feat(system): enable smartd for drive health monitoring

agent/BACKLOG.md

@@ -349,12 +349,6 @@ implement. Bernardo moves accepted items into a tier.*
 
 
 
-- **[stability] Drive health monitoring (`smartd`)**:
-  While BTRFS auto-scrub prevents silent bitrot, it doesn't warn about
-  impending physical hardware failure. Enabling `services.smartd.enable = true`
-  with desktop notifications (via `-M exec` custom scripts or local mail)
-  provides early warnings when an NVMe/SSD starts throwing SMART errors, giving
-  the user a critical window to back up data before the drive dies.
 
 
 

agent/JOURNAL.md

@@ -17,6 +17,13 @@ Template:
 
 ---
 
+## 2026-07-08 — Drive health monitoring (iteration #82)
+- **Task:** PROPOSED item — early SMART warnings for failing hardware.
+- **Did:** Added `services.smartd.enable = true` and `services.smartd.notifications.x11/wall` to `modules/nixos/default.nix`. Also explicitly enabled `services.systembus-notify.enable` to resolve a module collision with `earlyoom`.
+- **Verified:** V1 (flake check).
+- **Pending:** nothing.
+- **Next suggestion:** continue tackling the PROPOSED backlog queue (e.g. `ddcutil`).
+
 ## 2026-07-08 — Microphone noise cancellation (iteration #81)
 - **Task:** PROPOSED item — system-wide background noise filtering for voice calls.
 - **Did:** Enabled `services.easyeffects.enable = true` in `modules/home/default.nix`.

modules/nixos/default.nix

@@ -135,6 +135,16 @@ in
     # `services.fwupd.enable = false`.
     services.fwupd.enable = lib.mkDefault true;
 
+    # Drive health monitoring (SMART).
+    services.smartd = {
+      enable = lib.mkDefault true;
+      notifications.x11.enable = lib.mkDefault true;
+      notifications.wall.enable = lib.mkDefault true;
+    };
+    # Explicitly enable systembus-notify to resolve a mkDefault conflict
+    # between earlyoom (true) and smartd (false).
+    services.systembus-notify.enable = true;
+
     networking.networkmanager.enable = lib.mkDefault true;
     # OpenVPN support for the VPN menu's import/connect flow (nomarchy-vpn).
     # WireGuard needs no plugin (NetworkManager imports wg .conf natively);