feat(analytics): Brand promotional history + specials fix + API key editing

- Add brand promotional history endpoint (GET /api/analytics/v2/brand/:name/promotions)
  - Tracks when products go on special, duration, discounts, quantity sold estimates
  - Aggregates by category with frequency metrics (weekly/monthly)
- Add quantity changes endpoint (GET /api/analytics/v2/store/:id/quantity-changes)
  - Filter by direction (increase/decrease/all) for sales vs restock estimation
- Fix canonical-upsert to populate stock_quantity and total_quantity_available
- Add API key edit functionality in admin UI
  - Edit allowed domains and IPs
  - Display domains in list view

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

backend/src/routes/analytics-v2.ts

@@ -231,6 +231,34 @@ export function createAnalyticsV2Router(pool: Pool): Router {
     }
   });
 
+  /**
+   * GET /brand/:name/promotions
+   * Get brand promotional history - tracks specials, discounts, duration, and sales estimates
+   *
+   * Query params:
+   *   - window: 7d|30d|90d (default: 90d)
+   *   - state: state code filter (e.g., AZ)
+   *   - category: category filter (e.g., Flower)
+   */
+  router.get('/brand/:name/promotions', async (req: Request, res: Response) => {
+    try {
+      const brandName = decodeURIComponent(req.params.name);
+      const window = parseTimeWindow(req.query.window as string) || '90d';
+      const stateCode = req.query.state as string | undefined;
+      const category = req.query.category as string | undefined;
+
+      const result = await brandService.getBrandPromotionalHistory(brandName, {
+        window,
+        stateCode,
+        category,
+      });
+      res.json(result);
+    } catch (error) {
+      console.error('[AnalyticsV2] Brand promotions error:', error);
+      res.status(500).json({ error: 'Failed to fetch brand promotional history' });
+    }
+  });
+
   // ============================================================
   // CATEGORY ANALYTICS
   // ============================================================
@@ -400,6 +428,31 @@ export function createAnalyticsV2Router(pool: Pool): Router {
     }
   });
 
+  /**
+   * GET /store/:id/quantity-changes
+   * Get quantity changes for a store (increases/decreases)
+   * Useful for estimating sales (decreases) or restocks (increases)
+   *
+   * Query params:
+   *   - window: 7d|30d|90d (default: 7d)
+   *   - direction: increase|decrease|all (default: all)
+   *   - limit: number (default: 100)
+   */
+  router.get('/store/:id/quantity-changes', async (req: Request, res: Response) => {
+    try {
+      const dispensaryId = parseInt(req.params.id);
+      const window = parseTimeWindow(req.query.window as string);
+      const direction = (req.query.direction as 'increase' | 'decrease' | 'all') || 'all';
+      const limit = req.query.limit ? parseInt(req.query.limit as string) : 100;
+
+      const result = await storeService.getQuantityChanges(dispensaryId, { window, direction, limit });
+      res.json(result);
+    } catch (error) {
+      console.error('[AnalyticsV2] Store quantity changes error:', error);
+      res.status(500).json({ error: 'Failed to fetch store quantity changes' });
+    }
+  });
+
   /**
    * GET /store/:id/inventory
    * Get store inventory composition