diff --git a/src/background/api.js b/src/background/api.js
index 93d8e39..b7a43dc 100644
--- a/src/background/api.js
+++ b/src/background/api.js
@@ -1,4 +1,5 @@
 const ipaddr = require('ipaddr.js');
+import forBigTable from './forBigTable'
 
 module.exports = ({
 	sphinx,
@@ -622,23 +623,10 @@ module.exports = ({
 			console.log('removed torrents by filter:', toRemove.length)
 		}
 
-		const checker = (index = 0) => {
-			sphinx.query(`SELECT * FROM torrents LIMIT ${index},50000`, (err, torrents) => {
-				if(err || torrents.length == 0)
-				{
-					done()
-					return
-				}
-				
-				torrents.forEach((torrent) => {
-					if(!checkTorrent(torrent))
-						toRemove.push(torrent)
-				})
-
-				checker(index + torrents.length)
-			});
-		}
-		checker()
+		forBigTable(sphinx, 'torrents', (torrent) => {
+			if(!checkTorrent(torrent))
+				toRemove.push(torrent)
+		}, done)
 	})
 
 	let socketIPV4 = () => {
diff --git a/src/background/forBigTable.js b/src/background/forBigTable.js
new file mode 100644
index 0000000..754cb86
--- /dev/null
+++ b/src/background/forBigTable.js
@@ -0,0 +1,18 @@
+export default (sphinx, table, callback, doneCallback, max = 1000) => new Promise((done) => {
+    const checker = (index = 0) => {
+        sphinx.query(`SELECT * FROM ${table} WHERE id > ${index} LIMIT ${max}`, (err, torrents) => {
+            if(err || torrents.length == 0)
+            {
+                if(err)
+                    console.log('big table parse error', err)
+                if(doneCallback)
+                    doneCallback(true)
+                done(true)
+                return
+            }
+            torrents.forEach(callback)
+            checker(torrents[torrents.length - 1].id)
+        });
+    }
+    checker()
+})
\ No newline at end of file