more migration stuff

parts/core.nix

@@ -171,6 +171,32 @@ in
           |> lib.attrValues
           |> map (srv: srv.port)
         );
+      mkEnabled = name: {
+        inherit name;
+        value.enable = true;
+      };
+      mkEnabledWithProxy = name: {
+        inherit name;
+        value = {
+          enable = true;
+          enableProxy = true;
+        };
+      };
+      mkEnabledIp = ip: name: {
+        inherit name;
+        value = {
+          enable = true;
+          inherit ip;
+        };
+      };
+      enableList = func: list: list |> map func |> builtins.listToAttrs;
+      mkPostgresDependency = config: serviceName: displayName: {
+        assertion = config.my.servers.${serviceName}.enable -> config.my.servers.postgres.enable;
+        message = "${displayName} requires PostgreSQL to be enabled";
+      };
+      mkPostgresDependencies =
+        config: serviceMap:
+        serviceMap |> map (entry: inputs.self.lib.mkPostgresDependency config entry.service entry.name);
     };
   };
 }