jellyfin: restartTriggers on webhook plugin so install runs at activation

The jellyfin-webhook-install oneshot has 'wantedBy = jellyfin.service',
which only runs it when jellyfin (re)starts. On first rollout to a host
where jellyfin is already running, the unit gets added but never fires,
leaving the Webhook plugin files absent -- jellyfin-webhook-configure
then gets 404 from /Plugins/$GUID/Configuration and deploy-rs rolls back.

Pinning jellyfin.restartTriggers to the plugin package + install script
forces a restart whenever either derivation changes, which pulls install
in via the existing before/wantedBy chain.

configuration.nix

@@ -133,8 +133,10 @@
   boot.kernel.sysctl."vm.nr_hugepages" = service_configs.hugepages_2m.total_pages;
 
   boot = {
-    # 6.12 LTS until 2026
+    # 6.12 LTS until 2027-03. Kernel 6.18 causes a reproducible ZFS deadlock
-    kernelPackages = pkgs.linuxPackages_6_12_hardened;
+    # in dbuf_evict due to page allocator changes (__free_frozen_pages).
+    # https://github.com/openzfs/zfs/issues/18426
+    kernelPackages = pkgs.linuxPackages_6_12;
 
     loader = {
       # Use the systemd-boot EFI boot loader.

flake.lock

@@ -27,16 +27,17 @@
     },
     "arr-init": {
       "inputs": {
+        "flake-utils": "flake-utils",
         "nixpkgs": [
           "nixpkgs"
         ]
       },
       "locked": {
-        "lastModified": 1774681523,
+        "lastModified": 1776401121,
-        "narHash": "sha256-K49RohIwbgzVeOdStfVDO83qy5K5ZLKWk4EsHJKj/k4=",
+        "narHash": "sha256-BELV1YMBuLL0aQNQ3SLvSLq8YN5h2o1jcrwz1+Zt32Q=",
         "ref": "refs/heads/main",
-        "rev": "f8475f6cb4d4d4df99002d07cf9583fb33b87876",
+        "rev": "6dde2a3e0d087208b8084b61113707c5533c4c2d",
-        "revCount": 11,
+        "revCount": 19,
         "type": "git",
         "url": "ssh://gitea@git.gardling.com/titaniumtown/arr-init"
       },
@@ -193,7 +194,25 @@
     },
     "flake-utils": {
       "inputs": {
-        "systems": "systems_5"
+        "systems": "systems_2"
+      },
+      "locked": {
+        "lastModified": 1731533236,
+        "narHash": "sha256-l0KFg5HjrsfsO/JpG+r7fRrqm12kzFHyUHqHCVpMMbI=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "11707dc2f618dd54ca8739b309ec4fc024de578b",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "flake-utils_2": {
+      "inputs": {
+        "systems": "systems_6"
       },
       "locked": {
         "lastModified": 1731533236,
@@ -304,11 +323,11 @@
         "rust-overlay": "rust-overlay"
       },
       "locked": {
-        "lastModified": 1775866084,
+        "lastModified": 1776248416,
-        "narHash": "sha256-mWn8D/oXXAaqeFFFRorKHvTLw5V9M8eYzAWRr4iffag=",
+        "narHash": "sha256-TC6yzbCAex1pDfqUZv9u8fVm8e17ft5fNrcZ0JRDOIQ=",
         "owner": "nix-community",
         "repo": "lanzaboote",
-        "rev": "29d2cca7fc3841708c1d48e2d1272f79db1538b6",
+        "rev": "18e9e64bae15b828c092658335599122a6db939b",
         "type": "github"
       },
       "original": {
@@ -325,11 +344,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1775754125,
+        "lastModified": 1776301820,
-        "narHash": "sha256-4udYhEvii0xPmRiKXYWLhPakPDd1mJppnEFY6uWdv8s=",
+        "narHash": "sha256-Yr3JRZ05PNmX4sR2Ak7e0jT+oCQgTAAML7FUoyTmitk=",
         "owner": "TheTom",
         "repo": "llama-cpp-turboquant",
-        "rev": "8590cbff961dbaf1d3a9793fd11d402e248869b9",
+        "rev": "1073622985bb68075472474b4b0fdfcdabcfc9d0",
         "type": "github"
       },
       "original": {
@@ -365,14 +384,14 @@
         "nixpkgs": [
           "nixpkgs"
         ],
-        "systems": "systems_3"
+        "systems": "systems_4"
       },
       "locked": {
-        "lastModified": 1775791757,
+        "lastModified": 1776310483,
-        "narHash": "sha256-3BS1Hw+3A3uf4G/8zwts3ZgxSnYq0y+QntbwO+b6KEw=",
+        "narHash": "sha256-xMFl+umxGmo5VEgcZcXT5Dk9sXU5WyTRz1Olpywr/60=",
         "owner": "Infinidoge",
         "repo": "nix-minecraft",
-        "rev": "c4c6a33affcc15cde3df06083e96cda87f9a7627",
+        "rev": "74abd91054e2655d6c392428a27e5d27edd5e6bf",
         "type": "github"
       },
       "original": {
@@ -399,11 +418,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1775811116,
+        "lastModified": 1776221942,
-        "narHash": "sha256-t+HZK42pB6N+i5RGbuy7Xluez/VvWbembBdvzsc23Ss=",
+        "narHash": "sha256-FbQAeVNi7G4v3QCSThrSAAvzQTmrmyDLiHNPvTF2qFM=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "54170c54449ea4d6725efd30d719c5e505f1c10e",
+        "rev": "1766437c5509f444c1b15331e82b8b6a9b967000",
         "type": "github"
       },
       "original": {
@@ -503,7 +522,7 @@
         "nixpkgs": [
           "nixpkgs"
         ],
-        "systems": "systems_4"
+        "systems": "systems_5"
       },
       "locked": {
         "lastModified": 1771989937,
@@ -624,11 +643,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1775896579,
+        "lastModified": 1776306894,
-        "narHash": "sha256-uU9t4oqG7MbJHYjYnEPfnOcSMBPxK4wACeaOXvE0Ezg=",
+        "narHash": "sha256-l4N3O1cfXiQCHJGspAkg6WlZyOFBTbLXhi8Anf8jB0g=",
         "owner": "nix-community",
         "repo": "srvos",
-        "rev": "7983ea7a44f40fcc1c35b0ca8e54e794a26b09e2",
+        "rev": "01d98209264c78cb323b636d7ab3fe8e7a8b60c7",
         "type": "github"
       },
       "original": {
@@ -712,14 +731,29 @@
         "type": "github"
       }
     },
+    "systems_6": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    },
     "trackerlist": {
       "flake": false,
       "locked": {
-        "lastModified": 1775858976,
+        "lastModified": 1776290985,
-        "narHash": "sha256-LJ+A/x7g3jhS7R9Jkyt3E4Be2jo/bJVStDDJLG5AL7c=",
+        "narHash": "sha256-eNWDOLBA0vk1TiKqse71siIAgLycjvBFDw35eAtnUPs=",
         "owner": "ngosang",
         "repo": "trackerslist",
-        "rev": "b4dac394ef1eff0ab51c0cb7004c05826988d846",
+        "rev": "9bb380b3c2a641a3289f92dedef97016f2e47f36",
         "type": "github"
       },
       "original": {
@@ -730,7 +764,7 @@
     },
     "utils": {
       "inputs": {
-        "systems": "systems_2"
+        "systems": "systems_3"
       },
       "locked": {
         "lastModified": 1731533236,
@@ -779,7 +813,7 @@
     },
     "ytbn-graphing-software": {
       "inputs": {
-        "flake-utils": "flake-utils",
+        "flake-utils": "flake-utils_2",
         "nixpkgs": "nixpkgs_3",
         "rust-overlay": "rust-overlay_2"
       },

modules/hardware.nix

@@ -12,7 +12,7 @@ let
     parent=''${1%%[0-9]*}
     dev="/sys/block/$parent"
     [ -d "$dev/queue/iosched" ] || exit 0
-    echo 15000 > "$dev/queue/iosched/read_expire"
+    echo 500 > "$dev/queue/iosched/read_expire"
     echo 15000 > "$dev/queue/iosched/write_expire"
     echo 128 > "$dev/queue/iosched/fifo_batch"
     echo 16 > "$dev/queue/iosched/writes_starved"
@@ -36,11 +36,17 @@ in
   hardware.cpu.amd.updateMicrocode = true;
   hardware.enableRedistributableFirmware = true;
 
-  # HDD I/O tuning for torrent seeding workload (high-concurrency random reads).
+  # HDD I/O tuning for torrent seeding workload (high-concurrency random reads)
+  # sharing the pool with latency-sensitive sequential reads (Jellyfin playback).
   #
   # mq-deadline sorts requests into elevator sweeps, reducing seek distance.
-  # Aggressive deadlines (15s) let the scheduler accumulate more ops before dispatching,
+  # read_expire=500ms keeps reads bounded so a Jellyfin segment can't queue for
-  # maximizing coalescence — latency is irrelevant since torrent peers tolerate 30-60s.
+  # seconds behind a torrent burst; write_expire=15s lets the scheduler batch
+  # writes for coalescence (torrent writes are async and tolerate delay).
+  # The bulk of read coalescence already happens above the scheduler via ZFS
+  # aggregation (zfs_vdev_aggregation_limit=4M, read_gap_limit=128K,
+  # async_read_max=32), so the scheduler deadline only needs to be large enough
+  # to keep the elevator sweep coherent -- 500ms is plenty on rotational disks.
   # fifo_batch=128 keeps sweeps long; writes_starved=16 heavily favors reads.
   # 4 MiB readahead matches libtorrent piece extent affinity for sequential prefetch.
   #

modules/security.nix

@@ -13,12 +13,89 @@
   # disable coredumps
   systemd.coredump.enable = false;
 
-  # The hardened kernel defaults kernel.unprivileged_userns_clone to 0, which
+  # Needed for Nix sandbox UID/GID mapping inside derivation builds.
-  # prevents the Nix sandbox from mapping UIDs/GIDs. Without this, any derivation
+  # See https://github.com/NixOS/nixpkgs/issues/287194
-  # that calls `id` in its build phase (e.g. logrotate checkPhase) fails when not
-  # served from the binary cache. See https://github.com/NixOS/nixpkgs/issues/287194
   security.unprivilegedUsernsClone = true;
 
