diff --git a/database/createDb.js b/database/createDb.js
index 3b15864..ef6fb02 100644
--- a/database/createDb.js
+++ b/database/createDb.js
@@ -271,7 +271,8 @@ async function createDatabase() {
               user_id INT NOT NULL,
               document_type ENUM('personal_id', 'company_id', 'signature', 'contract', 'other') NOT NULL,
               contract_type ENUM('contract','gdpr') NOT NULL DEFAULT 'contract',
-              object_storage_id VARCHAR(255) UNIQUE NOT NULL,
+              object_storage_id VARCHAR(255) UNIQUE NULL,
+              signatureBase64 LONGTEXT NULL,
               original_filename VARCHAR(255),
               file_size INT,
               mime_type VARCHAR(100),
@@ -292,6 +293,14 @@ async function createDatabase() {
         await connection.query(`
           CREATE INDEX IF NOT EXISTS idx_user_contract_type ON user_documents (user_id, contract_type);
         `);
+        await connection.query(`
+          ALTER TABLE user_documents 
+          MODIFY COLUMN object_storage_id VARCHAR(255) NULL;
+        `);
+        await connection.query(`
+          ALTER TABLE user_documents 
+          ADD COLUMN IF NOT EXISTS signatureBase64 LONGTEXT NULL AFTER object_storage_id;
+        `);
         console.log('✅ User documents table created/verified');
 
         // 8c. document_templates table: Stores template metadata and object storage keys