diff --git a/.gitignore b/.gitignore
index 7c87c6d..991826a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -69,3 +69,4 @@ stacosys/lib64
 .pytest_cache/
 workspace.code-workspace
 *.sqlite
+config-server.ini
diff --git a/config.ini b/config.ini
index 9a7cfab..f4ba682 100755
--- a/config.ini
+++ b/config.ini
@@ -2,7 +2,7 @@
 ; Default configuration
 [main]
 lang = fr
-db_url = db.sqlite
+db_sqlite_file = db.sqlite
 db_backup_json_file = db.json
 newcomment_polling = 60
 
diff --git a/poetry.lock b/poetry.lock
index 82d1597..b5aaefe 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -1,6 +1,6 @@
 [[package]]
 name = "appdirs"
-version = "1.4.3"
+version = "1.4.4"
 description = "A small Python module for determining appropriate platform-specific dirs, e.g. a \"user data dir\"."
 category = "dev"
 optional = false
@@ -8,33 +8,33 @@ python-versions = "*"
 
 [[package]]
 name = "apscheduler"
-version = "3.6.3"
+version = "3.7.0"
 description = "In-process task scheduler with Cron-like capabilities"
 category = "main"
 optional = false
-python-versions = "*"
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*, <4"
 
 [package.dependencies]
 pytz = "*"
 six = ">=1.4.0"
-tzlocal = ">=1.2"
+tzlocal = ">=2.0,<3.0"
 
 [package.extras]
 asyncio = ["trollius"]
 doc = ["sphinx", "sphinx-rtd-theme"]
 gevent = ["gevent"]
-mongodb = ["pymongo (>=2.8)"]
+mongodb = ["pymongo (>=3.0)"]
 redis = ["redis (>=3.0)"]
 rethinkdb = ["rethinkdb (>=2.4.0)"]
 sqlalchemy = ["sqlalchemy (>=0.8)"]
-testing = ["pytest", "pytest-cov", "pytest-tornado5", "mock", "pytest-asyncio (<0.6)", "pytest-asyncio"]
+testing = ["pytest (<6)", "pytest-cov", "pytest-tornado5", "mock", "pytest-asyncio (<0.6)", "pytest-asyncio"]
 tornado = ["tornado (>=4.3)"]
 twisted = ["twisted"]
 zookeeper = ["kazoo"]
 
 [[package]]
 name = "atomicwrites"
-version = "1.3.0"
+version = "1.4.0"
 description = "Atomic file writes."
 category = "dev"
 optional = false
@@ -42,21 +42,21 @@ python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 
 [[package]]
 name = "attrs"
-version = "19.3.0"
+version = "20.3.0"
 description = "Classes Without Boilerplate"
 category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 
 [package.extras]
-azure-pipelines = ["coverage", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "zope.interface", "pytest-azurepipelines"]
-dev = ["coverage", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "zope.interface", "sphinx", "pre-commit"]
-docs = ["sphinx", "zope.interface"]
-tests = ["coverage", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "zope.interface"]
+dev = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "zope.interface", "furo", "sphinx", "pre-commit"]
+docs = ["furo", "sphinx", "zope.interface"]
+tests = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "zope.interface"]
+tests_no_zope = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six"]
 
 [[package]]
 name = "black"
-version = "19.10b0"
+version = "20.8b1"
 description = "The uncompromising code formatter."
 category = "dev"
 optional = false
@@ -64,19 +64,21 @@ python-versions = ">=3.6"
 
 [package.dependencies]
 appdirs = "*"
-attrs = ">=18.1.0"
-click = ">=6.5"
+click = ">=7.1.2"
+mypy-extensions = ">=0.4.3"
 pathspec = ">=0.6,<1"
-regex = "*"
-toml = ">=0.9.4"
+regex = ">=2020.1.8"
+toml = ">=0.10.1"
 typed-ast = ">=1.4.0"
+typing-extensions = ">=3.7.4"
 
 [package.extras]
+colorama = ["colorama (>=0.4.3)"]
 d = ["aiohttp (>=3.3.2)", "aiohttp-cors"]
 
 [[package]]
 name = "certifi"
-version = "2019.11.28"
+version = "2020.12.5"
 description = "Python package for providing Mozilla's CA Bundle."
 category = "main"
 optional = false
@@ -84,31 +86,56 @@ python-versions = "*"
 
 [[package]]
 name = "chardet"
-version = "3.0.4"
+version = "4.0.0"
 description = "Universal encoding detector for Python 2 and 3"
 category = "main"
 optional = false
-python-versions = "*"
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 
 [[package]]
 name = "click"
-version = "7.0"
+version = "7.1.2"
 description = "Composable command line interface toolkit"
 category = "main"
 optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 
 [[package]]
 name = "colorama"
-version = "0.4.3"
+version = "0.4.4"
 description = "Cross-platform colored terminal text."
 category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 
+[[package]]
+name = "flake8"
+version = "3.8.4"
+description = "the modular source code checker: pep8 pyflakes and co"
+category = "dev"
+optional = false
+python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,>=2.7"
+
+[package.dependencies]
+mccabe = ">=0.6.0,<0.7.0"
+pycodestyle = ">=2.6.0a1,<2.7.0"
+pyflakes = ">=2.2.0,<2.3.0"
+
+[[package]]
+name = "flake8-black"
+version = "0.2.1"
+description = "flake8 plugin to call black as a code style validator"
+category = "dev"
+optional = false
+python-versions = "*"
+
+[package.dependencies]
+black = "*"
+flake8 = ">=3.0.0"
+
 [[package]]
 name = "flask"
-version = "1.1.1"
+version = "1.1.2"
 description = "A simple framework for building complex web applications."
 category = "main"
 optional = false
@@ -140,26 +167,19 @@ python-dateutil = ">=2.4.2"
 
