{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://fluid.dev/schemas/event.schema.json",
  "title": "FLUID audit event",
  "description": "Append-only record of a material lifecycle transition. FLUID evolution is itself a system behavior that must remain reconstructable (FluidHypothesisRevisionSchema.md section 15).",
  "type": "object",
  "properties": {
    "fluid_event": {
      "type": "object",
      "properties": {
        "schema_version": { "$ref": "common.schema.json#/$defs/schemaVersion" },
        "id": { "$ref": "common.schema.json#/$defs/eventId" },
        "occurred_at": { "$ref": "common.schema.json#/$defs/timestamp" },
        "entity_type": { "enum": ["pressure", "hypothesis", "revision", "experiment", "backend_requirement", "intent", "decision", "routing_policy"] },
        "entity_id": { "type": "string", "minLength": 1 },
        "event_type": { "type": "string", "minLength": 1 },
        "actor": { "$ref": "common.schema.json#/$defs/actor" },
        "inputs": {
          "type": "array",
          "items": { "type": "string" },
          "description": "Identifiers of the records this transition drew on."
        },
        "reason": { "type": "string" },
        "evidence_refs": {
          "type": "array",
          "items": { "$ref": "common.schema.json#/$defs/evidenceRef" }
        }
      },
      "required": ["schema_version", "id", "occurred_at", "entity_type", "entity_id", "event_type", "actor"],
      "additionalProperties": false
    }
  },
  "required": ["fluid_event"],
  "additionalProperties": false
}