diff --git a/db.sql b/db.sql
index cd19ade..20ad7e9 100644
--- a/db.sql
+++ b/db.sql
@@ -27,4 +27,6 @@ CREATE TABLE IF NOT EXISTS chain (
     FOREIGN KEY(user) REFERENCES user(id)
 );
 
-CREATE UNIQUE INDEX IF NOT EXISTS chain_value_next ON chain(user, value, next);
\ No newline at end of file
+CREATE UNIQUE INDEX IF NOT EXISTS chain_value_next ON chain(user, value, next);
+
+CREATE INDEX IF NOT EXISTS markov_all_index ON chain(value);