+  # Disable kexec to prevent replacing the running kernel at runtime.
+  security.protectKernelImage = true;
+
+  # Kernel hardening boot parameters. These recover most of the runtime-
+  # configurable protections that the linux-hardened patchset provided.
+  boot.kernelParams = [
+    # Zero all page allocator pages on free / alloc. Prevents info leaks
+    # and use-after-free from seeing stale data. Modest CPU overhead.
+    "init_on_alloc=1"
+    "init_on_free=1"
+
+    # Prevent SLUB allocator from merging caches with similar size/flags.
+    # Keeps different kernel object types in separate slabs, making heap
+    # exploitation (type confusion, spray, use-after-free) significantly harder.
+    "slab_nomerge"
+
+    # Randomize order of pages returned by the buddy allocator.
+    "page_alloc.shuffle=1"
+
+    # Disable debugfs entirely (exposes kernel internals).
+    "debugfs=off"
+
+    # Disable legacy vsyscall emulation (unused by any modern glibc).
+    "vsyscall=none"
+
+    # Strict IOMMU TLB invalidation (no batching). Prevents DMA-capable
+    # devices from accessing stale mappings after unmap.
+    "iommu.strict=1"
+  ];
+
+  boot.kernel.sysctl = {
+    # Immediately reboot on kernel oops (don't leave a compromised
+    # kernel running). Negative value = reboot without delay.
+    "kernel.panic" = -1;
+
+    # Hide kernel pointers from all processes, including CAP_SYSLOG.
+    # Prevents info leaks used to defeat KASLR.
+    "kernel.kptr_restrict" = 2;
+
+    # Disable bpf() JIT compiler (eliminates JIT spray attack vector).
+    "net.core.bpf_jit_enable" = false;
+
+    # Disable ftrace (kernel function tracer) at runtime.
+    "kernel.ftrace_enabled" = false;
+
+    # Strict reverse-path filtering: drop packets arriving on an interface
+    # where the source address isn't routable back via that interface.
+    "net.ipv4.conf.all.rp_filter" = 1;
+    "net.ipv4.conf.default.rp_filter" = 1;
+    "net.ipv4.conf.all.log_martians" = true;
+    "net.ipv4.conf.default.log_martians" = true;
+
+    # Ignore ICMP redirects (prevents route table poisoning).
+    "net.ipv4.conf.all.accept_redirects" = false;
+    "net.ipv4.conf.all.secure_redirects" = false;
+    "net.ipv4.conf.default.accept_redirects" = false;
+    "net.ipv4.conf.default.secure_redirects" = false;
+    "net.ipv6.conf.all.accept_redirects" = false;
+    "net.ipv6.conf.default.accept_redirects" = false;
+
+    # Don't send ICMP redirects (we are not a router).
+    "net.ipv4.conf.all.send_redirects" = false;
+    "net.ipv4.conf.default.send_redirects" = false;
+
+    # Ignore broadcast ICMP (SMURF amplification mitigation).
+    "net.ipv4.icmp_echo_ignore_broadcasts" = true;
+
+    # Filesystem hardening: prevent hardlink/symlink-based attacks.
+    # protected_hardlinks/symlinks: block unprivileged creation of hard/symlinks
+    # to files the user doesn't own (prevents TOCTOU privilege escalation).
+    # protected_fifos/regular (level 2): restrict opening FIFOs and regular files
+    # in world-writable sticky directories to owner/group match only.
+    # Also required for systemd-tmpfiles to chmod hardlinked files.
+    "fs.protected_hardlinks" = true;
+    "fs.protected_symlinks" = true;
+    "fs.protected_fifos" = 2;
+    "fs.protected_regular" = 2;
+  };
+
   services = {
     dbus.implementation = "broker";
     /*

modules/zfs.nix

@@ -1,15 +1,39 @@
 {
   config,
+  lib,
   service_configs,
   pkgs,
   ...
 }:
+let
+  # Total RAM in bytes (from /proc/meminfo: 65775836 KiB).
+  totalRamBytes = 65775836 * 1024;
+
+  # Hugepage reservations that the kernel carves out before ZFS can use them.
+  hugepages2mBytes = service_configs.hugepages_2m.total_pages * 2 * 1024 * 1024;
+  hugepages1gBytes = 3 * 1024 * 1024 * 1024; # 3x 1G pages for RandomX (xmrig.nix)
+  totalHugepageBytes = hugepages2mBytes + hugepages1gBytes;
+
+  # ARC max: 60% of RAM remaining after hugepages. Leaves headroom for
+  # application RSS (PostgreSQL, qBittorrent, Jellyfin, Grafana, etc.),
+  # kernel slabs, and page cache.
+  arcMaxBytes = (totalRamBytes - totalHugepageBytes) * 60 / 100;
+in
 {
-  boot.zfs.package = pkgs.zfs;
+  boot.zfs.package = pkgs.zfs_2_4;
   boot.initrd.kernelModules = [ "zfs" ];
 
   boot.kernelParams = [
-    "zfs.zfs_txg_timeout=120" # longer TXG open time = larger sequential writes
+    # 120s TXG timeout: batch more dirty data per transaction group so the
+    # HDD pool (hdds) writes larger, sequential I/Os instead of many small syncs.
+    # This is a global setting (no per-pool control); the SSD pool (tank) syncs
+    # infrequently but handles it fine since SSDs don't suffer from seek overhead.
+    "zfs.zfs_txg_timeout=120"
+
+    # Cap ARC to prevent it from claiming memory reserved for hugepages.
+    # Without this, ZFS auto-sizes c_max to ~62 GiB on a 64 GiB system,
+    # ignoring the 11.5 GiB of hugepage reservations.
+    "zfs.zfs_arc_max=${toString arcMaxBytes}"
 
     # vdev I/O scheduler: feed more concurrent reads to the block scheduler so
     # mq-deadline has a larger pool of requests to sort and merge into elevator sweeps.

