Fixed 'remember me' login option for several LMS instances on the same host, fixes #867

src/libs/database/CMakeLists.txt

@@ -24,6 +24,7 @@ add_library(lmsdatabase STATIC
 	impl/objects/RatedTrack.cpp
 	impl/objects/Release.cpp
 	impl/objects/ScanSettings.cpp
+	impl/objects/ServerInfo.cpp
 	impl/objects/StarredArtist.cpp
 	impl/objects/StarredRelease.cpp
 	impl/objects/StarredTrack.cpp

src/libs/database/impl/Migration.cpp

@@ -36,7 +36,7 @@ namespace lms::db
 {
     namespace
     {
-        static constexpr Version LMS_DATABASE_VERSION{ 109 };
+        static constexpr Version LMS_DATABASE_VERSION{ 110 };
     }
 
     VersionInfo::VersionInfo()
@@ -1956,6 +1956,16 @@ CREATE TABLE IF NOT EXISTS "track_movement" (
         utils::executeCommand(*session.getDboSession(), "UPDATE scan_settings SET audio_scan_version = audio_scan_version + 1");
     }
 
+    void migrateFromV109(Session& session)
+    {
+        utils::executeCommand(*session.getDboSession(), R"(
+CREATE TABLE IF NOT EXISTS "server_info" (
+  "id" integer primary key autoincrement,
+  "version" integer not null,
+  "instance_id" blob not null
+))");
+    }
+
     bool doDbMigration(Session& session)
     {
         constexpr std::string_view outdatedMsg{ "Outdated database, please rebuild it (delete the .db file and restart)" };
@@ -2041,6 +2051,7 @@ CREATE TABLE IF NOT EXISTS "track_movement" (
             { 106, migrateFromV106 },
             { 107, migrateFromV107 },
             { 108, migrateFromV108 },
+            { 109, migrateFromV109 },
         };
 
         LMS_SCOPED_TRACE_OVERVIEW("Database", "Migration");

src/libs/database/impl/Session.cpp

@@ -49,6 +49,7 @@
 #include "database/objects/Release.hpp"
 #include "database/objects/ReleaseArtistLink.hpp"
 #include "database/objects/ScanSettings.hpp"
+#include "database/objects/ServerInfo.hpp"
 #include "database/objects/StarredArtist.hpp"
 #include "database/objects/StarredRelease.hpp"
 #include "database/objects/StarredTrack.hpp"
@@ -125,6 +126,7 @@ namespace lms::db
         _session.mapClass<UIState>("ui_state");
         _session.mapClass<Work>("work");
         _session.mapClass<User>("user");
+        _session.mapClass<ServerInfo>("server_info");
         _session.mapClass<VersionInfo>("version_info");
     }
 
@@ -191,6 +193,13 @@ namespace lms::db
             create<ScanSettings>().modify()->setRecommendationEngineType(defaultRecommendationEngineType);
     }
 
+    void Session::createServerInfoIfNeeded()
+    {
+        auto uniqueTransaction{ createWriteTransaction() };
+
+        ServerInfo::getOrCreate(*this);
+    }
+
     void Session::createIndexesIfNeeded()
     {
         LMS_SCOPED_TRACE_OVERVIEW("Database", "IndexCreation");

