Add flowtrack period tracker

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

services/authelia.nix

@@ -44,6 +44,8 @@
             { domain = "reddit.nordhammer.it";    policy = "one_factor"; }
             { domain = "panel.nordhammer.it";     policy = "one_factor"; }
             { domain = "stardew.nordhammer.it";  policy = "one_factor"; }
+            # Health data: only the two people the app knows about.
+            { domain = "flowtrack.nordhammer.it"; policy = "one_factor"; subject = [ "user:kayla" "user:fred" ]; }
           ];
         };
 
@@ -52,8 +54,10 @@
             domain = "nordhammer.it";
             authelia_url = "https://auth.nordhammer.it";
           }];
-          expiration = "12h";
-          inactivity = "2h";
+          # Long enough that the home-screen Flowtrack app on a phone does not
+          # ask for a login every time it opens.
+          expiration = "30d";
+          inactivity = "7d";
         };
 
         storage.local.path = "/var/lib/authelia-main/db.sqlite3";

services/flowtrack.nix

@@ -0,0 +1,21 @@
+# services/flowtrack.nix — Kayla's private period tracker.
+#
+# The application and NixOS module live in the standalone flowtrack flake.
+# nginx is the only public listener and Authelia admits just kayla and fred;
+# the app maps them to owner and read-only viewer. Nightly snapshots go
+# straight to the SSD branch of the pool (not via mergerfs), which had the
+# cleanest SMART record of the data disks.
+{ config, lib, ... }:
+{
+  config = lib.mkIf (config.networking.hostName == "FredOS-Mediaserver") {
+    services.flowtrack = {
+      enable = true;
+      port = 8093;
+      editors = [ "kayla" ];
+      viewers = [ "fred" ];
+      backup.directory = "/mnt/disk2/backups/flowtrack";
+    };
+
+    systemd.tmpfiles.rules = [ "d /mnt/disk2/backups 0755 root root -" ];
+  };
+}

services/nginx.nix

@@ -203,6 +203,13 @@ in
             proxy_set_header Remote-Email $email;
           '';
         };
+        # Period tracker. The app trusts Remote-User for roles, so nginx must
+        # always overwrite it with the Authelia identity.
+        "flowtrack.nordhammer.it" = lib.recursiveUpdate (protectedProxy 8093) {
+          locations."/".extraConfig = autheliaAuthConfig + ''
+            proxy_set_header Remote-User $user;
+          '';
+        };
 
         # Pelican game panel. Can't turn off its own login (no such option
         # upstream), so Authelia is the outer gate and the Pelican account