{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://ledgetoptechnologies.com/schemas/alphaledger/operational-ledger-record-v1.json",
  "type": "object",
  "additionalProperties": false,
  "required": ["event_id", "entity_type", "entity_id", "revision", "occurred_at", "operation", "data"],
  "properties": {
    "event_id": {"type": "string", "format": "uuid"},
    "entity_type": {"enum": ["employee", "project", "assignment", "time_entry", "break", "revision", "pay_accrual"]},
    "entity_id": {"type": "string", "minLength": 1, "maxLength": 128},
    "revision": {"type": "integer", "minimum": 1},
    "occurred_at": {"type": "string", "format": "date-time"},
    "operation": {"enum": ["upsert", "tombstone"]},
    "data": {"type": "object"}
  }
}