diff --git a/db/init.js b/db/init.js
index 6bb3033..a3791c0 100644
--- a/db/init.js
+++ b/db/init.js
@@ -124,6 +124,14 @@ client.connect()
           id_file SERIAL REFERENCES file (id) ON DELETE CASCADE,
           PRIMARY KEY (id_series, id_file)
         );
+
+        CREATE TABLE ratio
+        (
+          id_mol VARCHAR(52) UNIQUE,
+          id_series SERIAL REFERENCES series (id) ON DELETE CASCADE,
+          ratio FLOAT,
+          PRIMARY KEY (id_mol, id_series)
+        );
       
         INSERT INTO users (name, email, hash, team)
         VALUES 
diff --git a/db/init.sql b/db/init.sql
index 24f6a21..d69af67 100644
--- a/db/init.sql
+++ b/db/init.sql
@@ -118,6 +118,14 @@ CREATE TABLE daughter
   PRIMARY KEY (id_series, id_file)
 );
 
+CREATE TABLE ratio
+(
+  id_mol VARCHAR(52) UNIQUE,
+  id_series SERIAL REFERENCES series (id) ON DELETE CASCADE,
+  ratio FLOAT,
+  PRIMARY KEY (id_mol, id_series)
+);
+
 INSERT INTO users (name, email, hash, team)
 VALUES 
 ('root_ep2m2', 'admin@ep2m2.bzh',