Partition files by age (id)

New rows went into free space scattered through the 9.6 GB heap on the HDD
(left behind by inspection's updates): one random HDD read per insert, and
seed batches took a median 13 s to store. The existing table becomes the
first partition as it is (a CHECK scan, no rewrite; indexes, its foreign
key and the triggers are taken over by the partitioned parent); new
partitions of 4M ids go in the same tablespace and stay in memory while
they fill.

- Every partition has a unique file_key index; FileStore.insert looks keys
  up in all partitions first (a key can't be unique across partitions).
- FilePartitions.ensure() (gc:scheduler) keeps two partitions ahead.
- Stats count files from the partitions; seed:node waits ~20 minutes for
  the API before giving a range up.

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

database/schema.ts

@@ -209,6 +209,117 @@ export class FileSchema extends BaseModel {
   declare updatedAt: DateTime | null
 }
 
+export class FilesP0Schema extends BaseModel {
+  static $columns = ['archive', 'contentType', 'createdAt', 'date', 'fileKey', 'filename', 'firstMessageId', 'groups', 'id', 'parts', 'poster', 'realName', 'releaseId', 'segments', 'size', 'updatedAt'] as const
+  $columns = FilesP0Schema.$columns
+  @column()
+  declare archive: any | null
+  @column()
+  declare contentType: string | null
+  @column.dateTime({ autoCreate: true })
+  declare createdAt: DateTime | null
+  @column()
+  declare date: bigint | number
+  @column()
+  declare fileKey: string | null
+  @column()
+  declare filename: string
+  @column()
+  declare firstMessageId: string | null
+  @column()
+  declare groups: any | null
+  @column({ isPrimary: true })
+  declare id: number
+  @column()
+  declare parts: number
+  @column()
+  declare poster: string
+  @column()
+  declare realName: string | null
+  @column()
+  declare releaseId: bigint | number | null
+  @column()
+  declare segments: Buffer
+  @column()
+  declare size: bigint | number | null
+  @column.dateTime({ autoCreate: true, autoUpdate: true })
+  declare updatedAt: DateTime | null
+}
+
+export class FilesP1000000Schema extends BaseModel {
+  static $columns = ['archive', 'contentType', 'createdAt', 'date', 'fileKey', 'filename', 'firstMessageId', 'groups', 'id', 'parts', 'poster', 'realName', 'releaseId', 'segments', 'size', 'updatedAt'] as const
+  $columns = FilesP1000000Schema.$columns
+  @column()
+  declare archive: any | null
+  @column()
+  declare contentType: string | null
+  @column.dateTime({ autoCreate: true })
+  declare createdAt: DateTime | null
+  @column()
+  declare date: bigint | number
+  @column()
+  declare fileKey: string | null
+  @column()
+  declare filename: string
+  @column()
+  declare firstMessageId: string | null
+  @column()
+  declare groups: any | null
+  @column({ isPrimary: true })
+  declare id: number
+  @column()
+  declare parts: number
+  @column()
+  declare poster: string
+  @column()
+  declare realName: string | null
+  @column()
+  declare releaseId: bigint | number | null
+  @column()
+  declare segments: Buffer
+  @column()
+  declare size: bigint | number | null
+  @column.dateTime({ autoCreate: true, autoUpdate: true })
+  declare updatedAt: DateTime | null
+}
+
+export class FilesP5000000Schema extends BaseModel {
+  static $columns = ['archive', 'contentType', 'createdAt', 'date', 'fileKey', 'filename', 'firstMessageId', 'groups', 'id', 'parts', 'poster', 'realName', 'releaseId', 'segments', 'size', 'updatedAt'] as const
+  $columns = FilesP5000000Schema.$columns
+  @column()
+  declare archive: any | null
+  @column()
+  declare contentType: string | null
+  @column.dateTime({ autoCreate: true })
+  declare createdAt: DateTime | null
+  @column()
+  declare date: bigint | number
+  @column()
+  declare fileKey: string | null
+  @column()
+  declare filename: string
+  @column()
+  declare firstMessageId: string | null
+  @column()
+  declare groups: any | null
+  @column({ isPrimary: true })
+  declare id: number
+  @column()
+  declare parts: number
+  @column()
+  declare poster: string
+  @column()
+  declare realName: string | null
+  @column()
+  declare releaseId: bigint | number | null
+  @column()
+  declare segments: Buffer
+  @column()
+  declare size: bigint | number | null
+  @column.dateTime({ autoCreate: true, autoUpdate: true })
+  declare updatedAt: DateTime | null
+}
+
 export class GroupSchema extends BaseModel {
   static $columns = ['active', 'backfillNextId', 'backfillUntilId', 'createdAt', 'fetchBodies', 'id', 'lastIndexedId', 'lastQueuedId', 'name', 'updatedAt'] as const
   $columns = GroupSchema.$columns