diff --git a/App/.idea/sqlDataSources.xml b/App/.idea/sqlDataSources.xml
new file mode 100644
index 0000000..b125209
--- /dev/null
+++ b/App/.idea/sqlDataSources.xml
@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="SqlDataSourceStorage">
+    <option name="dataSources">
+      <list>
+        <State>
+          <option name="id" value="9b469808-a645-4c18-b66c-ba653aa374e1" />
+          <option name="name" value="DDL data source" />
+          <option name="urls">
+            <array>
+              <option value="file://$PROJECT_DIR$/db_script_pycharm.ddl" />
+            </array>
+          </option>
+        </State>
+      </list>
+    </option>
+  </component>
+</project>
\ No newline at end of file
diff --git a/App/.idea/workspace.xml b/App/.idea/workspace.xml
index 3d10e82..b30117d 100644
--- a/App/.idea/workspace.xml
+++ b/App/.idea/workspace.xml
@@ -2,11 +2,11 @@
 <project version="4">
   <component name="ChangeListManager">
     <list default="true" id="ecb85847-acff-4336-b3d7-4f5563aac01d" name="Default" comment="">
-      <change afterPath="$PROJECT_DIR$/commands/__init__.py" afterDir="false" />
-      <change afterPath="$PROJECT_DIR$/database/__init__.py" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/.idea/sqlDataSources.xml" afterDir="false" />
       <change beforePath="$PROJECT_DIR$/.idea/workspace.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/workspace.xml" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/application.py" beforeDir="false" afterPath="$PROJECT_DIR$/application.py" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/database/__init__.py" beforeDir="false" afterPath="$PROJECT_DIR$/database/__init__.py" afterDir="false" />
       <change beforePath="$PROJECT_DIR$/requirements.txt" beforeDir="false" afterPath="$PROJECT_DIR$/requirements.txt" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/../Design/DB_STRUCTURE/db_script.cql" beforeDir="false" afterPath="$PROJECT_DIR$/../Design/DB_STRUCTURE/db_script.cql" afterDir="false" />
     </list>
     <option name="EXCLUDED_CONVERTED_TO_IGNORED" value="true" />
     <option name="TRACKING_ENABLED" value="true" />
@@ -18,16 +18,79 @@
   <component name="CoverageDataManager">
     <SUITE FILE_PATH="coverage/App$application.coverage" NAME="application Coverage Results" MODIFIED="1529336246883" SOURCE_PROVIDER="com.intellij.coverage.DefaultCoverageFileProvider" RUNNER="coverage.py" COVERAGE_BY_TEST_ENABLED="true" COVERAGE_TRACING_ENABLED="false" WORKING_DIRECTORY="$PROJECT_DIR$" />
   </component>
+  <component name="DatabaseView">
+    <option name="SHOW_INTERMEDIATE" value="true" />
+    <option name="GROUP_DATA_SOURCES" value="true" />
+    <option name="GROUP_SCHEMA" value="true" />
+    <option name="GROUP_CONTENTS" value="false" />
+    <option name="SORT_POSITIONED" value="false" />
+    <option name="SHOW_EMPTY_GROUPS" value="false" />
+    <option name="AUTO_SCROLL_FROM_SOURCE" value="false" />
+    <option name="HIDDEN_KINDS">
+      <set />
+    </option>
+    <expand>
+      <path>
+        <item name="Database" type="3277223f:DatabaseStructure$DbRootGroup" />
+        <item name="DDL data source" type="feb32156:DbDataSourceImpl" />
+      </path>
+      <path>
+        <item name="Database" type="3277223f:DatabaseStructure$DbRootGroup" />
+        <item name="DDL data source" type="feb32156:DbDataSourceImpl" />
+        <item name="youtubemdapp: schema" type="c314c289:MysqlImplModel$Schema" />
+      </path>
+      <path>
+        <item name="Database" type="3277223f:DatabaseStructure$DbRootGroup" />
+        <item name="DDL data source" type="feb32156:DbDataSourceImpl" />
+        <item name="youtubemdapp: schema" type="c314c289:MysqlImplModel$Schema" />
+        <item name="history: table" type="98d5ac3d:MysqlImplModel$Table" />
+      </path>
+      <path>
+        <item name="Database" type="3277223f:DatabaseStructure$DbRootGroup" />
+        <item name="DDL data source" type="feb32156:DbDataSourceImpl" />
