diff --git a/documentation/diagrams/ETL_C4.drawio b/documentation/diagrams/ETL_C4.drawio
new file mode 100644
index 0000000..679e3d3
--- /dev/null
+++ b/documentation/diagrams/ETL_C4.drawio
@@ -0,0 +1,118 @@
+<mxfile host="app.diagrams.net" agent="Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/130.0.0.0 Safari/537.36" version="26.0.5">
+  <diagram name="Seite-1" id="WNMV8rePnVf-2Vz_xhjt">
+    <mxGraphModel dx="1688" dy="1050" grid="1" gridSize="10" guides="1" tooltips="1" connect="1" arrows="1" fold="1" page="1" pageScale="1" pageWidth="827" pageHeight="1169" math="0" shadow="0">
+      <root>
+        <mxCell id="0" />
+        <mxCell id="1" parent="0" />
+        <object placeholders="1" c4Name="Datenbank Aggregation" c4Type="Container" c4Technology="MySQL" c4Description="Datenbank welche während Aggregation verwendet wurde." label="&lt;font style=&quot;font-size: 16px&quot;&gt;&lt;b&gt;%c4Name%&lt;/b&gt;&lt;/font&gt;&lt;div&gt;[%c4Type%:&amp;nbsp;%c4Technology%]&lt;/div&gt;&lt;br&gt;&lt;div&gt;&lt;font style=&quot;font-size: 11px&quot;&gt;&lt;font color=&quot;#E6E6E6&quot;&gt;%c4Description%&lt;/font&gt;&lt;/div&gt;" id="0Mexl9jQAquWokRCgHYt-1">
+          <mxCell style="shape=cylinder3;size=15;whiteSpace=wrap;html=1;boundedLbl=1;rounded=0;labelBackgroundColor=none;fillColor=#23A2D9;fontSize=12;fontColor=#ffffff;align=center;strokeColor=#0E7DAD;metaEdit=1;points=[[0.5,0,0],[1,0.25,0],[1,0.5,0],[1,0.75,0],[0.5,1,0],[0,0.75,0],[0,0.5,0],[0,0.25,0]];resizable=0;" vertex="1" parent="1">
+            <mxGeometry x="40" y="100" width="240" height="120" as="geometry" />
+          </mxCell>
+        </object>
+        <object placeholders="1" c4Name="Datenbank Analyse" c4Type="Container" c4Technology="DuckDB" c4Description="Datenbank, welcher für die Analysen verwendet wurden." label="&lt;font style=&quot;font-size: 16px&quot;&gt;&lt;b&gt;%c4Name%&lt;/b&gt;&lt;/font&gt;&lt;div&gt;[%c4Type%:&amp;nbsp;%c4Technology%]&lt;/div&gt;&lt;br&gt;&lt;div&gt;&lt;font style=&quot;font-size: 11px&quot;&gt;&lt;font color=&quot;#E6E6E6&quot;&gt;%c4Description%&lt;/font&gt;&lt;/div&gt;" id="0Mexl9jQAquWokRCgHYt-2">
+          <mxCell style="shape=cylinder3;size=15;whiteSpace=wrap;html=1;boundedLbl=1;rounded=0;labelBackgroundColor=none;fillColor=#23A2D9;fontSize=12;fontColor=#ffffff;align=center;strokeColor=#0E7DAD;metaEdit=1;points=[[0.5,0,0],[1,0.25,0],[1,0.5,0],[1,0.75,0],[0.5,1,0],[0,0.75,0],[0,0.5,0],[0,0.25,0]];resizable=0;" vertex="1" parent="1">
+            <mxGeometry x="790" y="100" width="240" height="120" as="geometry" />
+          </mxCell>
+        </object>
+        <mxCell id="0Mexl9jQAquWokRCgHYt-5" style="edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;exitX=0;exitY=0.5;exitDx=0;exitDy=0;exitPerimeter=0;dashed=1;dashPattern=8 8;" edge="1" parent="1" source="0Mexl9jQAquWokRCgHYt-3" target="0Mexl9jQAquWokRCgHYt-1">
+          <mxGeometry relative="1" as="geometry" />
+        </mxCell>
+        <mxCell id="0Mexl9jQAquWokRCgHYt-7" value="liest Datenbank" style="edgeLabel;html=1;align=center;verticalAlign=middle;resizable=0;points=[];" vertex="1" connectable="0" parent="0Mexl9jQAquWokRCgHYt-5">
