'Loopback 4 total entries count if id is not an autogenerated value

I have a local database in .json format which is being filled by Loopback 4 backend. In this database i have a table with primary key in string:

 "User": {
      "0x3C44CdDdB6a900fa2b585dd299e03d12FA4293BC": "{\"ethAddress\":\"0x3C44CdDdB6a900fa2b585dd299e03d12FA4293BC\"}",
      "0x90F79bf6EB2c4f870365E785982E1f101E93b906": "{\"ethAddress\":\"0x90F79bf6EB2c4f870365E785982E1f101E93b906\"}"
    }

And the count of the entries counts strangely:

  "ids": {
    "User": 8.276165414890503e+47
  },

What happens? And also why is it always +1 if the primary key is auto generated number?



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