+        <item name="youtubemdapp: schema" type="c314c289:MysqlImplModel$Schema" />
+        <item name="metadata: table" type="98d5ac3d:MysqlImplModel$Table" />
+      </path>
+      <path>
+        <item name="Database" type="3277223f:DatabaseStructure$DbRootGroup" />
+        <item name="DDL data source" type="feb32156:DbDataSourceImpl" />
+        <item name="youtubemdapp: schema" type="c314c289:MysqlImplModel$Schema" />
+        <item name="music: table" type="98d5ac3d:MysqlImplModel$Table" />
+      </path>
+      <path>
+        <item name="Database" type="3277223f:DatabaseStructure$DbRootGroup" />
+        <item name="DDL data source" type="feb32156:DbDataSourceImpl" />
+        <item name="youtubemdapp: schema" type="c314c289:MysqlImplModel$Schema" />
+        <item name="playlist: table" type="98d5ac3d:MysqlImplModel$Table" />
+      </path>
+      <path>
+        <item name="Database" type="3277223f:DatabaseStructure$DbRootGroup" />
+        <item name="DDL data source" type="feb32156:DbDataSourceImpl" />
+        <item name="youtubemdapp: schema" type="c314c289:MysqlImplModel$Schema" />
+        <item name="playlist_has_music: table" type="98d5ac3d:MysqlImplModel$Table" />
+      </path>
+      <path>
+        <item name="Database" type="3277223f:DatabaseStructure$DbRootGroup" />
+        <item name="DDL data source" type="feb32156:DbDataSourceImpl" />
+        <item name="youtubemdapp: schema" type="c314c289:MysqlImplModel$Schema" />
+        <item name="preferences: table" type="98d5ac3d:MysqlImplModel$Table" />
+      </path>
+      <path>
+        <item name="Database" type="3277223f:DatabaseStructure$DbRootGroup" />
+        <item name="DDL data source" type="feb32156:DbDataSourceImpl" />
+        <item name="youtubemdapp: schema" type="c314c289:MysqlImplModel$Schema" />
+        <item name="User: table" type="98d5ac3d:MysqlImplModel$Table" />
+      </path>
+    </expand>
+    <select />
+  </component>
   <component name="FileEditorManager">
     <leaf SIDE_TABS_SIZE_LIMIT_KEY="300">
       <file leaf-file-name="application.py" pinned="false" current-in-tab="false">
         <entry file="file://$PROJECT_DIR$/application.py">
           <provider selected="true" editor-type-id="text-editor">
-            <state relative-caret-position="119">
+            <state relative-caret-position="102">
               <caret line="7" lean-forward="true" selection-start-line="7" selection-end-line="7" />
-              <folding>
-                <element signature="e#154#185#0" expanded="true" />
-              </folding>
             </state>
           </provider>
         </entry>
@@ -35,42 +98,15 @@
       <file leaf-file-name="__init__.py" pinned="false" current-in-tab="true">
         <entry file="file://$PROJECT_DIR$/database/__init__.py">
           <provider selected="true" editor-type-id="text-editor">
-            <state relative-caret-position="34">
-              <caret line="2" column="8" selection-start-line="2" selection-start-column="8" selection-end-line="2" selection-end-column="8" />
-            </state>
-          </provider>
-        </entry>
-      </file>
-      <file leaf-file-name="__init__.py" pinned="false" current-in-tab="false">
-        <entry file="file://$PROJECT_DIR$/commands/__init__.py">
-          <provider selected="true" editor-type-id="text-editor">
-            <state relative-caret-position="425">
-              <caret line="25" column="61" lean-forward="true" selection-start-line="25" selection-start-column="61" selection-end-line="25" selection-end-column="61" />
+            <state relative-caret-position="646">
+              <caret line="48" column="60" lean-forward="true" selection-start-line="48" selection-start-column="60" selection-end-line="48" selection-end-column="60" />
               <folding>
-                <element signature="e#0#32#0" expanded="true" />
+                <element signature="e#0#37#0" expanded="true" />
               </folding>
