Bare bones backend. Frontend just starting.

app/templates/forms/select-color.html

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+<div id="color-chooser">
+    {% for color in [
+        "black", "red", "cyan", "blue", "green",
+        "purple", "yellow", "darkred", "orange",
+        "pink", "lime"] %}
+    <div 
+     class="color-choice color-{{color}}"
+     hx-post="/change-color"
+     hx-vals='{"activity_id": "{{activity.activity_id}}", "color": "{{color}}"}'
+     hx-target="body"
+     >
+        {{ color.capitalize() }}
+    </div>
+    {% endfor %}
+</div>

app/templates/forms/update-entry.html

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+<td class="activity-{{hour.activity.code}}">
+<input 
+id="update-hour-{{hour.hour_id}}"
+class="update-entry-form" 
+type="text" 
+value="{{hour.activity.code}}"
+hx-trigger="change"
+hx-post="/update-entry"
+>
+</input>
+</td>
+<script language="javascript">
+    document.querySelector("#update-hour-{{hour.hour_id}}").focus()
+</script>