diff --git a/CMakeLists.txt b/CMakeLists.txt
index e02d771..aaebeb5 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -15,7 +15,7 @@ find_package(Qt6 COMPONENTS Core Gui Widgets Network Sql WebEngineWidgets REQUIR
 # Include directories
 include_directories(${PROJECT_SOURCE_DIR}/src)
 
-# Source files - we will add them later
+# Source files
 set(SRC_FILES
     src/main.cpp
     src/core/translator.cpp
@@ -24,6 +24,7 @@ set(SRC_FILES
     src/core/models/folder.cpp
     src/services/synchronizer.cpp
     src/services/imap/imapsynchronizer.cpp
+    src/db/databasemanager.cpp
 )
 
 # Executable
@@ -37,4 +38,4 @@ target_link_libraries(wino-mail-qt PRIVATE Qt6::Core Qt6::Gui Qt6::Widgets Qt6::
 # target_include_directories(wino-mail-qt PRIVATE ${LIBETPAN_INCLUDE_DIRS} ${GMIME_INCLUDE_DIRS})
 
 # Install (optional)
-install(TARGETS wino-mail-qt DESTINATION bin)
\ No newline at end of file
+install(TARGETS wino-mail-qt DESTINATION bin)
diff --git a/src/db/databasemanager.cpp b/src/db/databasemanager.cpp
new file mode 100644
index 0000000..d1970bc
--- /dev/null
+++ b/src/db/databasemanager.cpp
@@ -0,0 +1,131 @@
+#include "databasemanager.h"
+#include <QSqlQuery>
+#include <QSqlError>
+#include <QDebug>
+#include <QStandardPaths>
+#include <QDir>
+
+DatabaseManager& DatabaseManager::instance()
+{
+    static DatabaseManager instance;
+    return instance;
+}
+
+DatabaseManager::DatabaseManager() = default;
+
+DatabaseManager::~DatabaseManager()
+{
+    if (m_db.isOpen()) {
+        m_db.close();
+    }
+}
+
+bool DatabaseManager::initialize(const QString& databasePath)
+{
+    QMutexLocker locker(&m_mutex);
+    if (m_initialized) {
+        return true;
+    }
+
+    QString dbPath = databasePath;
+    if (dbPath.isEmpty()) {
+        // Use application data location
+        QDir dir(QStandardPaths::writableLocation(QStandardPaths::AppDataLocation));
+        if (!dir.exists()) {
+            dir.mkpath(".");
+        }
+        dbPath = dir.filePath("wino-mail.sqlite");
+    }
+
+    m_db = QSqlDatabase::addDatabase("QSQLITE", "wino_mail_connection");
+    m_db.setDatabaseName(dbPath);
+
+    if (!m_db.open()) {
+        qWarning() << "Failed to open database:" << m_db.lastError().text();
+        return false;
+    }
+
+    // Create tables if they don't exist
+    QSqlQuery query(m_db);
+    // We'll create a minimal set of tables for now; can be expanded later.
+    // Based on Wino Mail schema: Account, Folder, MailCopy (mail items), etc.
+
+    // Account table
+    if (!query.exec(
+        "CREATE TABLE IF NOT EXISTS Account ("
+        "id INTEGER PRIMARY KEY AUTOINCREMENT, "
+        "email TEXT NOT NULL, "
+        "displayName TEXT, "
+        "type INTEGER NOT NULL, " // 0=Outlook,1=Gmail,2=IMAP
+        "accessToken TEXT, "
+        "refreshToken TEXT, "
+        "tokenExpires DATETIME"
+        ");")) {
+        qWarning() << "Failed to create Account table:" << query.lastError().text();
+        return false;
+    }
+
+    // Folder table
+    if (!query.exec(
+        "CREATE TABLE IF NOT EXISTS Folder ("
+        "id INTEGER PRIMARY KEY AUTOINCREMENT, "
+        "accountId INTEGER NOT NULL, "
+        "name TEXT NOT NULL, "
+        "parentFolderId TEXT, "
+        "isInbox BOOLEAN DEFAULT 0, "
+        "isSent BOOLEAN DEFAULT 0, "
+        "isDrafts BOOLEAN DEFAULT 0, "
+        "isTrash BOOLEAN DEFAULT 0, "
+        "unreadCount INTEGER DEFAULT 0, "
+        "lastSynced DATETIME, "
+        "FOREIGN KEY(accountId) REFERENCES Account(id)"
+        ");")) {
+        qWarning() << "Failed to create Folder table:" << query.lastError().text();
+        return false;
+    }
+
+    // MailCopy table (simplified)
+    if (!query.exec(
+        "CREATE TABLE IF NOT EXISTS MailCopy ("
+        "id INTEGER PRIMARY KEY AUTOINCREMENT, "
+        "folderId INTEGER NOT NULL, "
+        "messageId TEXT UNIQUE, "
+        "subject TEXT, "
+        "sender TEXT, "
+        "recipient TEXT, "
+        "date DATETIME, "
+        "read BOOLEAN DEFAULT 0, "
+        "flagged BOOLEAN DEFAULT 0, "
+        "hasAttachment BOOLEAN DEFAULT 0, "
+        "size INTEGER, "
+        "fileId TEXT, " // references the .eml file in storage
+        "FOREIGN KEY(folderId) REFERENCES Folder(id)"
+        ");")) {
+        qWarning() << "Failed to create MailCopy table:" << query.lastError().text();
+        return false;
+    }
+
+    // Attachments table (optional)
+    if (!query.exec(
+        "CREATE TABLE IF NOT EXISTS Attachment ("
+        "id INTEGER PRIMARY KEY AUTOINCREMENT, "
+        "mailCopyId INTEGER NOT NULL, "
+        "filename TEXT, "
+        "mimeType TEXT, "
+        "size INTEGER, "
+        "contentId TEXT, "
+        "FOREIGN KEY(mailCopyId) REFERENCES MailCopy(id)"
+        ");")) {
+        qWarning() << "Failed to create Attachment table:" << query.lastError().text();
+        return false;
+    }
+
+    m_initialized = true;
+    qDebug() << "Database initialized at:" << dbPath;
+    return true;
+}
+
+QSqlDatabase& DatabaseManager::database()
+{
+    return m_db;
+}
\ No newline at end of file
diff --git a/src/db/databasemanager.h b/src/db/databasemanager.h
new file mode 100644
index 0000000..d23f919
--- /dev/null
+++ b/src/db/databasemanager.h
@@ -0,0 +1,23 @@
+#pragma once
+
+#include <QSqlDatabase>
+#include <QString>
+#include <QMutex>
+
+class DatabaseManager
+{
+public:
+    static DatabaseManager& instance();
+    ~DatabaseManager();
+
+    bool initialize(const QString& databasePath = QStringLiteral("wino-mail.sqlite"));
+    QSqlDatabase& database();
+
+private:
+    DatabaseManager();
+    Q_DISABLE_COPY(DatabaseManager)
+
+    QSqlDatabase m_db;
+    QMutex m_mutex;
+    bool m_initialized{false};
+};
\ No newline at end of file