             </state>
           </provider>
         </entry>
       </file>
-      <file leaf-file-name="__init__.py" pinned="false" current-in-tab="false">
-        <entry file="file://$PROJECT_DIR$/upgrader/__init__.py">
-          <provider selected="true" editor-type-id="text-editor">
-            <state relative-caret-position="170">
-              <caret line="10" selection-start-line="10" selection-end-line="10" />
-            </state>
-          </provider>
-        </entry>
-      </file>
-      <file leaf-file-name="__init__.py" pinned="false" current-in-tab="false">
-        <entry file="file://$PROJECT_DIR$/out/__init__.py">
-          <provider selected="true" editor-type-id="text-editor">
-            <state relative-caret-position="374">
-              <caret line="22" selection-start-line="22" selection-end-line="22" />
-            </state>
-          </provider>
-        </entry>
-      </file>
     </leaf>
   </component>
   <component name="FileTemplateManagerImpl">
@@ -107,8 +143,9 @@
   </component>
   <component name="ProjectFrameBounds" extendedState="6">
     <option name="x" value="-9" />
-    <option name="width" value="978" />
-    <option name="height" value="1039" />
+    <option name="y" value="-9" />
+    <option name="width" value="977" />
+    <option name="height" value="1038" />
   </component>
   <component name="ProjectLevelVcsManager" settingsEditedManually="true">
     <ConfirmationsSetting value="2" id="Add" />
@@ -125,26 +162,11 @@
               <item name="App" type="b2602c69:ProjectViewProjectNode" />
               <item name="App" type="462c0819:PsiDirectoryNode" />
             </path>
-            <path>
-              <item name="App" type="b2602c69:ProjectViewProjectNode" />
-              <item name="App" type="462c0819:PsiDirectoryNode" />
-              <item name="commands" type="462c0819:PsiDirectoryNode" />
-            </path>
             <path>
               <item name="App" type="b2602c69:ProjectViewProjectNode" />
               <item name="App" type="462c0819:PsiDirectoryNode" />
               <item name="database" type="462c0819:PsiDirectoryNode" />
             </path>
-            <path>
-              <item name="App" type="b2602c69:ProjectViewProjectNode" />
-              <item name="App" type="462c0819:PsiDirectoryNode" />
-              <item name="out" type="462c0819:PsiDirectoryNode" />
-            </path>
-            <path>
-              <item name="App" type="b2602c69:ProjectViewProjectNode" />
-              <item name="App" type="462c0819:PsiDirectoryNode" />
-              <item name="upgrader" type="462c0819:PsiDirectoryNode" />
-            </path>
           </expand>
           <select />
         </subPane>
@@ -154,10 +176,11 @@
   </component>
   <component name="PropertiesComponent">
     <property name="WebServerToolWindowFactoryState" value="true" />
-    <property name="last_opened_file_path" value="$PROJECT_DIR$/requirements.txt" />
+    <property name="com.intellij.database.dataSource.DataSourceTemplate" value="DDL Data Source&#10;Derby (Embedded)" />
+    <property name="last_opened_file_path" value="$PROJECT_DIR$/db_script_pycharm.ddl" />
     <property name="nodejs_interpreter_path.stuck_in_default_project" value="undefined stuck path" />
     <property name="nodejs_npm_path_reset_for_default_project" value="true" />
-    <property name="settings.editor.selected.configurable" value="com.jetbrains.python.configuration.PyIntegratedToolsModulesConfigurable" />
+    <property name="settings.editor.selected.configurable" value="SQL Resolution Scopes" />
   </component>
   <component name="RunDashboard">
     <option name="ruleStates">
@@ -230,27 +253,43 @@
     <editor active="true" />
     <layout>
       <window_info anchor="bottom" id="TODO" order="12" />
-      <window_info anchor="bottom" id="Event Log" order="3" side_tool="true" />
+      <window_info anchor="bottom" id="Event Log" order="3" side_tool="true" weight="0.32965517" />
