Jaki jest najszybszy sposób wstawienia pandas DataFrame do systemu mongodb?PyMongo?

Próbowanie

db.myCollection.insert(df.to_dict())

dał błąd

InvalidDocument: documents must have only string keys, the key was Timestamp('2013-11-23 13:31:00', tz=None)

db.myCollection.insert(df.to_json())

dał błąd

TypeError: 'str' object does not support item assignment

db.myCollection.insert({id: df.to_json()})

dał błąd

InvalidDocument: documents must have only string a keys, key was <built-in function id>

df

<class 'pandas.core.frame.DataFrame'>
DatetimeIndex: 150 entries, 2013-11-23 13:31:26 to 2013-11-23 13:24:07
Data columns (total 3 columns):
amount    150  non-null values
price     150  non-null values
tid       150  non-null values
dtypes: float64(2), int64(1)