Par2 size matching 100x faster; release bookkeeping once per statement

matchPar2Releases checked every same-size release_files row's set and
date (18 s per batch of body-derived binaries); now an index on
release_files (release_id, size) drops the repeated sizes first: 0.16 s.

File inserts updated their release in four row triggers; one statement
trigger now updates each release once per INSERT. Completeness is noted
in release_dirty and recomputed by gc:scheduler every 30 minutes.

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

database/schema.ts

@@ -391,6 +391,13 @@ export class PartSchema extends BaseModel {
   declare pcrc32: string | null
 }
 
+export class ReleaseDirtySchema extends BaseModel {
+  static $columns = ['releaseId'] as const
+  $columns = ReleaseDirtySchema.$columns
+  @column()
+  declare releaseId: bigint | number
+}
+
 export class ReleaseFileSchema extends BaseModel {
   static $columns = ['md5', 'md516K', 'name', 'par2FileId', 'releaseId', 'setId', 'size'] as const
   $columns = ReleaseFileSchema.$columns