diff --git a/.env.example b/.env.example
index 0dfeac3..176746a 100644
--- a/.env.example
+++ b/.env.example
@@ -1,9 +1,13 @@
-MYSQL_HOST=<mysql-host>
-MYSQL_PORT=<mysql-port>
-MYSQL_DATABASE=<mysql-database>
-MYSQL_USER=<mysql-user>
-MYSQL_PASSWORD=<mysql-password>
+# MYSQL Database
+MYSQL_HOST=
+MYSQL_PORT=
+MYSQL_DATABASE=
+MYSQL_USER=
+MYSQL_PASSWORD=
 
-BOT_API_KEY=<bot-api-key>
+# Telegram bot api key
+BOT_API_KEY=
 
-SECRET_KEY=<flask-secret-key>
+
+# Flask secret key
+SECRET_KEY=
diff --git a/.gitignore b/.gitignore
index bc8a670..f5f8f89 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,2 @@
-.idea/*
\ No newline at end of file
+.idea/*
+.env
\ No newline at end of file
diff --git a/telegram_bot/Dockerfile b/telegram_bot/Dockerfile
index 2cef589..df6b0ce 100644
--- a/telegram_bot/Dockerfile
+++ b/telegram_bot/Dockerfile
@@ -1,6 +1,7 @@
 FROM python:3.10-alpine
 
 WORKDIR /srv/flask_app
+RUN apk add build-base jpeg-dev zlib-dev musl-dev linux-headers g++
 
 COPY telegram_bot/requirements.txt /srv/flask_app/
 
diff --git a/webservice/api_blueprint_portfolio.py b/webservice/api_blueprint_portfolio.py
index f8a715a..6ee8a37 100644
--- a/webservice/api_blueprint_portfolio.py
+++ b/webservice/api_blueprint_portfolio.py
@@ -24,7 +24,7 @@ def get_portfolio():
         for row in transactions:
             if row.symbol in return_portfolio:
                 return_portfolio[row.symbol]['count'] += row.count
-                return_portfolio[row.symbol]['last_transaction'] += row.time
+                return_portfolio[row.symbol]['last_transaction'] = row.time
             else:
                 return_portfolio[row.symbol] = {"count": row.count, "last_transaction": row.time}