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app.py

@@ -10,7 +10,7 @@ DATABASE = os.path.join(os.path.dirname(__file__), "tasks.db")
 def get_db():
     db = getattr(g, "_database", None)
     if db is None:
-        db = g._database = sqlite3.connect(DATABASE)
+        db = g._database = sqlite3.connect(DATABASE, check_same_thread=False)
         db.row_factory = sqlite3.Row
     return db