diff --git a/src/backends/postgresql/delete.cpp b/src/backends/postgresql/delete.cpp
index a87fda4..ee50a74 100644
--- a/src/backends/postgresql/delete.cpp
+++ b/src/backends/postgresql/delete.cpp
@@ -29,7 +29,7 @@
 
 namespace dindb {
 	namespace {
-		IDDescMap fetch_existing_ids (pq::Connection& parConn, const std::vector<uint32_t>& parIDs) {
+		IDDescMap fetch_existing_ids (pq::Connection& parConn, const std::vector<GroupIDType>& parIDs) {
 			using boost::lexical_cast;
 
 			IDDescMap retmap;
@@ -39,7 +39,7 @@ namespace dindb {
 
 			std::ostringstream oss;
 			oss << "SELECT \"id\",\"desc\" FROM \"sets\" WHERE \"id\"=";
-			boost::copy(parIDs, infix_ostream_iterator<uint32_t>(oss, " OR \"id\"="));
+			boost::copy(parIDs, infix_ostream_iterator<GroupIDType>(oss, " OR \"id\"="));
 			oss << ';';
 
 			auto resultset = parConn.query(oss.str());
@@ -50,7 +50,7 @@ namespace dindb {
 		}
 	} //unnamed namespace
 
-	void delete_group_from_db (pq::Connection& parDB, const std::vector<uint32_t>& parIDs, ConfirmDeleCallback parConf) {
+	void delete_group_from_db (pq::Connection& parDB, const std::vector<GroupIDType>& parIDs, ConfirmDeleCallback parConf) {
 		assert(parDB.is_connected());
 
 		const auto dele_ids = fetch_existing_ids(parDB, parIDs);
@@ -65,9 +65,9 @@ namespace dindb {
 		ids.reserve(dele_ids.size());
 		std::ostringstream oss;
 		oss << "BEGIN;\nDELETE FROM \"files\" WHERE \"group_id\"=";
-		boost::copy(dele_ids | boost::adaptors::map_keys, infix_ostream_iterator<uint32_t>(oss, " OR \"group_id\"="));
+		boost::copy(dele_ids | boost::adaptors::map_keys, infix_ostream_iterator<GroupIDType>(oss, " OR \"group_id\"="));
 		oss << ";\nDELETE FROM \"sets\" WHERE \"id\"=";
-		boost::copy(dele_ids | boost::adaptors::map_keys, infix_ostream_iterator<uint32_t>(oss, " OR \"id\"="));
+		boost::copy(dele_ids | boost::adaptors::map_keys, infix_ostream_iterator<GroupIDType>(oss, " OR \"id\"="));
 		oss << ";\nCOMMIT;";
 
 		parDB.query(oss.str());
diff --git a/src/backends/postgresql/delete.hpp b/src/backends/postgresql/delete.hpp
index 341cc47..befe62a 100644
--- a/src/backends/postgresql/delete.hpp
+++ b/src/backends/postgresql/delete.hpp
@@ -22,7 +22,6 @@
 #include <functional>
 #include <vector>
 #include <string>
-#include <cstdint>
 #include <map>
 
 namespace pq {
@@ -30,10 +29,10 @@ namespace pq {
 } //namespace pq
 
 namespace dindb {
-	using IDDescMap = std::map<uint32_t, std::string>;
+	using IDDescMap = std::map<GroupIDType, std::string>;
 	using ConfirmDeleCallback = std::function<bool(const IDDescMap&)>;
 
-	void delete_group_from_db ( pq::Connection& parDB, const std::vector<uint32_t>& parIDs, ConfirmDeleCallback parConf );
+	void delete_group_from_db ( pq::Connection& parDB, const std::vector<GroupIDType>& parIDs, ConfirmDeleCallback parConf );
 } //namespace dindb
 
 #endif
diff --git a/src/backends/redis/backend_redis.cpp b/src/backends/redis/backend_redis.cpp
index 711d1b9..34e4912 100644
--- a/src/backends/redis/backend_redis.cpp
+++ b/src/backends/redis/backend_redis.cpp
@@ -148,7 +148,7 @@ namespace dindb {
 		dindb::delete_all_tags(m_redis, m_dele_tag_if_in_set, parRegexes, parSet);
 	}
 
-	void BackendRedis::delete_group (const std::vector<uint32_t>& parIDs, ConfirmDeleCallback parConf) {
+	void BackendRedis::delete_group (const std::vector<GroupIDType>& parIDs, ConfirmDeleCallback parConf) {
 	}
 
 	void BackendRedis::write_files (const std::vector<mchlib::FileRecordData>& parData, const mchlib::SetRecordDataFull& parSetData, const std::string& parSignature) {
diff --git a/src/backends/redis/backend_redis.hpp b/src/backends/redis/backend_redis.hpp
index be03011..bd24782 100644
--- a/src/backends/redis/backend_redis.hpp
+++ b/src/backends/redis/backend_redis.hpp
@@ -42,7 +42,7 @@ namespace dindb {
 		virtual void delete_all_tags ( const std::vector<FileIDType>& parFiles, GroupIDType parSet ) override;
 		virtual void delete_all_tags ( const std::vector<std::string>& parRegexes, GroupIDType parSet ) override;
 