 [[package]]
 name = "idna"
-version = "2.8"
+version = "2.10"
 description = "Internationalized Domain Names in Applications (IDNA)"
 category = "main"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 
 [[package]]
-name = "importlib-metadata"
-version = "1.3.0"
-description = "Read metadata from Python packages"
+name = "iniconfig"
+version = "1.1.1"
+description = "iniconfig: brain-dead simple config-ini parsing"
 category = "dev"
 optional = false
-python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,>=2.7"
-
-[package.dependencies]
-zipp = ">=0.5"
-
-[package.extras]
-docs = ["sphinx", "rst.linker"]
-testing = ["packaging", "importlib-resources"]
+python-versions = "*"
 
 [[package]]
 name = "itsdangerous"
@@ -171,11 +191,11 @@ python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 
 [[package]]
 name = "jinja2"
-version = "2.10.3"
+version = "2.11.2"
 description = "A very fast and expressive template engine."
 category = "main"
 optional = false
-python-versions = "*"
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 
 [package.dependencies]
 MarkupSafe = ">=0.23"
@@ -185,11 +205,11 @@ i18n = ["Babel (>=0.8)"]
 
 [[package]]
 name = "markdown"
-version = "3.1.1"
+version = "3.3.3"
 description = "Python implementation of Markdown."
 category = "main"
 optional = false
-python-versions = ">=2.7,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*"
+python-versions = ">=3.6"
 
 [package.extras]
 testing = ["coverage", "pyyaml"]
@@ -203,12 +223,12 @@ optional = false
 python-versions = ">=2.7,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*"
 
 [[package]]
-name = "more-itertools"
-version = "8.0.2"
-description = "More routines for operating on iterables, beyond itertools"
+name = "mccabe"
+version = "0.6.1"
+description = "McCabe checker, plugin for flake8"
 category = "dev"
 optional = false
-python-versions = ">=3.5"
+python-versions = "*"
 
 [[package]]
 name = "mypy"
@@ -236,7 +256,7 @@ python-versions = "*"
 
 [[package]]
 name = "packaging"
-version = "19.2"
+version = "20.8"
 description = "Core utilities for Python packages"
 category = "dev"
 optional = false
@@ -244,11 +264,10 @@ python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 
 [package.dependencies]
 pyparsing = ">=2.0.2"
-six = "*"
 
 [[package]]
 name = "pathspec"
-version = "0.7.0"
+version = "0.8.1"
 description = "Utility library for gitignore style pattern matching of file paths."
 category = "dev"
 optional = false
@@ -256,7 +275,7 @@ python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 
 [[package]]
 name = "peewee"
-version = "3.13.1"
+version = "3.14.0"
 description = "a little orm"
 category = "main"
 optional = false
@@ -270,9 +289,6 @@ category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 
-[package.dependencies]
-importlib-metadata = {version = ">=0.12", markers = "python_version < \"3.8\""}
-
 [package.extras]
 dev = ["pre-commit", "tox"]
 
@@ -286,15 +302,31 @@ python-versions = "*"
 
 [[package]]
 name = "py"
-version = "1.8.1"
+version = "1.10.0"
 description = "library with cross-python path, ini-parsing, io, code, log facilities"
 category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 
+[[package]]
+name = "pycodestyle"
+version = "2.6.0"
+description = "Python style guide checker"
+category = "dev"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+
+[[package]]
+name = "pyflakes"
+version = "2.2.0"
+description = "passive checker of Python programs"
+category = "dev"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+
 [[package]]
 name = "pyparsing"
-version = "2.4.6"
+version = "2.4.7"
 description = "Python parsing module"
 category = "dev"
 optional = false
@@ -310,22 +342,21 @@ python-versions = "*"
 
 [[package]]
 name = "pytest"
-version = "5.3.2"
+version = "6.2.1"
 description = "pytest: simple powerful testing with Python"
 category = "dev"
 optional = false
-python-versions = ">=3.5"
+python-versions = ">=3.6"
 
 [package.dependencies]
 atomicwrites = {version = ">=1.0", markers = "sys_platform == \"win32\""}
-attrs = ">=17.4.0"
+attrs = ">=19.2.0"
 colorama = {version = "*", markers = "sys_platform == \"win32\""}
-importlib-metadata = {version = ">=0.12", markers = "python_version < \"3.8\""}
-more-itertools = ">=4.0.0"
+iniconfig = "*"
 packaging = "*"
-pluggy = ">=0.12,<1.0"
-py = ">=1.5.0"
-wcwidth = "*"
+pluggy = ">=0.12,<1.0.0a1"
+py = ">=1.8.2"
+toml = "*"
 
 [package.extras]
 testing = ["argcomplete", "hypothesis (>=3.56)", "mock", "nose", "requests", "xmlschema"]
@@ -343,7 +374,7 @@ six = ">=1.5"
 