+          <mxGeometry x="-0.2497" y="-1" relative="1" as="geometry">
+            <mxPoint x="-10" y="1" as="offset" />
+          </mxGeometry>
+        </mxCell>
+        <object placeholders="1" c4Name="Sling" c4Type="sling-cli" c4Description="Kommandozeilenprogramm zur Migration von Datensätzen." label="&lt;font style=&quot;font-size: 16px&quot;&gt;&lt;b&gt;%c4Name%&lt;/b&gt;&lt;/font&gt;&lt;div&gt;[%c4Type%]&lt;/div&gt;&lt;br&gt;&lt;div&gt;&lt;font style=&quot;font-size: 11px&quot;&gt;&lt;font color=&quot;#cccccc&quot;&gt;%c4Description%&lt;/font&gt;&lt;/div&gt;" id="0Mexl9jQAquWokRCgHYt-3">
+          <mxCell style="rounded=1;whiteSpace=wrap;html=1;labelBackgroundColor=none;fillColor=#1061B0;fontColor=#ffffff;align=center;arcSize=10;strokeColor=#0D5091;metaEdit=1;resizable=0;points=[[0.25,0,0],[0.5,0,0],[0.75,0,0],[1,0.25,0],[1,0.5,0],[1,0.75,0],[0.75,1,0],[0.5,1,0],[0.25,1,0],[0,0.75,0],[0,0.5,0],[0,0.25,0]];" vertex="1" parent="1">
+            <mxGeometry x="400" y="100" width="240" height="120" as="geometry" />
+          </mxCell>
+        </object>
+        <mxCell id="0Mexl9jQAquWokRCgHYt-6" style="edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;exitX=1;exitY=0.5;exitDx=0;exitDy=0;exitPerimeter=0;entryX=0;entryY=0.5;entryDx=0;entryDy=0;entryPerimeter=0;dashed=1;dashPattern=8 8;" edge="1" parent="1" source="0Mexl9jQAquWokRCgHYt-3" target="0Mexl9jQAquWokRCgHYt-2">
+          <mxGeometry relative="1" as="geometry" />
+        </mxCell>
+        <mxCell id="0Mexl9jQAquWokRCgHYt-8" value="schreibt in Datenbank" style="edgeLabel;html=1;align=center;verticalAlign=middle;resizable=0;points=[];" vertex="1" connectable="0" parent="0Mexl9jQAquWokRCgHYt-6">
+          <mxGeometry x="-0.1744" relative="1" as="geometry">
+            <mxPoint x="16" y="-1" as="offset" />
+          </mxGeometry>
+        </mxCell>
+        <object placeholders="1" c4Name="Preprocessing" c4Type="ContainerScopeBoundary" c4Application="Component" label="&lt;font style=&quot;font-size: 16px&quot;&gt;&lt;b&gt;&lt;div style=&quot;text-align: left&quot;&gt;%c4Name%&lt;/div&gt;&lt;/b&gt;&lt;/font&gt;&lt;div style=&quot;text-align: left&quot;&gt;[%c4Application%]&lt;/div&gt;" id="0Mexl9jQAquWokRCgHYt-9">
+          <mxCell style="rounded=1;fontSize=11;whiteSpace=wrap;html=1;dashed=1;arcSize=20;fillColor=none;strokeColor=#666666;fontColor=#333333;labelBackgroundColor=none;align=left;verticalAlign=bottom;labelBorderColor=none;spacingTop=0;spacing=10;dashPattern=8 4;metaEdit=1;rotatable=0;perimeter=rectanglePerimeter;noLabel=0;labelPadding=0;allowArrows=0;connectable=0;expand=0;recursiveResize=0;editable=1;pointerEvents=0;absoluteArcSize=1;points=[[0.25,0,0],[0.5,0,0],[0.75,0,0],[1,0.25,0],[1,0.5,0],[1,0.75,0],[0.75,1,0],[0.5,1,0],[0.25,1,0],[0,0.75,0],[0,0.5,0],[0,0.25,0]];" vertex="1" parent="1">
+            <mxGeometry x="20" y="40" width="1030" height="270" as="geometry" />
+          </mxCell>
+        </object>
