Add documentation for Stock in Air query at SSMM

Care/Operations/stock_in_air_ssmm.md

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+
+# Stock in Air - SSMM
+
+> In-transit stock deliveries (in-progress) with product, quantity, route, and creator details
+
+## Purpose
+
+Lists stock deliveries that are currently `in_progress` ("stock in air") at SSMM, showing what product is moving, quantity, delivery/order status, movement date, origin and destination locations, and the user who created the delivery record.
+
+## Parameters
+
+| Parameter | Type | Description | Example |
+|-----------|------|-------------|---------|
+| `date` | DATE / range | Metabase date filter (typically bound to `esd.created_date`) | `'2026-08-01'` |
+
+---
+
+## Query
+
+```sql
+SELECT
+	epk.name AS product_name,
+	esd.supplied_item_quantity AS supplied_qty,
+	esd.status AS delivery_status,
+	edo.status AS order_status,
+	esd.created_date AS delivery_date,
+	origin.name AS origin,
+	destination.name AS destination,
+	CONCAT(uu.first_name, ' ', uu.last_name) AS delivery_created_by
+FROM emr_supplydelivery esd
+JOIN emr_deliveryorder edo
+	ON esd.order_id = edo.id
+JOIN emr_inventoryitem eii
+	ON esd.supplied_inventory_item_id = eii.id
+JOIN emr_product ep
+	ON eii.product_id = ep.id
+JOIN emr_productknowledge epk
+	ON ep.product_knowledge_id = epk.id
+ JOIN emr_facilitylocation origin
+	ON origin.id = edo.origin_id
+   AND origin.deleted = FALSE
+ JOIN emr_facilitylocation destination
+	ON destination.id = edo.destination_id
+   AND destination.deleted = FALSE
+LEFT JOIN users_user uu
+	ON uu.id = esd.created_by_id
+WHERE edo.origin_id IS NOT NULL
+  AND esd.status = 'in_progress'
+  --[[AND {{date}}]]
+ORDER BY epk.name;
+```
+
+## Notes
+
+- **"Stock in air" definition:** This query treats any supply delivery with `esd.status = 'in_progress'` as in-transit stock.
+- **Metabase filter:** `[[AND {{date}}]]` is a field filter — bind it to `esd.created_date`.
+- Results are ordered alphabetically by `product_name`.
+
+*Last updated: 2026-08-13*