diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 8fc3573..390ea26 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -48,6 +48,8 @@ target_link_libraries(test_file_zstd PUBLIC
 add_library(message_fragment_store
 	./fragment_store/message_serializer.hpp
 	./fragment_store/message_serializer.cpp
+	./fragment_store/messages_meta_components.hpp
+	./fragment_store/messages_meta_components_id.inl
 	./fragment_store/message_fragment_store.hpp
 	./fragment_store/message_fragment_store.cpp
 
diff --git a/src/fragment_store/message_fragment_store.hpp b/src/fragment_store/message_fragment_store.hpp
index b23d054..ba2d7c0 100644
--- a/src/fragment_store/message_fragment_store.hpp
+++ b/src/fragment_store/message_fragment_store.hpp
@@ -7,6 +7,8 @@
 
 #include "./message_serializer.hpp"
 
+#include "./messages_meta_components.hpp"
+
 #include <entt/container/dense_map.hpp>
 #include <entt/container/dense_set.hpp>
 
@@ -54,33 +56,6 @@ namespace Message::Components {
 
 } // Message::Components
 
-namespace ObjectStore::Components {
-	struct MessagesVersion {
-		// messages Object version
-		// 1 -> text_json
-		uint16_t v {1};
-	};
-
-	struct MessagesTSRange {
-		// timestamp range within the fragment
-		uint64_t begin {0}; // newer msg -> higher number
-		uint64_t end {0};
-	};
-
-	struct MessagesContact {
-		std::vector<uint8_t> id;
-	};
-
-	// TODO: add src contact (self id)
-
-} // ObjectStore::Components
-
-// old
-namespace Fragment::Components {
-	struct MessagesTSRange : public ObjComp::MessagesTSRange {};
-	struct MessagesContact : public ObjComp::MessagesContact {};
-} // Fragment::Components
-
 // handles fragments for messages
 // on new message: assign fuid
 // on new and update: mark as fragment dirty
diff --git a/src/fragment_store/messages_meta_components.hpp b/src/fragment_store/messages_meta_components.hpp
new file mode 100644
index 0000000..d2ea019
--- /dev/null
+++ b/src/fragment_store/messages_meta_components.hpp
@@ -0,0 +1,33 @@
+#pragma once
+
+#include "./meta_components.hpp"
+
+namespace ObjectStore::Components {
+	struct MessagesVersion {
+		// messages Object version
+		// 1 -> text_json
+		uint16_t v {1};
+	};
+
+	struct MessagesTSRange {
+		// timestamp range within the fragment
+		uint64_t begin {0}; // newer msg -> higher number
+		uint64_t end {0};
+	};
+
+	struct MessagesContact {
+		std::vector<uint8_t> id;
+	};
+
+	// TODO: add src contact (self id)
+
+} // ObjectStore::Components
+
+// old
+namespace Fragment::Components {
+	struct MessagesTSRange : public ObjComp::MessagesTSRange {};
+	struct MessagesContact : public ObjComp::MessagesContact {};
+} // Fragment::Components
+
+#include "./messages_meta_components_id.inl"
+
diff --git a/src/fragment_store/messages_meta_components_id.inl b/src/fragment_store/messages_meta_components_id.inl
new file mode 100644
index 0000000..4713637
--- /dev/null
+++ b/src/fragment_store/messages_meta_components_id.inl
@@ -0,0 +1,31 @@
+#pragma once
+
+#include "./messages_meta_components.hpp"
+
+#include <entt/core/type_info.hpp>
+
+// TODO: move more central
+#define DEFINE_COMP_ID(x) \
+template<> \
+constexpr entt::id_type entt::type_hash<x>::value() noexcept { \
+	using namespace entt::literals; \
+	return #x##_hs; \
+} \
+template<> \
+constexpr std::string_view entt::type_name<x>::value() noexcept { \
+	return #x; \
+}
+
+// cross compiler stable ids
+
+DEFINE_COMP_ID(ObjComp::MessagesVersion)
+DEFINE_COMP_ID(ObjComp::MessagesTSRange)
+DEFINE_COMP_ID(ObjComp::MessagesContact)
+
+// old stuff
+//DEFINE_COMP_ID(FragComp::MessagesTSRange)
+//DEFINE_COMP_ID(FragComp::MessagesContact)
+
+#undef DEFINE_COMP_ID
+
+
diff --git a/src/fragment_store/meta_components.hpp b/src/fragment_store/meta_components.hpp
index f0dcf57..0363caa 100644
--- a/src/fragment_store/meta_components.hpp
+++ b/src/fragment_store/meta_components.hpp
@@ -1,7 +1,7 @@
 #pragma once
 
 #include "./types.hpp"
-#include "object_store.hpp"
+#include "./object_store.hpp"
 
 #include <vector>
 #include <string>
@@ -26,6 +26,7 @@ namespace ObjectStore::Components {
 	// meta that is not written to (meta-)file
 	namespace Ephemeral {
 
+		// TODO: move, backend specific
 		struct MetaFileType {
 			::MetaFileType type {::MetaFileType::TEXT_JSON};
 		};
@@ -61,7 +62,7 @@ namespace ObjectStore::Components {
 // shortened to save bytes (until I find a way to save by ID in msgpack)
 namespace ObjComp = ObjectStore::Components;
 
-// old names
+// old names from frag era
 namespace Fragment::Components {
 	//struct ID {};
 	//struct DataEncryptionType {};