make detach listener a separate case

Author: yifanyang

repo-scripts/size-analysis/bundle-definitions/database.json

@@ -151,8 +151,7 @@
               "ref",
               "onChildAdded",
               "onChildChanged",
-              "onChildRemoved",
-              "off"
+              "onChildRemoved"
             ]
           }
         ]
@@ -190,6 +189,38 @@
       }
     ]
   },
+  {
+    "name": "Listen for value events + Detach listeners",
+    "dependencies": [
+      {
+        "packageName": "firebase",
+        "versionOrTag": "latest",
+        "imports": [
+          {
+            "path": "app",
+            "imports": [
+              "initializeApp"
+            ]
+          }
+        ]
+      },
+      {
+        "packageName": "firebase",
+        "versionOrTag": "latest",
+        "imports": [
+          {
+            "path": "database",
+            "imports": [
+              "getDatabase",
+              "ref",
+              "onValue",
+              "off"
+            ]
+          }
+        ]
+      }
+    ]
+  },
   {
     "name": "Sort data",
     "dependencies": [