perf: only prune if adding new entry (nodejs#3872)

lib/cache/sqlite-cache-store.js

@@ -265,8 +265,6 @@ class SqliteCacheStore {
         callback()
       },
       final (callback) {
-        store.prune()
-
         const existingValue = store.#findValue(key, true)
         if (existingValue) {
           // Updating an existing response, let's overwrite it
@@ -283,6 +281,7 @@ class SqliteCacheStore {
             existingValue.id
           )
         } else {
+          store.#prune()
           // New response, let's insert it
           store.#insertValueQuery.run(
             url,
@@ -316,14 +315,8 @@ class SqliteCacheStore {
     this.#deleteByUrlQuery.run(this.#makeValueUrl(key))
   }
 
-  /**
-   * This method is called to prune the cache when it exceeds the maximum number
-   * of entries. It removes half the entries in the cache, ordering them the oldest.
-   *
-   * @returns {Number} The number of entries removed
-   */
-  prune () {
-    if (this.size <= this.#maxCount) {
+  #prune () {
+    if (this.#size <= this.#maxCount) {
       return 0
     }
 
@@ -348,7 +341,7 @@ class SqliteCacheStore {
    * Counts the number of rows in the cache
    * @returns {Number}
    */
-  get size () {
+  get #size () {
     const { total } = this.#countEntriesQuery.get()
     return total
   }