patches/nixpkgs/0002-jellyfin-add-declarative-network-xml-options.patch

@@ -0,0 +1,443 @@
+From f0582558f0a8b0ef543b3251c4a07afab89fde63 Mon Sep 17 00:00:00 2001
+From: Simon Gardling <titaniumtown@proton.me>
+Date: Fri, 17 Apr 2026 19:37:11 -0400
+Subject: [PATCH] nixos/jellyfin: add declarative network.xml options
+
+Adds services.jellyfin.network.* (baseUrl, ports, IPv4/6, LAN subnets,
+known proxies, remote IP filter, etc.) and services.jellyfin.forceNetworkConfig,
+mirroring the existing hardwareAcceleration / forceEncodingConfig pattern.
+
+Motivation: running Jellyfin behind a reverse proxy requires configuring
+KnownProxies (so the real client IP is extracted from X-Forwarded-For)
+and LocalNetworkSubnets (so LAN clients are correctly classified and not
+subject to RemoteClientBitrateLimit). These settings previously had no
+declarative option -- they could only be set via the web dashboard or
+by hand-editing network.xml, with no guarantee they would survive a
+reinstall or be consistent across deployments.
+
+Implementation:
+- Adds a networkXmlText template alongside the existing encodingXmlText.
+- Factors the force-vs-soft install logic out of preStart into a
+  small 'manage_config_xml' shell helper; encoding.xml and network.xml
+  now share the same install/backup semantics.
+- Extends the VM test with a machineWithNetworkConfig node and a
+  subtest that verifies the declared values land in network.xml,
+  Jellyfin parses them at startup, and the backup-on-overwrite path
+  works (same shape as the existing 'Force encoding config' subtest).
+---
+ nixos/modules/services/misc/jellyfin.nix | 303 ++++++++++++++++++++---
+ nixos/tests/jellyfin.nix                 |  50 ++++
+ 2 files changed, 317 insertions(+), 36 deletions(-)
+
+diff --git a/nixos/modules/services/misc/jellyfin.nix b/nixos/modules/services/misc/jellyfin.nix
+index 5c08fc478e45..387da907c652 100644
+--- a/nixos/modules/services/misc/jellyfin.nix
++++ b/nixos/modules/services/misc/jellyfin.nix
+@@ -26,8 +26,10 @@ let
+     bool
+     enum
+     ints
++    listOf
+     nullOr
+     path
++    port
+     str
+     submodule
+     ;
+@@ -68,6 +70,41 @@ let
+     </EncodingOptions>
+   '';
+   encodingXmlFile = pkgs.writeText "encoding.xml" encodingXmlText;
++  stringListToXml =
++    tag: items:
++    if items == [ ] then
++      "<${tag} />"
++    else
++      "<${tag}>\n    ${
++        concatMapStringsSep "\n    " (item: "<string>${escapeXML item}</string>") items
++      }\n  </${tag}>";
++  networkXmlText = ''
++    <?xml version="1.0" encoding="utf-8"?>
++    <NetworkConfiguration xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
++      <BaseUrl>${escapeXML cfg.network.baseUrl}</BaseUrl>
++      <EnableHttps>${boolToString cfg.network.enableHttps}</EnableHttps>
++      <RequireHttps>${boolToString cfg.network.requireHttps}</RequireHttps>
++      <InternalHttpPort>${toString cfg.network.internalHttpPort}</InternalHttpPort>
++      <InternalHttpsPort>${toString cfg.network.internalHttpsPort}</InternalHttpsPort>
++      <PublicHttpPort>${toString cfg.network.publicHttpPort}</PublicHttpPort>
++      <PublicHttpsPort>${toString cfg.network.publicHttpsPort}</PublicHttpsPort>
++      <AutoDiscovery>${boolToString cfg.network.autoDiscovery}</AutoDiscovery>
++      <EnableUPnP>${boolToString cfg.network.enableUPnP}</EnableUPnP>
++      <EnableIPv4>${boolToString cfg.network.enableIPv4}</EnableIPv4>
++      <EnableIPv6>${boolToString cfg.network.enableIPv6}</EnableIPv6>
++      <EnableRemoteAccess>${boolToString cfg.network.enableRemoteAccess}</EnableRemoteAccess>
++      ${stringListToXml "LocalNetworkSubnets" cfg.network.localNetworkSubnets}
++      ${stringListToXml "LocalNetworkAddresses" cfg.network.localNetworkAddresses}
++      ${stringListToXml "KnownProxies" cfg.network.knownProxies}
++      <IgnoreVirtualInterfaces>${boolToString cfg.network.ignoreVirtualInterfaces}</IgnoreVirtualInterfaces>
++      ${stringListToXml "VirtualInterfaceNames" cfg.network.virtualInterfaceNames}
++      <EnablePublishedServerUriByRequest>${boolToString cfg.network.enablePublishedServerUriByRequest}</EnablePublishedServerUriByRequest>
++      ${stringListToXml "PublishedServerUriBySubnet" cfg.network.publishedServerUriBySubnet}
++      ${stringListToXml "RemoteIPFilter" cfg.network.remoteIPFilter}
++      <IsRemoteIPFilterBlacklist>${boolToString cfg.network.isRemoteIPFilterBlacklist}</IsRemoteIPFilterBlacklist>
++    </NetworkConfiguration>
++  '';
++  networkXmlFile = pkgs.writeText "network.xml" networkXmlText;
+   codecListToType =
+     desc: list:
+     submodule {
+@@ -205,6 +242,196 @@ in
+         '';
+       };
+ 
++      network = {
++        baseUrl = mkOption {
++          type = str;
++          default = "";
++          example = "/jellyfin";
++          description = ''
++            Prefix added to Jellyfin's internal URLs when it sits behind a reverse proxy at a sub-path.
++            Leave empty when Jellyfin is served at the root of its host.
++          '';
++        };
++
++        enableHttps = mkOption {
++          type = bool;
++          default = false;
++          description = ''
++            Serve HTTPS directly from Jellyfin. Usually unnecessary when terminating TLS in a reverse proxy.
++          '';
++        };
++
++        requireHttps = mkOption {
++          type = bool;
++          default = false;
++          description = ''
++            Redirect plaintext HTTP requests to HTTPS. Only meaningful when {option}`enableHttps` is true.
++          '';
++        };
++
++        internalHttpPort = mkOption {
++          type = port;
++          default = 8096;
++          description = "TCP port Jellyfin binds for HTTP.";
++        };
++
++        internalHttpsPort = mkOption {
++          type = port;
++          default = 8920;
++          description = "TCP port Jellyfin binds for HTTPS. Only used when {option}`enableHttps` is true.";
++        };
++
++        publicHttpPort = mkOption {
++          type = port;
++          default = 8096;
++          description = "HTTP port Jellyfin advertises in server discovery responses and published URIs.";
++        };
++
++        publicHttpsPort = mkOption {
++          type = port;
++          default = 8920;
++          description = "HTTPS port Jellyfin advertises in server discovery responses and published URIs.";
++        };
++
++        autoDiscovery = mkOption {
++          type = bool;
++          default = true;
++          description = "Respond to LAN client auto-discovery broadcasts (UDP 7359).";
++        };
++
++        enableUPnP = mkOption {
++          type = bool;
++          default = false;
++          description = "Attempt to open the public ports on the router via UPnP.";
++        };
++
++        enableIPv4 = mkOption {
++          type = bool;
++          default = true;
++          description = "Listen on IPv4.";
++        };
++
++        enableIPv6 = mkOption {
++          type = bool;
++          default = true;
++          description = "Listen on IPv6.";
++        };
++
++        enableRemoteAccess = mkOption {
++          type = bool;
++          default = true;
++          description = ''
++            Allow connections from clients outside the subnets listed in {option}`localNetworkSubnets`.
++            When false, Jellyfin rejects non-local requests regardless of reverse proxy configuration.
++          '';
++        };
++
++        localNetworkSubnets = mkOption {
++          type = listOf str;
++          default = [ ];
++          example = [
++            "192.168.1.0/24"
++            "10.0.0.0/8"
++          ];
++          description = ''
++            CIDR ranges (or bare IPs) that Jellyfin classifies as the local network.
++            Clients originating from these ranges -- as seen after {option}`knownProxies` X-Forwarded-For
++            unwrapping -- are not subject to {option}`services.jellyfin` remote-client bitrate limits.
++          '';
++        };
++
++        localNetworkAddresses = mkOption {
++          type = listOf str;
++          default = [ ];
++          example = [ "192.168.1.50" ];
++          description = ''
++            Specific interface addresses Jellyfin binds to. Leave empty to bind all interfaces.
++          '';
++        };
++
++        knownProxies = mkOption {
++          type = listOf str;
++          default = [ ];
++          example = [ "127.0.0.1" ];
++          description = ''
++            Addresses of reverse proxies trusted to forward the real client IP via `X-Forwarded-For`.
++            Without this, Jellyfin sees the proxy's address for every request and cannot apply
++            {option}`localNetworkSubnets` classification to the true client.
++          '';
++        };
++
++        ignoreVirtualInterfaces = mkOption {
++          type = bool;
++          default = true;
++          description = "Skip virtual network interfaces (matching {option}`virtualInterfaceNames`) during auto-bind.";
++        };
++
++        virtualInterfaceNames = mkOption {
++          type = listOf str;
++          default = [ "veth" ];
++          description = "Interface name prefixes treated as virtual when {option}`ignoreVirtualInterfaces` is true.";
++        };
++
++        enablePublishedServerUriByRequest = mkOption {
++          type = bool;
++          default = false;
++          description = ''
++            Derive the server's public URI from the incoming request's Host header instead of any
++            configured {option}`publishedServerUriBySubnet` entry.
++          '';
++        };
++
++        publishedServerUriBySubnet = mkOption {
++          type = listOf str;
++          default = [ ];
++          example = [ "192.168.1.0/24=http://jellyfin.lan:8096" ];
++          description = ''
++            Per-subnet overrides for the URI Jellyfin advertises to clients, in `subnet=uri` form.
++          '';
++        };
++
++        remoteIPFilter = mkOption {
++          type = listOf str;
++          default = [ ];
++          example = [ "203.0.113.0/24" ];
++          description = ''
++            IPs or CIDRs used as the allow- or denylist for remote access.
++            Behaviour is controlled by {option}`isRemoteIPFilterBlacklist`.
++          '';
++        };
++
++        isRemoteIPFilterBlacklist = mkOption {
++          type = bool;
++          default = false;
++          description = ''
++            When true, {option}`remoteIPFilter` is a denylist; when false, it is an allowlist
++            (and an empty list allows all remote addresses).
++          '';
++        };
++      };
++
++      forceNetworkConfig = mkOption {
++        type = bool;
++        default = false;
++        description = ''
++          Whether to overwrite Jellyfin's `network.xml` configuration file on each service start.
++
++          When enabled, the network configuration specified in {option}`services.jellyfin.network`
++          is applied on every service restart. A backup of the existing `network.xml` will be
++          created at `network.xml.backup-$timestamp`.
++
++          ::: {.warning}
++          Enabling this option means that any changes made to networking settings through
++          Jellyfin's web dashboard will be lost on the next service restart. The NixOS configuration
++          becomes the single source of truth for network settings.
++          :::
++
++          When disabled (the default), the network configuration is only written if no `network.xml`
++          exists yet. This allows settings to be changed through Jellyfin's web dashboard and persist
++          across restarts, but means the NixOS configuration options will be ignored after the initial setup.
++        '';
++      };
++
+       transcoding = {
+         maxConcurrentStreams = mkOption {
+           type = nullOr ints.positive;
+@@ -384,46 +611,50 @@ in
+         wants = [ "network-online.target" ];
+         wantedBy = [ "multi-user.target" ];
+ 
+-        preStart = mkIf cfg.hardwareAcceleration.enable (
+-          ''
+-            configDir=${escapeShellArg cfg.configDir}
+-            encodingXml="$configDir/encoding.xml"
+-          ''
+-          + (
+-            if cfg.forceEncodingConfig then
+-              ''
+-                if [[ -e $encodingXml ]]; then
++        preStart =
++          let
++            # manage_config_xml <source> <destination> <force> <description>
++            #
++            # Installs a NixOS-declared XML config at <destination>, preserving
++            # any existing file as a timestamped backup when <force> is true.
++            # With <force>=false, leaves existing files untouched and warns if
++            # the on-disk content differs from the declared content.
++            helper = ''
++              manage_config_xml() {
++                local src="$1" dest="$2" force="$3" desc="$4"
++                if [[ -e "$dest" ]]; then
+                   # this intentionally removes trailing newlines
+-                  currentText="$(<"$encodingXml")"
+-                  configuredText="$(<${encodingXmlFile})"
+-                  if [[ $currentText == "$configuredText" ]]; then
+-                    # don't need to do anything
+-                    exit 0
+-                  else
+-                    encodingXmlBackup="$configDir/encoding.xml.backup-$(date -u +"%FT%H_%M_%SZ")"
+-                    mv --update=none-fail -T "$encodingXml" "$encodingXmlBackup"
++                  local currentText configuredText
++                  currentText="$(<"$dest")"
++                  configuredText="$(<"$src")"
++                  if [[ "$currentText" == "$configuredText" ]]; then
++                    return 0
+                   fi
+-                fi
+-                cp --update=none-fail -T ${encodingXmlFile} "$encodingXml"
+-                chmod u+w "$encodingXml"
+-              ''
+-            else
+-              ''
+-                if [[ -e $encodingXml ]]; then
+-                  # this intentionally removes trailing newlines
+-                  currentText="$(<"$encodingXml")"
+-                  configuredText="$(<${encodingXmlFile})"
+-                  if [[ $currentText != "$configuredText" ]]; then
+-                    echo "WARN: $encodingXml already exists and is different from the configured settings. transcoding options NOT applied." >&2
+-                    echo "WARN: Set config.services.jellyfin.forceEncodingConfig = true to override." >&2
++                  if [[ "$force" == true ]]; then
++                    local backup
++                    backup="$dest.backup-$(date -u +"%FT%H_%M_%SZ")"
++                    mv --update=none-fail -T "$dest" "$backup"
++                  else
++                    echo "WARN: $dest already exists and is different from the configured settings. $desc options NOT applied." >&2
++                    echo "WARN: Set the corresponding force*Config option to override." >&2
++                    return 0
+                   fi
+-                else
+-                  cp --update=none-fail -T ${encodingXmlFile} "$encodingXml"
+-                  chmod u+w "$encodingXml"
+                 fi
+-              ''
+-          )
+-        );
++                cp --update=none-fail -T "$src" "$dest"
++                chmod u+w "$dest"
++              }
++              configDir=${escapeShellArg cfg.configDir}
++            '';
++          in
++          (
++            helper
++            + optionalString cfg.hardwareAcceleration.enable ''
++              manage_config_xml ${encodingXmlFile} "$configDir/encoding.xml" ${boolToString cfg.forceEncodingConfig} transcoding
++            ''
++            + ''
++              manage_config_xml ${networkXmlFile} "$configDir/network.xml" ${boolToString cfg.forceNetworkConfig} network
++            ''
++          );
+ 
+         # This is mostly follows: https://github.com/jellyfin/jellyfin/blob/master/fedora/jellyfin.service
+         # Upstream also disable some hardenings when running in LXC, we do the same with the isContainer option
+diff --git a/nixos/tests/jellyfin.nix b/nixos/tests/jellyfin.nix
+index 4896c13d4eca..0c9191960f78 100644
+--- a/nixos/tests/jellyfin.nix
++++ b/nixos/tests/jellyfin.nix
+@@ -63,6 +63,26 @@
+       environment.systemPackages = with pkgs; [ ffmpeg ];
+       virtualisation.diskSize = 3 * 1024;
+     };
++
++    machineWithNetworkConfig = {
++      services.jellyfin = {
++        enable = true;
++        forceNetworkConfig = true;
++        network = {
++          localNetworkSubnets = [
++            "192.168.1.0/24"
++            "10.0.0.0/8"
++          ];
++          knownProxies = [ "127.0.0.1" ];
++          enableUPnP = false;
++          enableIPv6 = false;
++          remoteIPFilter = [ "203.0.113.5" ];
++          isRemoteIPFilterBlacklist = true;
++        };
++      };
++      environment.systemPackages = with pkgs; [ ffmpeg ];
++      virtualisation.diskSize = 3 * 1024;
++    };
+   };
+ 
+   # Documentation of the Jellyfin API: https://api.jellyfin.org/
+@@ -122,6 +142,36 @@
+           # Verify the new encoding.xml does not have the marker (was overwritten)
+           machineWithForceConfig.fail("grep -q 'MARKER' /var/lib/jellyfin/config/encoding.xml")
+ 
++      # Test forceNetworkConfig and network.xml generation
++      with subtest("Force network config writes declared values and backs up on overwrite"):
++          wait_for_jellyfin(machineWithNetworkConfig)
++
++          # Verify network.xml exists and contains the declared values
++          machineWithNetworkConfig.succeed("test -f /var/lib/jellyfin/config/network.xml")
++          machineWithNetworkConfig.succeed("grep -F '<string>192.168.1.0/24</string>' /var/lib/jellyfin/config/network.xml")
++          machineWithNetworkConfig.succeed("grep -F '<string>10.0.0.0/8</string>' /var/lib/jellyfin/config/network.xml")
++          machineWithNetworkConfig.succeed("grep -F '<string>127.0.0.1</string>' /var/lib/jellyfin/config/network.xml")
++          machineWithNetworkConfig.succeed("grep -F '<string>203.0.113.5</string>' /var/lib/jellyfin/config/network.xml")
++          machineWithNetworkConfig.succeed("grep -F '<IsRemoteIPFilterBlacklist>true</IsRemoteIPFilterBlacklist>' /var/lib/jellyfin/config/network.xml")
++          machineWithNetworkConfig.succeed("grep -F '<EnableIPv6>false</EnableIPv6>' /var/lib/jellyfin/config/network.xml")
++          machineWithNetworkConfig.succeed("grep -F '<EnableUPnP>false</EnableUPnP>' /var/lib/jellyfin/config/network.xml")
++
++          # Stop service before modifying config
++          machineWithNetworkConfig.succeed("systemctl stop jellyfin.service")
++
++          # Plant a marker so we can prove the backup-and-overwrite path runs
++          machineWithNetworkConfig.succeed("echo '<!-- NETMARKER -->' > /var/lib/jellyfin/config/network.xml")
++
++          # Restart the service to trigger the backup
++          machineWithNetworkConfig.succeed("systemctl restart jellyfin.service")
++          wait_for_jellyfin(machineWithNetworkConfig)
++
++          # Verify the marked content was preserved as a timestamped backup
++          machineWithNetworkConfig.succeed("grep -q 'NETMARKER' /var/lib/jellyfin/config/network.xml.backup-*")
++
++          # Verify the new network.xml does not have the marker (was overwritten)
++          machineWithNetworkConfig.fail("grep -q 'NETMARKER' /var/lib/jellyfin/config/network.xml")
++
+       auth_header = 'MediaBrowser Client="NixOS Integration Tests", DeviceId="1337", Device="Apple II", Version="20.09"'
+ 
+ 
+-- 
+2.53.0
+

