Drop unused  index
Drop unused  index

matrix-org/synapse,iot-factory/synapse,iot-factory/synapse,matrix-org/synapse,iot-factory/synapse,TribeMedia/synapse,iot-factory/synapse,matrix-org/synapse,iot-factory/synapse,matrix-org/synapse,matrix-org/synapse,TribeMedia/synapse,TribeMedia/synapse,TribeMedia/synapse,TribeMedia/synapse,matrix-org/synapse