 [[package]]
 name = "pytz"
-version = "2019.3"
+version = "2020.5"
 description = "World timezone definitions, modern and historical"
 category = "main"
 optional = false
@@ -351,7 +382,7 @@ python-versions = "*"
 
 [[package]]
 name = "regex"
-version = "2020.2.20"
+version = "2020.11.13"
 description = "Alternative regular expression module, to replace re."
 category = "dev"
 optional = false
@@ -359,7 +390,7 @@ python-versions = "*"
 
 [[package]]
 name = "requests"
-version = "2.22.0"
+version = "2.25.1"
 description = "Python HTTP for Humans."
 category = "main"
 optional = false
@@ -367,12 +398,12 @@ python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 
 [package.dependencies]
 certifi = ">=2017.4.17"
-chardet = ">=3.0.2,<3.1.0"
-idna = ">=2.5,<2.9"
-urllib3 = ">=1.21.1,<1.25.0 || >1.25.0,<1.25.1 || >1.25.1,<1.26"
+chardet = ">=3.0.2,<5"
+idna = ">=2.5,<3"
+urllib3 = ">=1.21.1,<1.27"
 
 [package.extras]
-security = ["pyOpenSSL (>=0.14)", "cryptography (>=1.3.4)", "idna (>=2.0.0)"]
+security = ["pyOpenSSL (>=0.14)", "cryptography (>=1.3.4)"]
 socks = ["PySocks (>=1.5.6,!=1.5.7)", "win-inet-pton"]
 
 [[package]]
@@ -388,11 +419,11 @@ dev = ["pytest"]
 
 [[package]]
 name = "six"
-version = "1.13.0"
+version = "1.15.0"
 description = "Python 2 and 3 compatibility utilities"
 category = "main"
 optional = false
-python-versions = ">=2.6, !=3.0.*, !=3.1.*"
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*"
 
 [[package]]
 name = "tinydb"
@@ -404,15 +435,15 @@ python-versions = ">=3.5,<4.0"
 
 [[package]]
 name = "toml"
-version = "0.10.0"
+version = "0.10.2"
 description = "Python Library for Tom's Obvious, Minimal Language"
 category = "dev"
 optional = false
-python-versions = "*"
+python-versions = ">=2.6, !=3.0.*, !=3.1.*, !=3.2.*"
 
 [[package]]
 name = "typed-ast"
-version = "1.4.1"
+version = "1.4.2"
 description = "a fork of Python 2 and 3 ast modules with type comment support"
 category = "dev"
 optional = false
@@ -428,7 +459,7 @@ python-versions = "*"
 
 [[package]]
 name = "tzlocal"
-version = "2.0.0"
+version = "2.1"
 description = "tzinfo object for the local timezone"
 category = "main"
 optional = false
@@ -439,121 +470,103 @@ pytz = "*"
 
 [[package]]
 name = "urllib3"
-version = "1.25.7"
+version = "1.26.2"
 description = "HTTP library with thread-safe connection pooling, file post, and more."
 category = "main"
 optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, <4"
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*, <4"
 
 [package.extras]
 brotli = ["brotlipy (>=0.6.0)"]
 secure = ["pyOpenSSL (>=0.14)", "cryptography (>=1.3.4)", "idna (>=2.0.0)", "certifi", "ipaddress"]
 socks = ["PySocks (>=1.5.6,!=1.5.7,<2.0)"]
 
-[[package]]
-name = "wcwidth"
-version = "0.1.7"
-description = "Measures number of Terminal column cells of wide-character codes"
-category = "dev"
-optional = false
-python-versions = "*"
-
 [[package]]
 name = "werkzeug"
-version = "0.16.0"
+version = "1.0.1"
 description = "The comprehensive WSGI web application library."
 category = "main"
 optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 
 [package.extras]
-dev = ["pytest", "coverage", "tox", "sphinx", "pallets-sphinx-themes", "sphinx-issues"]
-termcolor = ["termcolor"]
+dev = ["pytest", "pytest-timeout", "coverage", "tox", "sphinx", "pallets-sphinx-themes", "sphinx-issues"]
 watchdog = ["watchdog"]
 
-[[package]]
-name = "zipp"
-version = "0.6.0"
-description = "Backport of pathlib-compatible object wrapper for zip files"
-category = "dev"
-optional = false
-python-versions = ">=2.7"
-
-[package.dependencies]
-more-itertools = "*"
-
-[package.extras]
-docs = ["sphinx", "jaraco.packaging (>=3.2)", "rst.linker (>=1.9)"]
-testing = ["pathlib2", "contextlib2", "unittest2"]
-
 [metadata]
 lock-version = "1.1"
-python-versions = "^3.7"
-content-hash = "f3a87d43b25f363c4ef34c8e8aa8b16aadb975c204d34234babbe0ee33038a02"
+python-versions = "^3.9"
+content-hash = "e48d69ed299d1e475a383b7df429d886a1f0e4ac5fa156812a2dc013aa1dce59"
 