service-configs.nix

@@ -81,6 +81,12 @@ rec {
         port = 6011;
         proto = "tcp";
       };
+      # Webhook receiver for the Jellyfin-qBittorrent monitor — Jellyfin pushes
+      # playback events here so throttling reacts without waiting for the poll.
+      jellyfin_qbittorrent_monitor_webhook = {
+        port = 9898;
+        proto = "tcp";
+      };
       bitmagnet = {
         port = 3333;
         proto = "tcp";

services/arr/init.nix

@@ -8,13 +8,26 @@
       dataDir = service_configs.prowlarr.dataDir;
       apiVersion = "v1";
       networkNamespacePath = "/run/netns/wg";
+      networkNamespaceService = "wg";
+      # Guarantee critical config.xml elements before startup. Prowlarr has a
+      # history of losing <Port> from config.xml, causing the service to run
+      # without binding any socket. See arr-init's configXml for details.
+      configXml = {
+        Port = service_configs.ports.private.prowlarr.port;
+        BindAddress = "*";
+        EnableSsl = false;
+      };
+      # Prowlarr runs in the wg netns; Sonarr/Radarr in the host netns.
+      # From host netns, Prowlarr is reachable at the wg namespace address,
+      # not at localhost (which resolves to the host's own netns).
+      # Health checks can now run — the reverse-connect is reachable.
       healthChecks = true;
       syncedApps = [
         {
           name = "Sonarr";
           implementation = "Sonarr";
           configContract = "SonarrSettings";
-          prowlarrUrl = "http://localhost:${builtins.toString service_configs.ports.private.prowlarr.port}";
+          prowlarrUrl = "http://${config.vpnNamespaces.wg.namespaceAddress}:${builtins.toString service_configs.ports.private.prowlarr.port}";
           baseUrl = "http://${config.vpnNamespaces.wg.bridgeAddress}:${builtins.toString service_configs.ports.private.sonarr.port}";
           apiKeyFrom = "${service_configs.sonarr.dataDir}/config.xml";
           serviceName = "sonarr";
@@ -23,7 +36,7 @@
           name = "Radarr";
           implementation = "Radarr";
           configContract = "RadarrSettings";
-          prowlarrUrl = "http://localhost:${builtins.toString service_configs.ports.private.prowlarr.port}";
+          prowlarrUrl = "http://${config.vpnNamespaces.wg.namespaceAddress}:${builtins.toString service_configs.ports.private.prowlarr.port}";
           baseUrl = "http://${config.vpnNamespaces.wg.bridgeAddress}:${builtins.toString service_configs.ports.private.radarr.port}";
           apiKeyFrom = "${service_configs.radarr.dataDir}/config.xml";
           serviceName = "radarr";
@@ -37,6 +50,11 @@
       port = service_configs.ports.private.sonarr.port;
       dataDir = service_configs.sonarr.dataDir;
       healthChecks = true;
+      configXml = {
+        Port = service_configs.ports.private.sonarr.port;
+        BindAddress = "*";
+        EnableSsl = false;
+      };
       rootFolders = [ service_configs.media.tvDir ];
       naming = {
         renameEpisodes = true;
@@ -69,6 +87,11 @@
       port = service_configs.ports.private.radarr.port;
       dataDir = service_configs.radarr.dataDir;
       healthChecks = true;
+      configXml = {
+        Port = service_configs.ports.private.radarr.port;
+        BindAddress = "*";
+        EnableSsl = false;
+      };
       rootFolders = [ service_configs.media.moviesDir ];
       naming = {
         renameMovies = true;
@@ -110,4 +133,21 @@
       serviceName = "radarr";
     };
   };
+
+  services.jellyseerrInit = {
+    enable = true;
+    configDir = service_configs.jellyseerr.configDir;
+    radarr = {
+      profileName = "Remux + WEB 2160p";
+      dataDir = service_configs.radarr.dataDir;
+      port = service_configs.ports.private.radarr.port;
+      serviceName = "radarr";
+    };
+    sonarr = {
+      profileName = "WEB-2160p";
+      dataDir = service_configs.sonarr.dataDir;
+      port = service_configs.ports.private.sonarr.port;
+      serviceName = "sonarr";
+    };
+  };
 }

services/arr/recyclarr.nix

@@ -46,6 +46,11 @@ in
       radarr.movies = {
         base_url = "http://localhost:${builtins.toString service_configs.ports.private.radarr.port}";
 
+        # Recyclarr is the sole authority for custom formats and scores.
+        # Overwrite any manually-created CFs and delete stale ones.
+        replace_existing_custom_formats = true;
+        delete_old_custom_formats = true;
+
         include = [
           { template = "radarr-quality-definition-movie"; }
           { template = "radarr-quality-profile-remux-web-2160p"; }
@@ -119,6 +124,11 @@ in
       sonarr.series = {
         base_url = "http://localhost:${builtins.toString service_configs.ports.private.sonarr.port}";
 
+        # Recyclarr is the sole authority for custom formats and scores.
+        # Overwrite any manually-created CFs and delete stale ones.
+        replace_existing_custom_formats = true;
+        delete_old_custom_formats = true;
+
         include = [
           { template = "sonarr-quality-definition-series"; }
           { template = "sonarr-v4-quality-profile-web-2160p"; }

services/gitea-actions-runner.nix

@@ -29,7 +29,7 @@
     settings = {
       runner = {
         capacity = 1;
-        timeout = "3h";
+        timeout = "6h";
       };
     };
   };

services/harmonia.nix

@@ -17,8 +17,22 @@
     settings.bind = "127.0.0.1:${toString service_configs.ports.private.harmonia.port}";
   };
 
