Disable unavailable subreddits after Reddit 404

src/services/subreddit-polling-control.ts

@@ -0,0 +1,25 @@
+import type { Config } from '../config/index.js';
+import type { ConfigPersistence } from '../config/index.js';
+import type { Logger } from '../utils/logger.js';
+import type { SubredditPollingControl } from './monitor.js';
+
+/** Persists a terminal Reddit listing failure so every account stops polling it. */
+export function createConfigBackedSubredditPollingControl(
+  config: Config,
+  configStore: ConfigPersistence,
+  logger: Logger,
+): SubredditPollingControl {
+  return {
+    disableUnavailableSubreddit(subreddit: string): void {
+      const entry = config.reddit.subreddits.find((candidate) => candidate.name.toLowerCase() === subreddit.toLowerCase());
+      if (!entry || entry.enabled === false) return;
+
+      entry.enabled = false;
+      configStore.save(config);
+      logger.warn(`Persisted disabled status for unavailable subreddit r/${entry.name}`);
+    },
+    isSubredditEnabled(subreddit: string): boolean {
+      return config.reddit.subreddits.find((entry) => entry.name.toLowerCase() === subreddit.toLowerCase())?.enabled !== false;
+    },
+  };
+}