diff --git a/backend/database.py b/backend/database.py
index 6cd887f..d1ede93 100644
--- a/backend/database.py
+++ b/backend/database.py
@@ -657,10 +657,8 @@ def _migrate(conn_factory):
         logger.info("Migration: dog_shares Tabelle bereit.")
 
         # Events: user_id NOT NULL Constraint entfernen (für Scheduler-Imports ohne User)
-        row = conn.execute(
-            "SELECT notnull FROM pragma_table_info('events') WHERE name='user_id'"
-        ).fetchone()
-        if row and row[0] == 1:
+        _ev_cols = {r[1]: r[3] for r in conn.execute("PRAGMA table_info(events)").fetchall()}
+        if _ev_cols.get("user_id") == 1:
             conn.executescript("""
                 CREATE TABLE IF NOT EXISTS events_new (
                     id          INTEGER PRIMARY KEY AUTOINCREMENT,