Add job descriptions and stale-name renames

Show human-friendly per-job descriptions on the Admin Jobs page (JOB_DESCRIPTIONS) and remove the old "About Scheduled Jobs" info box. Add STALE_NAME_REWRITES and renameStaleJobNames() in SchedulerService to automatically rewrite legacy exact-literal job names (e.g. "Plex Library Scan") to neutral defaults on startup; updates are type-gated and use updateMany with exact matches so admin-customized names are not touched. Log successful renames and swallow rename errors so startup remains idempotent. Tests and documentation were updated to reflect the new UI text and to cover rename behavior.

src/lib/services/scheduler.service.ts

@@ -10,6 +10,18 @@ import { RMABLogger } from '../utils/logger';
 
 const logger = RMABLogger.create('Scheduler');
 
+// Legacy literal `name` values that older installs may still have in the DB.
+// Each entry maps an exact stale literal to its current neutral default,
+// type-gated so partial-matches to the word "Plex" can never be touched.
+const STALE_NAME_REWRITES: ReadonlyArray<{
+  type: string;
+  staleName: string;
+  neutralName: string;
+}> = [
+  { type: 'plex_library_scan', staleName: 'Plex Library Scan', neutralName: 'Library Scan' },
+  { type: 'plex_recently_added_check', staleName: 'Plex Recently Added Check', neutralName: 'Recently Added Check' },
+];
+
 export type ScheduledJobType = 'plex_library_scan' | 'plex_recently_added_check' | 'audible_refresh' | 'retry_missing_torrents' | 'retry_failed_imports' | 'find_missing_ebooks' | 'cleanup_seeded_torrents' | 'monitor_rss_feeds' | 'sync_reading_shelves' | 'check_watched_lists';
 
 export interface ScheduledJob {
@@ -62,6 +74,9 @@ export class SchedulerService {
     // Clean up deprecated scheduled jobs
     await this.cleanupDeprecatedJobs();
 
+    // Rewrite legacy literal names (e.g. "Plex Library Scan") to current neutral defaults
+    await this.renameStaleJobNames();
+
     // Create default jobs if they don't exist
     await this.ensureDefaultJobs();
 
@@ -184,6 +199,29 @@ export class SchedulerService {
     }
   }
 
+  /**
+   * Rewrite legacy literal `name` values to their current neutral defaults.
+   * Type-gated on BOTH `name` and `type` exact-equals — admin-customized names
+   * that happen to contain "Plex" are never touched.
+   */
+  private async renameStaleJobNames(): Promise<void> {
+    try {
+      for (const entry of STALE_NAME_REWRITES) {
+        const result = await prisma.scheduledJob.updateMany({
+          where: { name: entry.staleName, type: entry.type },
+          data: { name: entry.neutralName },
+        });
+        if (result.count > 0) {
+          logger.info(`Renamed scheduled job: "${entry.staleName}" → "${entry.neutralName}" (${result.count} row${result.count === 1 ? '' : 's'})`);
+        }
+      }
+    } catch (error) {
+      logger.error('Failed to rename stale scheduled job names', {
+        error: error instanceof Error ? error.message : String(error),
+      });
+    }
+  }
+
   /**
    * Remove any old jobs that are no longer supported
    */