refactor(hocuspocus): remove nested-to-flat schema migration

Drop the batch migration, transform helpers, and on-load rewrite now
that stored documents use the flat heading schema everywhere

Made-with: Cursor

Author: HMarzban

packages/hocuspocus.server/package.json

@@ -21,8 +21,6 @@
     "prisma:migrate:dev": "bun --env-file ../../.env.local prisma migrate dev",
     "prisma:generate": "bun --env-file ../../.env.local prisma generate --schema=./prisma/schema.prisma",
     "fix:migration": "bun scripts/fix-migration.ts",
-    "migrate:nested-to-flat": "bun --env-file ../../.env.local src/scripts/migrate-nested-to-flat.ts",
-    "migrate:nested-to-flat:dry": "bun --env-file ../../.env.local src/scripts/migrate-nested-to-flat.ts --dry-run",
     "update:packages": "bunx npm-check-updates -u"
   },
   "keywords": [],

packages/hocuspocus.server/src/config/hocuspocus.config.ts

@@ -1,4 +1,3 @@
-import { TiptapTransformer } from '@hocuspocus/transformer'
 import * as Y from 'yjs'
 import { Database } from '@hocuspocus/extension-database'
 import { Throttle } from '@hocuspocus/extension-throttle'
@@ -11,8 +10,6 @@ import { RedisSubscriberExtension } from '../extensions/redis-subscriber.extensi
 import { DocumentViewsExtension } from '../extensions/document-views.extension'
 import { prisma } from '../lib/prisma'
 import { dbLogger } from '../lib/logger'
-import { isOldSchema, transformNestedToFlat } from '../lib/schema-migration'
-import { migrationExtensions } from '../lib/migration-extensions'
 
 export { Database }
 
@@ -84,36 +81,6 @@ const configureExtensions = () => {
 
           const rawState = doc?.data ?? generateDefaultState()
 
-          // On-load migration: convert old nested schema to flat on first open.
-          // Controlled by ENABLE_SCHEMA_MIGRATION env var — remove after all docs migrated.
-          if (doc?.data && checkEnvBolean(process.env.ENABLE_SCHEMA_MIGRATION)) {
-            try {
-              const ydoc = new Y.Doc()
-              const buffer = rawState instanceof Buffer ? new Uint8Array(rawState) : rawState
-              Y.applyUpdate(ydoc, buffer)
-              const pmJson = TiptapTransformer.fromYdoc(ydoc, 'default') as Record<
-                string,
-                unknown
-              > | null
-
-              if (pmJson && isOldSchema(pmJson as any)) {
-                dbLogger.info({ documentName }, 'On-load schema migration: nested → flat')
-                const flatJson = transformNestedToFlat(pmJson as any)
-                const newYdoc = TiptapTransformer.toYdoc(
-                  flatJson as unknown as Record<string, unknown>,
-                  'default',
-                  migrationExtensions
-                )
-                return Y.encodeStateAsUpdate(newYdoc)
-              }
-            } catch (migrationErr) {
-              dbLogger.warn(
-                { err: migrationErr, documentName },
-                'Schema migration failed, serving original'
-              )
-            }
-          }
-
           return rawState
         } catch (err) {
           dbLogger.error({ err }, 'Error fetching document data')