+        <object placeholders="1" c4Name="Datenbank Analyse" c4Type="Container" c4Technology="DuckDB" c4Description="Datenbank, welcher für die Analysen verwendet wurden." label="&lt;font style=&quot;font-size: 16px&quot;&gt;&lt;b&gt;%c4Name%&lt;/b&gt;&lt;/font&gt;&lt;div&gt;[%c4Type%:&amp;nbsp;%c4Technology%]&lt;/div&gt;&lt;br&gt;&lt;div&gt;&lt;font style=&quot;font-size: 11px&quot;&gt;&lt;font color=&quot;#E6E6E6&quot;&gt;%c4Description%&lt;/font&gt;&lt;/div&gt;" id="0Mexl9jQAquWokRCgHYt-10">
+          <mxCell style="shape=cylinder3;size=15;whiteSpace=wrap;html=1;boundedLbl=1;rounded=0;labelBackgroundColor=none;fillColor=#23A2D9;fontSize=12;fontColor=#ffffff;align=center;strokeColor=#0E7DAD;metaEdit=1;points=[[0.5,0,0],[1,0.25,0],[1,0.5,0],[1,0.75,0],[0.5,1,0],[0,0.75,0],[0,0.5,0],[0,0.25,0]];resizable=0;" vertex="1" parent="1">
+            <mxGeometry x="80" y="480" width="240" height="120" as="geometry" />
+          </mxCell>
+        </object>
+        <object placeholders="1" c4Name="Datenaufbereitung" c4Type="ContainerScopeBoundary" c4Application="ETL" label="&lt;font style=&quot;font-size: 16px&quot;&gt;&lt;b&gt;&lt;div style=&quot;text-align: left&quot;&gt;%c4Name%&lt;/div&gt;&lt;/b&gt;&lt;/font&gt;&lt;div style=&quot;text-align: left&quot;&gt;[%c4Application%]&lt;/div&gt;" id="0Mexl9jQAquWokRCgHYt-11">
+          <mxCell style="rounded=1;fontSize=11;whiteSpace=wrap;html=1;dashed=1;arcSize=20;fillColor=none;strokeColor=#666666;fontColor=#333333;labelBackgroundColor=none;align=left;verticalAlign=bottom;labelBorderColor=none;spacingTop=0;spacing=10;dashPattern=8 4;metaEdit=1;rotatable=0;perimeter=rectanglePerimeter;noLabel=0;labelPadding=0;allowArrows=0;connectable=0;expand=0;recursiveResize=0;editable=1;pointerEvents=0;absoluteArcSize=1;points=[[0.25,0,0],[0.5,0,0],[0.75,0,0],[1,0.25,0],[1,0.5,0],[1,0.75,0],[0.75,1,0],[0.5,1,0],[0.25,1,0],[0,0.75,0],[0,0.5,0],[0,0.25,0]];" vertex="1" parent="1">
+            <mxGeometry x="30" y="440" width="1030" height="490" as="geometry" />
+          </mxCell>
+        </object>
+        <mxCell id="0Mexl9jQAquWokRCgHYt-23" style="rounded=0;orthogonalLoop=1;jettySize=auto;html=1;exitX=1;exitY=0.5;exitDx=0;exitDy=0;exitPerimeter=0;entryX=0;entryY=0.5;entryDx=0;entryDy=0;entryPerimeter=0;dashed=1;dashPattern=8 8;" edge="1" parent="1" source="0Mexl9jQAquWokRCgHYt-12" target="0Mexl9jQAquWokRCgHYt-14">
+          <mxGeometry relative="1" as="geometry" />
+        </mxCell>
+        <mxCell id="0Mexl9jQAquWokRCgHYt-24" value="verwendet" style="edgeLabel;html=1;align=center;verticalAlign=middle;resizable=0;points=[];" vertex="1" connectable="0" parent="0Mexl9jQAquWokRCgHYt-23">
+          <mxGeometry x="-0.0114" y="-2" relative="1" as="geometry">
+            <mxPoint as="offset" />
+          </mxGeometry>
+        </mxCell>
+        <object placeholders="1" c4Name="etl_*.py" c4Type="Python (Polars)" c4Description="Diverse Python Skripts zur Aufbereitung / Zusammenstellung der Daten." label="&lt;font style=&quot;font-size: 16px&quot;&gt;&lt;b&gt;%c4Name%&lt;/b&gt;&lt;/font&gt;&lt;div&gt;[%c4Type%]&lt;/div&gt;&lt;br&gt;&lt;div&gt;&lt;font style=&quot;font-size: 11px&quot;&gt;&lt;font color=&quot;#cccccc&quot;&gt;%c4Description%&lt;/font&gt;&lt;/div&gt;" id="0Mexl9jQAquWokRCgHYt-12">