+  # serve latest deploy store paths (unauthenticated — just a path string)
+  # CI writes to /var/lib/dotfiles-deploy/<hostname> after building
   services.caddy.virtualHosts."nix-cache.${service_configs.https.domain}".extraConfig = ''
-    import ${config.age.secrets.nix-cache-auth.path}
+    handle_path /deploy/* {
-    reverse_proxy :${toString service_configs.ports.private.harmonia.port}
+        root * /var/lib/dotfiles-deploy
+        file_server
+    }
+
+    handle {
+        import ${config.age.secrets.nix-cache-auth.path}
+        reverse_proxy :${toString service_configs.ports.private.harmonia.port}
+    }
   '';
+
+  # directory for CI to record latest deploy store paths
+  systemd.tmpfiles.rules = [
+    "d /var/lib/dotfiles-deploy 0755 gitea-runner gitea-runner"
+  ];
 }

services/jellyfin/jellyfin-qbittorrent-monitor.nix

@@ -5,14 +5,80 @@
   lib,
   ...
 }:
+let
+  webhookPlugin = import ./jellyfin-webhook-plugin.nix { inherit pkgs lib; };
+  jellyfinPort = service_configs.ports.private.jellyfin.port;
+  webhookPort = service_configs.ports.private.jellyfin_qbittorrent_monitor_webhook.port;
+in
 lib.mkIf config.services.jellyfin.enable {
+  # Materialise the Jellyfin Webhook plugin into Jellyfin's plugins dir before
+  # Jellyfin starts. Jellyfin rewrites meta.json at runtime, so a read-only
+  # nix-store symlink would EACCES -- we copy instead.
+  #
+  # `wantedBy = [ "jellyfin.service" ]` alone is insufficient on initial rollout:
+  # if jellyfin is already running at activation time, systemd won't start the
+  # oneshot until the next jellyfin restart. `restartTriggers` on jellyfin pinned
+  # to the plugin package + install script forces that restart whenever either
+  # changes, which invokes this unit via the `before`/`wantedBy` chain.
+  systemd.services.jellyfin-webhook-install = {
+    before = [ "jellyfin.service" ];
+    wantedBy = [ "jellyfin.service" ];
+    serviceConfig = {
+      Type = "oneshot";
+      RemainAfterExit = true;
+      User = config.services.jellyfin.user;
+      Group = config.services.jellyfin.group;
+      ExecStart = webhookPlugin.mkInstallScript {
+        pluginsDir = "${config.services.jellyfin.dataDir}/plugins";
+      };
+    };
+  };
+
+  systemd.services.jellyfin.restartTriggers = [
+    webhookPlugin.package
+    (webhookPlugin.mkInstallScript {
+      pluginsDir = "${config.services.jellyfin.dataDir}/plugins";
+    })
+  ];
+
+  # After Jellyfin starts, POST the plugin configuration so the webhook
+  # targets the monitor's receiver. Idempotent; runs on every boot.
+  systemd.services.jellyfin-webhook-configure = {
+    after = [ "jellyfin.service" ];
+    wants = [ "jellyfin.service" ];
+    before = [ "jellyfin-qbittorrent-monitor.service" ];
+    wantedBy = [ "multi-user.target" ];
+    serviceConfig = {
+      Type = "oneshot";
+      RemainAfterExit = true;
+      DynamicUser = true;
+      LoadCredential = "jellyfin-api-key:${config.age.secrets.jellyfin-api-key.path}";
+      ExecStart = webhookPlugin.mkConfigureScript {
+        jellyfinUrl = "http://127.0.0.1:${toString jellyfinPort}";
+        webhooks = [
+          {
+            name = "qBittorrent Monitor";
+            uri = "http://127.0.0.1:${toString webhookPort}/";
+            notificationTypes = [
+              "PlaybackStart"
+              "PlaybackProgress"
+              "PlaybackStop"
+            ];
+          }
+        ];
+      };
+    };
+  };
+
   systemd.services."jellyfin-qbittorrent-monitor" = {
     description = "Monitor Jellyfin streaming and control qBittorrent rate limits";
     after = [
       "network.target"
       "jellyfin.service"
       "qbittorrent.service"
+      "jellyfin-webhook-configure.service"
     ];
+    wants = [ "jellyfin-webhook-configure.service" ];
     wantedBy = [ "multi-user.target" ];
 
     serviceConfig = {
@@ -44,7 +110,7 @@ lib.mkIf config.services.jellyfin.enable {
     };
 
     environment = {
-      JELLYFIN_URL = "http://localhost:${builtins.toString service_configs.ports.private.jellyfin.port}";
+      JELLYFIN_URL = "http://localhost:${builtins.toString jellyfinPort}";
       QBITTORRENT_URL = "http://${config.vpnNamespaces.wg.namespaceAddress}:${builtins.toString service_configs.ports.private.torrent.port}";
       CHECK_INTERVAL = "30";
       # Bandwidth budget configuration
@@ -53,6 +119,9 @@ lib.mkIf config.services.jellyfin.enable {
       DEFAULT_STREAM_BITRATE = "10000000"; # 10 Mbps fallback when bitrate unknown (bps)
       MIN_TORRENT_SPEED = "100"; # KB/s - below this, pause torrents instead
       STREAM_BITRATE_HEADROOM = "1.1"; # multiplier per stream for bitrate fluctuations
+      # Webhook receiver: Jellyfin Webhook plugin POSTs events here to throttle immediately.
+      WEBHOOK_BIND = "127.0.0.1";
+      WEBHOOK_PORT = toString webhookPort;
     };
   };
 }

services/jellyfin/jellyfin-qbittorrent-monitor.py

@@ -7,6 +7,8 @@ import sys
 import signal
 import json
 import ipaddress
+import threading
+from http.server import HTTPServer, BaseHTTPRequestHandler
 
 logging.basicConfig(
     level=logging.INFO, format="%(asctime)s - %(levelname)s - %(message)s"
@@ -34,6 +36,8 @@ class JellyfinQBittorrentMonitor:
         default_stream_bitrate=10000000,
         min_torrent_speed=100,
         stream_bitrate_headroom=1.1,
+        webhook_port=0,
+        webhook_bind="127.0.0.1",
     ):
         self.jellyfin_url = jellyfin_url
         self.qbittorrent_url = qbittorrent_url
@@ -57,6 +61,12 @@ class JellyfinQBittorrentMonitor:
         self.streaming_stop_delay = streaming_stop_delay
         self.last_state_change = 0
 
+        # Webhook receiver: allows Jellyfin to push events instead of waiting for the poll
+        self.webhook_port = webhook_port
+        self.webhook_bind = webhook_bind
+        self.wake_event = threading.Event()
+        self.webhook_server = None
+
         # Local network ranges (RFC 1918 private networks + localhost)
         self.local_networks = [
             ipaddress.ip_network("10.0.0.0/8"),
@@ -79,9 +89,56 @@ class JellyfinQBittorrentMonitor:
     def signal_handler(self, signum, frame):
         logger.info("Received shutdown signal, cleaning up...")
         self.running = False
+        if self.webhook_server is not None:
+            # shutdown() blocks until serve_forever returns; run from a thread so we don't deadlock
+            threading.Thread(target=self.webhook_server.shutdown, daemon=True).start()
         self.restore_normal_limits()
         sys.exit(0)
 
+    def wake(self) -> None:
+        """Signal the main loop to re-evaluate state immediately."""
+        self.wake_event.set()
+
+    def sleep_or_wake(self, seconds: float) -> None:
+        """Wait up to `seconds`, returning early if a webhook wakes the loop."""
+        self.wake_event.wait(seconds)
+        self.wake_event.clear()
+
+    def start_webhook_server(self) -> None:
+        """Start a background HTTP server that wakes the monitor on any POST."""
+        if not self.webhook_port:
+            return
+
+        monitor = self
+
+        class WebhookHandler(BaseHTTPRequestHandler):
+            def do_POST(self):  # noqa: N802
+                length = int(self.headers.get("Content-Length", "0") or "0")
+                body = self.rfile.read(min(length, 65536)) if length else b""
+                event = "unknown"
+                try:
+                    if body:
+                        event = json.loads(body).get("NotificationType", "unknown")
+                except (json.JSONDecodeError, ValueError):
+                    pass
+                logger.info(f"Webhook received: {event}")
+                self.send_response(204)
+                self.end_headers()
+                monitor.wake()
+
+            def log_message(self, format, *args):
+                return  # suppress default access log
+
+        self.webhook_server = HTTPServer(
+            (self.webhook_bind, self.webhook_port), WebhookHandler
+        )
+        threading.Thread(
+            target=self.webhook_server.serve_forever, daemon=True, name="webhook-server"
+        ).start()
+        logger.info(
+            f"Webhook receiver listening on http://{self.webhook_bind}:{self.webhook_port}"
+        )
+
     def check_jellyfin_sessions(self) -> list[dict]:
         headers = (
             {"X-Emby-Token": self.jellyfin_api_key} if self.jellyfin_api_key else {}
@@ -297,10 +354,14 @@ class JellyfinQBittorrentMonitor:
         logger.info(f"Default stream bitrate: {self.default_stream_bitrate} bps")
         logger.info(f"Minimum torrent speed: {self.min_torrent_speed} KB/s")
         logger.info(f"Stream bitrate headroom: {self.stream_bitrate_headroom}x")
+        if self.webhook_port:
+            logger.info(f"Webhook receiver: {self.webhook_bind}:{self.webhook_port}")
 
         signal.signal(signal.SIGINT, self.signal_handler)
         signal.signal(signal.SIGTERM, self.signal_handler)
 
