diff --git a/src/db.rs b/src/db.rs
index 716a238..8b96536 100644
--- a/src/db.rs
+++ b/src/db.rs
@@ -354,6 +354,7 @@ pub(crate) async fn add_sentence(
 
     // Save stemmed words
     let words = mystem.stemming(text).await?;
+    conn.execute("BEGIN TRANSACTION", params![]);
     for word in words {
         match add_word(&word).await {
             Ok(id) => {
@@ -366,7 +367,7 @@ pub(crate) async fn add_sentence(
             Err(_) => debug!("Word {} is in stop list.", &word),
         }
     }
-
+    conn.execute("END TRANSACTION", params![]);
     Ok(())
 }
 
@@ -405,6 +406,10 @@ pub(crate) async fn get_top(
 
 // SCHEME
 static SCHEME: &str = "
+PRAGMA foreign_keys = off;
+BEGIN TRANSACTION;
+
+-- Table: alert
 CREATE TABLE IF NOT EXISTS alert (
     conf_id TEXT NOT NULL,
     user_id TEXT NOT NULL,
@@ -412,6 +417,9 @@ CREATE TABLE IF NOT EXISTS alert (
     time    TEXT NOT NULL,
     message TEXT
 );
+
+
+-- Table: conf
 CREATE TABLE IF NOT EXISTS conf (
     id    NUMERIC NOT NULL
                   UNIQUE,
@@ -421,17 +429,26 @@ CREATE TABLE IF NOT EXISTS conf (
         id
     )
 );
+
+
+-- Table: file
 CREATE TABLE IF NOT EXISTS file (
     path    TEXT   NOT NULL,
     user_id TEXT   NOT NULL,
     conf_id TEXT   NOT NULL,
     file_id STRING PRIMARY KEY
 );
+
+
+-- Table: messages
 CREATE TABLE IF NOT EXISTS messages (
     id   INTEGER NOT NULL
                  PRIMARY KEY AUTOINCREMENT,
     text TEXT    UNIQUE
 );
+
+
+-- Table: relations
 CREATE TABLE IF NOT EXISTS relations (
     id      INTEGER NOT NULL
                     PRIMARY KEY AUTOINCREMENT,
@@ -453,6 +470,9 @@ CREATE TABLE IF NOT EXISTS relations (
     )
     REFERENCES conf (id)
 );
+
+
+-- Table: reset
 CREATE TABLE IF NOT EXISTS reset (
     id          INTEGER PRIMARY KEY AUTOINCREMENT,
     user_id     INTEGER,
@@ -464,9 +484,15 @@ CREATE TABLE IF NOT EXISTS reset (
     )
     REFERENCES user (id)
 );
+
+
+-- Table: stop_words
 CREATE TABLE IF NOT EXISTS stop_words (
     word TEXT
 );
+
+
+-- Table: user
 CREATE TABLE IF NOT EXISTS user (
     id         INTEGER NOT NULL
                        UNIQUE,
@@ -479,7 +505,48 @@ CREATE TABLE IF NOT EXISTS user (
     )
     ON CONFLICT REPLACE
 );
+
+
+-- Table: word
 CREATE TABLE IF NOT EXISTS word (
     id   INTEGER PRIMARY KEY AUTOINCREMENT,
     word TEXT    UNIQUE
-);";
+);
+
+
+-- Index: conf_ids
+CREATE INDEX IF NOT EXISTS conf_ids ON conf (
+    id
+);
+
+
+-- Index: file_ids
+CREATE INDEX IF NOT EXISTS file_ids ON file (
+    file_id
+);
+
+
+-- Index: relations_ids
+CREATE INDEX IF NOT EXISTS relations_ids ON relations (
+    conf_id,
+    word_id,
+    user_id,
+    msg_id
+);
+
+
+-- Index: user_ids
+CREATE INDEX IF NOT EXISTS user_ids ON user (
+    id,
+    username
+);
+
+
+-- Index: word_id
+CREATE INDEX IF NOT EXISTS word_id ON word (
+    id
+);
+
+
+COMMIT TRANSACTION;
+PRAGMA foreign_keys = on;";