+          <mxCell style="rounded=1;whiteSpace=wrap;html=1;labelBackgroundColor=none;fillColor=#1061B0;fontColor=#ffffff;align=center;arcSize=10;strokeColor=#0D5091;metaEdit=1;resizable=0;points=[[0.25,0,0],[0.5,0,0],[0.75,0,0],[1,0.25,0],[1,0.5,0],[1,0.75,0],[0.75,1,0],[0.5,1,0],[0.25,1,0],[0,0.75,0],[0,0.5,0],[0,0.25,0]];" vertex="1" parent="1">
+            <mxGeometry x="430" y="710" width="240" height="120" as="geometry" />
+          </mxCell>
+        </object>
+        <mxCell id="0Mexl9jQAquWokRCgHYt-16" style="edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;exitX=0.5;exitY=0;exitDx=0;exitDy=0;exitPerimeter=0;dashed=1;dashPattern=8 8;" edge="1" parent="1" source="0Mexl9jQAquWokRCgHYt-13" target="0Mexl9jQAquWokRCgHYt-10">
+          <mxGeometry relative="1" as="geometry" />
+        </mxCell>
+        <mxCell id="0Mexl9jQAquWokRCgHYt-17" value="Liest Datenbank" style="edgeLabel;html=1;align=center;verticalAlign=middle;resizable=0;points=[];" vertex="1" connectable="0" parent="0Mexl9jQAquWokRCgHYt-16">
+          <mxGeometry x="-0.1633" relative="1" as="geometry">
+            <mxPoint as="offset" />
+          </mxGeometry>
+        </mxCell>
+        <object placeholders="1" c4Name="database.py" c4Type="Python (DuckDB Interface)" c4Description="Wrapper Skript zum Ausführen von SQL." label="&lt;font style=&quot;font-size: 16px&quot;&gt;&lt;b&gt;%c4Name%&lt;/b&gt;&lt;/font&gt;&lt;div&gt;[%c4Type%]&lt;/div&gt;&lt;br&gt;&lt;div&gt;&lt;font style=&quot;font-size: 11px&quot;&gt;&lt;font color=&quot;#cccccc&quot;&gt;%c4Description%&lt;/font&gt;&lt;/div&gt;" id="0Mexl9jQAquWokRCgHYt-13">
+          <mxCell style="rounded=1;whiteSpace=wrap;html=1;labelBackgroundColor=none;fillColor=#1061B0;fontColor=#ffffff;align=center;arcSize=10;strokeColor=#0D5091;metaEdit=1;resizable=0;points=[[0.25,0,0],[0.5,0,0],[0.75,0,0],[1,0.25,0],[1,0.5,0],[1,0.75,0],[0.75,1,0],[0.5,1,0],[0.25,1,0],[0,0.75,0],[0,0.5,0],[0,0.25,0]];" vertex="1" parent="1">
+            <mxGeometry x="80" y="710" width="240" height="120" as="geometry" />
+          </mxCell>
+        </object>
+        <mxCell id="0Mexl9jQAquWokRCgHYt-18" style="rounded=0;orthogonalLoop=1;jettySize=auto;html=1;exitX=0.25;exitY=0;exitDx=0;exitDy=0;exitPerimeter=0;dashed=1;dashPattern=8 8;entryX=0.24;entryY=0.981;entryDx=0;entryDy=0;entryPerimeter=0;" edge="1" parent="1" source="0Mexl9jQAquWokRCgHYt-14" target="0Mexl9jQAquWokRCgHYt-15">
+          <mxGeometry relative="1" as="geometry">
+            <mxPoint x="900" y="600" as="targetPoint" />
+          </mxGeometry>
+        </mxCell>
+        <mxCell id="0Mexl9jQAquWokRCgHYt-19" value="schreibt pickle objekt" style="edgeLabel;html=1;align=center;verticalAlign=middle;resizable=0;points=[];" vertex="1" connectable="0" parent="0Mexl9jQAquWokRCgHYt-18">
+          <mxGeometry x="-0.1818" y="2" relative="1" as="geometry">
+            <mxPoint as="offset" />
+          </mxGeometry>
+        </mxCell>
+        <object placeholders="1" c4Name="etl_cache.py" c4Type="Python (Pickle)" c4Description="Diverse Python Skripts zur Aufbereitung / Zusammenstellung der Daten." label="&lt;font style=&quot;font-size: 16px&quot;&gt;&lt;b&gt;%c4Name%&lt;/b&gt;&lt;/font&gt;&lt;div&gt;[%c4Type%]&lt;/div&gt;&lt;br&gt;&lt;div&gt;&lt;font style=&quot;font-size: 11px&quot;&gt;&lt;font color=&quot;#cccccc&quot;&gt;%c4Description%&lt;/font&gt;&lt;/div&gt;" id="0Mexl9jQAquWokRCgHYt-14">
