{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://docforge.local/schema/changeset-v1.json",
  "title": "DocForge isolated changeset",
  "type": "object",
  "required": ["schema_version", "changeset_id", "project_id", "root_fingerprint", "base_revision", "base_source_hash", "creator", "operations"],
  "properties": {
    "schema_version": { "const": 1 },
    "changeset_id": { "type": "string", "pattern": "^[a-z0-9][a-z0-9._-]{1,127}$" },
    "project_id": { "type": "string" },
    "root_fingerprint": { "type": "string", "pattern": "^[0-9a-f]{16}$" },
    "base_revision": { "type": "string", "minLength": 1 },
    "base_source_hash": { "type": "string", "pattern": "^[0-9a-f]{64}$" },
    "creator": { "type": "string", "minLength": 1 },
    "operations": {
      "type": "array",
      "maxItems": 10000,
      "items": {
        "type": "object",
        "required": ["sequence", "operation", "node_id", "expected_content_hash", "target_source", "metadata", "content", "relationship_changes", "rationale"],
        "properties": {
          "sequence": { "type": "integer", "minimum": 1 },
          "operation": { "enum": ["create", "update", "move", "delete"] },
          "node_id": { "type": "string", "pattern": "^[a-z0-9][a-z0-9._-]{1,127}$" },
          "expected_content_hash": { "type": ["string", "null"], "pattern": "^[0-9a-f]{64}$" },
          "target_source": { "type": ["string", "null"] },
          "metadata": { "type": ["object", "null"] },
          "content": { "type": ["string", "null"] },
          "relationship_changes": {
            "type": "array",
            "items": {
              "type": "object",
              "required": ["action", "source_id", "relation", "target_id"],
              "properties": {
                "action": { "enum": ["add", "remove"] },
                "source_id": { "type": "string", "pattern": "^[a-z0-9][a-z0-9._-]{1,127}$" },
                "relation": { "type": "string", "pattern": "^[a-z0-9][a-z0-9._-]{1,127}$" },
                "target_id": { "type": "string", "pattern": "^[a-z0-9][a-z0-9._-]{1,127}$" }
              },
              "additionalProperties": false
            }
          },
          "rationale": { "type": "string", "minLength": 1 }
        },
        "additionalProperties": false
      }
    }
  },
  "additionalProperties": false
}