       <window_info anchor="bottom" id="Database Changes" order="2" show_stripe_button="false" />
       <window_info anchor="bottom" id="Version Control" order="1" />
-      <window_info anchor="bottom" id="Python Console" order="5" />
+      <window_info anchor="bottom" id="Python Console" order="5" weight="0.32965517" />
       <window_info anchor="bottom" id="Run" order="8" weight="0.32965517" />
       <window_info anchor="bottom" id="Terminal" order="4" />
       <window_info anchor="right" id="Remote Host" order="2" />
-      <window_info active="true" content_ui="combo" id="Project" order="1" visible="true" weight="0.26367188" />
+      <window_info content_ui="combo" id="Project" order="1" visible="true" weight="0.18945312" />
       <window_info anchor="bottom" id="Docker" order="0" show_stripe_button="false" />
-      <window_info anchor="right" id="Database" order="0" />
+      <window_info anchor="right" id="Database" order="0" weight="0.3294271" />
       <window_info anchor="bottom" id="Find" order="7" weight="0.32965517" />
       <window_info anchor="right" id="SciView" order="1" />
       <window_info id="Structure" order="2" side_tool="true" weight="0.25" />
       <window_info id="Favorites" order="0" side_tool="true" />
       <window_info anchor="bottom" id="Debug" order="9" weight="0.4" />
+      <window_info anchor="bottom" id="Debug" order="9" weight="0.4" />
       <window_info anchor="right" content_ui="combo" id="Hierarchy" order="5" weight="0.25" />
+      <window_info anchor="bottom" id="Docker" order="0" show_stripe_button="false" />
       <window_info anchor="bottom" id="Inspection" order="11" weight="0.4" />
+      <window_info anchor="right" id="Remote Host" order="2" />
+      <window_info active="true" content_ui="combo" id="Project" order="1" visible="true" weight="0.26367188" />
+      <window_info anchor="right" id="SciView" order="1" />
       <window_info anchor="right" id="Commander" order="3" weight="0.4" />
       <window_info anchor="right" id="Ant Build" order="4" weight="0.25" />
+      <window_info anchor="bottom" id="TODO" order="12" />
+      <window_info anchor="bottom" id="Version Control" order="1" />
+      <window_info anchor="bottom" id="Run" order="8" weight="0.32965517" />
+      <window_info anchor="bottom" id="Database Changes" order="2" show_stripe_button="false" />
+      <window_info id="Structure" order="2" side_tool="true" weight="0.25" />
+      <window_info anchor="right" id="Database" order="0" />
       <window_info anchor="bottom" id="Message" order="6" />
+      <window_info anchor="bottom" id="Event Log" order="3" side_tool="true" />
       <window_info anchor="bottom" id="Cvs" order="10" weight="0.25" />
+      <window_info id="Favorites" order="0" side_tool="true" />
+      <window_info anchor="bottom" id="Find" order="7" weight="0.32965517" />
+      <window_info anchor="bottom" id="Terminal" order="4" />
+      <window_info anchor="bottom" id="Python Console" order="5" />
     </layout>
   </component>
   <component name="TypeScriptGeneratedFilesManager">
@@ -331,18 +370,25 @@
     </entry>
     <entry file="file://$PROJECT_DIR$/application.py">
       <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="119">
+        <state relative-caret-position="102">
           <caret line="7" lean-forward="true" selection-start-line="7" selection-end-line="7" />
-          <folding>
-            <element signature="e#154#185#0" expanded="true" />
-          </folding>
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$USER_HOME$/.PyCharm2018.1/system/python_stubs/-272786505/builtins.py">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="233">
+          <caret line="778" column="8" selection-start-line="778" selection-start-column="8" selection-end-line="778" selection-end-column="8" />
         </state>
       </provider>
     </entry>
     <entry file="file://$PROJECT_DIR$/database/__init__.py">
