from_date is the last snapshot carryingto_date is the first snapshot carrying the NEW pair.{
"from_date": "2026-04-30",
"to_date": "2026-05-31",
"from_nav": 0,
"to_nav": 0,
"delta_shares": 0,
"net_flow_dollar_estimate": 0,
"from_nav_method": "string",
"to_nav_method": "string",
"from_shares_as_of": "string",
"to_shares_as_of": "string",
"from_aum_source": "string",
"to_aum_source": "string",
"basis_kind": "string",
"basis_note": "string",
"split_ratio_applied": 0,
"split_events_applied": [
{
"property1": "string",
"property2": "string"
}
],
"split_adjustment_reason": "string"
}