+        self.start_webhook_server()
+
         while self.running:
             try:
                 self.sync_qbittorrent_state()
@@ -309,7 +370,7 @@ class JellyfinQBittorrentMonitor:
                     active_streams = self.check_jellyfin_sessions()
                 except ServiceUnavailable:
                     logger.warning("Jellyfin unavailable, maintaining current state")
-                    time.sleep(self.check_interval)
+                    self.sleep_or_wake(self.check_interval)
                     continue
 
                 streaming_active = len(active_streams) > 0
@@ -394,13 +455,13 @@ class JellyfinQBittorrentMonitor:
 
                 self.current_state = desired_state
                 self.last_active_streams = active_streams
-                time.sleep(self.check_interval)
+                self.sleep_or_wake(self.check_interval)
 
             except KeyboardInterrupt:
                 break
             except Exception as e:
                 logger.error(f"Unexpected error in monitoring loop: {e}")
-                time.sleep(self.check_interval)
+                self.sleep_or_wake(self.check_interval)
 
         self.restore_normal_limits()
         logger.info("Monitor stopped")
@@ -421,6 +482,8 @@ if __name__ == "__main__":
     default_stream_bitrate = int(os.getenv("DEFAULT_STREAM_BITRATE", "10000000"))
     min_torrent_speed = int(os.getenv("MIN_TORRENT_SPEED", "100"))
     stream_bitrate_headroom = float(os.getenv("STREAM_BITRATE_HEADROOM", "1.1"))
+    webhook_port = int(os.getenv("WEBHOOK_PORT", "0"))
+    webhook_bind = os.getenv("WEBHOOK_BIND", "127.0.0.1")
 
     monitor = JellyfinQBittorrentMonitor(
         jellyfin_url=jellyfin_url,
@@ -434,6 +497,8 @@ if __name__ == "__main__":
         default_stream_bitrate=default_stream_bitrate,
         min_torrent_speed=min_torrent_speed,
         stream_bitrate_headroom=stream_bitrate_headroom,
+        webhook_port=webhook_port,
+        webhook_bind=webhook_bind,
     )
 
     monitor.run()

services/jellyfin/jellyfin-webhook-plugin.nix

@@ -0,0 +1,105 @@
+{ pkgs, lib }:
+let
+  pluginVersion = "18.0.0.0";
+  # GUID from the plugin's meta.json; addresses it on /Plugins/<guid>/Configuration.
+  pluginGuid = "71552a5a-5c5c-4350-a2ae-ebe451a30173";
+
+  package = pkgs.stdenvNoCC.mkDerivation {
+    pname = "jellyfin-plugin-webhook";
+    version = pluginVersion;
+    src = pkgs.fetchurl {
+      url = "https://repo.jellyfin.org/files/plugin/webhook/webhook_${pluginVersion}.zip";
+      hash = "sha256-LFFojiPnBGl9KJ0xVyPBnCmatcaeVbllRwRkz5Z3dqI=";
+    };
+    nativeBuildInputs = [ pkgs.unzip ];
+    unpackPhase = ''unzip "$src"'';
+    installPhase = ''
+      mkdir -p "$out"
+      cp *.dll meta.json "$out/"
+    '';
+    dontFixup = true; # managed .NET assemblies must not be patched
+  };
+
+  # Minimal Handlebars template, base64 encoded. The monitor only needs the POST;
+  # NotificationType is parsed for the debug log line.
+  # Decoded: {"NotificationType":"{{NotificationType}}"}
+  templateB64 = "eyJOb3RpZmljYXRpb25UeXBlIjoie3tOb3RpZmljYXRpb25UeXBlfX0ifQ==";
+
+  # Build a PluginConfiguration payload accepted by Jellyfin's JSON deserializer.
+  # Each webhook is `{ name, uri, notificationTypes }`.
+  mkConfigJson =
+    webhooks:
+    builtins.toJSON {
+      ServerUrl = "";
+      GenericOptions = map (w: {
+        NotificationTypes = w.notificationTypes;
+        WebhookName = w.name;
+        WebhookUri = w.uri;
+        EnableMovies = true;
+        EnableEpisodes = true;
+        EnableVideos = true;
+        EnableWebhook = true;
+        Template = templateB64;
+        Headers = [
+          {
+            Key = "Content-Type";
+            Value = "application/json";
+          }
+        ];
+      }) webhooks;
+    };
+
+  # Oneshot that POSTs the plugin configuration. Retries past the window
+  # between Jellyfin API health and plugin registration.
+  mkConfigureScript =
+    { jellyfinUrl, webhooks }:
+    pkgs.writeShellScript "jellyfin-webhook-configure" ''
+      set -euo pipefail
+      export PATH=${
+        lib.makeBinPath [
+          pkgs.coreutils
+          pkgs.curl
+        ]
+      }
+
+      URL=${lib.escapeShellArg jellyfinUrl}
+      AUTH="Authorization: MediaBrowser Token=\"$(cat "$CREDENTIALS_DIRECTORY/jellyfin-api-key")\""
+      CONFIG=${lib.escapeShellArg (mkConfigJson webhooks)}
+
+      for _ in $(seq 1 120); do curl -sf -o /dev/null "$URL/health" && break; sleep 1; done
+      curl -sf -o /dev/null "$URL/health"
+
+      for _ in $(seq 1 60); do
+        if printf '%s' "$CONFIG" | curl -sf -X POST \
+          -H "$AUTH" -H "Content-Type: application/json" --data-binary @- \
+          "$URL/Plugins/${pluginGuid}/Configuration"; then
+          echo "Jellyfin webhook plugin configured"; exit 0
+        fi
+        sleep 1
+      done
+      echo "Failed to configure webhook plugin" >&2; exit 1
+    '';
+
+  # Materialise a writable copy of the plugin. Jellyfin rewrites meta.json at
+  # runtime, so a read-only nix-store symlink would EACCES.
+  mkInstallScript =
+    { pluginsDir }:
+    pkgs.writeShellScript "jellyfin-webhook-install" ''
+      set -euo pipefail
+      export PATH=${lib.makeBinPath [ pkgs.coreutils ]}
+      dst=${lib.escapeShellArg "${pluginsDir}/Webhook_${pluginVersion}"}
+      mkdir -p ${lib.escapeShellArg pluginsDir}
+      rm -rf "$dst" && mkdir -p "$dst"
+      cp ${package}/*.dll ${package}/meta.json "$dst/"
+      chmod u+rw "$dst"/*
+    '';
+in
+{
+  inherit
+    package
+    pluginVersion
+    pluginGuid
+    mkConfigureScript
+    mkInstallScript
+    ;
+}

services/jellyfin/jellyfin.nix

@@ -26,6 +26,14 @@
 
   services.caddy.virtualHosts."jellyfin.${service_configs.https.domain}".extraConfig = ''
     reverse_proxy :${builtins.toString service_configs.ports.private.jellyfin.port} {
+      # Disable response buffering for streaming. Caddy's default partial
+      # buffering delays fMP4-HLS segments and direct-play responses where
+      # Content-Length is known (so auto-flush doesn't trigger).
+      flush_interval -1
+      transport http {
+        # Localhost: compression wastes CPU re-encoding already-compressed media.
+        compression off
+      }
       header_up X-Real-IP {remote_host}
       header_up X-Forwarded-For {remote_host}
       header_up X-Forwarded-Proto {scheme}

services/minecraft.nix

@@ -37,15 +37,21 @@
 
     servers.${service_configs.minecraft.server_name} = {
       enable = true;
-      package = pkgs.fabricServers.fabric-1_21_11;
+      package = pkgs.fabricServers.fabric-26_1_2.override { jre_headless = pkgs.openjdk25_headless; };
 
       jvmOpts = lib.concatStringsSep " " [
         # Memory
         "-Xmx${builtins.toString service_configs.minecraft.memory.heap_size_m}M"
         "-Xms${builtins.toString service_configs.minecraft.memory.heap_size_m}M"
+
         # GC
         "-XX:+UseZGC"
         "-XX:+ZGenerational"
+
+        # added in new minecraft version
+        "-XX:+UseCompactObjectHeaders"
+        "-XX:+UseStringDeduplication"
+
         # Base JVM optimizations (brucethemoose/Minecraft-Performance-Flags-Benchmarks)
         "-XX:+UnlockExperimentalVMOptions"
         "-XX:+UnlockDiagnosticVMOptions"
@@ -67,6 +73,7 @@
         "-XX:NonProfiledCodeHeapSize=194M"
         "-XX:NmethodSweepActivity=1"
         "-XX:+UseVectorCmov"
+
         # Large pages (requires vm.nr_hugepages sysctl)
         "-XX:+UseLargePages"
         "-XX:LargePageSizeInBytes=${builtins.toString service_configs.minecraft.memory.large_page_size_m}M"
@@ -92,71 +99,68 @@
           with pkgs;
           builtins.attrValues {
             FabricApi = fetchurl {
-              url = "https://cdn.modrinth.com/data/P7dR8mSH/versions/i5tSkVBH/fabric-api-0.141.3%2B1.21.11.jar";
+              url = "https://cdn.modrinth.com/data/P7dR8mSH/versions/fm7UYECV/fabric-api-0.145.4%2B26.1.2.jar";
-              sha512 = "c20c017e23d6d2774690d0dd774cec84c16bfac5461da2d9345a1cd95eee495b1954333c421e3d1c66186284d24a433f6b0cced8021f62e0bfa617d2384d0471";
+              sha512 = "ffd5ef62a745f76cd2e5481252cb7bc67006c809b4f436827d05ea22c01d19279e94a3b24df3d57e127af1cd08440b5de6a92a4ea8f39b2dcbbe1681275564c3";
             };
 
-            FerriteCore = fetchurl {
+            # No 26.1.2 version available
-              url = "https://cdn.modrinth.com/data/uXXizFIs/versions/Ii0gP3D8/ferritecore-8.2.0-fabric.jar";
+            # FerriteCore = fetchurl {
-              sha512 = "3210926a82eb32efd9bcebabe2f6c053daf5c4337eebc6d5bacba96d283510afbde646e7e195751de795ec70a2ea44fef77cb54bf22c8e57bb832d6217418869";
+            #   url = "https://cdn.modrinth.com/data/uXXizFIs/versions/d5ddUdiB/ferritecore-9.0.0-fabric.jar";
-            };
+            #   sha512 = "d81fa97e11784c19d42f89c2f433831d007603dd7193cee45fa177e4a6a9c52b384b198586e04a0f7f63cd996fed713322578bde9a8db57e1188854ae5cbe584";
+            # };
 