       <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="34">
-          <caret line="2" column="8" selection-start-line="2" selection-start-column="8" selection-end-line="2" selection-end-column="8" />
+        <state relative-caret-position="646">
+          <caret line="48" column="60" lean-forward="true" selection-start-line="48" selection-start-column="60" selection-end-line="48" selection-end-column="60" />
+          <folding>
+            <element signature="e#0#37#0" expanded="true" />
+          </folding>
         </state>
       </provider>
     </entry>
diff --git a/App/database/__init__.py b/App/database/__init__.py
index 6122e79..cb6eac2 100644
--- a/App/database/__init__.py
+++ b/App/database/__init__.py
@@ -1,3 +1,49 @@
-class DatabaseOperations:
-    def __init__(self):
-        
\ No newline at end of file
+from cassandra.cluster import Cluster
+from cassandra.auth import PlainTextAuthProvider
+
+
+# Singleton class
+class DatabaseOperations(object):
+    __instance = None
+
+    def __new__(cls, username: str, password: str):
+        if DatabaseOperations.__instance is None:
+            DatabaseOperations.__instance = object.__new__(cls)
+        auth_provider = PlainTextAuthProvider(username=username, password=password)
+        cluster = Cluster(auth_provider=auth_provider)
+        DatabaseOperations.__instance.__session = cluster.connect()
+        DatabaseOperations.__instance.__createTables()
+        return DatabaseOperations.__instance
+
+    def __createTables(self):
+        with open("../../Design/db_script.cql", "r") as sql_script:
+            queries = sql_script.read().splitlines()
+            for query in queries:
+                self.__session.execute(query)
+
+    def registerNewUser(self, user_id: int, username: str, name: str):
+        query = """INSERT INTO YouTubeMDApp.User(user_id, username, name) VALUES (%s, %s, %s);"""
+        self.__session.execute(query, (user_id, username, name))
+
+    def registerPreferences(self, user_id: int, audio_quality: str, audio_format: str, os: str,
+                            should_ask_metadata: bool):
+        query = """
+        INSERT INTO YouTubeMDApp.preferences(audio_quality, audio_format, os, should_ask_metadata, user_id) 
+        VALUES (%s, %s, %s, %s, %s);
+        """
+        self.__session.execute(query, (audio_quality, audio_format, os, should_ask_metadata, user_id))
+
+    def registerStatistics(self, user_id: int, lang: str, downloads: int, last_time_active):
+        query = """
+        INSERT INTO YouTubeMDApp.Statistics(lang, downloads, last_time_active, user_id) VALUES (%s, %s, %s, %s);
+        """
+        self.__session.execute(query, (lang, downloads, last_time_active, user_id))
+
+    def registerNewSong(self, file_id: str, video_id: str, audio_quality: int, audio_format: int, times_requested: int,
+                        is_metadata_by_user: bool):
+        query = """
+        INSERT INTO YouTubeMDApp.music (file_id, video_id, audio_quality, audio_format, times_requested, 
+        is_metadata_by_user) VALUES (%s, %s, %s, %s, %s, %s)
+        """
+        self.__session.execute(query, (file_id, video_id, audio_quality, audio_format, times_requested,
+                                       is_metadata_by_user))
diff --git a/App/db_script_pycharm.ddl b/App/db_script_pycharm.ddl
new file mode 100644
index 0000000..3c24d37
--- /dev/null
+++ b/App/db_script_pycharm.ddl
@@ -0,0 +1,10 @@
+CREATE KEYSPACE IF NOT EXISTS YouTubeMDApp WITH replication = {'class': 'SimpleStrategy', 'replication_factor': 3};
+USE YouTubeMDApp;
+CREATE TABLE IF NOT EXISTS history (user_id int NOT NULL, file_id varchar NOT NULL);
+CREATE TABLE IF NOT EXISTS metadata (title varchar, artist varchar, cover text, duration varchar, music_file_id varchar NOT NULL, PRIMARY KEY (music_file_id));
+CREATE TABLE IF NOT EXISTS music (file_id varchar NOT NULL,video_id varchar, audio_quality int, audio_format int, times_requested int, is_metadata_by_user boolean, PRIMARY KEY (file_id));
