fix db

backend/src/main/java/com/storycove/config/DatabaseMigrationRunner.java

@@ -42,6 +42,10 @@ public class DatabaseMigrationRunner implements CommandLineRunner {
         "storycove_secret"
     );
 
+    // SQL for last_completed_at column migration (idempotent)
+    private static final String LAST_COMPLETED_AT_MIGRATION =
+        "ALTER TABLE stories ADD COLUMN IF NOT EXISTS last_completed_at TIMESTAMP;";
+
     // SQL for backup_jobs table migration (idempotent)
     private static final String BACKUP_JOBS_MIGRATION = """
         CREATE TABLE IF NOT EXISTS backup_jobs (
@@ -100,12 +104,17 @@ public class DatabaseMigrationRunner implements CommandLineRunner {
                 dbUsername,
                 dbPassword
         )) {
+            // Apply last_completed_at column migration
+            try (Statement stmt = conn.createStatement()) {
+                stmt.execute(LAST_COMPLETED_AT_MIGRATION);
+            }
+
             // Apply backup_jobs migration
             try (Statement stmt = conn.createStatement()) {
                 stmt.execute(BACKUP_JOBS_MIGRATION);
             }
 
-            logger.debug("Applied backup_jobs migration to {}", database);
+            logger.debug("Applied migrations to {}", database);
         }
     }
 }