diff --git a/etc/TODO.md b/etc/TODO.md
index 74e7c4fc6a475382ead0547e7167ee3b6c5de91c..2af000d82e4072452faa8a1469be752489345d96 100644
--- a/etc/TODO.md
+++ b/etc/TODO.md
@@ -46,4 +46,13 @@
 * Fixed #41 SQLalchemy instead of SQL: EcdcImport.get_countries_of_continent()
 * Fixed #107 SQLalchemy instead of SQL in: EcdcImport.get_countries_of_continent
 * Fixed #109 SQLalchemy instead of SQL in: EcdcImport.get_date_rep
-* Fixed #110 SQLalchemy instead of SQL in: EcdcImport.get_continent
\ No newline at end of file
+* Fixed #110 SQLalchemy instead of SQL in: EcdcImport.get_continent
+
+### Research
+* add Flask-Caching https://pypi.org/project/Flask-Caching/
+* add Flask-Monitoring https://pypi.org/project/Flask-Monitoring/
+* add Flask-Redisboard https://pypi.org/project/Flask-Redisboard/
+* add Flask-Babel https://pypi.org/project/Flask-Babel/
+* add flask-resources https://pypi.org/project/flask-resources/
+* add flask-whooshalchemy3 https://pypi.org/project/flask-whooshalchemy3/ https://github.com/blakev/Flask-WhooshAlchemy3
+* add flask-filealchemy https://pypi.org/project/flask-filealchemy/
diff --git a/requirements/build.in b/requirements/build.in
index d0bb3a33519e27450757e17d18871e2f1ce1de7b..55fcc8b3af0765167d9a7dadeb87c65859f8a94c 100644
--- a/requirements/build.in
+++ b/requirements/build.in
@@ -10,4 +10,6 @@ pytoml==0.1.21
 venv-run==0.1.0
 six==1.13.0
 pbr==3.1.1
-pre-commit==2.10.1
\ No newline at end of file
+pre-commit==2.10.1
+chardet==3.0.4
+python-dotenv>=0.15.0
diff --git a/requirements/build.txt b/requirements/build.txt
index cbd0a7a2d2b84f0f41d8ce4f2d09461208027c04..5c389499e997f933c6a044d93e40d724abeaa9c1 100644
--- a/requirements/build.txt
+++ b/requirements/build.txt
@@ -14,8 +14,10 @@ certifi==2020.12.5
     #   requests
 cfgv==3.2.0
     # via pre-commit
-chardet==4.0.0
-    # via requests
+chardet==3.0.4
+    # via
+    #   -r requirements\build.in
+    #   requests
 click==7.1.2
     # via pip-tools
 distlib==0.3.1
diff --git a/requirements/dev.in b/requirements/dev.in
index b00b6da498618b2483a8c2553915d8b32aba384e..f086f1a9c3fc77561c4f6d3af3872315cb6920de 100644
--- a/requirements/dev.in
+++ b/requirements/dev.in
@@ -5,27 +5,17 @@ Flask>=1.1.2
 Flask-SQLAlchemy>=2.4.4
 Flask-Cors>=3.0.10
 Flask-BS4>=4.5.3.0,<5.0.0.0
-flask-resources==0.6.0
-Flask-ResponseBuilder>=2.0.12
 Flask-Babel>=2
 Flask-Admin>=1.5.7
 Flask-Redisboard>=0.2.0
-Flask-Monitoring>=1.1.2
-flask-healthz>=0.0.2
-Flask-Caching>=1.9.0
-Flask-DB>=0.3.0
-Flask-Moment>=0.11.0
 flask-whooshalchemy3>=0.2.0
 Flask-PluginKit>=3.6.0
-flask-filealchemy>=0.6.1
 SQLAlchemy>=1.3.23
 celery[redis]>=5.0.5
 psycopg2>=2.8.6
 wget>=3.2
-aiocronjob>=0.2.0
 pyecharts>=1.9.0
 pyecharts-extras>=0.0.5
-reactive-pyecharts>=1.0.0
 visdom>=0.1.8.9
 pynndescent>=0.5.1
 torch>=1.7.1
@@ -33,8 +23,3 @@ numpy>=1.20.1
 pandas>=1.1.0
 scipy>=1.5.0
 StatisticalDiagrams>=20.5
-#chardet==3.0.4
-chardet==4.0.0
-pytz==2021.1
-ruamel.yaml==0.1.6.12
-identify==1.5.14
diff --git a/requirements/dev.txt b/requirements/dev.txt
index 1f0bbb1a9a141e88e6e7f367677bf0c964e5bed2..57aae828197925d85bb652c6fd64f553d22fc8f3 100644
--- a/requirements/dev.txt
+++ b/requirements/dev.txt
@@ -45,7 +45,7 @@ cfgv==3.2.0
     # via pre-commit
 chardet==3.0.4
     # via
-    #   -r requirements\dev.in
+    #   -r requirements\build.in
     #   requests
 cleo==0.8.1
     # via plantuml2freemind
@@ -380,7 +380,6 @@ pytoolbox==14.0.0
     # via -r requirements\build.in
 pytz==2020.5
     # via
-    #   -r requirements\dev.in
     #   aiocronjob
