Add inline SVG consumption graphs

jon/db/add_views.sql

@@ -58,6 +58,23 @@ FROM garfield.inventory_items
   ) m USING (item_id)
 ORDER BY inventory_items.name;
 
+-- How many *other* active inventory lines exist with the same barcode in the same location that are newer?
+CREATE TEMPORARY VIEW more_recent_inventory_lines_with_same_barcode AS
+SELECT
+  a.item_id,
+  -- It's important not to count(*) here because item_id is NULL
+  -- when no other inventory lines exist.
+  count(b.item_id) AS other_lines_count
+FROM garfield.inventory_items AS a
+LEFT JOIN garfield.inventory_items AS b
+       ON a.item_barcode = b.item_barcode
+      AND a.item_id != b.item_id
+      AND a.location = b.location
+      AND b.available
+      AND b.bought > a.bought
+GROUP BY a.item_id;
+
+-- Get an array of how often items were sold over the last 14 days
 CREATE TEMPORARY VIEW inventory_last_n_days_sales AS
 WITH
 last_n_days AS (

jon/db/get_inventory_overview.sql

@@ -1,6 +1,7 @@
 SELECT
   *
 FROM all_inventory_item_overview
+LEFT JOIN more_recent_inventory_lines_with_same_barcode USING (item_id)
 LEFT JOIN inventory_last_n_days_sales USING (item_id)
 WHERE (%(location_id)s IS NULL OR location = %(location_id)s)
   AND available

jon/templates/inventory/index.html

@@ -26,6 +26,7 @@
 {% block content %}
 <table>
   <tr>
+    <th>Stat</th>
     <th>ID</th>
     <th>Graph</th>
     <th>Barcode</th>
@@ -41,6 +42,10 @@
   </tr>
 {% for item in items %}
   <tr>
+    <td>
+      {% if item.units_left == 0 %}<span title="Leerer aktiver Inventareintrag">🅾️</span>{% endif %}
+      {% if item.other_lines_count != 0 %}<span title="{% if item.other_lines_count == 1 %}Neuerer Eintrag mit demselben Barcode ist aktiv{% else %}{{ item.other_lines_count }} Einträge mit demselben Barcode sind aktiv{% endif %}">🔄</span>{% endif %}
+    </td>
     <td><a href="/inventory/item/{{ item.item_id }}">{{ item.item_id }}</a></td>
     <td>{{ consumption_graph_svg(item.last_n_days_sales) }}</td>
     <td><code>{{ item.item_barcode }}</code></td>