feat: add dashboard summary endpoint and related models, queries, and services

db/queries/dashboard.sql

@@ -0,0 +1,44 @@
+-- name: GetTotalComponentStats :one
+SELECT COUNT(DISTINCT ci.component_id) AS total_types, COALESCE(SUM(ci.quantity), 0)::bigint AS total_quantity
+FROM component_items ci
+JOIN containers con ON ci.container_id = con.id
+JOIN shelves s ON con.shelf_id = s.id
+JOIN cabinets cab ON s.cabinet_id = cab.id
+JOIN rooms r ON cab.room_id = r.id
+WHERE sqlc.narg('warehouse_id')::bigint IS NULL OR r.warehouse_id = sqlc.narg('warehouse_id')::bigint;
+
+-- name: CountPendingInvoices :one
+SELECT COUNT(*) FROM invoices
+WHERE status IN ('draft', 'pending');
+
+-- name: CountLowStockComponents :one
+SELECT COUNT(*) FROM components
+WHERE total_quantity <= min_quantity;
+
+-- name: GetAbnormalItemCounts :many
+SELECT ci.status, COUNT(*) AS count
+FROM component_items ci
+JOIN containers con ON ci.container_id = con.id
+JOIN shelves s ON con.shelf_id = s.id
+JOIN cabinets cab ON s.cabinet_id = cab.id
+JOIN rooms r ON cab.room_id = r.id
+WHERE ci.status != 'normal'
+  AND (sqlc.narg('warehouse_id')::bigint IS NULL OR r.warehouse_id = sqlc.narg('warehouse_id')::bigint)
+GROUP BY ci.status;
+
+-- name: GetTodayInvoiceCounts :many
+SELECT type, COUNT(*) AS count
+FROM invoices
+WHERE created_at::date = CURRENT_DATE
+GROUP BY type;
+
+-- name: GetContainerStats :one
+SELECT
+  COUNT(*) AS total_containers,
+  COUNT(*) - COUNT(DISTINCT ci.container_id) AS empty_containers
+FROM containers c
+JOIN shelves s ON c.shelf_id = s.id
+JOIN cabinets cab ON s.cabinet_id = cab.id
+JOIN rooms r ON cab.room_id = r.id
+LEFT JOIN component_items ci ON c.id = ci.container_id
+WHERE sqlc.narg('warehouse_id')::bigint IS NULL OR r.warehouse_id = sqlc.narg('warehouse_id')::bigint;