diff --git a/models/server-core/src/index.ts b/models/server-core/src/index.ts
index 0a92306c04..6ef15b74a5 100644
--- a/models/server-core/src/index.ts
+++ b/models/server-core/src/index.ts
@@ -14,27 +14,19 @@
 // limitations under the License.
 //
 
-import { type Builder, Model, Mixin } from '@hcengineering/model'
+import { Mixin, Model, type Builder } from '@hcengineering/model'
 import { TClass, TDoc } from '@hcengineering/model-core'
 import type { Resource } from '@hcengineering/platform'
 
-import core, {
-  type Class,
-  DOMAIN_MODEL,
-  type Doc,
-  type DocumentQuery,
-  type FindOptions,
-  type FindResult,
-  type Hierarchy,
-  type Ref
-} from '@hcengineering/core'
+import core, { DOMAIN_MODEL } from '@hcengineering/core'
 import type {
+  ClassSearchConfig,
   ObjectDDParticipant,
-  Trigger,
-  TriggerFunc,
+  ObjectDDParticipantFunc,
   SearchPresenter,
   SearchPresenterFunc,
-  ClassSearchConfig
+  Trigger,
+  TriggerFunc
 } from '@hcengineering/server-core'
 import serverCore from '@hcengineering/server-core'
 
@@ -47,17 +39,7 @@ export class TTrigger extends TDoc implements Trigger {
 
 @Model(serverCore.mixin.ObjectDDParticipant, core.class.Class)
 export class TObjectDDParticipant extends TClass implements ObjectDDParticipant {
-  collectDocs!: Resource<
-  (
-    doc: Doc,
-    hiearachy: Hierarchy,
-    findAll: <T extends Doc>(
-      clazz: Ref<Class<T>>,
-      query: DocumentQuery<T>,
-      options?: FindOptions<T>
-    ) => Promise<FindResult<T>>
-  ) => Promise<Doc[]>
-  >
+  collectDocs!: Resource<ObjectDDParticipantFunc>
 }
 
 @Mixin(serverCore.mixin.SearchPresenter, core.class.Class)
diff --git a/server-plugins/calendar/src/index.ts b/server-plugins/calendar/src/index.ts
index cf632b612f..3153f3fc77 100644
--- a/server-plugins/calendar/src/index.ts
+++ b/server-plugins/calendar/src/index.ts
@@ -14,11 +14,10 @@
 // limitations under the License.
 //
 
-import { Class, Doc, DocumentQuery, FindOptions, FindResult, Hierarchy, Ref } from '@hcengineering/core'
 import type { Plugin, Resource } from '@hcengineering/platform'
 import { plugin } from '@hcengineering/platform'
+import type { ObjectDDParticipantFunc, TriggerFunc } from '@hcengineering/server-core'
 import { Presenter } from '@hcengineering/server-notification'
-import type { TriggerFunc } from '@hcengineering/server-core'
 
 /**
  * @public
@@ -32,17 +31,7 @@ export default plugin(serverCalendarId, {
   function: {
     ReminderHTMLPresenter: '' as Resource<Presenter>,
     ReminderTextPresenter: '' as Resource<Presenter>,
-    FindReminders: '' as Resource<
-    (
-      doc: Doc,
-      hiearachy: Hierarchy,
-      findAll: <T extends Doc>(
-        clazz: Ref<Class<T>>,
-        query: DocumentQuery<T>,
-        options?: FindOptions<T>
-      ) => Promise<FindResult<T>>
-    ) => Promise<Doc[]>
-    >
+    FindReminders: '' as Resource<ObjectDDParticipantFunc>
   },
   trigger: {
     OnPersonAccountCreate: '' as Resource<TriggerFunc>
diff --git a/server-plugins/chunter/src/index.ts b/server-plugins/chunter/src/index.ts
index ba3854873a..398c6e1e39 100644
--- a/server-plugins/chunter/src/index.ts
+++ b/server-plugins/chunter/src/index.ts
@@ -13,11 +13,10 @@
 // limitations under the License.
 //
 
