Garbage: a probe whose release another probe deleted is not an error

Two probes of one release can be applied at once; when one deletes the
release as garbage, the other's inserts (e.g. a par2 listing) violated
the foreign key and the node got a 500.

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

app/services/ContentService.ts

@@ -158,7 +158,17 @@ class ContentService {
    * what it found. Then the release is deleted if it turned out to be garbage (D42).
    */
   async apply(task: InspectTask, probe: InspectProbe): Promise<ContentResult> {
-    const result = await this.applyProbe(task, probe)
+    let result: ContentResult
+    try {
+      result = await this.applyProbe(task, probe)
+    } catch (error: any) {
+      // Another probe of the release (its first volume, its par2) deleted it as garbage meanwhile:
+      // what this one found has nowhere to go (LOG.md 2026-10-08 (7)).
+      if (error.code === '23503' && !(await db.from('files').where('id', task.fileId).select('id').first())) {
+        return { named: 0, contentType: probe.contentType, garbage: 'deleted meanwhile' }
+      }
+      throw error
+    }
     result.garbage = (await GarbageFilter.afterProbe(task.fileId, probe.contentType)) ?? undefined
     return result
   }
@@ -291,7 +301,7 @@ export function describeContent(filename: string, content: ContentResult | null)
   if (content?.contentType === 'nzbe') lines.push(`"${filename}" is an encrypted NZB container.`)
   if (content?.contentType === 'rclone') lines.push(`"${filename}" is rclone-encrypted.`)
   if (content?.yencName) lines.push(`"${filename}" is "${content.yencName}" (yEnc name).`)
-  if (content?.garbage) lines.push(`"${filename}": release deleted as garbage (${content.garbage}, no name or password).`)
+  if (content?.garbage) lines.push(`"${filename}": release deleted as garbage (${content.garbage === 'deleted meanwhile' ? 'by another probe' : `${content.garbage}, no name or password`}).`)
   if (content?.nicovideo) lines.push(`"${filename}" → "${content.nicovideo}".`)
   if (content?.sfvMoved) lines.push(`SFV "${filename}" moved ${content.sfvMoved} files into its release.`)
   if (content?.contentType === 'yencbin') lines.push(`"${filename}" is a yEncBin encrypted container.`)