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Fills

GET /v1/account/{addr}/fills
Needs a session for the address in the path.
The account's fills, newest first, each from the account's own side.
query limitintegerdefault: 200
At most 500.
query beforeinteger
A fill's seq, to page backwards from it.
query envelope1
Wrap the answer as {"position", "fills"}.
[
  {
    "seq": 55120, "ts": 199990001234, "underlyingKey": 7, "specifier": 859008923130267914,
    "side": 1, "size": 10, "price": 20000, "fee": 20000, "role": "maker",
    "close": 0, "open": 10, "positionAfter": -10, "nonce": 42
  }
]
close and open split the fill into the part that closed an existing position and the part that opened a new one; positionAfter is the net position after it.