{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://basicstack.de/schemas/sink/db/expense/v1.1.0.json",
  "title": "Sink Payload: sink:expense-db-app, action expense.post v1.1.0",
  "description": "Senken-Payload für die eigene DB-App mit Zeilen-Allokationen. Agent-sink-mapping löst alle percentage-Modi aus expense.canonical v1.1.0 in absolute Beträge auf; die Senke erhält ausschließlich absolute amounts. Jedes Item trägt sein eigenes allocations[]-Array (Pflicht, mindestens 1 Entry). Die DB-App persistiert diese als expense_item_allocations-Zeilen (siehe docs/architecture/v1.1.md Abschnitt 7.2).",
  "type": "object",
  "additionalProperties": false,
  "required": ["schema", "workflow_id", "approval_id", "decision_id", "verification_ref", "canonical_payload_hash", "expense"],
  "properties": {
    "schema": {
      "type": "object",
      "additionalProperties": false,
      "required": ["name", "version"],
      "properties": {
        "name":    { "const": "sink.db.expense" },
        "version": { "const": "1.1.0" }
      }
    },
    "workflow_id":    { "type": "string", "pattern": "^WF-[0-9]{4}-[0-9]{4,}$" },
    "approval_id":    { "type": "string", "pattern": "^APR-[0-9]{4}-[0-9]{4,}$" },
    "decision_id":    { "type": "string", "pattern": "^DEC-[0-9]{4}-[0-9]{4,}$" },
    "verification_ref":       { "type": "string", "pattern": "^sha256:[0-9a-f]{64}$" },
    "canonical_payload_hash": { "type": "string", "pattern": "^sha256:[0-9a-f]{64}$" },
    "expense": {
      "type": "object",
      "additionalProperties": false,
      "required": ["employee_id", "currency", "total_amount", "trip", "items"],
      "properties": {
        "employee_id":  { "type": "string", "pattern": "^EMP-[0-9]+$" },
        "currency":     { "type": "string", "pattern": "^[A-Z]{3}$" },
        "total_amount": { "type": "string", "pattern": "^-?[0-9]+\\.[0-9]{2}$" },
        "trip": {
          "type": "object",
          "additionalProperties": false,
          "required": ["start_date", "end_date", "destination"],
          "properties": {
            "start_date":  { "type": "string", "format": "date" },
            "end_date":    { "type": "string", "format": "date" },
            "destination": { "type": "string", "maxLength": 200 },
            "purpose":     { "type": "string", "maxLength": 500 }
          }
        },
        "items": {
          "type": "array",
          "minItems": 1,
          "maxItems": 200,
          "items": {
            "type": "object",
            "additionalProperties": false,
            "required": ["type", "amount", "incurred_on", "allocations"],
            "properties": {
              "type": {
                "type": "string",
                "enum": ["HOTEL", "MEALS", "TRANSPORT_FLIGHT", "TRANSPORT_RAIL", "TRANSPORT_CAR", "PARKING", "COMMUNICATION", "CONFERENCE_FEE", "OTHER"]
              },
              "amount":      { "type": "string", "pattern": "^-?[0-9]+\\.[0-9]{2}$" },
              "incurred_on": { "type": "string", "format": "date" },
              "description": { "type": "string", "maxLength": 500 },
              "receipt_ref": { "type": "string", "pattern": "^pii://[A-Za-z0-9/._-]+$" },
              "allocations": {
                "description": "Immer gesetzt in der Senken-Fassung. Mindestens 1 Entry. Alle amounts sind absolut (percentage ist informativ, falls bekannt). Summe aller amount == item.amount.",
                "type": "array",
                "minItems": 1,
                "maxItems": 50,
                "items": {
                  "type": "object",
                  "additionalProperties": false,
                  "required": ["project_code", "cost_center", "gl_account", "amount", "source_attestation_ref"],
                  "properties": {
                    "project_code": { "type": "string", "pattern": "^P-[0-9]+$" },
                    "cost_center":  { "type": "string", "pattern": "^CC-[0-9]+$" },
                    "gl_account":   { "type": "string", "pattern": "^[0-9]{4,6}$" },
                    "amount":       { "type": "string", "pattern": "^-?[0-9]+\\.[0-9]{2}$" },
                    "percentage":   {
                      "type": "string",
                      "pattern": "^(100\\.00|[0-9]{1,2}\\.[0-9]{2})$",
                      "description": "Optional. Nur gesetzt, wenn canonical mode=percentage war — als Herkunftsnachweis."
                    },
                    "source_attestation_ref": {
                      "type": "string",
                      "pattern": "^sha256:[0-9a-f]{64}$"
                    }
                  }
                }
              }
            }
          }
        }
      }
    }
  }
}