diff --git a/src/core/services/anilist/anilist-auth.ts b/src/core/services/anilist/anilist-auth.ts
deleted file mode 100644
index 94e02cf..0000000
--- a/src/core/services/anilist/anilist-auth.ts
+++ /dev/null
@@ -1,76 +0,0 @@
-import * as childProcess from "child_process";
-
-const SECRET_COMMAND_PATTERN = /^\((.*)\)$/s;
-const COMMAND_CACHE = new Map<string, string>();
-const COMMAND_PENDING = new Map<string, Promise<string>>();
-
-function executeCommand(command: string): Promise<string> {
-  return new Promise((resolve, reject) => {
-    childProcess.exec(command, { timeout: 10_000 }, (err, stdout) => {
-      if (err) {
-        reject(err);
-        return;
-      }
-      resolve(stdout);
-    });
-  });
-}
-
-export function clearAnilistClientSecretCache(): void {
-  COMMAND_CACHE.clear();
-  COMMAND_PENDING.clear();
-}
-
-function resolveCommand(rawSecret: string): string | null {
-  const commandMatch = rawSecret.match(SECRET_COMMAND_PATTERN);
-  if (!commandMatch || commandMatch[1] === undefined) {
-    return null;
-  }
-
-  const command = commandMatch[1].trim();
-  return command.length > 0 ? command : null;
-}
-
-export async function resolveAnilistClientSecret(rawSecret: string): Promise<string> {
-  const trimmedSecret = rawSecret.trim();
-  if (trimmedSecret.length === 0) {
-    throw new Error("cannot authenticate without client secret");
-  }
-
-  const command = resolveCommand(trimmedSecret);
-  if (!command) {
-    return trimmedSecret;
-  }
-
-  const cachedValue = COMMAND_CACHE.get(trimmedSecret);
-  if (cachedValue !== undefined) {
-    return cachedValue;
-  }
-
-  const pending = COMMAND_PENDING.get(trimmedSecret);
-  if (pending !== undefined) {
-    return pending;
-  }
-
-  const promise = executeCommand(command)
-    .then((stdout) => {
-      const trimmed = stdout.trim();
-      if (!trimmed) {
-        throw new Error("secret command returned empty value");
-      }
-      COMMAND_CACHE.set(trimmedSecret, trimmed);
-      COMMAND_PENDING.delete(trimmedSecret);
-      return trimmed;
-    })
-    .catch((error) => {
-      COMMAND_PENDING.delete(trimmedSecret);
-      const errorMessage = error instanceof Error ? error.message : String(error);
-      if (errorMessage === "secret command returned empty value") {
-        throw error;
-      }
-      throw new Error(`secret command failed: ${errorMessage}`);
-    });
-
-  COMMAND_PENDING.set(trimmedSecret, promise);
-  return promise;
-}
diff --git a/src/main.ts b/src/main.ts
index 89122d2..07a9e8d 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -209,6 +209,7 @@ const ANILIST_DEVELOPER_SETTINGS_URL = "https://anilist.co/settings/developer";
 const ANILIST_UPDATE_MIN_WATCH_RATIO = 0.85;
 const ANILIST_UPDATE_MIN_WATCH_SECONDS = 10 * 60;
 const ANILIST_DURATION_RETRY_INTERVAL_MS = 15_000;
+const ANILIST_MAX_ATTEMPTED_UPDATE_KEYS = 1000;
 
 let anilistCurrentMediaKey: string | null = null;
 let anilistCurrentMediaDurationSec: number | null = null;
@@ -864,6 +865,17 @@ function buildAnilistAttemptKey(mediaKey: string, episode: number): string {
   return `${mediaKey}::${episode}`;
 }
 
+function rememberAnilistAttemptedUpdateKey(key: string): void {
+  anilistAttemptedUpdateKeys.add(key);
+  if (anilistAttemptedUpdateKeys.size <= ANILIST_MAX_ATTEMPTED_UPDATE_KEYS) {
+    return;
+  }
+  const oldestKey = anilistAttemptedUpdateKeys.values().next().value;
+  if (typeof oldestKey === "string") {
+    anilistAttemptedUpdateKeys.delete(oldestKey);
+  }
+}
+
 async function maybeRunAnilistPostWatchUpdate(): Promise<void> {
   if (anilistUpdateInFlight) {
     return;
@@ -921,13 +933,13 @@ async function maybeRunAnilistPostWatchUpdate(): Promise<void> {
       guess.episode,
     );
     if (result.status === "updated") {
-      anilistAttemptedUpdateKeys.add(attemptKey);
+      rememberAnilistAttemptedUpdateKey(attemptKey);
       showMpvOsd(result.message);
       logger.info(result.message);
       return;
     }
     if (result.status === "skipped") {
-      anilistAttemptedUpdateKeys.add(attemptKey);
+      rememberAnilistAttemptedUpdateKey(attemptKey);
       logger.info(result.message);
       return;
     }