+CREATE TABLE IF NOT EXISTS playlist (playlist_id varchar NOT NULL, number_elements int, times_requested int, PRIMARY KEY (playlist_id));
+CREATE TABLE IF NOT EXISTS playlist_has_music (playlist_playlist_id varchar NOT NULL, music_file_id varchar NOT NULL);
+CREATE TABLE IF NOT EXISTS preferences (audio_quality varchar, audio_format varchar, os varchar, should_ask_metadata boolean, user_id int NOT NULL, PRIMARY KEY (user_id));
+CREATE TABLE IF NOT EXISTS "User" (user_id int NOT NULL, username varchar, name text, PRIMARY KEY (user_id));
+CREATE TABLE IF NOT EXISTS Statistics (lang varchar, downloads int, last_time_active datetime, user_id int NOT NULL, PRIMARY KEY(user_id));
\ No newline at end of file
diff --git a/App/requirements.txt b/App/requirements.txt
index 2861b8a..d948e9a 100644
--- a/App/requirements.txt
+++ b/App/requirements.txt
@@ -1,3 +1,4 @@
+cassandra-driver
 telegram
 pip
 python-telegram-bot
diff --git a/Design/DB_STRUCTURE/db_script.cql b/Design/DB_STRUCTURE/db_script.cql
index 6310f30..3c24d37 100644
--- a/Design/DB_STRUCTURE/db_script.cql
+++ b/Design/DB_STRUCTURE/db_script.cql
@@ -1,55 +1,10 @@
-CREATE KEYSPACE IF NOT EXISTS YouTubeMDApp
-    WITH replication = {'class': 'SimpleStrategy', 'replication_factor': 3}
-
-
-CREATE TABLE IF NOT EXISTS history (
-    user_id    int NOT NULL,
-    file_id    varchar NOT NULL
-);
-
-CREATE TABLE IF NOT EXISTS metadata (
-    title           varchar,
-    artist          varchar,
-    cover           text,
-    duration        varchar,
-    music_file_id   varchar NOT NULL,
-    PRIMARY KEY (music_file_id)
-);
-
-CREATE TABLE IF NOT EXISTS music (
-    file_id               varchar NOT NULL,
-    video_id              varchar,
-    audio_quality         int,
-    audio_format          int,
-    times_requested       int,
-    is_metadata_by_user   boolean,
-    PRIMARY KEY (file_id)
-);
-
-CREATE TABLE IF NOT EXISTS playlist (
-    playlist_id       varchar NOT NULL,
-    number_elements   int,
-    times_requested   int,
-    PRIMARY KEY (playlist_id)
-);
-
-CREATE TABLE IF NOT EXISTS playlist_has_music (
-    playlist_playlist_id   varchar NOT NULL,
-    music_file_id          varchar NOT NULL
-);
-
-CREATE TABLE IF NOT EXISTS preferences (
-    audio_quality         varchar,
-    audio_format          varchar,
-    os                    varchar,
-    should_ask_metadata   boolean,
-    user_id               int NOT NULL,
-    PRIMARY KEY (user_id)
-);
-
-CREATE TABLE IF NOT EXISTS "User" (
-    user_id    int NOT NULL,
-    username   varchar,
-    name       text,
-    PRIMARY KEY (user_id)
-);
\ No newline at end of file
+CREATE KEYSPACE IF NOT EXISTS YouTubeMDApp WITH replication = {'class': 'SimpleStrategy', 'replication_factor': 3};
+USE YouTubeMDApp;
+CREATE TABLE IF NOT EXISTS history (user_id int NOT NULL, file_id varchar NOT NULL);
+CREATE TABLE IF NOT EXISTS metadata (title varchar, artist varchar, cover text, duration varchar, music_file_id varchar NOT NULL, PRIMARY KEY (music_file_id));
+CREATE TABLE IF NOT EXISTS music (file_id varchar NOT NULL,video_id varchar, audio_quality int, audio_format int, times_requested int, is_metadata_by_user boolean, PRIMARY KEY (file_id));
+CREATE TABLE IF NOT EXISTS playlist (playlist_id varchar NOT NULL, number_elements int, times_requested int, PRIMARY KEY (playlist_id));
+CREATE TABLE IF NOT EXISTS playlist_has_music (playlist_playlist_id varchar NOT NULL, music_file_id varchar NOT NULL);
+CREATE TABLE IF NOT EXISTS preferences (audio_quality varchar, audio_format varchar, os varchar, should_ask_metadata boolean, user_id int NOT NULL, PRIMARY KEY (user_id));
+CREATE TABLE IF NOT EXISTS "User" (user_id int NOT NULL, username varchar, name text, PRIMARY KEY (user_id));
+CREATE TABLE IF NOT EXISTS Statistics (lang varchar, downloads int, last_time_active datetime, user_id int NOT NULL, PRIMARY KEY(user_id));
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