diff --git a/client/components/Api/Api.vue b/client/components/Api/Api.vue
index a4703c0..c2fb977 100644
--- a/client/components/Api/Api.vue
+++ b/client/components/Api/Api.vue
@@ -231,12 +231,12 @@ class Api {
         return await this.request({action: 'get-genre-tree'});
     }    
 
-    async getBookLink(bookId) {
-        return await this.request({action: 'get-book-link', bookId}, 120);
+    async getBookLink(bookUid) {
+        return await this.request({action: 'get-book-link', bookUid}, 120);
     }
 
-    async getBookInfo(bookId) {
-        return await this.request({action: 'get-book-info', bookId}, 120);
+    async getBookInfo(bookUid) {
+        return await this.request({action: 'get-book-info', bookUid}, 120);
     }
 
     async getConfig() {
diff --git a/client/components/Search/BaseList.js b/client/components/Search/BaseList.js
index ad259bb..8db041d 100644
--- a/client/components/Search/BaseList.js
+++ b/client/components/Search/BaseList.js
@@ -130,7 +130,7 @@ export default class BaseList {
 
         try {
             //подготовка
-            const response = await this.api.getBookLink(book.id);
+            const response = await this.api.getBookLink(book._uid);
             
             const link = response.link;
             const href = `${window.location.origin}${link}`;
@@ -164,7 +164,7 @@ export default class BaseList {
                 }
             } else if (action == 'bookInfo') {
                 //информация о книге
-                const response = await this.api.getBookInfo(book.id);
+                const response = await this.api.getBookInfo(book._uid);
                 this.$emit('listEvent', {action: 'bookInfo', data: response.bookInfo});
             }
         } catch(e) {
diff --git a/server/config/base.js b/server/config/base.js
index ced76b7..923a53a 100644
--- a/server/config/base.js
+++ b/server/config/base.js
@@ -16,7 +16,7 @@ module.exports = {
 
     //поправить в случае, если были критические изменения в DbCreator или InpxParser
     //иначе будет рассинхронизация между сервером и клиентом на уровне БД
-    dbVersion: '6',
+    dbVersion: '7',
     dbCacheSize: 5,
 
     maxPayloadSize: 500,//in MB
diff --git a/server/controllers/WebSocketController.js b/server/controllers/WebSocketController.js
index 8f9ed44..566348b 100644
--- a/server/controllers/WebSocketController.js
+++ b/server/controllers/WebSocketController.js
@@ -165,19 +165,19 @@ class WebSocketController {
     }
 
     async getBookLink(req, ws) {
-        if (!utils.hasProp(req, 'bookId'))
-            throw new Error(`bookId is empty`);
+        if (!utils.hasProp(req, 'bookUid'))
+            throw new Error(`bookUid is empty`);
 
-        const result = await this.webWorker.getBookLink(req.bookId);
+        const result = await this.webWorker.getBookLink(req.bookUid);
 
         this.send(result, req, ws);
     }
 
     async getBookInfo(req, ws) {
-        if (!utils.hasProp(req, 'bookId'))
-            throw new Error(`bookId is empty`);
+        if (!utils.hasProp(req, 'bookUid'))
+            throw new Error(`bookUid is empty`);
 
-        const result = await this.webWorker.getBookInfo(req.bookId);
+        const result = await this.webWorker.getBookInfo(req.bookUid);
 
         this.send(result, req, ws);
     }
diff --git a/server/core/DbCreator.js b/server/core/DbCreator.js
index f5a9c6a..3cfc00e 100644
--- a/server/core/DbCreator.js
+++ b/server/core/DbCreator.js
@@ -65,6 +65,8 @@ class DbCreator {
         let librateMap = new Map();//оценка
         let librateArr = [];
 
+        let uidSet = new Set();//уникальные идентификаторы
+
         //stats
         let authorCount = 0;
         let bookCount = 0;
@@ -221,13 +223,14 @@ class DbCreator {
             let filtered = false;
             for (const rec of chunk) {
                 //сначала фильтр
-                if (!filter(rec)) {
+                if (!filter(rec) || uidSet.has(rec._uid)) {
                     rec.id = 0;
                     filtered = true;
                     continue;
                 }
 
                 rec.id = ++id;
+                uidSet.add(rec._uid);
 
                 if (!rec.del) {
                     bookCount++;
@@ -269,6 +272,7 @@ class DbCreator {
         delMap = null;
         dateMap = null;
         librateMap = null;
+        uidSet = null;
 
         await db.close({table: 'book'});
         await db.freeMemory();
@@ -624,6 +628,12 @@ class DbCreator {
             stats.filesDelCount = res.filesDelCount;
         }
 
