Release bookkeeping migration: take the files locks first

The trigger swap deadlocked with ingest on homelab (DROP TRIGGER locks
the partitions one by one); LOCK TABLE up front cannot.

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

database/migrations/1768620765190_release_totals_per_statement.ts

@@ -22,8 +22,11 @@ import { BaseSchema } from '@adonisjs/lucid/schema'
 export default class extends BaseSchema {
   async up() {
     const q = (sql: string) => this.db.rawQuery(sql)
-    // Swapping triggers locks files and its partitions: give up rather than queue every writer behind it.
+    // Swapping triggers locks files and its partitions. Taken first and in one statement: a
+    // DROP TRIGGER later in the transaction deadlocked with ingest (2026-10-06). Give up rather
+    // than queue every writer behind it for long.
     await q(`SET LOCAL lock_timeout = '2min'`)
+    await q(`LOCK TABLE files, release_files IN ACCESS EXCLUSIVE MODE`)
     // Built CONCURRENTLY by hand on homelab (2026-10-06); IF NOT EXISTS keeps that one.
     await q(`CREATE INDEX IF NOT EXISTS release_files_release_size_idx ON release_files (release_id, size)`)