Spotnet import, header backfill, staging and counter grouping, faster search

Spotnet (CONCEPT D29):
- Index free.pt fully and import spots with their descriptions, categories
  and NZBs; a spot renames its release, since Spotnet names are more
  trustworthy than names derived from subjects.
- Find passwords in spot descriptions too, and tell "needs a password we
  have" from "needs a password we don't have".

Content inspection:
- List the contents of 7z (.7z.001) archives, SFV sets, nicovideo uploads
  and other archive-like files; mark yEncBin .bin containers as encrypted.
- Take real names from yEnc headers for randomly named files, and merge
  uploads that were split across posts.

Storage (D31, D32):
- Store segment lists zstd-compressed behind the FileStore accessor.
- group:backfill indexes older headers at low priority and pauses when
  the NVMe or HDD part of the database gets too large.

Grouping (D35, D36):
- Lone header segments wait in staged_segments until a second segment of
  their file arrives, which drops the per-article junk binaries.
- Counter grouping joins random-subject uploads by poster, [i/M] counter,
  part count and day.

Search and maintenance (D33, D34):
- A trigram-indexed search_text column, smaller indexes, estimated stats.
- Passes that clean up nonsense names; weekly index maintenance; GC budgets
  per kind.
- Web UI: grey out stale results while a search runs and cancel superseded
  requests. Count only up to 1,000 matches for the page, which made filter
  clicks take seconds (Newznab keeps the 10,000 cap).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

lib/release/index.ts

@@ -1,4 +1,4 @@
 /**
  * Grouping of files into releases (downloads), independent of AdonisJS.
  */
-export { releaseIdentity, par2ReleaseIdentity, par2ReleaseName, rarReleaseIdentity, fileStem, subjectRemainder, namesRelease, isPostToken, type ReleaseIdentity, type ReleaseInput } from './release_key.js'
+export { releaseIdentity, par2ReleaseIdentity, par2ReleaseName, rarReleaseIdentity, isGenericName, fileStem, subjectRemainder, namesRelease, isPostToken, type ReleaseIdentity, type ReleaseInput } from './release_key.js'

lib/release/release_key.ts

@@ -197,11 +197,23 @@ export function par2ReleaseName(fileNames: string[]): string | undefined {
  * volumes after the first, the first entry is the file that continues from
  * the previous volume, so all volumes of a single-file archive agree.
  */
+/**
+ * Folder and file names that say nothing about what a release is: disc
+ * structures (VIDEO_TS on every DVD), samples, subtitles, disc numbers.
+ * Kept in step with SQL's is_readable_name().
+ */
+export const GENERIC_NAMES = /^(video_ts|audio_ts|bdmv|certificate|hvdvd_ts|samples?|subs?|subtitles?|proof|cover|covers|extras?|featurettes?|(cd|dvd|disc|disk)[ ._-]?\d{1,2})$/i
+
+export function isGenericName(name: string): boolean {
+  return GENERIC_NAMES.test(name.trim())
+}
+
 export function rarReleaseIdentity(entries: { name: string; size: number | null }[]): ReleaseIdentity | null {
   if (entries.length === 0) return null
   const tops = new Set(entries.map((e) => e.name.split(/[\\/]/)[0]))
   const nested = entries.some((e) => /[\\/]/.test(e.name))
-  if (nested && tops.size === 1) {
+  // A generic top folder (VIDEO_TS) is shared by unrelated archives: key on the first entry instead.
+  if (nested && tops.size === 1 && !isGenericName([...tops][0])) {
     const [top] = tops
     return { key: hash('rar-dir', top), name: top, source: 'rar' }
   }