Remember that subgraph queries expect all letters within provided addresses to be in full lowercase.
Fetching all Flow Schedules for a certain sender
{
flowScheduleCreatedEvents(where: {sender: "0xbd5a76f59df49527e47df66d7d7b5590a237871d"}) {
id
order
sender
receiver
startAmount
startDate
startDateMaxDelay
superToken
flowRate
}
}
Note that that the id attribute is formatted as "{Event Name}-{Transaction Hash}-{Log Index}". Log index is provided as it's possible that multiple of the same event occur in the same transaction, so with the log index gives unique identification.