             Lithium = fetchurl {
-              url = "https://cdn.modrinth.com/data/gvQqBUqZ/versions/Ow7wA0kG/lithium-fabric-0.21.4%2Bmc1.21.11.jar";
+              url = "https://cdn.modrinth.com/data/gvQqBUqZ/versions/v2xoRvRP/lithium-fabric-0.24.1%2Bmc26.1.2.jar";
-              sha512 = "f14a5c3d2fad786347ca25083f902139694f618b7c103947f2fd067a7c5ee88a63e1ef8926f7d693ea79ed7d00f57317bae77ef9c2d630bf5ed01ac97a752b94";
+              sha512 = "8711bc8c6f39be4c8511becb7a68e573ced56777bd691639f2fc62299b35bb4ccd2efe4a39bd9c308084b523be86a5f5c4bf921ab85f7a22bf075d8ea2359621";
             };
 
             NoChatReports = fetchurl {
-              url = "https://cdn.modrinth.com/data/qQyHxfxd/versions/rhykGstm/NoChatReports-FABRIC-1.21.11-v2.18.0.jar";
+              url = "https://cdn.modrinth.com/data/qQyHxfxd/versions/2yrLNE3S/NoChatReports-FABRIC-26.1-v2.19.0.jar";
-              sha512 = "d2c35cc8d624616f441665aff67c0e366e4101dba243bad25ed3518170942c1a3c1a477b28805cd1a36c44513693b1c55e76bea627d3fced13927a3d67022ccc";
+              sha512 = "94d58a1a4cde4e3b1750bdf724e65c5f4ff3436c2532f36a465d497d26bf59f5ac996cddbff8ecdfed770c319aa2f2dcc9c7b2d19a35651c2a7735c5b2124dad";
             };
 
             squaremap = fetchurl {
-              url = "https://cdn.modrinth.com/data/PFb7ZqK6/versions/BW8lMXBi/squaremap-fabric-mc1.21.11-1.3.12.jar";
+              url = "https://cdn.modrinth.com/data/PFb7ZqK6/versions/UBN6MFvH/squaremap-fabric-mc26.1.2-1.3.13.jar";
-              sha512 = "f62eb791a3f5812eb174565d318f2e6925353f846ef8ac56b4e595f481494e0c281f26b9e9fcfdefa855093c96b735b12f67ee17c07c2477aa7a3439238670d9";
+              sha512 = "97bc130184b5d0ddc4ff98a15acef6203459d982e0e2afbd49a2976d546c55a86ef22b841378b51dd782be9b2cfbe4cfa197717f2b7f6800fd8b4ff4df6e564f";
             };
 
             scalablelux = fetchurl {
-              url = "https://cdn.modrinth.com/data/Ps1zyz6x/versions/PV9KcrYQ/ScalableLux-0.1.6%2Bfabric.c25518a-all.jar";
+              url = "https://cdn.modrinth.com/data/Ps1zyz6x/versions/gYbHVCz8/ScalableLux-0.2.0%2Bfabric.2b63825-all.jar";
-              sha512 = "729515c1e75cf8d9cd704f12b3487ddb9664cf9928e7b85b12289c8fbbc7ed82d0211e1851375cbd5b385820b4fedbc3f617038fff5e30b302047b0937042ae7";
+              sha512 = "48565a4d8a1cbd623f0044086d971f2c0cf1c40e1d0b6636a61d41512f4c1c1ddff35879d9dba24b088a670ee254e2d5842d13a30b6d76df23706fa94ea4a58b";
             };
 
             c2me = fetchurl {
-              url = "https://cdn.modrinth.com/data/VSNURh3q/versions/QdLiMUjx/c2me-fabric-mc1.21.11-0.3.7%2Balpha.0.7.jar";
+              url = "https://cdn.modrinth.com/data/VSNURh3q/versions/yrNQQ1AQ/c2me-fabric-mc26.1.2-0.3.7%2Balpha.0.65.jar";
-              sha512 = "f9543febe2d649a82acd6d5b66189b6a3d820cf24aa503ba493fdb3bbd4e52e30912c4c763fe50006f9a46947ae8cd737d420838c61b93429542573ed67f958e";
+              sha512 = "6666ebaa3bfa403e386776590fc845b7c306107d37ebc7b1be3b057893fbf9f933abb2314c171d7fe19c177cf8823cb47fdc32040d34a9704f5ab656dd5d93f8";
             };
 
-            krypton = fetchurl {
+            # No 26.1 version available
-              url = "https://cdn.modrinth.com/data/fQEb0iXm/versions/O9LmWYR7/krypton-0.2.10.jar";
+            # krypton = fetchurl {
-              sha512 = "4dcd7228d1890ddfc78c99ff284b45f9cf40aae77ef6359308e26d06fa0d938365255696af4cc12d524c46c4886cdcd19268c165a2bf0a2835202fe857da5cab";
+            #   url = "https://cdn.modrinth.com/data/fQEb0iXm/versions/O9LmWYR7/krypton-0.2.10.jar";
-            };
+            #   sha512 = "4dcd7228d1890ddfc78c99ff284b45f9cf40aae77ef6359308e26d06fa0d938365255696af4cc12d524c46c4886cdcd19268c165a2bf0a2835202fe857da5cab";
+            # };
 
-            better-fabric-console = fetchurl {
+            # No 26.1.2 version available
-              url = "https://cdn.modrinth.com/data/Y8o1j1Sf/versions/6aIKl5wy/better-fabric-console-mc1.21.11-1.2.9.jar";
+            # disconnect-packet-fix = fetchurl {
-              sha512 = "427247dafd99df202ee10b4bf60ffcbbecbabfadb01c167097ffb5b85670edb811f4d061c2551be816295cbbc6b8ec5ec464c14a6ff41912ef1f6c57b038d320";
+            #   url = "https://cdn.modrinth.com/data/rd9rKuJT/versions/x9gVeaTU/disconnect-packet-fix-fabric-2.1.0.jar";
-            };
+            #   sha512 = "bf84d02bdcd737706df123e452dd31ef535580fa4ced6af1e4ceea022fef94e4764775253e970b8caa1292e2fa00eb470557f70b290fafdb444479fa801b07a1";
-
+            # };
-            disconnect-packet-fix = fetchurl {
-              url = "https://cdn.modrinth.com/data/rd9rKuJT/versions/Gv74xveQ/disconnect-packet-fix-fabric-2.0.0.jar";
-              sha512 = "1fd6f09a41ce36284e1a8e9def53f3f6834d7201e69e54e24933be56445ba569fbc26278f28300d36926ba92db6f4f9c0ae245d23576aaa790530345587316db";
-            };
 
             packet-fixer = fetchurl {
-              url = "https://cdn.modrinth.com/data/c7m1mi73/versions/CUh1DWeO/packetfixer-fabric-3.3.4-1.21.11.jar";
+              url = "https://cdn.modrinth.com/data/c7m1mi73/versions/M8PqPQr4/packetfixer-fabric-3.3.4-26.1.2.jar";
-              sha512 = "33331b16cb40c5e6fbaade3cacc26f3a0e8fa5805a7186f94d7366a0e14dbeee9de2d2e8c76fa71f5e9dd24eb1c261667c35447e32570ea965ca0f154fdfba0a";
+              sha512 = "698020edba2a1fd80bb282bfd4832a00d6447b08eaafbc2e16a8f3bf89e187fc9a622c92dfe94ae140dd485fc0220a86890f12158ec08054e473fef8337829bc";
             };
 
-            # fork of Modernfix for 1.21.11 (upstream will support 26.1)
+            # mVUS fork: upstream ModernFix no longer ships Fabric builds
             modernfix = fetchurl {
-              url = "https://cdn.modrinth.com/data/TjSm1wrD/versions/JwSO8JCN/modernfix-5.25.2-build.4.jar";
+              url = "https://cdn.modrinth.com/data/TjSm1wrD/versions/dqQ7mabN/modernfix-5.26.2-build.1.jar";
-              sha512 = "0d65c05ac0475408c58ef54215714e6301113101bf98bfe4bb2ba949fbfddd98225ac4e2093a5f9206a9e01ba80a931424b237bdfa3b6e178c741ca6f7f8c6a3";
+              sha512 = "fbef93c2dabf7bcd0ccd670226dfc4958f7ebe5d8c2b1158e88a65e6954a40f595efd58401d2a3dbb224660dca5952199cf64df29100e7bd39b1b1941290b57b";
             };
 
             debugify = fetchurl {
-              url = "https://cdn.modrinth.com/data/QwxR6Gcd/versions/8Q49lnaU/debugify-1.21.11%2B1.0.jar";
+              url = "https://cdn.modrinth.com/data/QwxR6Gcd/versions/mfTTfiKn/debugify-26.1.2%2B1.0.jar";
-              sha512 = "04d82dd33f44ced37045f1f9a54ad4eacd70861ff74a8800f2d2df358579e6cb0ea86a34b0086b3e87026b1a0691dd6594b4fdc49f89106466eea840518beb03";
+              sha512 = "63db82f2163b9f7fc27ebea999ffcd7a961054435b3ed7d8bf32d905b5f60ce81715916b7fd4e9509dd23703d5492059f3ce7e5f176402f8ed4f985a415553f4";
             };
-
           }
         );
       };

services/monero/xmrig-auto-pause.nix

@@ -26,11 +26,12 @@ lib.mkIf config.services.xmrig.enable {
     environment = {
       POLL_INTERVAL = "3";
       GRACE_PERIOD = "15";
-      # This server's background services (qbittorrent, monero, bazarr, etc.)
+      # Background services (qbittorrent, bitmagnet, postgresql, etc.) produce
-      # produce 5-14% non-nice CPU during normal operation. Thresholds must
+      # 15-25% non-nice CPU during normal operation. The stop threshold must
-      # sit above that noise floor.
+      # sit above transient spikes; the resume threshold must be below the
+      # steady-state floor to avoid restarting xmrig while services are active.
       CPU_STOP_THRESHOLD = "40";
-      CPU_RESUME_THRESHOLD = "30";
+      CPU_RESUME_THRESHOLD = "10";
       STARTUP_COOLDOWN = "10";
       STATE_DIR = "/var/lib/xmrig-auto-pause";
     };

services/qbittorrent.nix

@@ -23,7 +23,9 @@ in
     (lib.serviceFilePerms "qbittorrent" [
       # 0770: group (media) needs write to delete files during upgrades —
       # Radarr/Sonarr must unlink the old file before placing the new one.
-      "Z ${config.services.qbittorrent.serverConfig.Preferences.Downloads.SavePath} 0770 ${config.services.qbittorrent.user} ${service_configs.media_group}"
+      # Non-recursive (z not Z): UMask=0007 ensures new files get correct perms.
+      # A recursive Z rule would walk millions of files on the HDD pool at every boot.
+      "z ${config.services.qbittorrent.serverConfig.Preferences.Downloads.SavePath} 0770 ${config.services.qbittorrent.user} ${service_configs.media_group}"
       "z ${config.services.qbittorrent.serverConfig.Preferences.Downloads.TempPath} 0700 ${config.services.qbittorrent.user} ${config.services.qbittorrent.group}"
       "Z ${config.services.qbittorrent.profileDir} 0700 ${config.services.qbittorrent.user} ${config.services.qbittorrent.group}"
     ])
@@ -162,6 +164,35 @@ in
     _: path: "d ${path} 0770 ${config.services.qbittorrent.user} ${service_configs.media_group} -"
   ) service_configs.torrent.categories;
 