     #   apscheduler
     #   babel
diff --git a/requirements/docs.in b/requirements/docs.in
index 4408c0c12a977e1472294ea38be252fca0c71266..c12d2abd0ce08c33b374d83c4109412b339c616e 100644
--- a/requirements/docs.in
+++ b/requirements/docs.in
@@ -1,16 +1,12 @@
 sphinx>=3.4.3,<3.5.0
-sphinx-tabs==2.0.1
-sphinx-issues==1.2.0
 sphinxcontrib-plantuml==0.19
 sphinxcontrib-gravizo==0.0.4
 sphinxcontrib-log-cabinet==1.0.1
-pallets-sphinx-themes==1.2.3
 py2puml>=0.3.1
 plantuml-creator==1.0.7
 plantuml-markdown==3.4.2
 plantuml-wrapper==0.1.0
 plantuml2freemind==0.8.2
 plantuml-gentools==0.1.2
-manual-sitemap>=19.6.0
 speaklater==1.3
 tokenize-rt>=4.1.0
diff --git a/requirements/tests.in b/requirements/tests.in
index 06e2eddcb8f65b02d480fcf30073151314a6fe9d..0c0b838748945765a68aee9e07d97b605ac9aa9c 100644
--- a/requirements/tests.in
+++ b/requirements/tests.in
@@ -1,4 +1,3 @@
-python-dotenv>=0.15.0
 pytest>=5.3.2,<6.0.0
 pytest-venv>=0.2.1
 pytest-runner>=5.3.0
@@ -6,5 +5,5 @@ pytest-postgresql>=2.6.1
 pytest-flask>=1.1.0
 pytest-flask-sqlalchemy>=1.0.2
 pytest-enabler>=1.2.0
-flask-unittest>=0.1.1
 Flask-Fixtures>=0.3.8
+Flask-DB>=0.3.0
\ No newline at end of file
diff --git a/setup.py b/setup.py
index 840b13c3c8a28a3e6b8fdb16e14cc5affbc7e013..c34ecbb847ed5f160c701be9ae16751898d1bbb3 100644
--- a/setup.py
+++ b/setup.py
@@ -36,7 +36,7 @@ requires_build = [
     "argparse==1.4.0",
     "certifi==2020.12.5",
     "cfgv==3.2.0",
-    "chardet==4.0.0",
+    "chardet==3.0.4",
     "click==7.1.2",
     "distlib==0.3.1",
     "filelock==3.0.12",
@@ -132,7 +132,6 @@ requires_docs = [
     "markupsafe==1.1.1",
     "more-itertools==8.0.2",
     "packaging==20.0",
-    "pallets-sphinx-themes==1.2.3",
     "pastel==0.2.1",
     "pbr==5.5.1",
     "plantuml-creator==1.0.7",
@@ -323,8 +322,6 @@ requires_dev = [
     "reactive-pyecharts==1.0.0",
     "redis==3.5.3",
     "requests==2.25.1",
-    "ruamel-yaml==0.16.12",
-    "ruamel.yaml.clib==0.2.2",
     "scikit-learn==0.24.1",
     "scipy==1.6.0",
     "semver==2.13.0",
@@ -390,7 +387,7 @@ packages = find_packages()
 setup(
     name='covid19python',
     version=version,
-    url='ttps://github.com/thomaswoehlke/covid19python.git',
+    url='https://github.com/thomaswoehlke/covid19python.git',
     license='GNU General Public License v3 (GPLv3)',
     author='Thomas Woehlke',
     author_email='thomas.woehlke@gmail.com',
diff --git a/src/database.py b/src/database.py
index 749581556614b0c3dcd9de9e5107d9754e4c6c5c..70c2f07a668a4bdda0017119448781b1a57eadb6 100644
--- a/src/database.py
+++ b/src/database.py
@@ -1,6 +1,8 @@
 import logging
 from flask import Flask, logging
 import flask_monitoringdashboard as dashboard
+from flask_caching import Cache
+from flask_pluginkit import PluginManager
 from flask_redisboard import RedisBoardExtension
 from flask_cors import CORS
 from flask_bs4 import Bootstrap
@@ -11,6 +13,8 @@ from celery import Celery
 from celery.utils.log import LoggingProxy
 
 board = RedisBoardExtension()
+pm = PluginManager()
+cache = Cache(config={"CACHE_TYPE": "simple"})
 
 def create_app():
     my_app = Flask('covid19')
@@ -25,8 +29,10 @@ def create_app():
     my_app.config['SQLALCHEMY_DATABASE_URI'] = db_url
     my_app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False  # silence the deprecation warning
     my_app.config['FLASK_ADMIN_SWATCH'] = 'superhero'
-    #dashboard.bind(my_app)
+    pm.init_app(app)
     board.init_app(my_app)
+    cache.init_app(app)
+    #dashboard.bind(my_app)
     return my_app