+          <mxCell style="rounded=1;whiteSpace=wrap;html=1;labelBackgroundColor=none;fillColor=#1061B0;fontColor=#ffffff;align=center;arcSize=10;strokeColor=#0D5091;metaEdit=1;resizable=0;points=[[0.25,0,0],[0.5,0,0],[0.75,0,0],[1,0.25,0],[1,0.5,0],[1,0.75,0],[0.75,1,0],[0.5,1,0],[0.25,1,0],[0,0.75,0],[0,0.5,0],[0,0.25,0]];" vertex="1" parent="1">
+            <mxGeometry x="780" y="710" width="240" height="120" as="geometry" />
+          </mxCell>
+        </object>
+        <object placeholders="1" c4Name="Cache" c4Type="Container" c4Technology="Filesystem" c4Description="Das Dateisystem wird als Pufferspeicher verwendet. Die Daten werden als Pickle Objekte gespeichert." label="&lt;font style=&quot;font-size: 16px&quot;&gt;&lt;b&gt;%c4Name%&lt;/b&gt;&lt;/font&gt;&lt;div&gt;[%c4Type%:&amp;nbsp;%c4Technology%]&lt;/div&gt;&lt;br&gt;&lt;div&gt;&lt;font style=&quot;font-size: 11px&quot;&gt;&lt;font color=&quot;#E6E6E6&quot;&gt;%c4Description%&lt;/font&gt;&lt;/div&gt;" id="0Mexl9jQAquWokRCgHYt-15">
+          <mxCell style="shape=cylinder3;size=15;whiteSpace=wrap;html=1;boundedLbl=1;rounded=0;labelBackgroundColor=none;fillColor=#23A2D9;fontSize=12;fontColor=#ffffff;align=center;strokeColor=#0E7DAD;metaEdit=1;points=[[0.5,0,0],[1,0.25,0],[1,0.5,0],[1,0.75,0],[0.5,1,0],[0,0.75,0],[0,0.5,0],[0,0.25,0]];resizable=0;" vertex="1" parent="1">
+            <mxGeometry x="780" y="480" width="240" height="120" as="geometry" />
+          </mxCell>
+        </object>
+        <mxCell id="0Mexl9jQAquWokRCgHYt-20" style="rounded=0;orthogonalLoop=1;jettySize=auto;html=1;entryX=0.746;entryY=1.002;entryDx=0;entryDy=0;entryPerimeter=0;dashed=1;dashPattern=8 8;exitX=0.75;exitY=0;exitDx=0;exitDy=0;exitPerimeter=0;" edge="1" parent="1" source="0Mexl9jQAquWokRCgHYt-14" target="0Mexl9jQAquWokRCgHYt-15">
+          <mxGeometry relative="1" as="geometry" />
+        </mxCell>
+        <mxCell id="0Mexl9jQAquWokRCgHYt-21" value="liest pickle objekt" style="edgeLabel;html=1;align=center;verticalAlign=middle;resizable=0;points=[];" vertex="1" connectable="0" parent="0Mexl9jQAquWokRCgHYt-20">
+          <mxGeometry x="-0.1076" y="1" relative="1" as="geometry">
+            <mxPoint x="8" y="-11" as="offset" />
+          </mxGeometry>
+        </mxCell>
+        <mxCell id="0Mexl9jQAquWokRCgHYt-25" style="rounded=0;orthogonalLoop=1;jettySize=auto;html=1;exitX=0;exitY=0.5;exitDx=0;exitDy=0;exitPerimeter=0;entryX=1;entryY=0.5;entryDx=0;entryDy=0;entryPerimeter=0;dashed=1;dashPattern=8 8;" edge="1" parent="1" source="0Mexl9jQAquWokRCgHYt-12" target="0Mexl9jQAquWokRCgHYt-13">
+          <mxGeometry relative="1" as="geometry" />
+        </mxCell>
+        <mxCell id="0Mexl9jQAquWokRCgHYt-26" value="Verwendet" style="edgeLabel;html=1;align=center;verticalAlign=middle;resizable=0;points=[];" vertex="1" connectable="0" parent="0Mexl9jQAquWokRCgHYt-25">
+          <mxGeometry x="0.0473" relative="1" as="geometry">
+            <mxPoint as="offset" />
+          </mxGeometry>
+        </mxCell>
+      </root>
+    </mxGraphModel>
+  </diagram>
+</mxfile>