+        //заодно добавим нужный индекс
+        await db.create({
+            in: 'book',
+            hash: {field: '_uid', type: 'string', depth: 100, unique: true},
+        });
+
         countDone = true;
     }
 }
diff --git a/server/core/InpxParser.js b/server/core/InpxParser.js
index 919e6c3..6e2d864 100644
--- a/server/core/InpxParser.js
+++ b/server/core/InpxParser.js
@@ -1,4 +1,5 @@
 const path = require('path');
+const crypto = require('crypto');
 const ZipReader = require('./ZipReader');
 
 const collectionInfo = 'collection.info';
@@ -98,9 +99,13 @@ class InpxParser {
             if (line[line.length - 1] == '\x0D')
                 line = line.substring(0, line.length - 1);
 
+            const rec = {};
+            //уникальный идентификатор записи
+            const sha256 = crypto.createHash('sha256');
+            rec._uid = sha256.update(line).digest('base64');
+
             //парсим запись
             const parts = line.split('\x04');
-            const rec = {};
 
             const len = (parts.length > structLen ? structLen : parts.length);
             for (let i = 0; i < len; i++) {
diff --git a/server/core/RemoteLib.js b/server/core/RemoteLib.js
index 8681931..0ab0c8e 100644
--- a/server/core/RemoteLib.js
+++ b/server/core/RemoteLib.js
@@ -58,9 +58,9 @@ class RemoteLib {
         }
     }
 
-    async downloadBook(bookId) {
+    async downloadBook(bookUid) {
         try {
-            const response = await await this.wsRequest({action: 'get-book-link', bookId});
+            const response = await await this.wsRequest({action: 'get-book-link', bookUid});
             const link = response.link;
 
             const buf = await this.down.load(`${this.remoteHost}${link}`, {decompress: false});
diff --git a/server/core/WebWorker.js b/server/core/WebWorker.js
index a73deb5..547f55d 100644
--- a/server/core/WebWorker.js
+++ b/server/core/WebWorker.js
@@ -354,7 +354,7 @@ class WebWorker {
         }
     }
 
-    async restoreBook(bookId, bookPath, downFileName) {
+    async restoreBook(bookUid, bookPath, downFileName) {
         const db = this.db;
 
         let extractedFile = '';
@@ -364,7 +364,7 @@ class WebWorker {
             extractedFile = await this.extractBook(bookPath);
             hash = await utils.getFileHash(extractedFile, 'sha256', 'hex');
         } else {
-            hash = await this.remoteLib.downloadBook(bookId);
+            hash = await this.remoteLib.downloadBook(bookUid);
         }
 
         const link = `${this.config.filesPathStatic}/${hash}`;
@@ -402,7 +402,7 @@ class WebWorker {
         return link;
     }
 
-    async getBookLink(bookId) {
+    async getBookLink(bookUid) {
         this.checkMyState();
 
         try {
@@ -410,11 +410,11 @@ class WebWorker {
             let link = '';
 
             //найдем bookPath и downFileName
-            let rows = await db.select({table: 'book', where: `@@id(${db.esc(bookId)})`});
+            let rows = await db.select({table: 'book', where: `@@hash('_uid', ${db.esc(bookUid)})`});
             if (!rows.length)
                 throw new Error('404 Файл не найден');
 
-            const book = rows[0];            
+            const book = rows[0];
             let downFileName = book.file;
             const author = book.author.split(',');
             const at = [author[0], book.title];
@@ -443,7 +443,7 @@ class WebWorker {
             }
 
             if (!link) {
-                link = await this.restoreBook(bookId, bookPath, downFileName)
+                link = await this.restoreBook(bookUid, bookPath, downFileName)
             }
 
             if (!link)
@@ -458,13 +458,13 @@ class WebWorker {
         }
     }
 
-    async getBookInfo(bookId) {
+    async getBookInfo(bookUid) {
         this.checkMyState();
 
         try {
             const db = this.db;
 
-            let bookInfo = await this.getBookLink(bookId);
+            let bookInfo = await this.getBookLink(bookUid);
             const hash = path.basename(bookInfo.link);
             const bookFile = `${this.config.filesDir}/${hash}`;
             const bookFileInfo = `${bookFile}.i.json`;
@@ -472,7 +472,9 @@ class WebWorker {
             const restoreBookInfo = async(info) => {
                 const result = {};
 
-                const rows = await db.select({table: 'book', where: `@@id(${db.esc(bookId)})`});
+                let rows = await db.select({table: 'book', where: `@@hash('_uid', ${db.esc(bookUid)})`});
+                if (!rows.length)
+                    throw new Error('404 Файл не найден');
                 const book = rows[0];
 
                 result.book = book;