 [metadata.files]
 appdirs = [
-    {file = "appdirs-1.4.3-py2.py3-none-any.whl", hash = "sha256:d8b24664561d0d34ddfaec54636d502d7cea6e29c3eaf68f3df6180863e2166e"},
-    {file = "appdirs-1.4.3.tar.gz", hash = "sha256:9e5896d1372858f8dd3344faf4e5014d21849c756c8d5701f78f8a103b372d92"},
+    {file = "appdirs-1.4.4-py2.py3-none-any.whl", hash = "sha256:a841dacd6b99318a741b166adb07e19ee71a274450e68237b4650ca1055ab128"},
+    {file = "appdirs-1.4.4.tar.gz", hash = "sha256:7d5d0167b2b1ba821647616af46a749d1c653740dd0d2415100fe26e27afdf41"},
 ]
 apscheduler = [
-    {file = "APScheduler-3.6.3-py2.py3-none-any.whl", hash = "sha256:e8b1ecdb4c7cb2818913f766d5898183c7cb8936680710a4d3a966e02262e526"},
-    {file = "APScheduler-3.6.3.tar.gz", hash = "sha256:3bb5229eed6fbbdafc13ce962712ae66e175aa214c69bed35a06bffcf0c5e244"},
+    {file = "APScheduler-3.7.0-py2.py3-none-any.whl", hash = "sha256:c06cc796d5bb9eb3c4f77727f6223476eb67749e7eea074d1587550702a7fbe3"},
+    {file = "APScheduler-3.7.0.tar.gz", hash = "sha256:1cab7f2521e107d07127b042155b632b7a1cd5e02c34be5a28ff62f77c900c6a"},
 ]
 atomicwrites = [
-    {file = "atomicwrites-1.3.0-py2.py3-none-any.whl", hash = "sha256:03472c30eb2c5d1ba9227e4c2ca66ab8287fbfbbda3888aa93dc2e28fc6811b4"},
-    {file = "atomicwrites-1.3.0.tar.gz", hash = "sha256:75a9445bac02d8d058d5e1fe689654ba5a6556a1dfd8ce6ec55a0ed79866cfa6"},
+    {file = "atomicwrites-1.4.0-py2.py3-none-any.whl", hash = "sha256:6d1784dea7c0c8d4a5172b6c620f40b6e4cbfdf96d783691f2e1302a7b88e197"},
+    {file = "atomicwrites-1.4.0.tar.gz", hash = "sha256:ae70396ad1a434f9c7046fd2dd196fc04b12f9e91ffb859164193be8b6168a7a"},
 ]
 attrs = [
-    {file = "attrs-19.3.0-py2.py3-none-any.whl", hash = "sha256:08a96c641c3a74e44eb59afb61a24f2cb9f4d7188748e76ba4bb5edfa3cb7d1c"},
-    {file = "attrs-19.3.0.tar.gz", hash = "sha256:f7b7ce16570fe9965acd6d30101a28f62fb4a7f9e926b3bbc9b61f8b04247e72"},
+    {file = "attrs-20.3.0-py2.py3-none-any.whl", hash = "sha256:31b2eced602aa8423c2aea9c76a724617ed67cf9513173fd3a4f03e3a929c7e6"},
+    {file = "attrs-20.3.0.tar.gz", hash = "sha256:832aa3cde19744e49938b91fea06d69ecb9e649c93ba974535d08ad92164f700"},
 ]
 black = [
-    {file = "black-19.10b0-py36-none-any.whl", hash = "sha256:1b30e59be925fafc1ee4565e5e08abef6b03fe455102883820fe5ee2e4734e0b"},
-    {file = "black-19.10b0.tar.gz", hash = "sha256:c2edb73a08e9e0e6f65a0e6af18b059b8b1cdd5bef997d7a0b181df93dc81539"},
+    {file = "black-20.8b1.tar.gz", hash = "sha256:1c02557aa099101b9d21496f8a914e9ed2222ef70336404eeeac8edba836fbea"},
 ]
 certifi = [
-    {file = "certifi-2019.11.28-py2.py3-none-any.whl", hash = "sha256:017c25db2a153ce562900032d5bc68e9f191e44e9a0f762f373977de9df1fbb3"},
-    {file = "certifi-2019.11.28.tar.gz", hash = "sha256:25b64c7da4cd7479594d035c08c2d809eb4aab3a26e5a990ea98cc450c320f1f"},
+    {file = "certifi-2020.12.5-py2.py3-none-any.whl", hash = "sha256:719a74fb9e33b9bd44cc7f3a8d94bc35e4049deebe19ba7d8e108280cfd59830"},
+    {file = "certifi-2020.12.5.tar.gz", hash = "sha256:1a4995114262bffbc2413b159f2a1a480c969de6e6eb13ee966d470af86af59c"},
 ]
 chardet = [
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+    {file = "typed_ast-1.4.2-cp38-cp38-macosx_10_9_x86_64.whl", hash = "sha256:963c80b583b0661918718b095e02303d8078950b26cc00b5e5ea9ababe0de1fc"},
+    {file = "typed_ast-1.4.2-cp38-cp38-manylinux1_i686.whl", hash = "sha256:e683e409e5c45d5c9082dc1daf13f6374300806240719f95dc783d1fc942af10"},
+    {file = "typed_ast-1.4.2-cp38-cp38-manylinux1_x86_64.whl", hash = "sha256:84aa6223d71012c68d577c83f4e7db50d11d6b1399a9c779046d75e24bed74ea"},
+    {file = "typed_ast-1.4.2-cp38-cp38-manylinux2014_aarch64.whl", hash = "sha256:a38878a223bdd37c9709d07cd357bb79f4c760b29210e14ad0fb395294583787"},
+    {file = "typed_ast-1.4.2-cp38-cp38-win32.whl", hash = "sha256:a2c927c49f2029291fbabd673d51a2180038f8cd5a5b2f290f78c4516be48be2"},
