add anarkafem.dev, minor tweaks

config/hosts/grondahl/services/postgres.nix

@@ -0,0 +1,28 @@
+{ pkgs, ... }:
+{
+  services.postgresql = {
+    enable = true;
+    package = pkgs.postgresql_13;
+    initialScript = pkgs.writeText "synapse-init.sql" ''
+                      CREATE ROLE synapse;
+                      CREATE DATABASE synapse WITH OWNER synapse
+                          TEMPLATE template0
+                          LC_COLLATE = "C"
+                          LC_CTYPE = "C"
+                          ENCODING = "UTF8";
+    '';
+    authentication = pkgs.lib.mkOverride 10 ''
+        local all all trust
+        host all all ::1/128 trust
+    '';
+  };
+
+  services.postgresqlBackup = {
+    enable = true;
+    location = "/var/lib/postgresql/backup";
+    databases = [ "synapse" ];
+    startAt = "02:30";
+    compression = "none";
+  };
+}
+