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instrument_token,exchange_token,tradingsymbol,name,last_price,expiry,strike,tick_size,lot_size,instrument_type,segment,exchange
8962818,35011,BANKNIFTY2112132000PE,"BANKNIFTY",0,2021-01-21,32000,0.05,25,PE,NFO-OPT,NFO
-- as observed till 21st Jan of 2021instrument_token,exchange_token,tradingsymbol,name,last_price,expiry,strike,tick_size,lot_size,instrument_type,segment,exchange
8962818,35011,BANKNIFTY2131028200PE,"BANKNIFTY",0,2021-03-10,28200,0.05,25,PE,NFO-OPT,NFO
-- as observed now in 1st week of Feb 2021
It is included in the docs as a note here.
@sujith
tradingsymbol:exchange
will be unique.