+    {file = "typed_ast-1.4.2-cp38-cp38-win_amd64.whl", hash = "sha256:c0c74e5579af4b977c8b932f40a5464764b2f86681327410aa028a22d2f54937"},
+    {file = "typed_ast-1.4.2-cp39-cp39-macosx_10_9_x86_64.whl", hash = "sha256:07d49388d5bf7e863f7fa2f124b1b1d89d8aa0e2f7812faff0a5658c01c59aa1"},
+    {file = "typed_ast-1.4.2-cp39-cp39-manylinux1_i686.whl", hash = "sha256:240296b27397e4e37874abb1df2a608a92df85cf3e2a04d0d4d61055c8305ba6"},
+    {file = "typed_ast-1.4.2-cp39-cp39-manylinux1_x86_64.whl", hash = "sha256:d746a437cdbca200622385305aedd9aef68e8a645e385cc483bdc5e488f07166"},
+    {file = "typed_ast-1.4.2-cp39-cp39-manylinux2014_aarch64.whl", hash = "sha256:14bf1522cdee369e8f5581238edac09150c765ec1cb33615855889cf33dcb92d"},
+    {file = "typed_ast-1.4.2-cp39-cp39-win32.whl", hash = "sha256:cc7b98bf58167b7f2db91a4327da24fb93368838eb84a44c472283778fc2446b"},
+    {file = "typed_ast-1.4.2-cp39-cp39-win_amd64.whl", hash = "sha256:7147e2a76c75f0f64c4319886e7639e490fee87c9d25cb1d4faef1d8cf83a440"},
+    {file = "typed_ast-1.4.2.tar.gz", hash = "sha256:9fc0b3cb5d1720e7141d103cf4819aea239f7d136acf9ee4a69b047b7986175a"},
 ]
 typing-extensions = [
     {file = "typing_extensions-3.7.4.3-py2-none-any.whl", hash = "sha256:dafc7639cde7f1b6e1acc0f457842a83e722ccca8eef5270af2d74792619a89f"},
@@ -738,22 +778,14 @@ typing-extensions = [
     {file = "typing_extensions-3.7.4.3.tar.gz", hash = "sha256:99d4073b617d30288f569d3f13d2bd7548c3a7e4c8de87db09a9d29bb3a4a60c"},
 ]
 tzlocal = [
-    {file = "tzlocal-2.0.0-py2.py3-none-any.whl", hash = "sha256:11c9f16e0a633b4b60e1eede97d8a46340d042e67b670b290ca526576e039048"},
-    {file = "tzlocal-2.0.0.tar.gz", hash = "sha256:949b9dd5ba4be17190a80c0268167d7e6c92c62b30026cf9764caf3e308e5590"},
+    {file = "tzlocal-2.1-py2.py3-none-any.whl", hash = "sha256:e2cb6c6b5b604af38597403e9852872d7f534962ae2954c7f35efcb1ccacf4a4"},
+    {file = "tzlocal-2.1.tar.gz", hash = "sha256:643c97c5294aedc737780a49d9df30889321cbe1204eac2c2ec6134035a92e44"},
 ]
 urllib3 = [
-    {file = "urllib3-1.25.7-py2.py3-none-any.whl", hash = "sha256:a8a318824cc77d1fd4b2bec2ded92646630d7fe8619497b142c84a9e6f5a7293"},
-    {file = "urllib3-1.25.7.tar.gz", hash = "sha256:f3c5fd51747d450d4dcf6f923c81f78f811aab8205fda64b0aba34a4e48b0745"},
-]
-wcwidth = [
-    {file = "wcwidth-0.1.7-py2.py3-none-any.whl", hash = "sha256:f4ebe71925af7b40a864553f761ed559b43544f8f71746c2d756c7fe788ade7c"},
-    {file = "wcwidth-0.1.7.tar.gz", hash = "sha256:3df37372226d6e63e1b1e1eda15c594bca98a22d33a23832a90998faa96bc65e"},
+    {file = "urllib3-1.26.2-py2.py3-none-any.whl", hash = "sha256:d8ff90d979214d7b4f8ce956e80f4028fc6860e4431f731ea4a8c08f23f99473"},
+    {file = "urllib3-1.26.2.tar.gz", hash = "sha256:19188f96923873c92ccb987120ec4acaa12f0461fa9ce5d3d0772bc965a39e08"},
 ]
 werkzeug = [
-    {file = "Werkzeug-0.16.0-py2.py3-none-any.whl", hash = "sha256:e5f4a1f98b52b18a93da705a7458e55afb26f32bff83ff5d19189f92462d65c4"},
-    {file = "Werkzeug-0.16.0.tar.gz", hash = "sha256:7280924747b5733b246fe23972186c6b348f9ae29724135a6dfc1e53cea433e7"},
-]
-zipp = [
-    {file = "zipp-0.6.0-py2.py3-none-any.whl", hash = "sha256:f06903e9f1f43b12d371004b4ac7b06ab39a44adc747266928ae6debfa7b3335"},
-    {file = "zipp-0.6.0.tar.gz", hash = "sha256:3718b1cbcd963c7d4c5511a8240812904164b7f381b647143a89d3b98f9bcd8e"},
+    {file = "Werkzeug-1.0.1-py2.py3-none-any.whl", hash = "sha256:2de2a5db0baeae7b2d2664949077c2ac63fbd16d98da0ff71837f7d1dea3fd43"},
+    {file = "Werkzeug-1.0.1.tar.gz", hash = "sha256:6c80b1e5ad3665290ea39320b91e1be1e0d5f60652b964a3070216de83d2e47c"},
 ]
diff --git a/pyproject.toml b/pyproject.toml
index 4f4726e..fea1773 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,24 +4,26 @@ version = "2.0b2"
 description = "STAtic COmmenting SYStem"
 authors = ["Yax"]
 readme = "README.md"
+include = ["run.py"]
 
