diff --git a/backend/internal/database/migrations/0035_weekly_report.sql b/backend/internal/database/migrations/0035_weekly_report.sql
index 8f76b80..be2a2d3 100644
--- a/backend/internal/database/migrations/0035_weekly_report.sql
+++ b/backend/internal/database/migrations/0035_weekly_report.sql
@@ -1,5 +1,5 @@
 CREATE TABLE IF NOT EXISTS weekly_reports (
-  report_id INTEGER PRIMARY KEY AUTOINCREMENT,
+  report_id INTEGER AUTO_INCREMENT UNIQUE,
   user_id INTEGER NOT NULL,
   project_id INTEGER NOT NULL,
   week INTEGER NOT NULL,
@@ -12,5 +12,6 @@ CREATE TABLE IF NOT EXISTS weekly_reports (
   signed_by INTEGER,
   FOREIGN KEY (user_id) REFERENCES users(id),
   FOREIGN KEY (project_id) REFERENCES projects(id),
-  FOREIGN KEY (signed_by) REFERENCES users(id)
+  FOREIGN KEY (signed_by) REFERENCES users(id),
+  PRIMARY KEY (user_id, project_id, week)
 );
\ No newline at end of file