diff --git a/.gitignore b/.gitignore
index ff1a518..640dded 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,4 @@
 .pio
 CMakeListsPrivate.txt
+/cmake-build*
+/venv
diff --git a/.idea/.gitignore b/.idea/.gitignore
deleted file mode 100644
index 5c98b42..0000000
--- a/.idea/.gitignore
+++ /dev/null
@@ -1,2 +0,0 @@
-# Default ignored files
-/workspace.xml
\ No newline at end of file
diff --git a/.idea/firmware.iml b/.idea/firmware.iml
deleted file mode 100644
index f08604b..0000000
--- a/.idea/firmware.iml
+++ /dev/null
@@ -1,2 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<module classpath="CMake" type="CPP_MODULE" version="4" />
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
deleted file mode 100644
index 3463fba..0000000
--- a/.idea/misc.xml
+++ /dev/null
@@ -1,16 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project version="4">
-  <component name="CMakeWorkspace" PROJECT_DIR="$PROJECT_DIR$" />
-  <component name="CidrRootsConfiguration">
-    <sourceRoots>
-      <file path="$PROJECT_DIR$/src" />
-    </sourceRoots>
-    <libraryRoots>
-      <file path="$PROJECT_DIR$/lib" />
-      <file path="$PROJECT_DIR$/.pio/libdeps" />
-    </libraryRoots>
-    <excludeRoots>
-      <file path="$PROJECT_DIR$/.pio" />
-    </excludeRoots>
-  </component>
-</project>
\ No newline at end of file
diff --git a/.idea/modules.xml b/.idea/modules.xml
deleted file mode 100644
index 9ce81f0..0000000
--- a/.idea/modules.xml
+++ /dev/null
@@ -1,9 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project version="4">
-  <component name="ProjectModuleManager">
-    <modules>
-      <module fileurl="file://$PROJECT_DIR$/.idea/clion.iml" filepath="$PROJECT_DIR$/.idea/clion.iml" />
-      <module fileurl="file://$PROJECT_DIR$/.idea/platformio.iml" filepath="$PROJECT_DIR$/.idea/platformio.iml" />
-    </modules>
-  </component>
-</project>
\ No newline at end of file
diff --git a/.idea/vcs.xml b/.idea/vcs.xml
deleted file mode 100644
index 6c0b863..0000000
--- a/.idea/vcs.xml
+++ /dev/null
@@ -1,6 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project version="4">
-  <component name="VcsDirectoryMappings">
-    <mapping directory="$PROJECT_DIR$/.." vcs="Git" />
-  </component>
-</project>
\ No newline at end of file
diff --git a/todo.txt b/todo.txt
index d0eab02..0289d60 100644
--- a/todo.txt
+++ b/todo.txt
@@ -1,20 +1,7 @@
--> setup platform.io based development with tests
-    - re-write tests with unity
+Backend:
+    - webdav
+        -> delete stuff
+    - SPIFFS remove if full, before rotate (i.e. delete oldest)
+    - auto-off, auto-on feature for session management
 
 
-
-- backend
-    /api/session/start
-    /api/session/finish
-    /api/session/data?startIndex=25 (returns nothing if no session is active)
-    // by default only the in-memory data is reported back
-
-    /api/sessionhistory/ -> list in webdav fashion
-    /api/sessionhistory/sessionid?startIndex -> returns full session data
-    // delete file with method
-
-
-    // auto start session? ringbuffer with last n measurements
-    //  detect spikes -> more than s spikes -> start session
-    // auto stop session if one full chunk is empty
-