via Unix socket (peer auth, junixsocket is bundled)
+      database = {
+        driver = "org.postgresql.Driver";
+        url = "jdbc:postgresql:///traccar?socketFactory=org.newsclub.net.unix.AFUNIXSocketFactory$FactoryArg&socketFactoryArg=${service_configs.postgres.socket}/.s.PGSQL.5432";
+        user = "traccar";
+        password = "";
+      };
+
+      # Only enable OsmAnd protocol (phone app). Prevents Traccar from
+      # opening 200+ default protocol ports that conflict with other services.
+      protocols.enable = "osmand";
+      osmand.port = toString service_configs.ports.public.traccar_tracking.port;
+    };
+  };
+
+  # Disable DynamicUser so we can use peer auth with PostgreSQL
+  systemd.services.traccar = {
+    after = [ "postgresql.service" ];
+    requires = [ "postgresql.service" ];
+    serviceConfig = {
+      DynamicUser = lib.mkForce false;
+      User = "traccar";
+      Group = "traccar";
+    };
+  };
+
+  # OsmAnd tracking port must be reachable from the internet for the phone app
+  networking.firewall.allowedTCPPorts = [
+    service_configs.ports.public.traccar_tracking.port
+  ];
+}