-import { Class, Doc, DocumentQuery, FindOptions, FindResult, Hierarchy, Ref } from '@hcengineering/core'
 import type { Plugin, Resource } from '@hcengineering/platform'
 import { plugin } from '@hcengineering/platform'
-import { TriggerFunc } from '@hcengineering/server-core'
-import { Presenter, TypeMatchFunc, NotificationContentProvider } from '@hcengineering/server-notification'
+import { ObjectDDParticipantFunc, TriggerFunc } from '@hcengineering/server-core'
+import { NotificationContentProvider, Presenter, TypeMatchFunc } from '@hcengineering/server-notification'
 
 /**
  * @public
@@ -34,17 +33,7 @@ export default plugin(serverChunterId, {
     OnMessageSent: '' as Resource<TriggerFunc>
   },
   function: {
-    CommentRemove: '' as Resource<
-    (
-      doc: Doc,
-      hiearachy: Hierarchy,
-      findAll: <T extends Doc>(
-        clazz: Ref<Class<T>>,
-        query: DocumentQuery<T>,
-        options?: FindOptions<T>
-      ) => Promise<FindResult<T>>
-    ) => Promise<Doc[]>
-    >,
+    CommentRemove: '' as Resource<ObjectDDParticipantFunc>,
     ChannelHTMLPresenter: '' as Resource<Presenter>,
     ChannelTextPresenter: '' as Resource<Presenter>,
     IsDirectMessage: '' as TypeMatchFunc,
diff --git a/server-plugins/gmail/src/index.ts b/server-plugins/gmail/src/index.ts
index 89007b3d50..8acb3f3ed4 100644
--- a/server-plugins/gmail/src/index.ts
+++ b/server-plugins/gmail/src/index.ts
@@ -14,11 +14,10 @@
 // limitations under the License.
 //
 
-import { Class, Doc, DocumentQuery, FindOptions, FindResult, Hierarchy, Ref } from '@hcengineering/core'
 import type { Plugin, Resource } from '@hcengineering/platform'
 import { plugin } from '@hcengineering/platform'
+import { ObjectDDParticipantFunc, TriggerFunc } from '@hcengineering/server-core'
 import { TypeMatchFunc } from '@hcengineering/server-notification'
-import { TriggerFunc } from '@hcengineering/server-core'
 
 /**
  * @public
@@ -34,16 +33,6 @@ export default plugin(serverGmailId, {
   },
   function: {
     IsIncomingMessage: '' as TypeMatchFunc,
-    FindMessages: '' as Resource<
-    (
-      doc: Doc,
-      hiearachy: Hierarchy,
-      findAll: <T extends Doc>(
-        clazz: Ref<Class<T>>,
-        query: DocumentQuery<T>,
-        options?: FindOptions<T>
-      ) => Promise<FindResult<T>>
-    ) => Promise<Doc[]>
-    >
+    FindMessages: '' as Resource<ObjectDDParticipantFunc>
   }
 })
diff --git a/server-plugins/tags/src/index.ts b/server-plugins/tags/src/index.ts
index 9467a40cdc..f622db0ebb 100644
--- a/server-plugins/tags/src/index.ts
+++ b/server-plugins/tags/src/index.ts
@@ -13,10 +13,9 @@
 // limitations under the License.
 //
 
-import { Class, Doc, Hierarchy, Ref, FindResult, FindOptions, DocumentQuery } from '@hcengineering/core'
 import type { Plugin, Resource } from '@hcengineering/platform'
 import { plugin } from '@hcengineering/platform'
-import { TriggerFunc } from '@hcengineering/server-core'
+import { ObjectDDParticipantFunc, TriggerFunc } from '@hcengineering/server-core'
 