 [tool.poetry.dependencies]
 python = "^3.9"
 apscheduler = "^3.6.3"
-flask = "^1.1.1"
-peewee = "^3.13.1"
 pyrss2gen = "^1.1"
 profig = "^0.5.1"
 markdown = "^3.1.1"
 flask_apscheduler = "^1.11.0"
-requests = "^2.22.0"
 tinydb = "^4.3.0"
+Flask = "^1.1.2"
+peewee = "^3.14.0"
+requests = "^2.25.1"
 
 [tool.poetry.dev-dependencies]
-pytest = "^5.2"
-black = {version = "^19.10b0", allow-prereleases = true}
 rope = "^0.16.0"
 mypy = "^0.790"
+flake8-black = "^0.2.1"
+black = "^20.8b1"
+pytest = "^6.2.1"
 
 [build-system]
 requires = ["poetry>=0.12"]
diff --git a/run.py b/run.py
index 51565cd..754dee6 100644
--- a/run.py
+++ b/run.py
@@ -5,15 +5,12 @@ import sys
 import os
 import argparse
 import logging
-from flask import Flask
 
 from stacosys.conf.config import Config, ConfigParameter
 from stacosys.core import database
 from stacosys.core.rss import Rss
 from stacosys.core.mailer import Mailer
 from stacosys.interface import app
-from stacosys.interface import api
-from stacosys.interface import form
 from stacosys.interface import scheduler
 
 
@@ -33,17 +30,29 @@ def configure_logging(level):
 
 def stacosys_server(config_pathname):
 
-    conf = Config.load(config_pathname)
-
     # configure logging
     logger = logging.getLogger(__name__)
     configure_logging(logging.INFO)
     logging.getLogger("werkzeug").level = logging.WARNING
     logging.getLogger("apscheduler.executors").level = logging.WARNING
 
+    # check config file exists
+    if not os.path.isfile(config_pathname):
+        logger.error(f"Configuration file '{config_pathname}' not found.")
+        sys.exit(1)
+
+    # initialize config
+    conf = Config.load(config_pathname)
+
+    # check database file exists (prevents from creating a fresh db)
+    db_pathname = conf.get(ConfigParameter.DB_SQLITE_FILE)
+    if not os.path.isfile(db_pathname):
+        logger.error(f"Database file '{db_pathname}' not found.")
+        sys.exit(1)
+
     # initialize database
     db = database.Database()
-    db.setup(conf.get(ConfigParameter.DB_URL))
+    db.setup(db_pathname)
 
     logger.info("Start Stacosys application")
 
@@ -53,7 +62,7 @@ def stacosys_server(config_pathname):
         conf.get(ConfigParameter.RSS_FILE),
         conf.get(ConfigParameter.RSS_PROTO),
         conf.get(ConfigParameter.SITE_NAME),
-        conf.get(ConfigParameter.SITE_URL)
+        conf.get(ConfigParameter.SITE_URL),
     )
     rss.generate()
 
diff --git a/stacosys/__init__.py b/stacosys/__init__.py
index 3b3dacb..f2dc0e4 100644
--- a/stacosys/__init__.py
+++ b/stacosys/__init__.py
@@ -1 +1 @@
-__version__ = '2.0'
+__version__ = "2.0"
diff --git a/stacosys/conf/config.py b/stacosys/conf/config.py
index 5962f4c..a2571bd 100644
--- a/stacosys/conf/config.py
+++ b/stacosys/conf/config.py
@@ -6,7 +6,7 @@ import profig
 
 
 class ConfigParameter(Enum):
-    DB_URL = "main.db_url"
+    DB_SQLITE_FILE = "main.db_sqlite_file"
     DB_BACKUP_JSON_FILE = "main.db_backup_json_file"
     LANG = "main.lang"
     COMMENT_POLLING = "main.newcomment_polling"
@@ -62,4 +62,3 @@ class Config:
 
     def get_bool(self, key: ConfigParameter):
         return self._params[key.value].lower() in ("yes", "true")
-
diff --git a/stacosys/core/cron.py b/stacosys/core/cron.py
index 292d4e8..3f02c30 100644
--- a/stacosys/core/cron.py
+++ b/stacosys/core/cron.py
@@ -4,10 +4,7 @@
 import logging
 import os
 import re
-import time
-from datetime import datetime
 
