par2_files, fragments and probe_cache with the chunks (CHUNK_TABLESPACE)

~20 GB of the NVMe, read by key only; the catalog was at its cap and history
paused. Moved on homelab by hand (3 min, writers stopped; the cap raised to
100); the migration does the same on a new deploy.

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

database/migrations/1770000003200_rarely_read_tables_with_chunks.ts

@@ -0,0 +1,32 @@
+import { BaseSchema } from '@adonisjs/lucid/schema'
+import env from '#start/env'
+
+/**
+ * par2_files, fragments and probe_cache, with their indexes, in CHUNK_TABLESPACE (the HDD): ~20 GB of the NVMe at
+ * 42M releases, read by key only (the merger, the fragment merger, the prober). The catalog was at its
+ * CATALOG_MAX_NVME_GB cap and history paused (LOG.md 2026-10-14 (55)). Homelab was moved by hand first (3 min,
+ * with the writers stopped); a no-op where they're there already.
+ */
+const TABLES = ['par2_files', 'fragments', 'probe_cache']
+
+export default class extends BaseSchema {
+  async up() {
+    const tablespace = env.get('CHUNK_TABLESPACE')
+    if (!tablespace) return
+    this.defer(async (db) => {
+      for (const table of TABLES) {
+        const { rows } = await db.rawQuery(
+          `SELECT c.relname, c.relkind FROM pg_class c LEFT JOIN pg_tablespace t ON t.oid = c.reltablespace
+           WHERE (c.relname = ? OR c.oid IN (SELECT indexrelid FROM pg_index WHERE indrelid = ?::regclass))
+             AND coalesce(t.spcname, 'pg_default') <> ?`,
+          [table, table, tablespace]
+        )
+        for (const { relname, relkind } of rows) {
+          await db.rawQuery(`ALTER ${relkind === 'i' ? 'INDEX' : 'TABLE'} ${relname} SET TABLESPACE ${tablespace}`)
+        }
+      }
+    })
+  }
+
+  async down() {}
+}