Maybe something along jepsen Tests or just a way to spawn multiple processes in parallel that interact with the same event store and test for consistency violations

JSON Schema

{
  "$schema": "https://json-schema.org/draft/2019-09/schema",
  "$ref": "#/$defs/AppendCondition",
  "$defs": {
    "AppendCondition": {
      "type": "object",
      "additionalProperties": false,
      "properties": {
        "query": {
          "$ref": "#/$defs/StreamQuery"
        },
        "expected_highest_sequence_number": {
          "oneOf": [
            {
              "const": "NONE"
            },
            {
              "const": "ANY"
            },
            {
              "$ref": "#/$defs/SequenceNumber"
            }
          ]
        }
      },
      "required": [
        "query",
        "expected_highest_sequence_number"
      ]
    },
    "StreamQuery": {
      "type": "object",
      "additionalProperties": false,
      "properties": {
        "version": {
          "type": "string",
          "pattern": "^\\d+\\.\\d+$"
        },
        "criterias": {
          "type": "array",
          "items": {
            "$ref": "#/$defs/StreamQueryCriteria"
          }
        }
      },
      "required": [
        "version",
        "criterias"
      ]
    },
    "StreamQueryCriteria": {
      "type": "object",
      "additionalProperties": false,
      "properties": {
        "type": {
          "type": "string",
          "enum": [
            "EventTypesAndTags",
            "EventTypes",
            "Tags"
          ]
        },
        "properties": {
          "type": "object",
          "additionalProperties": false,
          "properties": {
            "tags": {
              "type": "array",
              "items": {
                "$ref": "#/$defs/Tag"
              }
            },
            "event_types": {
              "type": "array",
              "items": {
                "$ref": "#/$defs/EventType"
              }
            }
          },
          "required": [
            "tags",
            "event_types"
          ]
        }
      },
      "required": [
        "type",
        "criteria"
      ]
    },
    "EventEnvelope": {
      "type": "object",
      "additionalProperties": false,
      "properties": {
        "event": {
          "$ref": "#/$defs/Event"
        },
        "sequence_number": {
          "$ref": "#/$defs/SequenceNumber"
        }
      },
      "required": [
        "event",
        "sequence_number"
      ]
    },
    "Event": {
      "type": "object",
      "additionalProperties": false,
      "properties": {
        "id": {
          "$ref": "#/$defs/EventId"
        },
        "type": {
          "$ref": "#/$defs/EventType"
        },
        "data": {
          "$ref": "#/$defs/EventData"
        },
        "tags": {
          "type": "array",
          "items": {
            "$ref": "#/$defs/Tag"
          }
        }
      },
      "required": [
        "id",
        "type",
        "data",
        "tags"
      ]
    },
    "EventId": {
      "type": "string",
      "pattern": "^[\\w\\-]+$",
      "minLength": 1,
      "maxLength": 100
    },
    "EventType": {
      "type": "string",
      "pattern": "^[\\w\\.\\:\\-]+$",
      "minLength": 1,
      "maxLength": 200
    },
    "EventData": {
      "type": "string"
    },
    "Tag": {
      "type": "object",
      "additionalProperties": false,
      "properties": {
        "key": {
          "type": "string",
          "minLength": 1,
          "maxLength": 50,
          "pattern": "^[A-Za-z0-9\\-\\_]+$"
        },
        "value": {
          "minLength": 1,
          "maxLength": 50,
          "type": "string",
          "pattern": "^[A-Za-z0-9\\-\\_]+$"
        }
      },
      "required": [
        "key",
        "value"
      ]
    },
    "SequenceNumber": {
      "type": "integer",
      "minimum": 1
    }
  }
}

DomainIds should be able to contain multiple (different) values for the same key

DomainIds are currently serialized as JSON object in the form:

{"key1": "some-value", "key": "some-value"}

Instead it should be stored as an array like:

[{"key1": "some-value"}, {...}]

Validation has to be adjusted accordingly.

use case

To ensure usernames are unique, events could look like:

[{
  "type": "UsernameClaimed",
  "data": {"username": "some-username"}
  "domainIds": [{"username": "some-username"}]
}, {
  "type": "UsernameChanged",
  "data": {"newUsername": "some-new-username"}
  "domainIds": [{"username": "some-username"}, {"username": "some-new-username"}]
},

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