-		virtual void delete_group ( const std::vector<uint32_t>& parIDs, ConfirmDeleCallback parConf ) override;
+		virtual void delete_group ( const std::vector<GroupIDType>& parIDs, ConfirmDeleCallback parConf ) override;
 
 		virtual void write_files ( const std::vector<mchlib::FileRecordData>& parData, const mchlib::SetRecordDataFull& parSetData, const std::string& parSignature ) override;
 		virtual bool search_file_by_hash ( mchlib::FileRecordData& parItem, mchlib::SetRecordDataFull& parSet, const mchlib::TigerHash& parHash ) override;
diff --git a/src/backends/redis/tag.cpp b/src/backends/redis/tag.cpp
index e979c64..9af54cb 100644
--- a/src/backends/redis/tag.cpp
+++ b/src/backends/redis/tag.cpp
@@ -37,7 +37,7 @@ namespace std {
 
 namespace dindb {
 	namespace {
-		std::string make_file_key (uint64_t parID) {
+		std::string make_file_key (FileIDType parID) {
 			return PROGRAM_NAME ":file:" + dinhelp::lexical_cast<std::string>(parID);
 		}
 
@@ -54,7 +54,7 @@ namespace dindb {
 			return retval;
 		}
 
-		void run_id_based_script (redis::Command& parRedis, redis::Script& parScript, const std::vector<uint64_t>& parFiles, const std::vector<boost::string_ref>& parTags, GroupIDType parSet) {
+		void run_id_based_script (redis::Command& parRedis, redis::Script& parScript, const std::vector<FileIDType>& parFiles, const std::vector<boost::string_ref>& parTags, GroupIDType parSet) {
 			using dinhelp::lexical_cast;
 
 			auto batch = parRedis.make_batch();
@@ -105,7 +105,7 @@ namespace dindb {
 		}
 	} //unnamed namespace
 
-	void tag_files (redis::Command& parRedis, redis::Script& parTagIfInSet, const std::vector<uint64_t>& parFiles, const std::vector<boost::string_ref>& parTags, GroupIDType parSet) {
+	void tag_files (redis::Command& parRedis, redis::Script& parTagIfInSet, const std::vector<FileIDType>& parFiles, const std::vector<boost::string_ref>& parTags, GroupIDType parSet) {
 		run_id_based_script(parRedis, parTagIfInSet, parFiles, parTags, parSet);
 	}
 
@@ -113,7 +113,7 @@ namespace dindb {
 		run_regex_based_script(parRedis, parTagIfInSet, parRegexes, parTags, parSet);
 	}
 
-	void delete_tags (redis::Command& parRedis, redis::Script& parDeleIfInSet, const std::vector<uint64_t>& parFiles, const std::vector<boost::string_ref>& parTags, GroupIDType parSet) {
+	void delete_tags (redis::Command& parRedis, redis::Script& parDeleIfInSet, const std::vector<FileIDType>& parFiles, const std::vector<boost::string_ref>& parTags, GroupIDType parSet) {
 		run_id_based_script(parRedis, parDeleIfInSet, parFiles, parTags, parSet);
 	}
 
@@ -121,7 +121,7 @@ namespace dindb {
 		run_regex_based_script(parRedis, parDeleIfInSet, parRegexes, parTags, parSet);
 	}
 
-	void delete_all_tags (redis::Command& parRedis, redis::Script& parDeleIfInSet, const std::vector<uint64_t>& parFiles, GroupIDType parSet) {
+	void delete_all_tags (redis::Command& parRedis, redis::Script& parDeleIfInSet, const std::vector<FileIDType>& parFiles, GroupIDType parSet) {
 		auto batch = parRedis.make_batch();
 		for (const auto file_id : parFiles) {
 			const auto file_key = make_file_key(file_id);
@@ -147,7 +147,7 @@ namespace dindb {
 		const auto regexes = compile_regexes(parRegexes);
 
 		std::set<std::string> dele_tags;
-		std::vector<uint64_t> ids;
+		std::vector<FileIDType> ids;
 
 		for (const auto& itm : parRedis.scan(PROGRAM_NAME ":file:*")) {
 			const auto& file_key = itm;
diff --git a/src/backends/redis/tag.hpp b/src/backends/redis/tag.hpp
index 1b4b55b..93c6962 100644
--- a/src/backends/redis/tag.hpp
+++ b/src/backends/redis/tag.hpp
@@ -21,7 +21,6 @@
 #include "backends/db_backend.hpp"
 #include <vector>
 #include <boost/utility/string_ref.hpp>
-#include <cstdint>
 
 namespace redis {
 	class Command;
@@ -32,7 +31,7 @@ namespace dindb {
 	void tag_files (
 		redis::Command& parRedis,
 		redis::Script& parTagIfInSet,
-		const std::vector<uint64_t>& parFiles,
+		const std::vector<FileIDType>& parFiles,
 		const std::vector<boost::string_ref>& parTags,
 		GroupIDType parSet
 	);
@@ -47,7 +46,7 @@ namespace dindb {
 	void delete_tags (
 		redis::Command& parRedis,
 		redis::Script& parDeleIfInSet,
-		const std::vector<uint64_t>& parFiles,
+		const std::vector<FileIDType>& parFiles,
 		const std::vector<boost::string_ref>& parTags,
 		GroupIDType parSet
 	);
@@ -61,7 +60,7 @@ namespace dindb {
 	void delete_all_tags (
 		redis::Command& parRedis,
 		redis::Script& parDeleIfInSet,
-		const std::vector<uint64_t>& parFiles,
+		const std::vector<FileIDType>& parFiles,
 		GroupIDType parSet
 	);
 	void delete_all_tags (