{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "$id": "_schemas/fragments/edge.json",
  "title": "Edge input",
  "description": "Input mixin — one directed edge in a graph entity. Consumed by `link` / `rank` verbs in kei-entity-store.",
  "type": "object",
  "required": ["from", "to"],
  "properties": {
    "from": {
      "type": "integer",
      "minimum": 1,
      "description": "Source entity id"
    },
    "to": {
      "type": "integer",
      "minimum": 1,
      "description": "Target entity id"
    },
    "edge_type": {
      "type": "string",
      "default": "links",
      "description": "Semantic label for the edge (e.g. 'blocks', 'depends_on', 'links')"
    },
    "weight": {
      "type": "number",
      "minimum": 0,
      "description": "Optional edge weight (defaults to 1.0 if absent)"
    }
  }
}