diff --git a/.agents/skills/backend/SKILL.md b/.agents/skills/backend/SKILL.md
index b4aebfe..dc5592a 100644
--- a/.agents/skills/backend/SKILL.md
+++ b/.agents/skills/backend/SKILL.md
@@ -131,7 +131,7 @@ Strip supplierName?: str from T11 (resolve via entityId in cached supplier list)
 
 # Dash API Routes Overview (All)
 
-Overview of all 263 API endpoints across all modules.
+Overview of all 264 API endpoints across all modules.
 
 ### Notation
 
@@ -629,6 +629,9 @@ _none_
 #### Database health check — `GET /health`
 _none_
 - Returns: `200 { ok: bool }`
+#### Health latency history — `GET /health/latency`
+- Params: `query: range?: str`
+- Returns: `200 { raw: { timestamp: int, value: num }[], avg: { timestamp: int, value: num }[], max: { timestamp: int, value: num }[] }`
 
 ### Section: /image