diff --git a/src/entity/brizzi_history.ts b/src/entity/brizzi_history.ts
index 770795b..6852ac2 100644
--- a/src/entity/brizzi_history.ts
+++ b/src/entity/brizzi_history.ts
@@ -47,7 +47,7 @@ export class BrizziHistory {
 
     @Column({
         type: 'float8',
-        nullable: false,
+        nullable: true,
     })
     prev_balance: number;
 
@@ -59,7 +59,7 @@ export class BrizziHistory {
 
     @Column({
         type: 'float8',
-        nullable: false,
+        nullable: true,
     })
     last_balance: number;