note err code for sql temp dir creation fail

.vscode/numbered-bookmarks.json

@@ -1,3 +1,19 @@
 {
-	"bookmarks": []
+	"bookmarks": [
+		{
+			"fsPath": "$ROOTPATH$/backup/backup.sh",
+			"bookmarks": [
+				-1,
+				-1,
+				-1,
+				-1,
+				-1,
+				-1,
+				-1,
+				-1,
+				-1,
+				401
+			]
+		}
+	]
 }

backup/backup.sh

@@ -668,6 +668,7 @@ exit 0
 # 2: not run as root
 # 3: borg not installed
 # 99: TERM signal trapped
+# 115: unable to create temp dir for SQL dump
 # 130: null configuration variable in details file
 # 131: invalid configuration variable in details file
 # 138: borg exited with a critical error