src/libs/database/impl/objects/ServerInfo.cpp

@@ -0,0 +1,56 @@
+/*
+ * Copyright (C) 2026 Emeric Poupon
+ *
+ * This file is part of LMS.
+ *
+ * LMS is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * LMS is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with LMS.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "database/objects/ServerInfo.hpp"
+
+#include <Wt/Dbo/Impl.h>
+#include <Wt/Dbo/WtSqlTraits.h>
+
+#include "database/Session.hpp"
+
+#include "Utils.hpp"
+#include "traits/UUIDTraits.hpp"
+
+DBO_INSTANTIATE_TEMPLATES(lms::db::ServerInfo)
+
+namespace lms::db
+{
+    ServerInfo::ServerInfo(core::UUID instanceId)
+        : _instanceId{ instanceId }
+    {
+    }
+
+    ServerInfo::pointer ServerInfo::getOrCreate(Session& session)
+    {
+        session.checkWriteTransaction();
+
+        pointer serverInfo{ utils::fetchQuerySingleResult(session.getDboSession()->find<ServerInfo>()) };
+        if (!serverInfo)
+            return session.getDboSession()->add(std::unique_ptr<ServerInfo>{ new ServerInfo{ core::UUID::generate() } });
+
+        return serverInfo;
+    }
+
+    ServerInfo::pointer ServerInfo::get(Session& session)
+    {
+        session.checkReadTransaction();
+
+        return utils::fetchQuerySingleResult(session.getDboSession()->find<ServerInfo>());
+    }
+} // namespace lms::db

src/libs/database/include/database/Session.hpp

@@ -60,6 +60,7 @@ namespace lms::db
         void prepareTablesIfNeeded(); // need to run only once at startup
         bool migrateSchemaIfNeeded(); // returns true if migration was performed
         void createScanSettingsIfNeeded(RecommendationEngineType defaultRecommendationEngineType = RecommendationEngineType::Clusters);
+        void createServerInfoIfNeeded();
         void createIndexesIfNeeded();
         void vacuumIfNeeded();
         void vacuum();

src/libs/database/include/database/objects/ServerInfo.hpp

@@ -0,0 +1,54 @@
+/*
+ * Copyright (C) 2026 Emeric Poupon
+ *
+ * This file is part of LMS.
+ *
+ * LMS is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * LMS is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with LMS.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include <Wt/Dbo/Field.h>
+
+#include "core/UUID.hpp"
+
+namespace lms::db
+{
+    class Session;
+
+    // Singleton row holding server-level metadata (not tied to any particular schema version)
+    class ServerInfo
+    {
+    public:
+        using pointer = Wt::Dbo::ptr<ServerInfo>;
+
+        ServerInfo() = default;
+
+        static pointer getOrCreate(Session& session);
+        static pointer get(Session& session);
+
+        core::UUID getInstanceId() const { return _instanceId; }
+
+        template<class Action>
+        void persist(Action& a)
+        {
+            Wt::Dbo::field(a, _instanceId, "instance_id");
+        }
+
+    private:
+        explicit ServerInfo(core::UUID instanceId);
+
+        core::UUID _instanceId;
+    };
+} // namespace lms::db

src/libs/database/test/Migration.cpp

@@ -37,6 +37,7 @@
 #include "database/objects/RatedTrack.hpp"
 #include "database/objects/ReleaseArtistLink.hpp"
 #include "database/objects/ScanSettings.hpp"
+#include "database/objects/ServerInfo.hpp"
 #include "database/objects/StarredArtist.hpp"
 #include "database/objects/StarredRelease.hpp"
 #include "database/objects/StarredTrack.hpp"
@@ -345,6 +346,7 @@ VALUES
         // Now perform full migration
         db.getTLSSession().migrateSchemaIfNeeded();
         db.getTLSSession().createScanSettingsIfNeeded();
+        db.getTLSSession().createServerInfoIfNeeded();
 
         // Now perform some dummy finds to ensure all fields are correctly mapped
         {
@@ -374,6 +376,7 @@ VALUES
             EXPECT_FALSE(ReleaseArtistLink::find(session, ReleaseArtistLinkId{}));
             EXPECT_FALSE(ReleaseType::find(session, ReleaseTypeId{}));
             EXPECT_FALSE(ScanSettings::find(session, ScanSettingsId{}));
+            EXPECT_NE(ServerInfo::get(session)->getInstanceId(), core::UUID{});
             EXPECT_FALSE(StarredArtist::find(session, StarredArtistId{}));
             EXPECT_FALSE(StarredRelease::find(session, StarredReleaseId{}));
             EXPECT_FALSE(StarredTrack::find(session, StarredTrackId{}));