-from stacosys.core import rss
 from stacosys.core.templater import Templater, Template
 from stacosys.model.comment import Comment
 from stacosys.model.email import Email
@@ -39,9 +36,8 @@ def _reply_comment_email(lang, mailer, rss, email: Email, site_token):
         return
 
     # retrieve site and comment rows
-    try:
-        comment = Comment.get_by_id(comment_id)
-    except:
+    comment = Comment.get_by_id(comment_id)
+    if not comment:
         logger.warn("unknown comment %d" % comment_id)
         return True
 
diff --git a/stacosys/core/database.py b/stacosys/core/database.py
index 1de6db4..45b89fb 100644
--- a/stacosys/core/database.py
+++ b/stacosys/core/database.py
@@ -2,8 +2,8 @@
 # -*- coding: UTF-8 -*-
 
 import json
-from peewee import DatabaseProxy, Model
-from playhouse.db_url import connect, SqliteDatabase
+from peewee import Model
+from playhouse.db_url import SqliteDatabase
 from playhouse.shortcuts import model_to_dict
 from tinydb import TinyDB
 
@@ -46,4 +46,3 @@ def _backup_db(db_file, Comment):
     for comment in Comment.select():
         cc = _tojson_model(comment)
         table.insert(cc)
-
diff --git a/stacosys/core/imap.py b/stacosys/core/imap.py
index dd29d71..cbd7105 100755
--- a/stacosys/core/imap.py
+++ b/stacosys/core/imap.py
@@ -7,6 +7,7 @@ import email
 import imaplib
 import logging
 import re
+from email.message import Message
 
 from stacosys.model.email import Attachment, Email, Part
 
@@ -50,7 +51,7 @@ class Mailbox(object):
 
         parts = []
         attachments = []
-        plain_text_content: 'no plain-text part'
+        plain_text_content = "no plain-text part"
         for part in raw_msg.walk():
             if part.is_multipart():
                 continue
@@ -73,18 +74,10 @@ class Mailbox(object):
                     )
                 )
             else:
-                part_item = {}
-                content = part.get_payload(decode=True)
                 try:
-                    charset = part.get_param("charset", None)
-                    if charset:
-                        content = to_utf8(content, charset)
-                    elif type(content) == bytes:
-                        content = content.decode("utf8")
-                except:
-                    self.logger.exception()
-                # RFC 3676: remove automatic word-wrapping
-                content = content.replace(" \r\n", " ")
+                    content = to_plain_text_content(part)
+                except Exception:
+                    logging.exception("cannot extract content from mail part")
 
                 parts.append(
                     Part(content=content, content_type=part.get_content_type())
@@ -102,7 +95,7 @@ class Mailbox(object):
             subject=email_nonascii_to_uft8(raw_msg["Subject"]),
             parts=parts,
             attachments=attachments,
-            plain_text_content = plain_text_content
+            plain_text_content=plain_text_content,
         )
 
     def delete_message(self, num):
@@ -156,3 +149,14 @@ def email_nonascii_to_uft8(string):
         else:
             subject = subject + to_utf8(v, charset)
     return subject
+
+
+def to_plain_text_content(part: Message) -> str:
+    content = part.get_payload(decode=True)
+    charset = part.get_param("charset", None)
+    if charset:
+        content = to_utf8(content, charset)
+    elif type(content) == bytes:
+        content = content.decode("utf8")
+    # RFC 3676: remove automatic word-wrapping
+    return content.replace(" \r\n", " ")
diff --git a/stacosys/core/mailer.py b/stacosys/core/mailer.py
index d4b48c1..b2b712e 100644
--- a/stacosys/core/mailer.py
+++ b/stacosys/core/mailer.py
@@ -1,16 +1,11 @@
 #!/usr/bin/env python
 # -*- coding: utf-8 -*-
 
-import json
 import logging
 import smtplib
 from email.mime.text import MIMEText
 
-import requests
-
-from stacosys.conf import config
 from stacosys.core import imap
-from stacosys.model.email import Email
 
 logger = logging.getLogger(__name__)
 
@@ -56,7 +51,7 @@ class Mailer:
                 count = mbox.get_count()
                 for num in range(count):
                     msgs.append(mbox.fetch_message(num + 1))
-        except:
+        except Exception:
             logger.exception("fetch mail exception")
         return msgs
 
@@ -76,7 +71,7 @@ class Mailer:
             s.login(self._smtp_login, self._smtp_password)
             s.send_message(msg)
             s.quit()
-        except:
+        except Exception:
             logger.exception("send mail exception")
             success = False
         return success
@@ -85,5 +80,5 @@ class Mailer:
         try:
             with self._open_mailbox() as mbox:
                 mbox.delete_message(id)
-        except:
+        except Exception:
             logger.exception("delete mail exception")
diff --git a/stacosys/core/rss.py b/stacosys/core/rss.py
index 55076b5..79366af 100644
--- a/stacosys/core/rss.py
+++ b/stacosys/core/rss.py
@@ -7,14 +7,18 @@ from datetime import datetime
 import markdown
 import PyRSS2Gen
 
