{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
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  "additionalProperties": false,
  "required": ["format", "version", "draft"],
  "properties": {
    "format": {"const": "TRAINLOG_AI_SESSION_DRAFT"},
    "version": {"const": 1},
    "draft": {"$ref": "#/$defs/draft"}
  },
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      "type": "object",
      "additionalProperties": false,
      "required": ["position", "exercise_id", "target_sets", "target_reps", "target_duration_seconds", "target_weight_kg", "rest_seconds"],
      "properties": {
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        "target_duration_seconds": {"type": ["integer", "null"], "minimum": 1, "maximum": 86400},
        "target_weight_kg": {"type": ["number", "null"], "exclusiveMinimum": 0, "maximum": 10000},
        "rest_seconds": {"type": "integer", "minimum": 0, "maximum": 86400}
      }
    },
    "draft": {
      "type": "object",
      "additionalProperties": false,
      "required": ["draft_id", "created_at", "planned_for", "session_type", "title", "notes", "entries"],
      "properties": {
        "draft_id": {"type": "string", "pattern": "^aid_[0-9a-f]{8}-[0-9a-f]{4}-4[0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$"},
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        "planned_for": {"type": ["string", "null"], "pattern": "^[0-9]{4}-[0-9]{2}-[0-9]{2}$"},
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        "notes": {"type": ["string", "null"], "minLength": 1, "maxLength": 2000},
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      }
    }
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}