+  # Periodically checkpoint qBittorrent's SQLite WAL (Write-Ahead Log).
+  # qBittorrent holds a read transaction open for its entire lifetime,
+  # preventing SQLite's auto-checkpoint from running. The WAL grows
+  # unbounded (observed: 405 MB) and must be replayed on next startup,
+  # causing 10+ minute "internal preparations" hangs.
+  # A second sqlite3 connection can checkpoint concurrently and safely.
+  # See: https://github.com/qbittorrent/qBittorrent/issues/20433
+  systemd.services.qbittorrent-wal-checkpoint = {
+    description = "Checkpoint qBittorrent SQLite WAL";
+    after = [ "qbittorrent.service" ];
+    requires = [ "qbittorrent.service" ];
+    serviceConfig = {
+      Type = "oneshot";
+      ExecStart = "${pkgs.sqlite}/bin/sqlite3 ${config.services.qbittorrent.profileDir}/qBittorrent/data/torrents.db 'PRAGMA wal_checkpoint(TRUNCATE);'";
+      User = config.services.qbittorrent.user;
+      Group = config.services.qbittorrent.group;
+    };
+  };
+
+  systemd.timers.qbittorrent-wal-checkpoint = {
+    description = "Periodically checkpoint qBittorrent SQLite WAL";
+    wantedBy = [ "timers.target" ];
+    timerConfig = {
+      OnUnitActiveSec = "4h";
+      OnBootSec = "30min";
+      RandomizedDelaySec = "10min";
+    };
+  };
+
   users.users.${config.services.qbittorrent.user}.extraGroups = [
     service_configs.media_group
   ];

tests/jellyfin-qbittorrent-monitor.nix

@@ -6,6 +6,21 @@
 }:
 let
   jfLib = import ./jellyfin-test-lib.nix { inherit pkgs lib; };
+  webhookPlugin = import ../services/jellyfin/jellyfin-webhook-plugin.nix { inherit pkgs lib; };
+  configureWebhook = webhookPlugin.mkConfigureScript {
+    jellyfinUrl = "http://localhost:8096";
+    webhooks = [
+      {
+        name = "qBittorrent Monitor";
+        uri = "http://127.0.0.1:9898/";
+        notificationTypes = [
+          "PlaybackStart"
+          "PlaybackProgress"
+          "PlaybackStop"
+        ];
+      }
+    ];
+  };
 in
 pkgs.testers.runNixOSTest {
   name = "jellyfin-qbittorrent-monitor";
@@ -69,11 +84,30 @@ pkgs.testers.runNixOSTest {
           }
         ];
 
-        # Create directories for qBittorrent
+        # Create directories for qBittorrent.
         systemd.tmpfiles.rules = [
           "d /var/lib/qbittorrent/downloads 0755 qbittorrent qbittorrent"
           "d /var/lib/qbittorrent/incomplete 0755 qbittorrent qbittorrent"
         ];
+
+        # Install the Jellyfin Webhook plugin before Jellyfin starts, mirroring
+        # the production module. Jellyfin rewrites meta.json at runtime so a
+        # read-only nix-store symlink would fail — we materialise a writable copy.
+        systemd.services."jellyfin-webhook-install" = {
+          description = "Install Jellyfin Webhook plugin files";
+          before = [ "jellyfin.service" ];
+          wantedBy = [ "jellyfin.service" ];
+          serviceConfig = {
+            Type = "oneshot";
+            RemainAfterExit = true;
+            User = "jellyfin";
+            Group = "jellyfin";
+            UMask = "0077";
+            ExecStart = webhookPlugin.mkInstallScript {
+              pluginsDir = "/var/lib/jellyfin/plugins";
+            };
+          };
+        };
       };
 
     # Public test IP (RFC 5737 TEST-NET-3) so Jellyfin sees it as external
@@ -394,6 +428,97 @@ pkgs.testers.runNixOSTest {
         local_playback["PositionTicks"] = 50000000
         server.succeed(f"curl -sf -X POST 'http://localhost:8096/Sessions/Playing/Stopped' -d '{json.dumps(local_playback)}' -H 'Content-Type:application/json' -H 'X-Emby-Authorization:{local_auth}, Token={local_token}'")
 
+    # === WEBHOOK TESTS ===
+    #
+    # Configure the Jellyfin Webhook plugin to target the monitor, then verify
+    # the real Jellyfin → plugin → monitor path reacts faster than any possible
+    # poll. CHECK_INTERVAL=30 rules out polling as the cause.
+
+    WEBHOOK_PORT = 9898
+    WEBHOOK_CREDS = "/tmp/webhook-creds"
+
+    # Start a webhook-enabled monitor with long poll interval.
+    server.succeed("systemctl stop monitor-test || true")
+    time.sleep(1)
+    server.succeed(f"""
+      systemd-run --unit=monitor-webhook \
+        --setenv=JELLYFIN_URL=http://localhost:8096 \
+        --setenv=JELLYFIN_API_KEY={token} \
+        --setenv=QBITTORRENT_URL=http://localhost:8080 \
+        --setenv=CHECK_INTERVAL=30 \
+        --setenv=STREAMING_START_DELAY=1 \
+        --setenv=STREAMING_STOP_DELAY=1 \
+        --setenv=TOTAL_BANDWIDTH_BUDGET=50000000 \
+        --setenv=SERVICE_BUFFER=2000000 \
+        --setenv=DEFAULT_STREAM_BITRATE=10000000 \
+        --setenv=MIN_TORRENT_SPEED=100 \
+        --setenv=WEBHOOK_PORT={WEBHOOK_PORT} \
+        --setenv=WEBHOOK_BIND=127.0.0.1 \
+        {python} {monitor}
+    """)
+    server.wait_until_succeeds(f"ss -ltn | grep -q ':{WEBHOOK_PORT}'", timeout=15)
+    time.sleep(2)
+    assert not is_throttled(), "Should start unthrottled"
+
+    # Drop the admin token where the configure script expects it (production uses agenix).
+    server.succeed(f"mkdir -p {WEBHOOK_CREDS} && echo '{token}' > {WEBHOOK_CREDS}/jellyfin-api-key")
+    server.succeed(
+        f"systemd-run --wait --unit=webhook-configure-test "
+        f"--setenv=CREDENTIALS_DIRECTORY={WEBHOOK_CREDS} "
+        f"${configureWebhook}"
+    )
+
+    with subtest("Real PlaybackStart event throttles via the plugin"):
+        playback_start = {
+            "ItemId": movie_id,
+            "MediaSourceId": media_source_id,
+            "PlaySessionId": "test-plugin-start",
+            "CanSeek": True,
+            "IsPaused": False,
+        }
+        start_cmd = f"curl -sf -X POST 'http://{server_ip}:8096/Sessions/Playing' -d '{json.dumps(playback_start)}' -H 'Content-Type:application/json' -H 'X-Emby-Authorization:{client_auth}, Token={client_token}'"
+        client.succeed(start_cmd)
+        server.wait_until_succeeds(
+            "curl -sf http://localhost:8080/api/v2/transfer/speedLimitsMode | grep -q '^1$'",
+            timeout=5,
+        )
+        # Let STREAMING_STOP_DELAY (1s) elapse so the upcoming stop is not swallowed by hysteresis.
+        time.sleep(2)
+
+    with subtest("Real PlaybackStop event unthrottles via the plugin"):
+        playback_stop = {
+            "ItemId": movie_id,
+            "MediaSourceId": media_source_id,
+            "PlaySessionId": "test-plugin-start",
+            "PositionTicks": 50000000,
+        }
+        stop_cmd = f"curl -sf -X POST 'http://{server_ip}:8096/Sessions/Playing/Stopped' -d '{json.dumps(playback_stop)}' -H 'Content-Type:application/json' -H 'X-Emby-Authorization:{client_auth}, Token={client_token}'"
+        client.succeed(stop_cmd)
+        server.wait_until_succeeds(
+            "curl -sf http://localhost:8080/api/v2/transfer/speedLimitsMode | grep -q '^0$'",
+            timeout=10,
+        )
+
+    # Restore fast-polling monitor for the service-restart tests below.
+    server.succeed("systemctl stop monitor-webhook || true")
+    time.sleep(1)
+    server.succeed(f"""
+      systemd-run --unit=monitor-test \
+        --setenv=JELLYFIN_URL=http://localhost:8096 \
+        --setenv=JELLYFIN_API_KEY={token} \
+        --setenv=QBITTORRENT_URL=http://localhost:8080 \
+        --setenv=CHECK_INTERVAL=1 \
+        --setenv=STREAMING_START_DELAY=1 \
+        --setenv=STREAMING_STOP_DELAY=1 \
+        --setenv=TOTAL_BANDWIDTH_BUDGET=50000000 \
+        --setenv=SERVICE_BUFFER=2000000 \
+        --setenv=DEFAULT_STREAM_BITRATE=10000000 \
+        --setenv=MIN_TORRENT_SPEED=100 \
+        {python} {monitor}
+    """)
+    time.sleep(2)
+
+
     # === SERVICE RESTART TESTS ===
 
     with subtest("qBittorrent restart during throttled state re-applies throttling"):