From db7b05a46e1ab00308f6bf5c65c1a1c0a44e4a66 Mon Sep 17 00:00:00 2001
From: Dan <dleink@gmail.com>
Date: Sat, 10 Jan 2026 16:07:13 -0800
Subject: [PATCH] Pin PostgreSQL to v15 for NixOS 24.11 upgrade

Prevents automatic upgrade to PostgreSQL 16 when upgrading NixOS.
This allows a safer two-step approach: upgrade NixOS first, then
pg_upgrade later.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
---
 modules/dev-services.nix | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/modules/dev-services.nix b/modules/dev-services.nix
index d7c9c9b..caa2370 100644
--- a/modules/dev-services.nix
+++ b/modules/dev-services.nix
@@ -1,5 +1,5 @@
 # Development services module - Matrix, Forgejo, and Slack bridge
-{ config, pkgs-unstable, lib, ... }:
+{ config, pkgs, pkgs-unstable, lib, ... }:
 
 with lib;
 
@@ -99,8 +99,10 @@ in
 
   config = mkIf cfg.enable {
     # PostgreSQL for Forgejo and bridge services (Matrix uses RocksDB)
+    # Pin to v15 to prevent auto-upgrade to v16 in NixOS 24.11
     services.postgresql = {
       enable = true;
+      package = pkgs.postgresql_15;
       ensureDatabases = [
         "forgejo"
       ] ++ optional cfg.slackBridge.enable "mautrix_slack";