 /**
  * @public
@@ -31,16 +30,6 @@ export default plugin(serverTagsId, {
     onTagReference: '' as Resource<TriggerFunc>
   },
   function: {
-    TagElementRemove: '' as Resource<
-    (
-      doc: Doc,
-      hiearachy: Hierarchy,
-      findAll: <T extends Doc>(
-        clazz: Ref<Class<T>>,
-        query: DocumentQuery<T>,
-        options?: FindOptions<T>
-      ) => Promise<FindResult<T>>
-    ) => Promise<Doc[]>
-    >
+    TagElementRemove: '' as Resource<ObjectDDParticipantFunc>
   }
 })
diff --git a/server-plugins/telegram/src/index.ts b/server-plugins/telegram/src/index.ts
index 89fe3265b6..9481f9dde9 100644
--- a/server-plugins/telegram/src/index.ts
+++ b/server-plugins/telegram/src/index.ts
@@ -14,11 +14,10 @@
 // limitations under the License.
 //
 
-import { Class, Doc, DocumentQuery, FindOptions, FindResult, Hierarchy, Ref } from '@hcengineering/core'
 import type { Plugin, Resource } from '@hcengineering/platform'
 import { plugin } from '@hcengineering/platform'
+import { ObjectDDParticipantFunc, TriggerFunc } from '@hcengineering/server-core'
 import { TypeMatchFunc } from '@hcengineering/server-notification'
-import { TriggerFunc } from '@hcengineering/server-core'
 
 /**
  * @public
@@ -34,16 +33,6 @@ export default plugin(serverTelegramId, {
   },
   function: {
     IsIncomingMessage: '' as TypeMatchFunc,
-    FindMessages: '' as Resource<
-    (
-      doc: Doc,
-      hiearachy: Hierarchy,
-      findAll: <T extends Doc>(
-        clazz: Ref<Class<T>>,
-        query: DocumentQuery<T>,
-        options?: FindOptions<T>
-      ) => Promise<FindResult<T>>
-    ) => Promise<Doc[]>
-    >
+    FindMessages: '' as Resource<ObjectDDParticipantFunc>
   }
 })
diff --git a/server/core/src/types.ts b/server/core/src/types.ts
index 0501ed3a4e..89d8e09c78 100644
--- a/server/core/src/types.ts
+++ b/server/core/src/types.ts
@@ -27,6 +27,9 @@ import {
   ModelDb,
   Obj,
   Ref,
+  SearchOptions,
+  SearchQuery,
+  SearchResult,
   ServerStorage,
   Space,
   Storage,
@@ -34,13 +37,10 @@ import {
   Tx,
   TxFactory,
   TxResult,
-  WorkspaceId,
-  SearchQuery,
-  SearchOptions,
-  SearchResult
+  WorkspaceId
 } from '@hcengineering/core'
 import { MinioService } from '@hcengineering/minio'
-import type { Resource, Asset } from '@hcengineering/platform'
+import type { Asset, Resource } from '@hcengineering/platform'
 import { Readable } from 'stream'
 
 /**
@@ -321,19 +321,19 @@ export interface WithFind {
  */
 export interface ObjectDDParticipant extends Class<Obj> {
   // Collect more items to be deleted if parent document is deleted.
-  collectDocs: Resource<
-  (
-    doc: Doc,
-    hiearachy: Hierarchy,
-    findAll: <T extends Doc>(
-      clazz: Ref<Class<T>>,
-      query: DocumentQuery<T>,
-      options?: FindOptions<T>
-    ) => Promise<FindResult<T>>
-  ) => Promise<Doc[]>
-  >
+  collectDocs: Resource<ObjectDDParticipantFunc>
 }
 
+export type ObjectDDParticipantFunc = (
+  doc: Doc,
+  hiearachy: Hierarchy,
+  findAll: <T extends Doc>(
+    clazz: Ref<Class<T>>,
+    query: DocumentQuery<T>,
+    options?: FindOptions<T>
+  ) => Promise<FindResult<T>>
+) => Promise<Doc[]>
+
 /**
  * @public
  */