feat(ai-chat): show RAG indexing coverage in AI settings

Display "Indexed N of M pages" on the AI provider settings page so admins
can see how much of the wiki is covered by vector-RAG semantic search.

- page-embedding.repo: add countIndexedPages() — distinct non-deleted pages
  that have stored embeddings in the workspace
- page.repo: add countByWorkspace() — total non-deleted pages
- ai-settings.service: compute both counts in getMasked() (Promise.all) and
  return them with the masked settings; inject PageEmbeddingRepo + PageRepo
- MaskedAiSettings / IAiSettings: add indexedPages + totalPages
- ai-provider-settings: render a dimmed coverage line under "Embedding model"
- i18n: add the "Indexed {{indexed}} of {{total}} pages" key (en-US, ru-RU)

apps/server/src/database/repos/ai-chat/page-embedding.repo.ts

@@ -157,4 +157,28 @@ export class PageEmbeddingRepo {
       distance: Number(row.distance),
     }));
   }
+
+  /**
+   * Count DISTINCT non-deleted pages that have at least one embedding row in this
+   * workspace — i.e. how many pages currently have stored embeddings.
+   *
+   * NOTE: this counts pages embedded by ANY model dimension, whereas
+   * `searchByEmbedding` only serves rows matching the active model's dimension.
+   * After switching the embedding model, this number can therefore exceed the
+   * set of pages actually reachable by search until those pages are re-indexed.
+   * It is an indexing-coverage indicator, not an exact searchable-page count.
+   */
+  async countIndexedPages(workspaceId: string): Promise<number> {
+    const row = await this.db
+      .selectFrom('pageEmbeddings as pe')
+      .innerJoin('pages as p', 'p.id', 'pe.pageId')
+      .where('pe.workspaceId', '=', workspaceId)
+      // Exclude trashed pages and any soft-deleted embedding rows (defence in
+      // depth: embeddings are hard-deleted, so pe.deletedAt is normally null).
+      .where('p.deletedAt', 'is', null)
+      .where('pe.deletedAt', 'is', null)
+      .select((eb) => eb.fn.count('pe.pageId').distinct().as('count'))
+      .executeTakeFirst();
+    return Number(row?.count ?? 0);
+  }
 }

apps/server/src/database/repos/page/page.repo.ts

@@ -181,6 +181,20 @@ export class PageRepo {
     return result;
   }
 
+  /**
+   * Count non-deleted pages in a workspace. Used by the AI settings page to show
+   * RAG indexing coverage ("N of M pages indexed").
+   */
+  async countByWorkspace(workspaceId: string): Promise<number> {
+    const row = await this.db
+      .selectFrom('pages')
+      .where('workspaceId', '=', workspaceId)
+      .where('deletedAt', 'is', null)
+      .select((eb) => eb.fn.countAll().as('count'))
+      .executeTakeFirst();
+    return Number(row?.count ?? 0);
+  }
+
   async deletePage(pageId: string): Promise<void> {
     let query = this.db.deleteFrom('pages');
 

apps/server/src/integrations/ai/ai-settings.service.ts

@@ -1,6 +1,8 @@
 import { BadRequestException, Injectable } from '@nestjs/common';
 import { WorkspaceRepo } from '@docmost/db/repos/workspace/workspace.repo';
 import { AiProviderCredentialsRepo } from '@docmost/db/repos/ai-chat/ai-provider-credentials.repo';
+import { PageEmbeddingRepo } from '@docmost/db/repos/ai-chat/page-embedding.repo';
+import { PageRepo } from '@docmost/db/repos/page/page.repo';
 import { SecretBoxService } from '../crypto/secret-box';
 import {
   AiDriver,
@@ -36,6 +38,8 @@ export class AiSettingsService {
   constructor(
     private readonly workspaceRepo: WorkspaceRepo,
     private readonly aiProviderCredentialsRepo: AiProviderCredentialsRepo,
+    private readonly pageEmbeddingRepo: PageEmbeddingRepo,
+    private readonly pageRepo: PageRepo,
     private readonly secretBox: SecretBoxService,
   ) {}
 
@@ -82,7 +86,8 @@ export class AiSettingsService {
 
   /**
    * Masked settings safe for admin clients. NEVER includes the key (even
-   * encrypted); only `hasApiKey` for the current driver.
+   * encrypted); only `hasApiKey` for the current driver. Also reports RAG
+   * indexing coverage (`indexedPages`/`totalPages`) for the settings UI.
    */
   async getMasked(workspaceId: string): Promise<MaskedAiSettings> {
     const provider = await this.readProvider(workspaceId);
@@ -96,6 +101,11 @@ export class AiSettingsService {
       hasApiKey = !!creds?.apiKeyEnc;
     }
 
+    const [indexedPages, totalPages] = await Promise.all([
+      this.pageEmbeddingRepo.countIndexedPages(workspaceId),
+      this.pageRepo.countByWorkspace(workspaceId),
+    ]);
+
     return {
       driver: provider.driver,
       chatModel: provider.chatModel,
@@ -103,6 +113,8 @@ export class AiSettingsService {
       baseUrl: provider.baseUrl,
       systemPrompt: provider.systemPrompt,
       hasApiKey,
+      indexedPages,
+      totalPages,
     };
   }
 

apps/server/src/integrations/ai/ai.types.ts

@@ -44,4 +44,7 @@ export interface MaskedAiSettings {
   baseUrl?: string;
   systemPrompt?: string;
   hasApiKey: boolean;
+  // RAG indexing coverage for the settings UI.
+  indexedPages: number;
+  totalPages: number;
 }