-import stacosys.conf.config as config
 from stacosys.core.templater import Templater, Template
 from stacosys.model.comment import Comment
 
 
 class Rss:
     def __init__(
-        self, lang, rss_file, rss_proto, site_name, site_url,
+        self,
+        lang,
+        rss_file,
+        rss_proto,
+        site_name,
+        site_url,
     ):
         self._lang = lang
         self._rss_file = rss_file
diff --git a/stacosys/interface/api.py b/stacosys/interface/api.py
index 3e5ef04..7b104e7 100644
--- a/stacosys/interface/api.py
+++ b/stacosys/interface/api.py
@@ -44,7 +44,7 @@ def query_comments():
             comments.append(d)
         r = jsonify({"data": comments})
         r.status_code = 200
-    except:
+    except Exception:
         logger.warn("bad request")
         r = jsonify({"data": []})
         r.status_code = 400
@@ -66,7 +66,7 @@ def get_comments_count():
         )
         r = jsonify({"count": count})
         r.status_code = 200
-    except:
+    except Exception:
         r = jsonify({"count": 0})
         r.status_code = 200
     return r
diff --git a/stacosys/interface/form.py b/stacosys/interface/form.py
index 5bb04c9..192b6a2 100644
--- a/stacosys/interface/form.py
+++ b/stacosys/interface/form.py
@@ -57,7 +57,7 @@ def new_form_comment():
         )
         comment.save()
 
-    except:
+    except Exception:
         logger.exception("new comment failure")
         abort(400)
 
diff --git a/stacosys/model/comment.py b/stacosys/model/comment.py
index 999f5a1..e586b25 100644
--- a/stacosys/model/comment.py
+++ b/stacosys/model/comment.py
@@ -1,11 +1,9 @@
 #!/usr/bin/python
 # -*- coding: UTF-8 -*-
 
-from peewee import Model
 from peewee import CharField
 from peewee import TextField
 from peewee import DateTimeField
-from peewee import ForeignKeyField
 from datetime import datetime
 from stacosys.core.database import BaseModel
 
diff --git a/tests/test_config.py b/tests/test_config.py
index b373587..3df0502 100644
--- a/tests/test_config.py
+++ b/tests/test_config.py
@@ -4,7 +4,7 @@
 import pytest
 from stacosys.conf.config import Config, ConfigParameter
 
-EXPECTED_DB_URL = "sqlite:///db.sqlite"
+EXPECTED_DB_SQLITE_FILE = "db.sqlite"
 EXPECTED_HTTP_PORT = 8080
 EXPECTED_IMAP_PORT = "5000"
 EXPECTED_IMAP_LOGIN = "user"
@@ -13,7 +13,7 @@ EXPECTED_IMAP_LOGIN = "user"
 @pytest.fixture
 def conf():
     conf = Config()
-    conf.put(ConfigParameter.DB_URL, EXPECTED_DB_URL)
+    conf.put(ConfigParameter.DB_SQLITE_FILE, EXPECTED_DB_SQLITE_FILE)
     conf.put(ConfigParameter.HTTP_PORT, EXPECTED_HTTP_PORT)
     conf.put(ConfigParameter.IMAP_PORT, EXPECTED_IMAP_PORT)
     conf.put(ConfigParameter.SMTP_STARTTLS, "yes")
@@ -23,13 +23,13 @@ def conf():
 
 def test_exists(conf):
     assert conf is not None
-    assert conf.exists(ConfigParameter.DB_URL)
+    assert conf.exists(ConfigParameter.DB_SQLITE_FILE)
     assert not conf.exists(ConfigParameter.IMAP_HOST)
 
 
 def test_get(conf):
     assert conf is not None
-    assert conf.get(ConfigParameter.DB_URL) == EXPECTED_DB_URL
+    assert conf.get(ConfigParameter.DB_SQLITE_FILE) == EXPECTED_DB_SQLITE_FILE
     assert conf.get(ConfigParameter.HTTP_PORT) == EXPECTED_HTTP_PORT
     assert conf.get(ConfigParameter.HTTP_HOST) is None
     assert conf.get(ConfigParameter.HTTP_PORT) == EXPECTED_HTTP_PORT
@@ -38,14 +38,14 @@ def test_get(conf):
     try:
         conf.get_int(ConfigParameter.HTTP_PORT)
         assert False
-    except:
+    except Exception:
         pass
     assert conf.get_bool(ConfigParameter.SMTP_STARTTLS)
     assert not conf.get_bool(ConfigParameter.IMAP_SSL)
     try:
         conf.get_bool(ConfigParameter.DB_URL)
         assert False
-    except:
+    except Exception:
         pass
 
 
diff --git a/tests/test_stacosys.py b/tests/test_stacosys.py
index 3b5b8b1..94714f0 100644
--- a/tests/test_stacosys.py
+++ b/tests/test_stacosys.py
@@ -2,4 +2,4 @@ from stacosys import __version__
 
 
 def test_version():
-    assert __version__ == '2.0'
+    assert __version__ == "2.0"
diff --git a/tests/test_templater.py b/tests/test_templater.py
index 6f5b40f..aad652b 100644
--- a/tests/test_templater.py
+++ b/tests/test_templater.py
@@ -2,7 +2,6 @@
 # -*- coding: UTF-8 -*-
 
 import os
-import pytest
 
 from stacosys.core.templater import Templater, Template